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

Vishay General Semiconductor - Diodes Division SA8.5HE3/54

Name: SA8.5HE3/54
Brand: Vishay General Semiconductor - Diodes Division
SKU: SA8.5HE3/54
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SA8.5HE3/54

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

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

Datasheet:: SA8.5HE3/54.pdf

Description:: TVS DIODE 8.5VWM 15.9VC DO204AC

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Product details

Overview

SA8.5HE3/54 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 500 W peak pulse power (10/1000 μs), 8.5 V stand-off voltage (V_WM), 9.44–10.4 V breakdown voltage (V_BR at 1 mA), 34.7 A peak pulse current (I_PPM), and clamps to ≤14.4 V at rated surge - deployed in automotive ECUs and industrial sensor interfaces.

For engineers reviewing the SA8.5HE3/54 datasheet, SA8.5HE3/54 pinout, SA8.5HE3/54 application, or SA8.5HE3/54 equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, DO-15 mechanical data, clamping behavior under 10/1000 μs transients, and direct alternatives with documented V_WM/V_C/I_PPM alignment for ESD and load-dump protection design.

Technical Context

The SA8.5HE3/54 operates as a uni-directional avalanche diode, conducting only when reverse voltage exceeds its specified V_BR range (9.44–10.4 V at 1 mA). Its glass-passivated junction enables fast response (<1 ns) and low incremental surge resistance, critical for suppressing fast-rising transients like ISO 7637-2 pulse 1 and pulse 2b.

Rated for 175 °C maximum junction temperature and qualified to AEC-Q101, it supports automotive-grade reliability in under-hood environments. The device exhibits 1.0 μA max reverse leakage at V_WM, 3.5 V max forward voltage at 100 A, and derates linearly above 25 °C ambient per Fig. 2 in the datasheet.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	8.5 V - Maximum continuous reverse operating voltage before clamping begins
V_BR (min/max)	9.44 V / 10.4 V at 1 mA - Ensures reliable turn-on within defined tolerance band for predictable clamping onset
V_C @ I_PPM	≤14.4 V at 34.7 A - Limits downstream voltage stress during 500 W transient events
P_PPM	500 W (10/1000 μs) - Sustains standardized surge energy without failure under repetitive 0.01% duty cycle
I_FSM	70 A (8.3 ms half-sine) - Withstands single high-energy inrush or load dump without bond wire fusing
T_J max	175 °C - Enables operation in high-temperature automotive and industrial enclosures
Leakage @ V_WM	≤1.0 μA - Minimizes standby power loss and avoids false triggering in low-current circuits

Pinout & Package

Package: DO-204AC (DO-15), axial-leaded, molded epoxy case meeting UL 94 V-0; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102; cathode indicated by color band.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower-potential side (e.g., ground or return path) in uni-directional TVS configuration
Cathode	Avalanche clamping terminal	Connected to protected line (e.g., 12 V rail); color band identifies this end for correct PCB orientation

Key Features

Feature	Design Value
Glass passivated chip junction	Enables <1 ns response time and stable V_BR over lifetime, critical for ESD and fast-switching noise suppression
AEC-Q101 qualification	Validated for automotive applications including engine control, body electronics, and ADAS sensor power rails
500 W peak pulse power (10/1000 μs)	Meets ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2b (battery disconnect) immunity requirements
Low incremental clamping voltage (V_C − V_BR)	≤4.96 V margin ensures protected ICs see minimal overvoltage beyond breakdown threshold
RoHS-compliant HE3 suffix	Indicates AEC-Q101 qualification and JESD 201 Class 2 whisker resistance for long-term solder joint integrity

