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

Taiwan Semiconductor Corporation 1SMA4756H

Name: 1SMA4756H
Brand: Taiwan Semiconductor Corporation
SKU: 1SMA4756H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1SMA4756H

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Zener Diodes

Package:: DO-214AC, SMA

Datasheet:: 1SMA4756H.pdf

Description:: DIODE ZENER 47V 1.25W DO214AC

Quantity:: RFQ Add To RFQ list

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Inventory:3,340

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Product details

Overview

1SMA4756H from Taiwan Semiconductor is a surface-mount 47 V, 1 W Zener diode in DO-214AC (SMA) package, rated for 5.5 mA test current, 80 Ω dynamic impedance at IZT, and 0.25 µA leakage at 35.8 V reverse bias-used for precision voltage regulation and overvoltage protection in automotive power rails and industrial sensor interfaces.

For engineers reviewing the 1SMA4756H datasheet, 1SMA4756H pinout, 1SMA4756H application, or 1SMA4756H equivalent, key selection criteria include its AEC-Q101 qualification, ±5% VZ tolerance, low-inductance SMA package, TJ max of 175°C, and verified surge capability up to 95 A (8.3 ms half-sine).

Technical Context

The 1SMA4756H operates as a single-die, glass-passivated Zener diode with sharp reverse-breakdown characteristics. Its 47 V nominal zener voltage is specified at 5.5 mA test current (IZT), with dynamic impedance (ZZT) of 80 Ω measured under 10% AC ripple superimposed on IZT at 1 kHz.

It supports high-reliability operation across –55°C to +175°C junction temperature range and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements-enabling use in reflow-soldered automotive ECUs without derating concerns.

Key Specifications

Parameter	Value and Actual Design Meaning
VZ @ IZT	47 V ±5% at 5.5 mA - defines stable regulation point for feedback loops in DC-DC converters
P_D	1 W at T_A = 25°C - sets maximum continuous power dissipation on standard PCB copper pads
Z_ZT @ IZT	80 Ω - determines output impedance and regulation error under load transients
I_R @ V_R	0.25 µA at 35.8 V - ensures minimal standby current in battery-powered protection circuits
T_J max	+175°C - enables placement near hot components (e.g., MOSFETs, inductors) without thermal shutdown
I_FSM	30 A (8.3 ms half-sine) - withstands common automotive load-dump surges per ISO 7637-2
Package	DO-214AC (SMA) - surface-mount footprint compatible with automated pick-and-place and reflow

Pinout & Package

DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, cathode indicated by band, weight ≈ 0.060 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower-potential node in reverse-biased regulation configuration
Cathode	Zener breakdown terminal	Connected to regulated rail; polarity marked by visible band on body

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing
Glass passivated junction	Enhances long-term stability and reduces parameter drift under thermal stress
Low inductance construction	Minimizes voltage overshoot during fast transient suppression (e.g., ESD, load dump)
Moisture sensitivity level 1	Eliminates bake requirement prior to reflow soldering-reduces manufacturing cost and risk
RoHS and halogen-free	Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green electronics

Applications

Automotive Power Rail Protection	Industrial Sensor Signal Conditioning
Use Scenario: Clamping 12 V battery line against ISO 7637-2 pulse 5a (load dump) in engine control modules. IC Role / Device Role / Timing Role: Standby Zener clamp operating in reverse breakdown to limit voltage to ≤50 V. Use Value: Withstands 30 A surge (8.3 ms) and maintains <0.25 µA leakage below 35.8 V-preserving system sleep current budget.	Use Scenario: Providing stable 47 V reference for analog front-end gain calibration in factory-floor pressure transmitters. IC Role / Device Role / Timing Role: Precision shunt reference with ±5% VZ tolerance and 80 Ω dynamic impedance. Use Value: Enables <±0.5% full-scale accuracy over –40°C to +125°C ambient due to low TC and glass passivation.
DC-DC Converter Feedback Regulation	Overvoltage Detection in Telecom PSU
Use Scenario: Replacing TL431 in isolated flyback feedback path where higher VZ and lower IZT simplify bias design. IC Role / Device Role / Timing Role: Shunt regulator setting secondary-side output voltage via optocoupler LED current. Use Value: 5.5 mA IZT allows direct resistor bias from 52 V auxiliary winding-no additional current source needed.	Use Scenario: Detecting >45 V fault condition on 48 V telecom backup supply before enabling downstream DC-DC stages. IC Role / Device Role / Timing Role: Threshold detector triggering comparator input when reverse voltage exceeds 47 V. Use Value: Sharp knee at 47 V ±5% and <1 µA IR below 35.8 V ensure clean, noise-immune trip decision.

Automotive Power Rail Protection

Industrial Sensor Signal Conditioning

Use Scenario: Clamping 12 V battery line against ISO 7637-2 pulse 5a (load dump) in engine control modules.

IC Role / Device Role / Timing Role: Standby Zener clamp operating in reverse breakdown to limit voltage to ≤50 V.

Use Value: Withstands 30 A surge (8.3 ms) and maintains <0.25 µA leakage below 35.8 V-preserving system sleep current budget.

