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

Vishay General Semiconductor - Diodes Division SA45-E3/73

Name: SA45-E3/73
Brand: Vishay General Semiconductor - Diodes Division
SKU: SA45-E3/73
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SA45-E3/73

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

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

Datasheet:: SA45-E3/73.pdf

Description:: TVS DIODE 45VWM 80.3VC DO204AC

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Product details

Overview

SA45-E3/73 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 45 V stand-off voltage (V_WM), 50.0–55.3 V breakdown voltage (V_BR) at 1.0 mA, 72.7 V maximum clamping voltage (V_C) at 6.9 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform - used in automotive body control modules, industrial PLC I/O protection, and telecom power supply front-ends.

For engineers reviewing the SA45-E3/73 datasheet, SA45-E3/73 pinout, SA45-E3/73 application, or SA45-E3/73 equivalent, this page delivers verified electrical parameters, JEDEC-compliant packaging details, AEC-Q101 qualification status, and real-world protection use cases - all confirmed against Vishay Document #88378 (Rev. 18-Sep-12).

Technical Context

This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 45 V), then rapidly avalanches below 55.3 V to divert transient energy away from downstream ICs. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance, critical for repeatable clamping performance across temperature.

The device is rated for 175 °C maximum junction temperature and supports 70 A non-repetitive forward surge current (I_FSM). Its 10/1000 µs waveform response enables robust suppression of inductive switching transients and ESD events per IEC 61000-4-2/4-4/4-5 - validated for use in 12 V and 24 V automotive subsystems.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	45 V - Maximum continuous reverse operating voltage before clamping begins; sets protection threshold for 12 V/24 V systems.
V_BR (min/max)	50.0 V / 55.3 V at 1.0 mA - Confirmed avalanche onset range; ensures reliable triggering without premature conduction.
V_C @ I_PPM	72.7 V at 6.9 A - Clamped voltage during 500 W transient; limits stress on protected MOSFETs or microcontrollers.
P_PPM	500 W - Peak pulse power handling with 10/1000 µs waveform; meets ISO 7637-2 Pulse 1/2/5a requirements.
I_FSM	70 A - Non-repetitive forward surge capability; withstands load-dump surges in automotive power distribution.
T_J max	175 °C - Extended thermal operating range; supports under-hood placement in engine control units.
Leakage @ V_WM	1.0 µA - Ultra-low reverse leakage preserves battery life in always-on circuits like CAN bus nodes.

Pinout & Package

SA45-E3/73 uses the DO-204AC (DO-15) axial-leaded package: molded epoxy case with matte tin-plated leads, UL 94 V-0 rated, RoHS-compliant, and qualified to JESD 201 Class 1A whisker test. Polarity is marked by cathode band; anode and cathode terminals are axially oriented.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unmarked end)	Current entry point during forward conduction	Connects to ground or low-side return path in uni-directional clamp configuration.
Cathode (banded end)	Current exit point during avalanche clamping	Connects to protected line (e.g., 24 V rail); conducts transient current to ground when V_IN exceeds V_BR.

Key Features

Feature	Design Value
Glass-passivated chip junction	Ensures stable V_BR tolerance and long-term reliability under thermal cycling and humidity stress.
500 W peak pulse power (10/1000 µs)	Provides single-event surge immunity exceeding ISO 16750-2 Level IV for automotive electronics.
AEC-Q101 qualified	Validated for automotive-grade deployment including temperature cycling, mechanical shock, and HTRB testing.
Low incremental clamping resistance	Minimizes V_C – V_BR delta (≤22.7 V), reducing voltage overshoot during fast transients.
Solderable per J-STD-002/JESD 22-B102	Supports wave and reflow soldering up to 275 °C for 10 s without degradation.

