Name: 1.5SMC16A
Brand: Bourns Inc.
SKU: 1-5SMC16A_94
Availability: InStock
Rating: 5 (179 reviews)

1.5SMC16A

僅供參考

零件編號	1.5SMC16A
製造商	Bourns Inc.
描述	TVS DIODE 13.6VWM 22.5VC DO214AB
數據表	1.5SMC16A 數據表
封裝	DO-214AB, SMC
ECAD
庫存	17,112 piece(s)
單價	Request a Quote
交貨期	可立即發貨
預計送達時間	四月 30 - 五月 5 (選擇速遞服務)
請求報價

支付方式
送貨服務

我們提供的 1.5SMC16A 具有全球市場競爭力的價格，如有需要請發送詢價單給我們。謝謝！
添加 1.5SMC16A 及其數量至BOM以便提交您的報價請求。 Heisener.com 無需註冊便可以提交 1.5SMC16A 的報價請求。

1.5SMC16A參數

製造商	Bourns Inc.
類別	電路保護 - TVS - 二極體
封裝	DO-214AB, SMC
ECAD
系列	-
類型	Zener
單向通道	1
雙向通道	-
電壓 - 反向支座（典型值）	13.6V
電壓 - 擊穿（最小）	15.2V
電壓 - 箝位（最大值）@ Ipp	22.5V
電流 - 峰值脈衝（10 /1000μs）	67.6A
功率 - 峰值脈衝	1500W (1.5kW)
電力線保護	No
應用	General Purpose
電容@頻率	-
工作溫度	-55°C ~ 150°C (TJ)
安裝類型	Surface Mount
包/箱	DO-214AB, SMC
供應商設備包	DO-214AB, (SMC)

1.5SMC16A數據表

1.5SMC16A Packaging

1.5SMC16A FAQ

1. How to order 1.5SMC16A on Heisener?

Currently, Heisener only provide peer-to-peer order processing. While you submit the RFQ, our professional agent will contact you with the competitive prices in the global market, and our agent will prompt you to finish the order if you accept our offers.
2. How does Heisener guarantee that 1.5SMC16A is from the original manufacturer or authorized agents?

We have a professional and experienced quality control team to strictly verify and test the 1.5SMC16A. All suppliers must pass our qualification reviews before they can publish their products including 1.5SMC16A on Heisener; we pay more attention to the channels and quality of 1.5SMC16A products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
3. Are the 1.5SMC16A price and inventory displayed accurate?

The price and inventory of 1.5SMC16A fluctuates frequently and cannot be updated in time, it will be updated periodically within 24 hours. And, our quotation usually expires after 5 days.
4. What forms of payment are accepted?

Wire Transfer, PayPal, Alipay, Wechat, Credit Card, Western Union, MoneyGram, and Escrow are all acceptable.

Warm Tips: Some orders in certain payment forms may require handling fee.
5. How is the shipping arranged?

Customers can choose industry-leading freight companies, including DHL, UPS, FedEx, TNT, and Registered Mail. Shipping insurance is also available.

Once your order has been processed for shipment, our salesperson will send you an email advising you of the shipping status and tracking number.

Warm Tips: It may take up to 24 hours for the carriers to display tracking information. Usually, express delivery takes 3-5 days, and registered mail takes 25-60 days.
6. What is the process for return or replacement of 1.5SMC16A?

All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the 1.5SMC16A we delivered, we will accept the replacement or return of the 1.5SMC16A only when all of the below conditions are fulfilled:

(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.

(2)We are informed of the defect described above within 90 days after the delivery of 1.5SMC16A.

(3)The PartNo is unused and only in the original unpacked packaging.

Two processes to return the products:

(1)Inform us within 90 days

(2)Obtain Requesting Return Authorizations
7.How to contact us to get technical supports, such as 1.5SMC16A pin diagram, 1.5SMC16A datasheet?

If you need any after-sales service, please do not hesitate to contact us.

