My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ75AHM3/I
- Part No.:
- SMAJ75AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75AHM3/I.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,372
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ75AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 75 V stand-off voltage (VWM), 83.3–92.1 V breakdown voltage (VBR) at 1 mA, 121 V maximum clamping voltage (VC) at 3.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive ECUs, industrial sensor interfaces, and power supply input stages.
For engineers reviewing the SMAJ75AHM3/I datasheet, SMAJ75AHM3/I pinout, SMAJ75AHM3/I application, or SMAJ75AHM3/I equivalent, key selection criteria include its AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, low incremental surge resistance, and suitability for high-reliability 12 V/24 V automotive and industrial power rail protection where fast response (<1 ns), stable clamping, and MSL Level 1 moisture sensitivity are required.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 75 V), then rapidly avalanches below 1 ns to clamp transients up to 400 W. Its glass-passivated junction ensures stable VBR tolerance and long-term reliability across -55 °C to +150 °C operating range.
The device is rated for 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), exhibits 0.106 %/°C VBR temperature coefficient, and achieves thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads - enabling effective transient energy dissipation without external heatsinking in space-constrained layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 12 V/24 V systems. |
| VBR min/max | 83.3 V / 92.1 V at 1 mA - Tight breakdown window ensures predictable turn-on threshold and minimal variation across production lots. |
| VC @ IPPM | 121 V at 3.3 A - Clamping voltage during 10/1000 μs transient; limits downstream IC stress to safe levels in automotive load-dump scenarios. |
| PPPM | 400 W - Peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| IR @ VWM | 1.0 μA - Ultra-low reverse leakage preserves battery life and avoids false triggering in always-on circuits. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and high-temperature industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount, low-profile package compatible with automated placement and reflow soldering per J-STD-020 MSL Level 1. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on one end. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes clamping circuit when transient exceeds VBR. |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V rail); band-marked end identifies cathode per JEDEC DO-214AC standard. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors - meets stress test requirements for temperature cycling, HTRB, and ESD. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms halogen-free molding compound and lead finish - satisfies EU RoHS Directive 2011/65/EU and automotive material compliance standards. |
| 400 W peak pulse power | Rated for 10/1000 μs waveform at TA = 25 °C; derates to 300 W above 78 V - sufficient for ISO 7637-2 pulse 5a/b (load dump) protection. |
| Fast response time | <1 ns turn-on - clamps transients before sensitive downstream components (e.g., MCU I/O, CAN transceivers) experience overstress. |
| Low incremental surge resistance | Ensures minimal voltage overshoot during high di/dt events - critical for protecting MOSFET gates and precision analog front-ends. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs of engine control units (ECUs) against ISO 7637-2 load dump transients (up to 60 V, 400 ms). IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point, clamping excess energy to ground before reaching LDOs and microcontrollers. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V logic supplies by limiting clamped voltage to ≤121 V while sustaining 400 W surge without degradation. |
Use Scenario: Safeguarding 4–20 mA current loop transmitters and analog sensor outputs (e.g., pressure, temperature) in factory automation PLC modules. IC Role / Device Role / Timing Role: Bidirectional-capable protection element (though SMAJ75AHM3/I is unidirectional, used in DC-biased configurations) guarding against ESD and inductive switching noise on 24 V loop supply lines. Use Value: Maintains signal integrity with <1 μA leakage at 75 V, ensuring mA-level accuracy remains unaffected during normal operation while responding within nanoseconds to 8 kV contact ESD events. |
| DC-DC Converter Input Protection | Telecom Power Supply Surge Suppression |
Use Scenario: Front-end protection for buck converter inputs in telecom base station power modules exposed to lightning-induced surges on -48 V distribution buses. IC Role / Device Role / Timing Role: Primary clamping device placed upstream of input filter capacitors and controller ICs; coordinates with MOVs for multi-stage protection. Use Value: Withstands repetitive 300 W surges above 78 V and provides precise 121 V clamping - reduces stress on downstream ceramic capacitors and enables smaller, more reliable input stage designs. |
Use Scenario: Overvoltage suppression on AC/DC adapter outputs feeding PoE-powered devices and network interface cards in enterprise infrastructure equipment. IC Role / Device Role / Timing Role: Secondary-level TVS on regulated 12 V/5 V output rails, absorbing residual transients that pass through primary AC-side protection. Use Value: Halogen-free HM3 construction supports strict material declarations for data center hardware; 150 °C TJ rating ensures stability during sustained high-load operation in enclosed chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75AHE3/I | Same electrical specs but RoHS-compliant commercial grade (E3), not halogen-free or AEC-Q101 qualified. | Lacks automotive qualification and halogen-free certification; suitable for industrial/commercial PCBs without automotive compliance mandates. | Select SMAJ75AHE3/I only if AEC-Q101 and halogen-free requirements are not enforced in your BOM. |
| SMAJ75A-M3/5A | Identical electrical and mechanical specs; differs only in packaging format (13" reel, 7500 pcs) and base P/N suffix convention. | No functional difference - same HM3-grade die and construction; alternate ordering code for bulk procurement logistics. | Choose SMAJ75A-M3/5A when sourcing large volumes via 13" tape-and-reel for SMT line efficiency. |
Compared with SMAJ75AHM3/I, SMAJ75AHE3/I omits AEC-Q101 validation and halogen-free assurance - reducing cost but excluding automotive use; SMAJ75A-M3/5A offers identical performance in a different reel configuration, enabling flexible manufacturing scale-up without design change.