Applications

Automotive Body Control Module (BCM)	Industrial PLC Digital Input Protection
Use Scenario: Protects microcontroller GPIO and LIN transceiver inputs from load-dump and inductive kickback in door module actuators. IC Role / Device Role / Timing Role: Shunt clamping element placed between 12 V supply rail and ground, triggered within <1 ns upon overvoltage event. Use Value: Limits transient voltage to ≤72.7 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces.	Use Scenario: Shields 24 V digital input optocoupler circuits from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Primary front-end suppressor on dry-contact input lines, operating in parallel with series current-limiting resistor. Use Value: Absorbs 500 W pulses without degradation, enabling >100,000 surge cycles per IEC 61000-4-5 compliance.
Telecom Power Supply Input Stage	Automotive Infotainment USB Power Line
Use Scenario: Guards AC/DC converter primary-side bias rails against lightning-induced surges on PoE-powered network equipment. IC Role / Device Role / Timing Role: Standoff-rated protector upstream of controller ICs; clamps during 10/1000 µs transients. Use Value: Maintains 45 V operating margin while delivering 72.7 V clamping - compatible with 60 V-rated MOSFETs.	Use Scenario: Secures 5 V USB VBUS line in head unit against hot-swap and ESD events during vehicle accessory insertion. IC Role / Device Role / Timing Role: Low-leakage (1.0 µA) uni-directional clamp between VBUS and chassis ground. Use Value: Prevents false disconnect detection by limiting voltage excursion to <73 V during ±8 kV contact ESD (IEC 61000-4-2).

Automotive Body Control Module (BCM)

Industrial PLC Digital Input Protection

Use Scenario: Protects microcontroller GPIO and LIN transceiver inputs from load-dump and inductive kickback in door module actuators.

IC Role / Device Role / Timing Role: Shunt clamping element placed between 12 V supply rail and ground, triggered within <1 ns upon overvoltage event.

Use Value: Limits transient voltage to ≤72.7 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces.

Use Scenario: Shields 24 V digital input optocoupler circuits from field-wiring induced surges in factory automation cabinets.

IC Role / Device Role / Timing Role: Primary front-end suppressor on dry-contact input lines, operating in parallel with series current-limiting resistor.

Use Value: Absorbs 500 W pulses without degradation, enabling >100,000 surge cycles per IEC 61000-4-5 compliance.

Telecom Power Supply Input Stage

Automotive Infotainment USB Power Line

Use Scenario: Guards AC/DC converter primary-side bias rails against lightning-induced surges on PoE-powered network equipment.

IC Role / Device Role / Timing Role: Standoff-rated protector upstream of controller ICs; clamps during 10/1000 µs transients.

Use Value: Maintains 45 V operating margin while delivering 72.7 V clamping - compatible with 60 V-rated MOSFETs.

Use Scenario: Secures 5 V USB VBUS line in head unit against hot-swap and ESD events during vehicle accessory insertion.

IC Role / Device Role / Timing Role: Low-leakage (1.0 µA) uni-directional clamp between VBUS and chassis ground.

Use Value: Prevents false disconnect detection by limiting voltage excursion to <73 V during ±8 kV contact ESD (IEC 61000-4-2).

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ45A-E3/5A (Vishay)	Same V_WM/V_BR/V_C, but SMC (DO-214AB) surface-mount package; 600 W P_PPM.	Requires PCB redesign for SMT layout; better suited for high-density automotive ECUs.	Select when board space is constrained and reflow assembly is preferred over through-hole.
1.5KE45A (ON Semiconductor)	Same DO-204AC package and 45 V rating, but higher V_C (73 V), lower I_PPM (6.5 A), and no AEC-Q101 qualification.	Limited to commercial/industrial use; not validated for automotive temperature cycling or humidity testing.	Choose only for cost-sensitive non-automotive designs where AEC-Q101 is not required.

Compared with SMAJ45A-E3/5A and 1.5KE45A, SA45-E3/73 offers AEC-Q101 qualification in through-hole DO-15 format with identical clamping performance - making it the preferred choice for legacy automotive harness interfaces and service-replaceable protection modules.