1.5SMC16A相關產品

SIT8008AIF12-XXE-40.000000D	SiTIME, OSC MEMS 40.0000MHZ LVCMOS SMD, 4-SMD, No Lead, -	查看
MKT1820618165	Vishay BC Components, CAP FILM 18UF 10% 160VDC RADIAL, Radial, -	查看
1825Y6K00271JCR	Knowles Syfer, CAP CER 1825, 1825 (4564 Metric), -	查看
DS90LV048ATMTCX/DRPB	Texas Instruments, IC LINE RCVR QUAD CMOS 16-TSSOP, 16-TSSOP (0.173", 4.40mm Width), -	查看
XQDAWT-02-0000-00000HDF8	Cree Inc., LED XLAMP WARM WHITE 2850K 2SMD, 0606 (1616 Metric), -	查看
AT4146-003	NKK Switches, SW KEY TUBULAR HIGH SECURITY #03, -, -	查看
RG2012P-7870-D-T5	Susumu, RES SMD 787 OHM 0.5% 1/8W 0805, 0805 (2012 Metric), -	查看
SC1704-6R8	Signal Transformer, FIXED IND 6.8UH 880MA 320 MOHM, Nonstandard, -	查看
OSTV7027251	On Shore Technology Inc., TERM BLOCK HDR 2POS 90DEG 5MM, -, -	查看
ESQ-108-24-T-D-LL	Samtec Inc., ELEVATED SOCKET STRIPS, -, -	查看
M83723/77R20419	TE Connectivity Deutsch Connectors, CONN PLUG 41POS STRGHT W/SKT, -, -	查看
V72C24E150BF	Vicor Corporation, CONVERTER MOD DC/DC 24V 150W, Quarter Brick, -	查看

1.5SMC16A 保證

服務保證

我們保證100％的客戶滿意度。

我們經驗豐富的銷售團隊和技術支持團隊支持我們的服務以滿足所有客戶。

質量保證

我們提供90天保修。

如果您收到的物品質量不合格，我們將負責您的退款或更換，但物品必須以原始狀態退回。

全球供應鏈-可靠的授權分銷商資源

零件編號	製造商	描述	庫存
1.5SMC16A-E3/57T D# V72:2272_18784924	Vishay Intertechnologies	TVS Diode Single Uni-Dir 13.6V 1.5KW 2-Pin SMC T/R	0
1.5SMC16A-Q D# V72:2272_23679700	Bourns Inc	TVS Diode Single Uni-Dir 13.6V 1.5KW Automotive 2-Pin SMC T/R	0
1.5SMC16A-E3/9AT D# V36:1790_09208717	Vishay Intertechnologies	TVS Diode Single Uni-Dir 13.6V 1.5KW 2-Pin SMC T/R	0
1.5SMC16A D# V72:2272_14673098	Bourns Inc	TVS Diode Single Uni-Dir 13.6V 1.5KW 2-Pin SMC T/R	0
SZ1.5SMC16AT3G D# V36:1790_07311311	Littelfuse Inc	TVS Diode Single Uni-Dir 13.6V 1.5KW Automotive 2-Pin SMC T/R	0

