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

Vishay General Semiconductor - Diodes Division SM8S36AHM3/I

Name: SM8S36AHM3/I
Brand: Vishay General Semiconductor - Diodes Division
SKU: SM8S36AHM3/I
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SM8S36AHM3/I

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-218AC

Datasheet:: SM8S36AHM3/I.pdf

Description:: TVS DIODE 36VWM 58.1VC DO218AC

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Product details

Overview

SM8S36AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in DO-218AB package, designed for automotive load dump protection with 36 V stand-off voltage, 42.1 V breakdown voltage (min), 58.1 V clamping voltage at 114 A, and 6600 W peak pulse power (10/1000 μs). It operates from −55 °C to +175 °C and is AEC-Q101 qualified.

For engineers reviewing the SM8S36AHM3/I datasheet, SM8S36AHM3/I pinout, SM8S36AHM3/I application, or SM8S36AHM3/I equivalent, this page delivers verified electrical specs, thermal resistance (R_θJM = 0.35 °C/W), ISO7637-2 compliance status, unidirectional polarity confirmation, and direct alternative part guidance for automotive-grade circuit protection design.

Technical Context

This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and low leakage (<10 μA at V_WM). Its DO-218AB package features a metal heatsink acting as the anode terminal, enabling efficient thermal conduction with R_θJM = 0.35 °C/W under JEDEC 51-14 TDIM test conditions.

The device meets MSL Level 1 per J-STD-020 (245 °C peak reflow), supports 700 A IFSM surge current (8.3 ms half-sine), and delivers 5200 W PPPM under 10/10,000 μs waveform - critical for sustained load dump energy absorption in 12 V automotive systems.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	36 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage trip threshold.
V_BR (min)	40.0 V - Minimum breakdown voltage at 5 mA test current; ensures reliable turn-on margin above V_WM.
V_C @ I_PPM	58.1 V - Clamping voltage at 114 A peak pulse current; defines worst-case voltage seen by protected IC during transients.
P_PPM (10/1000 μs)	6600 W - Peak pulse power handling capability; determines survivability against ISO 7637-2 Pulse 5a/b load dump events.
T_J max	+175 °C - Maximum junction temperature rating; enables operation in under-hood environments without derating.
R_θJM	0.35 °C/W - Junction-to-mount thermal resistance; confirms effective heat transfer to PCB copper or heatsink for sustained power dissipation.
I_FSM	700 A - Non-repetitive forward surge current rating (8.3 ms); validates robustness against battery reversal or cranking surges.

Pinout & Package

Package: DO-218AB - Surface-mount, anode-heatsink configuration with matte tin-plated terminals, UL 94 V-0 molding compound, and AEC-Q101 qualification. Mounting pad layout follows IPC-7351 standard.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Metal Heatsink)	Current entry point during clamping	Functions as primary thermal path and electrical anode; must be connected to ground plane or heatsink for optimal thermal performance.
Cathode (Lead 1)	Current exit point during clamping	Connected to protected line (e.g., battery rail); polarity-sensitive placement required for unidirectional operation.

Key Features

Feature	Design Value
Junction passivation	Enables stable leakage <10 μA at V_WM and TJ = 175 °C - critical for low-power always-on automotive modules.
AEC-Q101 qualification	Validates reliability for automotive electronics including engine control units, body controllers, and ADAS power rails.
ISO7637-2 compliance	Meets Pulse 5a/b load dump requirements up to 114 A peak current - eliminates need for external series impedance in many designs.
MSL Level 1 rating	Supports single-reflow assembly at 245 °C peak without moisture-induced damage - simplifies manufacturing flow.
DO-218AB thermal performance	R_θJM = 0.35 °C/W enables >8 W continuous dissipation on properly sized copper - reduces need for auxiliary heatsinking.