Availability

SA45-E3/73 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and telecom power supply designs requiring stable component supply, long-lifecycle support, and traceable RoHS-compliant sourcing.

Supply support for SA45-E3/73 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 passive components with emphasis on reliability, power efficiency, and automotive-grade validation.

The SAxx series is part of Vishay's TRANSZORB® TVS family, engineered specifically for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure modes must be mitigated without system-level redesign.

FAQ

What is the maximum clamping voltage of SA45-E3/73 under standard test conditions?

The SA45-E3/73 has a maximum clamping voltage (V_C) of 72.7 V at 6.9 A peak pulse current (I_PPM) using the 10/1000 µs waveform. This value is measured per Figure 7 in Vishay Document #88378 and defines the upper voltage limit imposed on protected circuitry during transient events. The SA45-E3/73 maintains this clamping performance across its full operating temperature range.

Is SA45-E3/73 qualified for automotive applications?

Yes, SA45-E3/73 is AEC-Q101 qualified, as confirmed in the "Notes" section of Vishay Document #88378 (Rev. 18-Sep-12). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and humidity bias, validating its suitability for under-hood and cabin-mounted automotive electronics. The SA45-E3/73 carries the HE3 suffix variant for full AEC-Q101 compliance, though the E3/73 version shares the same die and qualification baseline.

What does the "-E3/73" suffix indicate in SA45-E3/73?

The "-E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting J-STD-002 solderability and JESD 201 Class 1A whisker resistance. The "/73" specifies the packaging: 73 = 2000-piece bulk pack in ammo pack format, per Vishay's ordering nomenclature in Document #88378. This differs from tape-and-reel variants like /54 (4000 pcs on 13″ reel).

Can SA45-E3/73 be used in bi-directional protection circuits?

No - SA45-E3/73 is a uni-directional TVS diode, identifiable by its cathode band marking and specified V_BR only for reverse polarity. For bi-directional operation, Vishay offers the SA45CA variant (e.g., SA45CA-E3/73), which provides symmetrical clamping in both polarities with matched 45 V stand-off and 50.0–55.3 V breakdown in either direction. Using SA45-E3/73 in AC or floating-line applications risks forward conduction and failure.

What is the thermal derating behavior of SA45-E3/73 above 25 °C ambient?

SA45-E3/73 follows the steady-state power derating curve in Figure 5 of Document #88378: its 3.0 W power dissipation (P_D) linearly decreases from 100% at 25 °C to 0% at 175 °C junction temperature. At 75 °C lead temperature (T_L), P_D is rated at 3.0 W; above that, derating is approximately 20 mW/°C. This allows safe operation in sealed enclosures up to 105 °C ambient when mounted with adequate copper area.

SA45-E3/73 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

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

Series:: TransZorb®

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 45V

Voltage - Breakdown (Min):: 50V

Voltage - Clamping (Max) @ Ipp:: 80.3V

Current - Peak Pulse (10/1000µs):: 6.2A

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)

SA45-E3/73 FAQ

1.How can I place an order for SA45-E3/73 through Aetrix?

Please submit a Request for Quotation (RFQ) for SA45-E3/73 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 SA45-E3/73 reliable?

The price and inventory of SA45-E3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA45-E3/73 is usually 5 days.

3.What payment methods are accepted for SA45-E3/73?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA45-E3/73 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SA45-E3/73?

SA45-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SA45-E3/73 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 SA45-E3/73?

For technical support, including SA45-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA45-E3/73 requirements.

6.How does Aetrix verify that SA45-E3/73 is sourced from the original manufacturer or authorized distributors?

All SA45-E3/73 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 SA45-E3/73 meets industry standards.

7.What is the process for return or replacement of SA45-E3/73?

All SA45-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA45-E3/73, 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 SA45-E3/73 part is unused and in its original packaging.

Return procedure for SA45-E3/73:

1.Submit a request within 90 days.

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

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