零件編號	製造商	描述	庫存
1.5SMC16A TR13 PBFREE D# 1.5SMC16A TR13 PBFREE	Central Semiconductor Corp	Diode TVS Single Uni-Dir 13.6V 1.5KW 2-Pin SMC T/R - Tape and Reel (Alt: 1.5SMC16A TR13 PBFREE) RoHS: Compliant	0
SZ1.5SMC16AT3G D# SZ1.5SMC16AT3G	ON Semiconductor	Diode TVS Single Uni-Dir 13.6V 1.5KW 2-Pin SMC T/R - Bulk (Alt: SZ1.5SMC16AT3G) RoHS: Compliant	0
1.5SMC16A D# 1.5SMC16A	Bourns Inc	Diode TVS Single Uni-Dir 13.6V 1500W 2-Pin DO-214AB T/R - Tape and Reel (Alt: 1.5SMC16A) RoHS: Not Compliant	0
1.5SMC16A-E3/57T D# 1.5SMC16A-E3/57T	Vishay Intertechnologies	Diode TVS Single Uni-Dir 13.6V 1.5KW 2-Pin SMC T/R - Tape and Reel (Alt: 1.5SMC16A-E3/57T) RoHS: Compliant	0
1.5SMC16A V7G D# 1.5SMC16A V7G	Taiwan Semiconductor	Diode TVS Single Uni-Directional 12.9V 1500W 2-Pin DO-214AB T/R - Tape and Reel (Alt: 1.5SMC16A V7G) RoHS: Compliant	0
1.5SMC16A-E3/9AT D# 1.5SMC16A-E3/9AT	Vishay Intertechnologies	Diode TVS Single Uni-Dir 13.6V 1.5KW 2-Pin SMC T/R - Tape and Reel (Alt: 1.5SMC16A-E3/9AT) RoHS: Compliant	0
1.5SMC16A-AT/TR13 D# 1.5SMC16A-AT/13	YAGEO Corporation	Transient Voltage Suppressor Uni-Directional 13.6V 1.5kW 2-Pin DO-214AB T/R - Tape and Reel (Alt: 1.5SMC16A-AT/13) RoHS: Not Compliant	0
1.5SMC16A/TR13 D# 1.5SMC16A/TR13	YAGEO Corporation	Transient Voltage Suppressor Uni-Directional 13.6V 1.5kW 2-Pin DO-214AB T/R - Tape and Reel (Alt: 1.5SMC16A/TR13) RoHS: Not Compliant	0
1.5SMC16AHV6G D# 1.5SMC16AHV6G	Taiwan Semiconductor	Diode TVS Single Uni-Directional 12.9V 1500W 2-Pin DO-214AB T/R - Tape and Reel (Alt: 1.5SMC16AHV6G) RoHS: Compliant	0
1.5SMC16A-Q D# 1.5SMC16A-Q	Bourns Inc	Diode TVS Uni-Directional 16V 1500W 2-Pin DO-214AB Automotive T/R - Tape and Reel (Alt: 1.5SMC16A-Q) RoHS: Compliant	0
1.5SMC16AHE3_A/I D# 1.5SMC16AHE3_A/I	Vishay Intertechnologies	TRANSZORB Transient Voltage Suppressor Uni-Directional 16V 1.5kW Automotive 2-Pin DO-214AB T/R (Alt: 1.5SMC16AHE3_A/I) RoHS: Not Compliant	0
1.5SMC16A/TR7 D# 1.5SMC16A/TR7	YAGEO Corporation	Transient Voltage Suppressor Uni-Directional 13.6V 1.5kW 2-Pin DO-214AB T/R - Tape and Reel (Alt: 1.5SMC16A/TR7) RoHS: Not Compliant	0
1.5SMC16A V6G D# 1.5SMC16A V6G	Taiwan Semiconductor	Diode TVS Single Uni-Directional 12.9V 1500W 2-Pin DO-214AB T/R - Tape and Reel (Alt: 1.5SMC16A V6G) RoHS: Compliant	0
1.5SMC16A TR13 D# 1.5SMC16A TR13	Central Semiconductor Corp	Silicon Transient Voltage Suppressor Glass Passivated Junction Single Uni-Directional 16V 1500W 2-Pin SMC Surface Mount T/R - Tape and Reel (Alt: 1.5SMC16A TR13) RoHS: Not Compliant	0

零件編號	製造商	描述	庫存
1.5SMC16A D# 1.5SMC16A	Bourns Inc	Diode TVS Single Uni-Dir 13.6V 1500W 2-Pin DO-214AB T/R (Alt: 1.5SMC16A) RoHS: Compliant	0
1.5SMC16AT/R7 D# 1.5SMC16A_R3_00001	PanJit Semiconductor	Diode TVS Single Uni-Dir 13.6V 1.5KW 2-Pin SMC T/R (Alt: 1.5SMC16A_R3_00001) RoHS: Compliant	0
1.5SMC16A-Q D# 1.5SMC16A-Q	Bourns Inc	Diode TVS Uni-Directional 16V 1500W 2-Pin DO-214AB Automotive T/R (Alt: 1.5SMC16A-Q) RoHS: Compliant	0
1.5SMC16AT/R13 D# 1.5SMC16A_R2_00001	PanJit Semiconductor	Diode TVS Single Uni-Dir 13.6V 1.5KW 2-Pin SMC T/R (Alt: 1.5SMC16A_R2_00001) RoHS: Compliant	0

