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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Taiwan Semiconductor Corporation 1SMA4763H

Name: 1SMA4763H
Brand: Taiwan Semiconductor Corporation
SKU: 1SMA4763H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1SMA4763H

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Zener Diodes

Package:: DO-214AC, SMA

Datasheet:: 1SMA4763H.pdf

Description:: DIODE ZENER 91V 1.25W DO214AC

Quantity:: RFQ Add To RFQ list

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Inventory:4,711

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Product details

Overview

1SMA4763H from Taiwan Semiconductor is a surface-mount 1 W Zener diode with nominal zener voltage 91 V, test current 2.8 mA, dynamic impedance 250 Ω at IZT, leakage current ≤0.25 µA at 69.2 V, and surge current rating 50 A. It is used for overvoltage protection and voltage regulation in power supply rails and automotive ECU input conditioning.

For engineers reviewing the 1SMA4763H datasheet, 1SMA4763H pinout, 1SMA4763H application, or 1SMA4763H equivalent, key selection criteria include zener voltage tolerance (±5%), DO-214AC package thermal performance, low-inductance construction, AEC-Q101 qualification, and verified surge robustness up to 60 W non-repetitive peak power.

Technical Context

The 1SMA4763H employs a glass-passivated silicon junction optimized for stable reverse breakdown under transient stress. Its 91 V nominal zener voltage places it in the high-voltage regulation range where temperature coefficient is positive and typically +6.5 mV/°C per manufacturer curves (Fig.8).

Designed for automated SMT assembly, the device features matte tin-plated leads compliant with J-STD-002, moisture sensitivity level 1, and UL 94V-0 molding compound. Junction temperature range spans −55 °C to +175 °C, supporting under-hood automotive environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener voltage V_Z	91 V ±5% - defines precise clamping threshold for 69.2–95.6 V operating window
Test current I_ZT	2.8 mA - standard bias point for measuring V_Z and dynamic impedance
Zener impedance Z_ZT	250 Ω @ I_ZT - determines regulation stiffness and AC ripple suppression capability
Power dissipation P_D	1 W @ T_A = 25 °C - sets continuous DC power limit on standard PCB copper pad
Leakage current I_R	≤0.25 µA @ 69.2 V - ensures minimal standby power loss below clamping threshold
Surge current I_FSM	50 A @ 8.3 ms half-sine - supports transient immunity per ISO 7637-2 Pulse 1/2/5a
Junction temperature T_J	−55 °C to +175 °C - enables operation in engine control units and industrial power converters

Pinout & Package

Package: DO-214AC (SMA), surface-mount, single-anode/cathode configuration with cathode band marking. Weight: 0.060 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / reference ground node	Connected to lower-potential side of regulated rail; establishes forward voltage drop (~0.8 V) during conduction
Cathode	Zener breakdown terminal / clamping output node	Connected to protected circuit node; conducts reverse current above 91 V to clamp transients

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive electronics use including engine management and ADAS sensor interfaces
Glass passivated junction	Enhances long-term reliability and stability of V_Z under thermal cycling and humidity exposure
Low inductance construction	Minimizes voltage overshoot during fast transients (e.g., load dump), improving clamping fidelity
Moisture sensitivity level 1	Eliminates need for baking prior to reflow, reducing manufacturing cost and process complexity
RoHS and halogen-free	Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally constrained applications

Applications

Automotive Power Rail Protection	Industrial DC-DC Converter Feedback
Use Scenario: Clamping induced transients on 12 V/24 V battery-fed ECUs during load dump or jump-start events. IC Role / Device Role / Timing Role: Standalone voltage clamp protecting downstream LDOs, microcontrollers, and CAN transceivers. Use Value: Withstands 50 A surge and 60 W non-repetitive peak power, meeting ISO 7637-2 Pulse 5a requirements without derating.	Use Scenario: Precision voltage reference in isolated flyback converter feedback loop using optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Zener-based shunt reference providing stable 91 V reference for TL431 bias network or secondary-side sensing. Use Value: ±5% V_Z tolerance and <250 Ω Z_ZT ensure tight output regulation across line/load variations.
Telecom Line Card Surge Suppression	Medical Equipment Input Stage Regulation
Use Scenario: Secondary-level overvoltage protection on −48 V telecom power distribution boards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: High-voltage Zener clamp placed before DC-DC modules and hot-swap controllers. Use Value: 91 V clamping threshold aligns with −48 V system derating margins; 175 °C T_JMAX supports sealed chassis thermal profiles.	Use Scenario: Input-stage voltage stabilization for isolated patient-monitoring analog front-ends powered from external adapters. IC Role / Device Role / Timing Role: Low-leakage (≤0.25 µA) shunt regulator maintaining clean reference for ADC drivers and signal conditioners. Use Value: Ultra-low IR minimizes quiescent current draw and self-heating, preserving measurement accuracy in low-power modes.

Automotive Power Rail Protection

Industrial DC-DC Converter Feedback

Use Scenario: Clamping induced transients on 12 V/24 V battery-fed ECUs during load dump or jump-start events.

IC Role / Device Role / Timing Role: Standalone voltage clamp protecting downstream LDOs, microcontrollers, and CAN transceivers.

Use Value: Withstands 50 A surge and 60 W non-repetitive peak power, meeting ISO 7637-2 Pulse 5a requirements without derating.

Use Scenario: Precision voltage reference in isolated flyback converter feedback loop using optocoupler-coupled error amplifier.

IC Role / Device Role / Timing Role: Zener-based shunt reference providing stable 91 V reference for TL431 bias network or secondary-side sensing.