Applications

Automotive Power Rail Protection	Industrial Sensor Interface Protection
Use Scenario: Protecting 12 V supply inputs in engine control units against load dump and alternator transients. IC Role / Device Role / Timing Role: Uni-directional TVS placed between battery rail and system input filter capacitor. Use Value: Clamps 10/1000 μs surges to ≤14.4 V, preventing damage to downstream PMICs and microcontrollers rated for 16 V absolute max.	Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) in factory automation sensors. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt induced lightning or EFT bursts before reaching op-amp front-end. Use Value: Sub-1 ns response and ≤1.0 μA leakage preserve signal accuracy while blocking >30 kV ESD per IEC 61000-4-2.
Consumer Power Adapter Input	Telecom Line Card Surge Protection
Use Scenario: Input-stage protection on AC/DC adapters subjected to mains-borne surges and switching noise. IC Role / Device Role / Timing Role: Primary clamping device after bridge rectifier, before bulk capacitor. Use Value: 500 W rating handles EN 61000-4-5 Level 3 (2 kV line-earth) surges without degradation across 1000+ cycles.	Use Scenario: Secondary-side transient suppression on Ethernet PHY power and bias rails in telecom base station line cards. IC Role / Device Role / Timing Role: Standoff-rated TVS on +3.3 V and +5 V supply nets feeding Gigabit Ethernet controllers. Use Value: 8.5 V V_WM allows safe operation with 5 V nominal rails while clamping fast transients below IC damage thresholds.

Automotive Power Rail Protection

Industrial Sensor Interface Protection

Use Scenario: Protecting 12 V supply inputs in engine control units against load dump and alternator transients.

IC Role / Device Role / Timing Role: Uni-directional TVS placed between battery rail and system input filter capacitor.

Use Value: Clamps 10/1000 μs surges to ≤14.4 V, preventing damage to downstream PMICs and microcontrollers rated for 16 V absolute max.

Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) in factory automation sensors.

IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt induced lightning or EFT bursts before reaching op-amp front-end.

Use Value: Sub-1 ns response and ≤1.0 μA leakage preserve signal accuracy while blocking >30 kV ESD per IEC 61000-4-2.

Consumer Power Adapter Input

Telecom Line Card Surge Protection

Use Scenario: Input-stage protection on AC/DC adapters subjected to mains-borne surges and switching noise.

IC Role / Device Role / Timing Role: Primary clamping device after bridge rectifier, before bulk capacitor.

Use Value: 500 W rating handles EN 61000-4-5 Level 3 (2 kV line-earth) surges without degradation across 1000+ cycles.

Use Scenario: Secondary-side transient suppression on Ethernet PHY power and bias rails in telecom base station line cards.

IC Role / Device Role / Timing Role: Standoff-rated TVS on +3.3 V and +5 V supply nets feeding Gigabit Ethernet controllers.

Use Value: 8.5 V V_WM allows safe operation with 5 V nominal rails while clamping fast transients below IC damage thresholds.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ8.5A-E3/54	Same V_WM (8.5 V), identical DO-214AC package, but 400 W P_PPM and higher V_C (15.0 V)	Lower surge capacity suits consumer-grade designs where ISO 7637-2 compliance is not required	Select SMAJ8.5A-E3/54 if board space permits SMC footprint and 400 W suffices for IEC 61000-4-5 Level 2
1.5KE8.5A	Same V_WM and V_BR, but DO-201AD package, 1500 W P_PPM, higher I_PPM (123 A), and larger form factor	Higher energy handling targets heavy industrial equipment with frequent high-energy transients	Choose 1.5KE8.5A when legacy DO-201AD layout exists and >500 W surge margin is mandated

Compared with SMAJ8.5A-E3/54 and 1.5KE8.5A, SA8.5HE3/54 uniquely balances AEC-Q101 qualification, DO-15 compactness, and 500 W capability - making it optimal for new automotive and space-constrained industrial designs requiring validated reliability.

Availability

SA8.5HE3/54 is available at Aetrix Electronics and suitable for automotive ECU power protection, industrial sensor interface hardening, and telecom line card surge suppression requiring stable component supply and full traceability.

Supply support for SA8.5HE3/54 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive qualification.

