Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Vishay General Semiconductor - Diodes Division SMAJ64CAHM3/H

Name: SMAJ64CAHM3/H
Brand: Vishay General Semiconductor - Diodes Division
SKU: SMAJ64CAHM3/H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SMAJ64CAHM3/H

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-214AC, SMA

Datasheet:: SMAJ64CAHM3/H.pdf

Description:: TVS DIODE 64VWM 103VC DO214AC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:7,710

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SMAJ64CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 64 V standoff voltage (V_WM), 71.1–78.6 V breakdown voltage (V_BR) at 1 mA, 103 V maximum clamping voltage (V_C) at 3.9 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.

For engineers reviewing the SMAJ64CAHM3/H datasheet, SMAJ64CAHM3/H pinout, SMAJ64CAHM3/H application, or SMAJ64CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.

Technical Context

This device operates as a voltage-clamped surge protector with symmetrical reverse/forward conduction behavior due to its bidirectional construction. It responds within picoseconds to transients induced by inductive switching or ESD events, maintaining low incremental surge resistance and stable clamping performance up to 150 °C junction temperature.

The SMAJ64CAHM3/H uses a glass-passivated silicon junction and meets MSL level 1 per J-STD-020 with 260 °C reflow peak. Its thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling reliable operation under repetitive surge conditions when mounted per recommended pad layout.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	64 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working range for protected circuit.
V_BR min/max	71.1 V / 78.6 V at 1 mA - Breakdown threshold range; ensures consistent clamping onset across production units.
V_C @ I_PPM	103 V at 3.9 A - Clamped voltage during 10/1000 μs surge; determines maximum stress on downstream components.
P_PPM	400 W - Peak pulse power handling with 10/1000 μs waveform; supports robust protection against common lightning/inductive spikes.
I_FSM	40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates survivability under severe overvoltage events.
T_J max	+150 °C - Maximum junction temperature; enables use in under-hood automotive and high-temperature industrial environments.
Package	SMA (DO-214AC) - Surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with standard SMT pick-and-place.

Pinout & Package

Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity-unmarked for bidirectional operation.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Terminal A	One side of symmetrical PN junction; connects to line being protected without polarity constraint.
Cathode	Terminal K	Other side of symmetrical PN junction; functionally identical to Anode in bidirectional configuration; no band marking.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, ADAS, and body electronics.
Halogen-free & RoHS-compliant	Meets environmental compliance requirements for global OEM supply chains without compromising surge performance.
400 W peak pulse power	Handles high-energy transients typical of 12 V/24 V vehicle systems and industrial PLC I/O modules without degradation.
Low clamping ratio (V_C/V_WM = 1.61)	Minimizes overvoltage exposure to protected ICs while maintaining margin above normal operating voltage.
MSL Level 1 moisture sensitivity	Enables direct placement after dry pack opening without baking; reduces manufacturing overhead in high-volume SMT lines.

Applications

Automotive Power Supply Protection	Industrial Sensor Interface Protection
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across input rails upstream of DC-DC converters and microcontrollers. Use Value: Limits rail voltage to ≤103 V during 400 W surges, preventing latch-up or gate oxide damage in downstream logic and power stages.	Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between signal line and ground, with fast response preserving signal integrity. Use Value: Clamps ±64 V transients to safe levels within <1 ns, avoiding false triggering or ADC saturation in precision measurement circuits.
Telecom Line Interface Protection	Consumer Power Adapter Input Protection
Use Scenario: Safeguarding Ethernet PHY or RS-485 transceivers connected to unshielded field wiring exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on differential pair inputs, coordinated with secondary GDT or MOV stages. Use Value: Absorbs up to 400 W of coupled energy while holding differential voltage below receiver absolute maximum ratings.	Use Scenario: Input-stage surge suppression in wall-mounted AC-DC adapters for smart home devices. IC Role / Device Role / Timing Role: First-line defense against line-to-ground and line-to-line transients entering via IEC 61000-4-5 compliant surge tests. Use Value: Maintains 64 V standoff during normal operation and clamps to 103 V during 10/1000 μs surges, ensuring compliance with UL 62368-1.

Automotive Power Supply Protection

Industrial Sensor Interface Protection

Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients.

IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across input rails upstream of DC-DC converters and microcontrollers.

Use Value: Limits rail voltage to ≤103 V during 400 W surges, preventing latch-up or gate oxide damage in downstream logic and power stages.

Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation.

IC Role / Device Role / Timing Role: Low-capacitance TVS connected between signal line and ground, with fast response preserving signal integrity.

Use Value: Clamps ±64 V transients to safe levels within <1 ns, avoiding false triggering or ADC saturation in precision measurement circuits.

Telecom Line Interface Protection

Consumer Power Adapter Input Protection

Use Scenario: Safeguarding Ethernet PHY or RS-485 transceivers connected to unshielded field wiring exposed to lightning-induced surges.

IC Role / Device Role / Timing Role: Primary-level TVS on differential pair inputs, coordinated with secondary GDT or MOV stages.

Use Value: Absorbs up to 400 W of coupled energy while holding differential voltage below receiver absolute maximum ratings.

Use Scenario: Input-stage surge suppression in wall-mounted AC-DC adapters for smart home devices.

IC Role / Device Role / Timing Role: First-line defense against line-to-ground and line-to-line transients entering via IEC 61000-4-5 compliant surge tests.