Use Scenario: Providing stable 47 V reference for analog front-end gain calibration in factory-floor pressure transmitters.

IC Role / Device Role / Timing Role: Precision shunt reference with ±5% VZ tolerance and 80 Ω dynamic impedance.

Use Value: Enables <±0.5% full-scale accuracy over –40°C to +125°C ambient due to low TC and glass passivation.

DC-DC Converter Feedback Regulation

Overvoltage Detection in Telecom PSU

Use Scenario: Replacing TL431 in isolated flyback feedback path where higher VZ and lower IZT simplify bias design.

IC Role / Device Role / Timing Role: Shunt regulator setting secondary-side output voltage via optocoupler LED current.

Use Value: 5.5 mA IZT allows direct resistor bias from 52 V auxiliary winding-no additional current source needed.

Use Scenario: Detecting >45 V fault condition on 48 V telecom backup supply before enabling downstream DC-DC stages.

IC Role / Device Role / Timing Role: Threshold detector triggering comparator input when reverse voltage exceeds 47 V.

Use Value: Sharp knee at 47 V ±5% and <1 µA IR below 35.8 V ensure clean, noise-immune trip decision.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C47	0.3 W SOT-23 package; 47 V ±5%; IZT = 5 mA; ZZT = 90 Ω	Limited to low-power signal-level clamping; not AEC-Q101 qualified	Select for space-constrained PCBs where 1 W dissipation is unnecessary
SMBJ47A	400 W TVS diode in DO-214AA; 47 V standoff; clamping voltage 77 V at 10 A	Designed for transient suppression-not precision regulation	Choose only for surge-only protection; cannot replace 1SMA4756H in regulation roles

Compared with BZX84-C47 and SMBJ47A, the 1SMA4756H uniquely combines automotive qualification, 1 W continuous power, and tight 47 V regulation-making it the sole choice for high-stability, high-reliability shunt references in harsh environments.

Availability

1SMA4756H is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor reference design, and telecom overvoltage detection requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 1SMA4756H 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, analog ICs, and protection components with global distribution and AEC-Q101 validation capability.

The 1SMA47xxH series was designed specifically for automotive and industrial applications demanding robust, surface-mount Zener regulation with guaranteed surge immunity and long-term parametric stability.

FAQ

What is the zener voltage tolerance for 1SMA4756H?

The 1SMA4756H has a nominal zener voltage of 47 V with a standard tolerance of ±5%, meaning the actual VZ falls between 44.65 V and 49.35 V when measured at 5.5 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 junction temperature.

Is 1SMA4756H suitable for automotive applications?

Yes, the 1SMA4756H is AEC-Q101 qualified and tested for automotive-grade reliability-including temperature cycling, high-temperature reverse bias (HTRB), and mechanical shock. Its DO-214AC package, 175°C max junction temperature, and 30 A surge rating make it appropriate for engine control units, body electronics, and ADAS power domains per ISO 16750-2.

What is the maximum surge current rating for 1SMA4756H?

The 1SMA4756H is rated for 30 A non-repetitive peak forward surge current (I_FSM) under an 8.3 ms single half-sine wave condition, and supports up to 95 A reverse surge current at 47 V for the same waveform per its electrical specifications table. These ratings align with ISO 7637-2 Pulse 5a load-dump requirements.

Does 1SMA4756H require moisture preconditioning before reflow?

No, the 1SMA4756H has a moisture sensitivity level (MSL) of Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/60% RH and placed directly into reflow without baking. This eliminates process steps and reduces risk of popcorn cracking during assembly.

How does the dynamic impedance of 1SMA4756H affect regulation accuracy?

The 1SMA4756H exhibits 80 Ω dynamic impedance (Z_ZT) at 5.5 mA test current, which means a 1 mA change in zener current causes approximately 80 mV shift in output voltage. This value is critical for maintaining <±1% regulation in feedback networks where load current varies-designers must size series resistors to keep IZ within ±10% of IZT for optimal stability.

1SMA4756H 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):: 47 V

Tolerance:: ±5%

Power - Max:: 1.25 W

Impedance (Max) (Zzt):: 80 Ohms

Current - Reverse Leakage @ Vr:: 1 µA @ 35.8 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)

1SMA4756H FAQ

1.How can I place an order for 1SMA4756H through Aetrix?

Please submit a Request for Quotation (RFQ) for 1SMA4756H 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 1SMA4756H reliable?

The price and inventory of 1SMA4756H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA4756H is usually 5 days.

3.What payment methods are accepted for 1SMA4756H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA4756H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1SMA4756H?

1SMA4756H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1SMA4756H 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 1SMA4756H?

For technical support, including 1SMA4756H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA4756H requirements.

6.How does Aetrix verify that 1SMA4756H is sourced from the original manufacturer or authorized distributors?

All 1SMA4756H 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 1SMA4756H meets industry standards.

7.What is the process for return or replacement of 1SMA4756H?

All 1SMA4756H units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA4756H, 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 1SMA4756H part is unused and in its original packaging.

Return procedure for 1SMA4756H:

1.Submit a request within 90 days.

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

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