零件編號

製造商

描述

庫存

1.5SMC16AT3G

ON Semiconductor

零件編號	製造商	描述	庫存
1.5SMC16AT3G	ON Semiconductor	TVS DIODE 13.6VWM 22.5VC SMC	2500
1.5SMC16AHE3/57T	Vishay Intertechnologies	TVS Diodes - Transient Voltage Suppressors 1500W 16V 5% Unidir	703
SZ1.5SMC16AT3G	ON Semiconductor	ZEN SMC TVS 1.5KW 16V TR - Tape and Reel	0
1.5SMC16A-E3/9AT	Vishay Semiconductors	TVS SGL UNI-DIR 13.6V 1.5KW 2PIN SMC - Tape and Reel	0
1.5SMC16A-E3/57T	Vishay Semiconductors	TVS SGL UNI-DIR 13.6V 1.5KW 2PIN SMC - Tape and Reel	0
1.5SMC16AHE3/9AT	Vishay Intertechnologies	TVS Diodes - Transient Voltage Suppressors 1500W 16V 5% Unidir	0
1.5SMC16A	Vishay Semiconductors	TVS SGL UNI-DIR 13.6V 1.5KW 2PIN SMC - Tape and Reel	0

零件編號

製造商

描述

庫存

1.5SMC16AT3G

Littelfuse Inc

1500 Watt Peak Power Zener Transient Voltage Suppressors

113

零件編號	製造商	描述	庫存
1.5SMC16A V6G D# 1.5SMC16AV6G-ND	Taiwan Semiconductor Manufacturing Company Limited	TVS DIODE 13.6V 22.5V DO214AB	0
1.5SMC16AT3G D# 1.5SMC16AT3GOSTR-ND	Littelfuse Inc	TVS DIODE 13.6V 22.5V SMC	0
1.5SMC16AHE3/57T D# 1.5SMC16AHE3/57T-ND	Vishay Semiconductors	TVS DIODE 13.6V 22.5V DO214AB	0
1.5SMC16A-E3/57T D# 1.5SMC16A-E3/57TGICT-ND	Vishay Semiconductors	TVS DIODE 13.6V 22.5V DO214AB	1377
1.5SMC16A TR13 PBFREE D# 1514-1.5SMC16ATR13PBFREETR-ND	Central Semiconductor Corp	TVS DIODE 13.6V 22.5VC SMC	0
SZ1.5SMC16AT3G D# F11487CT-ND	Littelfuse Inc	TVS DIODE 13.6V 22.5V SMC	29115
1.5SMC16A V7G D# 1.5SMC16AV7G-ND	Taiwan Semiconductor Manufacturing Company Limited	TVS DIODE 13.6V 22.5V DO214AB	0
1.5SMC16AHE3/9AT D# 1.5SMC16AHE3/9AT-ND	Vishay Semiconductors	TVS DIODE 13.6V 22.5V DO214AB	0
1.5SMC16A D# 1.5SMC16ACT-ND	Littelfuse Inc	TVS DIODE 13.6V 22.5V DO214AB	21359
1.5SMC16A-E3/9AT D# 1.5SMC16A-E3/9AT-ND	Vishay Semiconductors	TVS DIODE 13.6V 22.5V DO214AB	0

零件編號

製造商

描述

庫存

1.5SMC16A

D# 2535735RL

Bourns Inc

TVS DIODE, 1.5KW, 13.6V, UNIDIR, DO214AB

RoHS: Compliant

Min Qty: 1

Container: Reel

1.5SMC16AHM3_A/H

D# 3528835

Vishay Intertechnologies

TVS, UNIDIRECTIONAL, 16V, 1.5KW SMC

RoHS: Not Compliant

Min Qty: 3400

Container: Reel

零件編號	製造商	描述	庫存
1.5SMC16A	Littelfuse Inc	TVS 1.5KW 16V 5%UNI DO-214AB TR13 RoHS RoHS: Compliant pbFree: Yes	0
1.5SMC16AHV6G	Taiwan Semiconductor	RoHS: Compliant pbFree: Yes	0
1.5SMC16A V6G	Taiwan Semiconductor	RoHS: Compliant pbFree: Yes	0

零件編號

製造商

描述

庫存

1.5SMC16A-Q

Bourns Inc

TVS Diode - Breakdown Voltage 16V - 1500W - Unidirectional - SMC - AEC-Q101 Compliant