The SAxxA series is part of Vishay's TRANSZORB® TVS family, engineered specifically for robust, standardized transient suppression in harsh environments - targeting ISO 7637-2, IEC 61000-4-2/4-5, and AEC-Q101-compliant systems.

FAQ

What is the clamping voltage of SA8.5HE3/54 at its rated peak pulse current?

The SA8.5HE3/54 has a maximum clamping voltage (V_C) of 14.4 V when subjected to its rated peak pulse current (I_PPM) of 34.7 A under a 10/1000 μs waveform. This value is measured per Figure 7 in the Vishay datasheet 88378 and defines the upper voltage limit imposed on protected circuitry during surge events. The SA8.5HE3/54 maintains this clamping performance across its qualified temperature range and lifetime.

Is SA8.5HE3/54 suitable for automotive applications?

Yes, SA8.5HE3/54 is AEC-Q101 qualified and explicitly rated for automotive use, including engine control modules, body electronics, and ADAS sensor power rails. Its DO-204AC package, 175 °C junction rating, and compliance with ISO 7637-2 transient immunity requirements confirm suitability. The HE3 suffix denotes AEC-Q101 qualification and JESD 201 Class 2 whisker resistance - key for automotive-grade SA8.5HE3/54 deployment.

What does the "HE3/54" suffix mean in SA8.5HE3/54?

The "HE3" suffix indicates RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance; "/54" specifies the preferred packaging code for 13-inch paper tape and reel, with 4000 units per reel. This matches Vishay's ordering convention in document 88378 and confirms the SA8.5HE3/54 is supplied in industry-standard automated assembly format with full automotive traceability.

How does SA8.5HE3/54 differ from bi-directional SA8.5CA variants?

SA8.5HE3/54 is uni-directional with cathode marking and conducts only in reverse breakdown, while SA8.5CA is bi-directional with no polarity marking and clamps in both directions. The SA8.5HE3/54 has lower leakage (1.0 μA vs. 600 μA for SA8.5CA at V_WM) and is intended for DC rail protection; SA8.5CA suits AC-coupled or differential signal lines. Their V_BR and V_C values also differ per datasheet Table 1.

What is the maximum operating temperature for SA8.5HE3/54?

The SA8.5HE3/54 has a maximum junction temperature (T_J) of +175 °C and an operating/storage range of −55 °C to +175 °C. This rating is confirmed in the "Maximum Ratings" table of Vishay datasheet 88378 and enables use in under-hood automotive locations and high-ambient industrial settings. Derating of peak pulse power begins above 25 °C ambient per Figure 2, and the SA8.5HE3/54 must be thermally managed accordingly.

SA8.5HE3/54 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):: 8.5V

Voltage - Breakdown (Min):: 9.44V

Voltage - Clamping (Max) @ Ipp:: 15.9V

Current - Peak Pulse (10/1000µs):: 31.4A

Power - Peak Pulse:: 500W

Power Line Protection:: No

Applications:: -

Capacitance @ Frequency:: -

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Through Hole

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

SA8.5HE3/54 FAQ

1.How can I place an order for SA8.5HE3/54 through Aetrix?

Please submit a Request for Quotation (RFQ) for SA8.5HE3/54 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 SA8.5HE3/54 reliable?

The price and inventory of SA8.5HE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA8.5HE3/54 is usually 5 days.

3.What payment methods are accepted for SA8.5HE3/54?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA8.5HE3/54 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SA8.5HE3/54?

SA8.5HE3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SA8.5HE3/54 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 SA8.5HE3/54?

For technical support, including SA8.5HE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA8.5HE3/54 requirements.

6.How does Aetrix verify that SA8.5HE3/54 is sourced from the original manufacturer or authorized distributors?

All SA8.5HE3/54 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 SA8.5HE3/54 meets industry standards.

7.What is the process for return or replacement of SA8.5HE3/54?

All SA8.5HE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA8.5HE3/54, 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 SA8.5HE3/54 part is unused and in its original packaging.

Return procedure for SA8.5HE3/54:

1.Submit a request within 90 days.

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

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