Availability
SMAJ75AHM3/I is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor nodes, and telecom power supply protection requiring stable component supply, AEC-Q101 compliance, and halogen-free material content.
Supply support for SMAJ75AHM3/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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMAJ series is engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, fast response, and long-term parametric stability are mandatory.
FAQ
What is the clamping voltage of SMAJ75AHM3/I at its rated peak pulse current?
The SMAJ75AHM3/I has a maximum clamping voltage (VC) of 121 V at 3.3 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components see limited overvoltage stress during surge events - a critical parameter for safeguarding 5 V and 3.3 V logic supplies fed from a 12 V or 24 V rail protected by SMAJ75AHM3/I.
Is SMAJ75AHM3/I qualified for automotive applications?
Yes, SMAJ75AHM3/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix in its part number and documented in Vishay's official datasheet (Document Number: 88390, Revision: 09-Jan-2024). This qualification covers stress tests including temperature cycling, high-temperature reverse bias (HTRB), and ESD - making SMAJ75AHM3/I suitable for under-hood and body-control module deployments where reliability under thermal and electrical stress is essential.
What does the "HM3" suffix signify in SMAJ75AHM3/I?
The "HM3" suffix in SMAJ75AHM3/I indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering nomenclature, "H" denotes AEC-Q101 qualification, "M" signifies halogen-free materials, and "3" confirms RoHS compliance - distinguishing it from E3 (RoHS only) or HE3 (AEC-Q101 + RoHS, not halogen-free) variants. This makes SMAJ75AHM3/I compliant with automotive material declarations and environmental regulations.
Can SMAJ75AHM3/I be used in bidirectional protection circuits?
No, SMAJ75AHM3/I is a unidirectional TVS diode, as indicated by the "A" (not "CA") in its part number and confirmed by its single cathode band marking. It conducts only in reverse breakdown - protecting positive-going transients on a positively referenced line. For true bidirectional protection (e.g., AC lines or differential buses), SMAJ75CA variants must be selected; using SMAJ75AHM3/I in bidirectional roles risks failure during negative excursions.
What is the maximum operating temperature for SMAJ75AHM3/I?
The SMAJ75AHM3/I has a maximum junction temperature (TJ max) of +150 °C, as specified in the Absolute Maximum Ratings table of its datasheet. This allows reliable operation in high-temperature environments such as automotive engine compartments or sealed industrial enclosures - provided PCB layout adheres to the recommended 0.2" × 0.2" copper pad area per terminal to maintain thermal resistance at 120 °C/W.
SMAJ75AHM3/I 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 3.3A
- 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)
SMAJ75AHM3/I FAQ
1.How can I place an order for SMAJ75AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75AHM3/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 SMAJ75AHM3/I reliable?
The price and inventory of SMAJ75AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75AHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ75AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75AHM3/I?
SMAJ75AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75AHM3/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 SMAJ75AHM3/I?
For technical support, including SMAJ75AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75AHM3/I requirements.
6.How does Aetrix verify that SMAJ75AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ75AHM3/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 SMAJ75AHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ75AHM3/I?
All SMAJ75AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75AHM3/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 SMAJ75AHM3/I part is unused and in its original packaging.
Return procedure for SMAJ75AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ75AHM3/I Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
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…
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, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
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.
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.
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…
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…
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…
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 …