RoHS: Compliant

零件編號	製造商	描述	庫存
1.5SMC16A-E3/57T D# 625-1.5SMC16A-E3	Vishay Intertechnologies	ESD Suppressors / TVS Diodes 1500W 16V Unidirect RoHS: Compliant	2955
1.5SMC16A-H D# 652-1.5SMC16A-H	Bourns Inc	ESD Suppressors / TVS Diodes 16V 1500W UniDir RoHS: Compliant	1250
1.5SMC16A D# 652-1.5SMC16A	Bourns Inc	ESD Suppressors / TVS Diodes 16V 1500W UniDir RoHS: Compliant	13927
SZ1.5SMC16AT3G D# 863-SZ1.5SMC16AT3G	Littelfuse Inc	ESD Suppressors / TVS Diodes 16V 1.5kW UNI-DIR SZ1.5SMC AEC-Q101 RoHS: Compliant	3638

零件編號	製造商	描述	庫存
1.5SMC16AS_R1	PanJit Semiconductor	SURFACE MOUNT TRANSIENT VOLTAGE SUPPRESSOR POWER 400 Watt - 13IN. REEL. Package Type: SMA RoHS: Compliant	0
1.5SMC16A_R2	PanJit Semiconductor	Transient Voltage Suppressor - 7IN. REEL. Package Type: SMC RoHS: Compliant	0
1.5SMC16A_R1	PanJit Semiconductor	SURFACE MOUNT TRANSIENT VOLTAGE SUPPRESSOR POWER 400 Watt - 13IN. REEL. Package Type: SMA RoHS: Compliant	0
1.5SMC16AS_R2	PanJit Semiconductor	GLASS PASSIVATED JUNCTION TRANSIENT VOLTAGE SUPPRESSOR PEAK PULSE POWER 1500 Watt - 7IN. REEL. Package Type: SMC RoHS: Compliant	0

零件編號	製造商	描述	庫存
1.5SMC16AS_R1 D# PJT000000007744	PanJit Semiconductor	SURFACE MOUNT TRANSIENT VOLTAGE SUPPRESSOR POWER 400 Watt - 13IN. REEL. Package Type: SMA	0
1.5SMC16A_R2 D# PJT000000003265	PanJit Semiconductor	Transient Voltage Suppressor - 7IN. REEL. Package Type: SMC	0
1.5SMC16A_R1 D# PJT000000007745	PanJit Semiconductor	SURFACE MOUNT TRANSIENT VOLTAGE SUPPRESSOR POWER 400 Watt - 13IN. REEL. Package Type: SMA	0
1.5SMC16AS_R2 D# PJT000000003264	PanJit Semiconductor	GLASS PASSIVATED JUNCTION TRANSIENT VOLTAGE SUPPRESSOR PEAK PULSE POWER 1500 Watt - 7IN. REEL. Package Type: SMC	0
1.5SMC16A D# XSRC00000001397	Littelfuse Inc	TVS DIODE 13.6V 22.5V	250

零件編號	製造商	描述	庫存
SZ1.5SMC16AT3G D# 34AC6299	Littelfuse Inc	Zen TVS 1500W 16V VZ UNI DO-214AB TR13 / BOX RoHS Compliant: Yes RoHS: Compliant Min Qty: 2500 Container: Bulk	0
1.5SMC16A D# 71J2652	Littelfuse Inc	TRANSIENT SUPPRESSOR DIODE,SINGLE,UNIDIRECTIONAL,13.6V V(RWM),DO-214AB / SMC RoHS: Not Compliant Min Qty: 3000 Container: TAPE & REEL - FULL	0
1.5SMC16A-E3/57T D# 38AH3657	Vishay Intertechnologies	1.5KW,16V 5%,UNIDIR,SMC TVS ROHS COMPLIANT: YES RoHS: Compliant Min Qty: 850 Container: TAPE & REEL - FULL	29750
1.5SMC16A-Q D# 33AH6512	Bourns Inc	DIO TVS VBR 16V 1500W UNIDIR SMC AEC-Q RoHS: Not Compliant Min Qty: 12000 Container: Bulk	0