Use Value: Maintains 64 V standoff during normal operation and clamps to 103 V during 10/1000 μs surges, ensuring compliance with UL 62368-1.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ64CAHE3/H	Same electrical specs and AEC-Q101 qualification, but RoHS-compliant without halogen-free designation.	Acceptable where halogen-free requirement is not mandated by end-customer specification.	Select SMAJ64CAHE3/H if environmental compliance allows standard RoHS without halogen restriction.
SMBJ64CAHM3	Higher 600 W peak pulse power rating, same V_WM/V_C, larger SMB (DO-214AA) package with higher thermal mass.	Better suited for higher-energy surge environments where board space permits larger footprint.	Choose SMBJ64CAHM3 when system-level surge test levels exceed IEC 61000-4-5 Level 4 and PCB layout accommodates SMB outline.

Compared with SMAJ64CAHE3/H, the SMAJ64CAHM3/H adds halogen-free compliance without sacrificing AEC-Q101 qualification or clamping performance; versus SMBJ64CAHM3, it trades 50 % lower peak power for 30 % smaller footprint and identical mounting compatibility with dense automotive PCBs.

Availability

SMAJ64CAHM3/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface design, and telecom line protection requiring stable component supply and long-term lifecycle support.

Supply support for SMAJ64CAHM3/H 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 and application-specific optimization.

The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where compact size, AEC-Q101 validation, and repeatable clamping are critical.

FAQ

What does the 'HM3' suffix indicate in SMAJ64CAHM3/H?

The 'HM3' suffix in SMAJ64CAHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. The 'H' indicates the packaging format (7" tape and reel), and '/H' at the end specifies the revision code per Vishay's ordering nomenclature. This distinguishes it from non-halogen-free variants like SMAJ64CAHE3/H and confirms suitability for automotive-grade production.

Is SMAJ64CAHM3/H bidirectional, and how does that affect circuit placement?

Yes, SMAJ64CAHM3/H is a bidirectional TVS diode, meaning it provides symmetrical clamping in both polarities without cathode band marking. This allows placement across any two points needing transient protection - such as power-to-ground, signal-to-ground, or differential pairs - without orientation constraints, simplifying layout and reducing BOM complexity compared to unidirectional alternatives.

What is the maximum clamping voltage of SMAJ64CAHM3/H, and under what test condition is it specified?

The maximum clamping voltage of SMAJ64CAHM3/H is 103 V, measured at a peak pulse current (I_PPM) of 3.9 A using the standardized 10/1000 μs double-exponential waveform. This value represents the upper limit of voltage seen by protected circuitry during worst-case surge events and is guaranteed across temperature and production lot variations per Vishay's datasheet specifications.

Can SMAJ64CAHM3/H be used in place of SMAJ64A in a design?

No - SMAJ64CAHM3/H is bidirectional, while SMAJ64A is unidirectional and features a cathode band for polarity-sensitive placement. Substituting them requires verifying circuit topology: SMAJ64A only protects against negative-going transients on anode-grounded configurations, whereas SMAJ64CAHM3/H protects both polarities. Using SMAJ64CAHM3/H in a unidirectional design may increase leakage or alter biasing in sensitive analog paths.

Does SMAJ64CAHM3/H meet automotive qualification standards?

Yes, SMAJ64CAHM3/H is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per JESD22-A114. This certification confirms its suitability for automotive applications such as body control modules, infotainment power supplies, and ADAS sensor interfaces where reliability under thermal and electrical stress is mandatory.

SMAJ64CAHM3/H Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Package/Case:: DO-214AC, SMA

Series:: TransZorb®

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Type:: Zener

Unidirectional Channels:: -

Bidirectional Channels:: 1

Voltage - Reverse Standoff (Typ):: 64V

Voltage - Breakdown (Min):: 71.1V

Voltage - Clamping (Max) @ Ipp:: 103V

Current - Peak Pulse (10/1000µs):: 3.9A

Power - Peak Pulse:: 400W

Power Line Protection:: No

Applications:: Telecom

Capacitance @ Frequency:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AC (SMA)

SMAJ64CAHM3/H FAQ

1.How can I place an order for SMAJ64CAHM3/H through Aetrix?

Please submit a Request for Quotation (RFQ) for SMAJ64CAHM3/H 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 SMAJ64CAHM3/H reliable?

The price and inventory of SMAJ64CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ64CAHM3/H is usually 5 days.

3.What payment methods are accepted for SMAJ64CAHM3/H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64CAHM3/H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMAJ64CAHM3/H?

SMAJ64CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMAJ64CAHM3/H 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 SMAJ64CAHM3/H?

For technical support, including SMAJ64CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64CAHM3/H requirements.

6.How does Aetrix verify that SMAJ64CAHM3/H is sourced from the original manufacturer or authorized distributors?

All SMAJ64CAHM3/H 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 SMAJ64CAHM3/H meets industry standards.

7.What is the process for return or replacement of SMAJ64CAHM3/H?

All SMAJ64CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64CAHM3/H, 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 SMAJ64CAHM3/H part is unused and in its original packaging.

Return procedure for SMAJ64CAHM3/H:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-11 Comparator Circuit: Voltage Thresholds, Op-Amp Differences, LM393 and Practical Design

Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …