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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Vishay General Semiconductor - Diodes Division SA43-E3/54

Name: SA43-E3/54
Brand: Vishay General Semiconductor - Diodes Division
SKU: SA43-E3/54
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SA43-E3/54

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-204AC, DO-15, Axial

Datasheet:: SA43-E3/54.pdf

Description:: TVS DIODE 43VWM 76.7VC DO204AC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SA43-E3/54 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for primary overvoltage protection of DC power rails and signal lines. It features a 43 V stand-off voltage (V_WM), 47.8–52.8 V breakdown voltage (V_BR) at 1 mA, 69.4 V maximum clamping voltage (V_C) at 7.2 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform - suitable for automotive power supply input protection against load dump and ISO 7637-2 transients.

For engineers reviewing the SA43-E3/54 datasheet, SA43-E3/54 pinout, SA43-E3/54 application, or SA43-E3/54 equivalent, this part is evaluated for robust ESD and surge immunity in 12 V/24 V automotive electronics, industrial I/O interfaces, and DC-DC converter input stages where fast response (<1 ns), low clamping ratio, and AEC-Q101 qualification are required.

Technical Context

The SA43-E3/54 operates as a silicon avalanche diode with glass-passivated junction, enabling sub-nanosecond response to transient overvoltages. Its uni-directional polarity uses a cathode band marking and exhibits 3.5 V maximum forward voltage at 100 A surge, supporting high-current fault clearing without latch-up.

Thermal design relies on its 175 °C maximum junction temperature and 3.0 W steady-state power dissipation on infinite heatsink at T_L = 75 °C. The device is rated for 70 A non-repetitive forward surge current (I_FSM) per 10 ms half-sine wave, and meets JESD 201 Class 1A whisker resistance with matte tin-plated leads.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	43 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 12 V/24 V systems.
V_BR (min/max)	47.8 V / 52.8 V at I_T = 1 mA - Tight breakdown tolerance ensures predictable turn-on across temperature and production lot.
V_C @ I_PPM	69.4 V at 7.2 A (10/1000 µs) - Low clamping voltage limits stress on downstream MOSFETs or regulators during surge events.
P_PPM	500 W - Sustains standardized lightning/surge pulses without degradation; validated per IEC 61000-4-5 Level 3.
I_FSM	70 A - Withstands high-energy inductive switching surges (e.g., relay coil de-energization) without bond wire failure.
T_J max	175 °C - Enables operation in under-hood automotive environments and high-ambient industrial enclosures.
AEC-Q101	Qualified - Certified for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard.

Pinout & Package

Package: DO-204AC (DO-15), axial-leaded, molded epoxy case meeting UL 94 V-0 flammability rating. Cathode indicated by color band on one end; anode is unmarked lead.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unmarked lead)	Current entry terminal in forward bias; connected to lower-potential side of protected circuit	Enables standard placement on positive rail (cathode to rail, anode to ground) for uni-directional clamping.
Cathode (banded lead)	Current exit terminal in forward bias; connected to higher-potential side (e.g., V_IN rail)	Provides low-impedance path to ground during overvoltage, diverting surge current away from sensitive ICs.

Key Features

Feature	Design Value
Glass-passivated chip junction	Ensures stable V_BR and leakage performance over 1000+ thermal cycles; eliminates interfacial corrosion in humid environments.
500 W peak pulse power (10/1000 µs)	Supports repeated ISO 7637-2 Pulse 5a (load dump) events up to 300 V without parameter shift or failure.
Low incremental surge resistance	Minimizes V_C overshoot during fast-rising transients (e.g., EFT bursts), improving protection margin for 3.3 V/5 V logic.
AEC-Q101 qualification	Validates suitability for automotive powertrain, body control, and ADAS modules requiring zero-defect field reliability.
RoHS-compliant, matte tin plating	Meets J-STD-002 solderability and JESD 201 Class 1A whisker resistance - compatible with lead-free reflow and wave soldering.

Applications

Automotive Power Input Protection	Industrial Sensor Interface Protection
Use Scenario: 12 V battery-fed ECUs exposed to load dump (up to 40 V, 400 ms) and jump-start surges (24 V). IC Role / Device Role / Timing Role: Primary clamping element placed between battery rail and DC-DC input, absorbing >95 % of surge energy before it reaches regulator. Use Value: Limits rail voltage to ≤69.4 V during 7.2 A transients, preventing damage to 40 V-rated input MOSFETs and LDOs.	Use Scenario: Analog sensor outputs (e.g., pressure, temperature) routed through long cables in factory automation cabinets. IC Role / Device Role / Timing Role: Point-of-entry TVS on differential pair or single-ended signal line, shunting induced EFT or ESD to chassis ground. Use Value: Sub-1 ns response clamps ±15 kV contact ESD (IEC 61000-4-2) to <100 V, preserving ADC reference integrity and amplifier offset stability.
DC-DC Converter Input Stage	Telecom Line Card Surge Protection
Use Scenario: 48 V input to isolated flyback converter powering PoE controllers in network switches. IC Role / Device Role / Timing Role: First-line defense upstream of input filter capacitor, handling repetitive 10/1000 µs surges from shared power bus coupling. Use Value: 500 W rating sustains 100+ surge events at 1 Hz duty cycle without derating, maintaining consistent clamping performance over product lifetime.	Use Scenario: -48 V DC power feed to line cards in central office equipment subject to lightning-induced longitudinal surges. IC Role / Device Role / Timing Role: Uni-directional clamp on negative rail relative to ground, protecting PMICs and PHY transceivers from common-mode transients. Use Value: 43 V V_WM provides 5 V margin above nominal -48 V rail, while 69.4 V V_C stays below absolute maximum ratings of -55 V tolerant components.

Automotive Power Input Protection

Industrial Sensor Interface Protection

Use Scenario: 12 V battery-fed ECUs exposed to load dump (up to 40 V, 400 ms) and jump-start surges (24 V).

IC Role / Device Role / Timing Role: Primary clamping element placed between battery rail and DC-DC input, absorbing >95 % of surge energy before it reaches regulator.

Use Value: Limits rail voltage to ≤69.4 V during 7.2 A transients, preventing damage to 40 V-rated input MOSFETs and LDOs.

Use Scenario: Analog sensor outputs (e.g., pressure, temperature) routed through long cables in factory automation cabinets.

IC Role / Device Role / Timing Role: Point-of-entry TVS on differential pair or single-ended signal line, shunting induced EFT or ESD to chassis ground.

Use Value: Sub-1 ns response clamps ±15 kV contact ESD (IEC 61000-4-2) to <100 V, preserving ADC reference integrity and amplifier offset stability.

DC-DC Converter Input Stage

Telecom Line Card Surge Protection

Use Scenario: 48 V input to isolated flyback converter powering PoE controllers in network switches.

IC Role / Device Role / Timing Role: First-line defense upstream of input filter capacitor, handling repetitive 10/1000 µs surges from shared power bus coupling.

Use Value: 500 W rating sustains 100+ surge events at 1 Hz duty cycle without derating, maintaining consistent clamping performance over product lifetime.

Use Scenario: -48 V DC power feed to line cards in central office equipment subject to lightning-induced longitudinal surges.

IC Role / Device Role / Timing Role: Uni-directional clamp on negative rail relative to ground, protecting PMICs and PHY transceivers from common-mode transients.

Use Value: 43 V V_WM provides 5 V margin above nominal -48 V rail, while 69.4 V V_C stays below absolute maximum ratings of -55 V tolerant components.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ43A-E3/5T	Same V_WM (43 V), identical DO-214AC package, but 400 W P_PPM and higher V_C (70.1 V at 5.7 A).	Lower peak power handling reduces margin for sustained load dump; better suited for space-constrained PCBs where SMA footprint is preferred.	Select SMAJ43A-E3/5T only when board area is critical and surge energy is limited to IEC 61000-4-5 Level 2.
1.5KE43A	Higher P_PPM (1500 W), larger DO-201AD package, same V_WM/V_BR range, but no AEC-Q101 qualification.	Used in non-automotive industrial power supplies where mechanical robustness and cost outweigh qualification requirements.	Choose 1.5KE43A for high-energy AC/DC front-end protection where AEC-Q101 is not mandated and TO-277 footprint is acceptable.

Compared with SMAJ43A-E3/5T and 1.5KE43A, SA43-E3/54 delivers optimal balance of AEC-Q101 reliability, DO-15 form factor, and 500 W surge capacity - making it the preferred choice for automotive and high-reliability embedded systems where qualification and proven field performance are mandatory.

Availability

SA43-E3/54 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power distribution systems requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for SA43-E3/54 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

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.

The SAxx series is engineered for transient overvoltage protection in harsh environments - targeting automotive, industrial, and telecom applications where fast response, stable clamping, and qualification compliance are non-negotiable.

FAQ

What is the maximum clamping voltage of the SA43-E3/54 under standard surge conditions?

The SA43-E3/54 has a maximum clamping voltage (V_C) of 69.4 V at 7.2 A peak pulse current with a 10/1000 µs waveform. This value is measured per industry-standard test conditions and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components remain within their absolute maximum ratings.

Is the SA43-E3/54 qualified for automotive applications?

Yes, the SA43-E3/54 is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias, temperature cycling, and ESD per JESD22-A114. This qualification confirms its suitability for automotive powertrain, body electronics, and infotainment systems where zero-defect reliability is required over extended temperature ranges and service life.

What does the "E3/54" suffix indicate in SA43-E3/54?

The "E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting JESD 201 Class 1A whisker resistance. The "/54" specifies packaging in 13-inch paper tape and reel with a base quantity of 4000 units - standard for automated SMT assembly and consistent with Vishay's ordering nomenclature for DO-15 devices.

Can SA43-E3/54 be used in bi-directional protection circuits?

No, SA43-E3/54 is a uni-directional TVS diode, identifiable by its cathode band marking. For bi-directional applications (e.g., AC lines or differential data buses), the SA43CA variant must be used - which has symmetrical breakdown in both polarities and no polarity marking. Using SA43-E3/54 in reverse-biased AC configurations risks permanent failure due to forward conduction.

What is the thermal derating behavior of SA43-E3/54 above 25 °C ambient?

The SA43-E3/54 follows a linear derating curve from 100 % power at 25 °C to 0 % at 175 °C junction temperature. Its steady-state power dissipation (P_D) drops to 1.5 W at T_L = 100 °C and 0 W at T_L = 175 °C, per Figure 5 in the datasheet. Designers must calculate lead temperature rise using actual PCB copper area and airflow to ensure T_J remains within limits during continuous operation.

SA43-E3/54 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Package/Case:: DO-204AC, DO-15, Axial

Series:: TransZorb®

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 43V

Voltage - Breakdown (Min):: 47.8V

Voltage - Clamping (Max) @ Ipp:: 76.7V

Current - Peak Pulse (10/1000µs):: 6.5A

Power - Peak Pulse:: 500W

Power Line Protection:: No

Applications:: General Purpose

Capacitance @ Frequency:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AC (DO-15)

SA43-E3/54 FAQ

1.How can I place an order for SA43-E3/54 through Aetrix?

Please submit a Request for Quotation (RFQ) for SA43-E3/54 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 SA43-E3/54 reliable?

The price and inventory of SA43-E3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA43-E3/54 is usually 5 days.

3.What payment methods are accepted for SA43-E3/54?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA43-E3/54 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SA43-E3/54?

SA43-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SA43-E3/54 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 SA43-E3/54?

For technical support, including SA43-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA43-E3/54 requirements.

6.How does Aetrix verify that SA43-E3/54 is sourced from the original manufacturer or authorized distributors?

All SA43-E3/54 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 SA43-E3/54 meets industry standards.

7.What is the process for return or replacement of SA43-E3/54?

All SA43-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA43-E3/54, 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 SA43-E3/54 part is unused and in its original packaging.

Return procedure for SA43-E3/54:

1.Submit a request within 90 days.

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

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