Use Value: ±5% V_Z tolerance and <250 Ω Z_ZT ensure tight output regulation across line/load variations.

Telecom Line Card Surge Suppression

Medical Equipment Input Stage Regulation

Use Scenario: Secondary-level overvoltage protection on −48 V telecom power distribution boards exposed to lightning-induced surges.

IC Role / Device Role / Timing Role: High-voltage Zener clamp placed before DC-DC modules and hot-swap controllers.

Use Value: 91 V clamping threshold aligns with −48 V system derating margins; 175 °C T_JMAX supports sealed chassis thermal profiles.

Use Scenario: Input-stage voltage stabilization for isolated patient-monitoring analog front-ends powered from external adapters.

IC Role / Device Role / Timing Role: Low-leakage (≤0.25 µA) shunt regulator maintaining clean reference for ADC drivers and signal conditioners.

Use Value: Ultra-low IR minimizes quiescent current draw and self-heating, preserving measurement accuracy in low-power modes.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4763A	Same 91 V ±5%, but DO-41 through-hole package; higher R_THJA (100 K/W vs. 76.8 K/W); no AEC-Q101 qualification	Not suitable for automated SMT lines or automotive under-hood use; limited thermal performance on compact PCBs	Select only for prototyping or legacy through-hole designs where reflow compatibility is not required
BZX84-C91	SOT-23 package; 91 V ±5%; 300 mW rating; Z_ZT = 300 Ω @ 5 mA; no surge rating specified	Inadequate for >1 W continuous or surge-limited applications; unsuitable for ISO 7637-2 compliance	Use only in low-power signal-level clamping where space constraints outweigh power handling needs

Compared with 1N4763A and BZX84-C91, the 1SMA4763H delivers superior thermal dissipation in SMT format, automotive-grade reliability via AEC-Q101, and validated 50 A surge capability-making it the only option among the three qualified for production automotive power rail protection.

Availability

1SMA4763H is available at Aetrix Electronics and suitable for automotive ECU protection, industrial DC-DC converter feedback, and telecom line card surge suppression requiring stable component supply and full traceability.

Supply support for 1SMA4763H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, rectifiers, and protection components with global distribution and AEC-Q101 validation capability.

The 1SMA47xxH series targets high-reliability surface-mount Zener regulation and transient suppression, designed specifically for automotive, industrial, and telecom applications demanding robust surge immunity and stable voltage reference performance.

FAQ

What is the zener voltage tolerance for 1SMA4763H?

The 1SMA4763H has a nominal zener voltage of 91 V with a standard tolerance of ±5%, meaning the actual measured V_Z falls between 86.45 V and 95.55 V when tested at 2.8 mA and 30 °C lead temperature. This tolerance is guaranteed per JEDEC registration and applies across the full operating temperature range of −55 °C to +175 °C.

Is 1SMA4763H qualified for automotive applications?

Yes, the 1SMA4763H is AEC-Q101 qualified, confirming its suitability for automotive electronic systems including engine control units, body control modules, and ADAS sensor interfaces. The qualification covers stress testing for temperature cycling, humidity, mechanical shock, and solderability-ensuring reliability in harsh under-hood environments.

What is the maximum non-repetitive surge power rating for 1SMA4763H?

The 1SMA4763H supports a maximum non-repetitive peak surge power of 60 W, tested using a 100 µs square pulse at 25 °C ambient. This rating corresponds to its 50 A peak surge current (I_FSM) at 8.3 ms half-sine waveform and enables compliance with ISO 7637-2 Pulse 5a for automotive load dump protection.

Does 1SMA4763H have a specified junction-to-ambient thermal resistance?

Yes, the 1SMA4763H specifies R_THJA < 76.8 K/W when mounted on a PCB with a 5 mm × 5 mm copper pad, enabling 1 W continuous power dissipation at 25 °C ambient. Derating begins linearly above 25 °C, reaching zero power at 125 °C ambient per the published derating curve (Fig.1).

What marking code identifies 1SMA4763H on the device body?

The 1SMA4763H is marked with the code "763A" on its DO-214AC (SMA) package body, adjacent to the cathode band. This two-character prefix "763" denotes the 91 V nominal zener voltage, while "A" indicates the ±5% tolerance grade per Taiwan Semiconductor's standardized marking scheme.

1SMA4763H Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AC, SMA

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 91 V

Tolerance:: ±5%

Power - Max:: 1.25 W

Impedance (Max) (Zzt):: 250 Ohms

Current - Reverse Leakage @ Vr:: 1 µA @ 69.2 V

Voltage - Forward (Vf) (Max) @ If:: -

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AC (SMA)

1SMA4763H FAQ

1.How can I place an order for 1SMA4763H through Aetrix?

Please submit a Request for Quotation (RFQ) for 1SMA4763H on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 1SMA4763H reliable?

The price and inventory of 1SMA4763H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA4763H is usually 5 days.

3.What payment methods are accepted for 1SMA4763H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA4763H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1SMA4763H?

1SMA4763H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1SMA4763H order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 1SMA4763H?

For technical support, including 1SMA4763H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA4763H requirements.

6.How does Aetrix verify that 1SMA4763H is sourced from the original manufacturer or authorized distributors?

All 1SMA4763H products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 1SMA4763H meets industry standards.

7.What is the process for return or replacement of 1SMA4763H?

All 1SMA4763H units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA4763H, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 1SMA4763H part is unused and in its original packaging.

Return procedure for 1SMA4763H:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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