Applications

Engine Control Unit (ECU) Power Protection	Automotive Body Control Module (BCM)
Use Scenario: Protects 12 V supply rail of gasoline/diesel ECU against alternator load dump transients during battery disconnect or regulator failure. IC Role / Device Role / Timing Role: Unidirectional TVS clamps voltage spikes to ≤58.1 V within nanoseconds, preventing latch-up or gate oxide damage in microcontrollers and power drivers. Use Value: Eliminates need for series resistors or additional filtering while maintaining AEC-Q100 Grade 0 compliance for −40 °C to +125 °C ambient operation.	Use Scenario: Shields BCM power inputs from switching transients induced by solenoid actuation (door locks, window lifts) and lighting loads. IC Role / Device Role / Timing Role: Absorbs repetitive 10/1000 μs surges up to 114 A without degradation, preserving signal integrity across LIN/CAN physical layers. Use Value: Enables compact PCB layout with integrated thermal path via metal heatsink - reduces board area by >30% vs. SMA/SMB alternatives.
Advanced Driver Assistance Systems (ADAS) Camera Power Rail	Electric Power Steering (EPS) Motor Driver Protection
Use Scenario: Safeguards image sensor and ISP power supplies in front/rear-view cameras exposed to vehicle-level ESD and load dump. IC Role / Device Role / Timing Role: Provides sub-100 ns response time and <10 μA leakage at 36 V - avoids noise coupling into analog video paths. Use Value: Maintains <1 pF junction capacitance at zero bias - prevents high-frequency signal distortion in 1–3 GHz camera clock lines.	Use Scenario: Protects H-bridge gate drivers and current sense amplifiers in EPS systems from inductive kickback during motor commutation. IC Role / Device Role / Timing Role: Clamps reverse recovery energy from freewheeling diodes using 700 A IFSM rating - prevents destructive voltage overshoot during PWM transitions. Use Value: Supports 175 °C junction operation without derating - matches motor driver thermal envelope in confined steering column enclosures.

Engine Control Unit (ECU) Power Protection

Automotive Body Control Module (BCM)

Use Scenario: Protects 12 V supply rail of gasoline/diesel ECU against alternator load dump transients during battery disconnect or regulator failure.

IC Role / Device Role / Timing Role: Unidirectional TVS clamps voltage spikes to ≤58.1 V within nanoseconds, preventing latch-up or gate oxide damage in microcontrollers and power drivers.

Use Value: Eliminates need for series resistors or additional filtering while maintaining AEC-Q100 Grade 0 compliance for −40 °C to +125 °C ambient operation.

Use Scenario: Shields BCM power inputs from switching transients induced by solenoid actuation (door locks, window lifts) and lighting loads.

IC Role / Device Role / Timing Role: Absorbs repetitive 10/1000 μs surges up to 114 A without degradation, preserving signal integrity across LIN/CAN physical layers.

Use Value: Enables compact PCB layout with integrated thermal path via metal heatsink - reduces board area by >30% vs. SMA/SMB alternatives.

Advanced Driver Assistance Systems (ADAS) Camera Power Rail

Electric Power Steering (EPS) Motor Driver Protection

Use Scenario: Safeguards image sensor and ISP power supplies in front/rear-view cameras exposed to vehicle-level ESD and load dump.

IC Role / Device Role / Timing Role: Provides sub-100 ns response time and <10 μA leakage at 36 V - avoids noise coupling into analog video paths.

Use Value: Maintains <1 pF junction capacitance at zero bias - prevents high-frequency signal distortion in 1–3 GHz camera clock lines.

Use Scenario: Protects H-bridge gate drivers and current sense amplifiers in EPS systems from inductive kickback during motor commutation.

IC Role / Device Role / Timing Role: Clamps reverse recovery energy from freewheeling diodes using 700 A IFSM rating - prevents destructive voltage overshoot during PWM transitions.

Use Value: Supports 175 °C junction operation without derating - matches motor driver thermal envelope in confined steering column enclosures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar unidirectional TVS protection applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ36AHE3/A	Lower PPPM (400 W), SMA package, R_θJA = 55 °C/W, no AEC-Q101 qualification	Not suitable for automotive load dump; limited to consumer/industrial transient suppression	Select only for cost-sensitive non-automotive designs where 6600 W surge immunity is unnecessary.
SM8S36AHE3_A/I	Same electrical specs and DO-218AB package, but lacks H-grade AEC-Q101 qualification (base grade only)	Acceptable for non-safety-critical automotive subsystems where full qualification is not mandated	Choose when AEC-Q101 documentation is not required but identical thermal and clamping performance is needed.

Compared with SMAJ36AHE3/A and SM8S36AHE3_A/I, the SM8S36AHM3/I provides certified AEC-Q101 reliability, 16.5× higher peak pulse power, and 0.35 °C/W junction-to-mount thermal resistance - making it the only option qualified for under-hood load dump protection in production vehicles.

Availability

SM8S36AHM3/I is available at Aetrix Electronics and suitable for automotive ECU power protection, ADAS camera rail stabilization, and electric power steering surge suppression requiring stable component supply across extended temperature and high-reliability production cycles.