零件編號	製造商	描述	庫存
1.5SMC16AHE3/57T D# NS-1.5SMC16AHE3/57T	Vishay Semiconductors	OEM/CM ONLY	2567
1.5SMC16A-E3/57T D# NS-1.5SMC16A-E3/57T	Vishay Semiconductors	OEM/CM ONLY	6161
1.5SMC16A-E3/9AT D# NS-1.5SMC16A-E3/9AT	Vishay Semiconductors	OEM/CM ONLY	1169
1.5SMC16AHE3/9AT D# NS-1.5SMC16AHE3/9AT	Vishay Semiconductors	OEM/CM ONLY	9676
1.5SMC16AT3G D# NS-1.5SMC16AT3G	ON Semiconductor	OEM/CM ONLY	4188

零件編號

製造商

描述

庫存

1.5SMC16A-Q

Bourns Inc

TVS Diode - Breakdown Voltage 16V - 1500W - Unidirectional - SMC - AEC-Q101 Compliant

RoHS: Compliant

零件編號

製造商

描述

庫存

1.5SMC16AT3G

ON Semiconductor

1500 W, UNIDIRECTIONAL, SILICON, TVS DIODE

零件編號

製造商

描述

庫存

1.5SMC16A

D# 1261755

Bourns Inc

Bourns 1.5SMC16A, Uni-Directional TVS Diode, 1500W, 2-Pin DO214AB, PK

Min Qty: 25

Container: Package

8050

零件編號

製造商

描述

庫存

SZ1.5SMC16AT3G

ON Semiconductor

Trans Voltage Suppressor Diode

RoHS: Compliant

2228

零件編號	製造商	描述	庫存
1.5SMC16A	Vishay Intertechnologies	OEM/CM ONLY	266
SZ1.5SMC16AT3G	ON Semiconductor	OEM/CM ONLY	2516
1.5SMC16AE3/57T	Vishay Semiconductors	OEM/CM ONLY	17016
1.5SMC16AT3	ON Semiconductor	OEM/CM ONLY	2215
15SMC16A1.5SMCJ16A		OEM/CM ONLY	3016
1.5SMC16AT3G	ON Semiconductor	OEM/CM ONLY	106

零件編號	製造商	描述	庫存
1.5SMC16A-Q	Bourns Inc	ESD Suppressors / TVS Diodes TVS 1.5KW pbFree: Pb-Free	0
1.5SMC16A-E3/57T	Vishay Intertechnologies	ESD Suppressors / TVS Diodes 1500W 16V Unidirect pbFree: Pb-Free	0
1.5SMC16A-E3/9AT	Vishay Intertechnologies	ESD Suppressors / TVS Diodes 1500W 16V Unidirect pbFree: Pb-Free	0
1.5SMC16A	Littelfuse Inc	ESD Suppressors / TVS Diodes 1.5kW 16V 5% Uni-Directional	0

零件編號

製造商

描述

庫存

1.5SMC16A

D# 25808497

Bourns Inc

TVS Diode Single Uni-Dir 13.6V 1.5KW 2-Pin SMC T/R

零件編號

製造商

描述

庫存

1.5SMC16AT3

ON Semiconductor

RFQ

3062

零件編號

製造商

描述

庫存

1.5SMC16A

D# 2535735

Bourns Inc

TVS DIODE, 1.5KW, 13.6V, UNIDIR, DO214AB

RoHS: Compliant

Min Qty: 1

Container: Cut Tape

6668

Quick Inquiry

1.5SMC16A

質量認證

黑森爾對質量的承諾，塑造了我們的採購、測試、運輸流程以及它們之間的每一步。這個基準是我們所銷售的每一個元器件的基礎。

ISO9001:2015, ICAS, IAF, UKAS

查看證書

聯繫我們

您有關於 1.5SMC16A 的問題嗎？

Telephone
86-755-83210559-819
E-mail
SalesDept@heisener.com
Skype
sa20@heisener.com
QQ
2853867184
WeChat
WhatsApp
Message
发送信息

掃描以查看此頁面

1.5SMC16A

1.5SMC16A參數

1.5SMC16A數據表

1.5SMC16A Packaging

1.5SMC16A FAQ

1.5SMC16A相關產品

1.5SMC16A 保證

服務保證

質量保證

全球供應鏈-可靠的授權分銷商資源

Quick Inquiry

質量認證

聯繫我們

推薦產品

1.5SMC16A Tags

1.5SMC16A可用於