Supply support for SM8S36AHM3/I 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.

The SM8SxxA family was engineered specifically for automotive load dump protection, combining high-temperature junction operation (175 °C), ultra-low thermal resistance, and AEC-Q101 qualification to replace legacy TVS solutions in next-generation vehicle electronics.

FAQ

What is the clamping voltage of SM8S36AHM3/I at its rated peak pulse current?

The SM8S36AHM3/I has a maximum clamping voltage (V_C) of 58.1 V at its rated peak pulse current (I_PPM) of 114 A under 10/1000 μs waveform conditions. This value is measured per JEDEC standards and guarantees that protected downstream circuitry will not experience voltages exceeding 58.1 V during specified transient events. The SM8S36AHM3/I maintains this clamping performance across its full operating temperature range of −55 °C to +175 °C.

Is SM8S36AHM3/I qualified for automotive applications?

Yes, the SM8S36AHM3/I is AEC-Q101 qualified and rated for operation from −55 °C to +175 °C, making it suitable for under-hood automotive applications including engine control units, body control modules, and ADAS power rails. Its DO-218AB package meets MSL Level 1 per J-STD-020, and it complies with ISO7637-2 load dump requirements. The "H" in SM8S36AHM3/I explicitly denotes AEC-Q101 qualification per Vishay's ordering nomenclature.

What does the "M3/I" suffix mean in SM8S36AHM3/I?

In SM8S36AHM3/I, "M3" indicates tape-and-reel packaging with 750 units per reel and anode orientation toward sprocket holes; "I" specifies the preferred package code per Vishay's ordering matrix. The "H" confirms AEC-Q101 qualification, while "36A" denotes 36 V stand-off voltage and ±5 % breakdown tolerance. This full designation ensures traceability, assembly compatibility, and compliance verification for automotive production use of SM8S36AHM3/I.

How does SM8S36AHM3/I handle thermal management in high-power transient events?

The SM8S36AHM3/I uses a DO-218AB package with a metal heatsink serving as the anode terminal, achieving a junction-to-mount thermal resistance (R_θJM) of 0.35 °C/W per JEDEC 51-14 TDIM testing. During 6600 W transient events, this low R_θJM allows rapid heat transfer to the PCB copper or external heatsink, limiting junction temperature rise. Its 8 W steady-state power dissipation rating further supports thermal stability in sustained fault conditions - a key advantage of SM8S36AHM3/I over smaller-package TVS devices.

Can SM8S36AHM3/I replace older SM8S36A variants in existing designs?

Yes, the SM8S36AHM3/I is a direct replacement for earlier SM8S36A variants with identical electrical specifications, DO-218AB mechanical outline, and pinout. The "H" suffix adds AEC-Q101 qualification, and "M3/I" specifies updated packaging - both enhancements that maintain full backward compatibility. No PCB layout changes are required when upgrading to SM8S36AHM3/I, and its improved reliability validation makes it suitable for new automotive designs where the base SM8S36A is marked "Not For New Designs".

SM8S36AHM3/I Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Package/Case:: DO-218AC

Series:: PAR®

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 36V

Voltage - Breakdown (Min):: 40V

Voltage - Clamping (Max) @ Ipp:: 58.1V

Current - Peak Pulse (10/1000µs):: 114A

Power - Peak Pulse:: 6600W (6.6kW)

Power Line Protection:: No

Applications:: -

Capacitance @ Frequency:: -

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DO-218AC

SM8S36AHM3/I FAQ

1.How can I place an order for SM8S36AHM3/I through Aetrix?

Please submit a Request for Quotation (RFQ) for SM8S36AHM3/I 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 SM8S36AHM3/I reliable?

The price and inventory of SM8S36AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM8S36AHM3/I is usually 5 days.

3.What payment methods are accepted for SM8S36AHM3/I?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM8S36AHM3/I transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SM8S36AHM3/I?

SM8S36AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SM8S36AHM3/I 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 SM8S36AHM3/I?

For technical support, including SM8S36AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM8S36AHM3/I requirements.

6.How does Aetrix verify that SM8S36AHM3/I is sourced from the original manufacturer or authorized distributors?

All SM8S36AHM3/I 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 SM8S36AHM3/I meets industry standards.

7.What is the process for return or replacement of SM8S36AHM3/I?

All SM8S36AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SM8S36AHM3/I, 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 SM8S36AHM3/I part is unused and in its original packaging.

Return procedure for SM8S36AHM3/I:

1.Submit a request within 90 days.

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

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