My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ7.5AHM3/H
- Part No.:
- SMAJ7.5AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5AHM3/H.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,512
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ7.5AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 7.5 V stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR) at 1.0 mA test current, 12.9 V maximum clamping voltage (VC) at 31.0 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor protection and industrial I/O interface circuits.
For engineers reviewing the SMAJ7.5AHM3/H datasheet, SMAJ7.5AHM3/H pinout, SMAJ7.5AHM3/H application, or SMAJ7.5AHM3/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, low clamping ratio (VC/VBR ≈ 1.55), and thermal resistance (RθJA = 120 °C/W) under standard PCB pad layout.
Technical Context
This TVS diode operates as a fast-acting shunt protector: when reverse voltage exceeds VBR, it avalanches to clamp transient energy within nanoseconds. Its glass-passivated junction ensures stable breakdown and low leakage (<100 μA at VWM), while the SMA package supports automated placement and meets MSL level 1 reflow (260 °C peak).
The device delivers 400 W peak pulse power up to 78 V; above that threshold, derating applies (300 W). It is rated for -55 °C to +150 °C operating junction temperature, with 40 A non-repetitive forward surge capability (8.3 ms half-sine), making it suitable for inductive load switching events in automotive ECUs and industrial PLC inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - maximum continuous reverse operating voltage before significant leakage; defines safe DC/AC working margin. |
| VBR (min/max) | 8.33 V / 9.21 V at 1.0 mA - precise avalanche initiation range; ensures consistent turn-on across production lots. |
| VC @ IPPM | 12.9 V at 31.0 A - clamped voltage during 10/1000 μs transient; determines protected circuit's maximum stress level. |
| PPPM | 400 W - peak transient energy absorption capacity; validated per IEC 61000-4-5 Level 4 surge immunity testing. |
| ID @ VWM | <100 μA - ultra-low reverse leakage; preserves signal integrity and minimizes standby power loss in battery-powered systems. |
| TJ max. | +150 °C - extended junction temperature rating enables use in under-hood automotive environments and high-power industrial enclosures. |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal design; supports J-STD-020 reflow. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; cathode indicated by band marking on unidirectional types. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for full 400 W rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or common return path; forms current path during reverse-biased clamping event. |
| Cathode | Protected line input | Connected to vulnerable IC pin or trace; conducts avalanche current to Anode when VIN > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness - required for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant (HM3) | Meets JEDEC J-STD-201 Class 2 whisker resistance and global environmental regulations without compromising solderability or thermal performance. |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy surges from relay coil collapse or load dump without degradation - critical for 12 V/24 V vehicle subsystems. |
| Fast response time & low clamping ratio | Sub-nanosecond turn-on and VC/VBR ≈ 1.55 ensure minimal overvoltage exposure to downstream MOSFETs, microcontrollers, and CAN transceivers. |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking; compatible with standard SMT reflow profiles up to 260 °C peak temperature. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
|
Use Scenario: Protecting analog output pins of pressure/temperature sensors in engine bay modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role: Unidirectional shunt clamping element placed between sensor output and ground. Use Value: Limits transient voltage to ≤12.9 V, preventing damage to 3.3 V/5 V ADC inputs and ensuring signal fidelity during 100 V/50 ms surges. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers (PLCs) connected to 24 V field wiring subject to inductive kickback. IC Role / Device Role: Reverse-biased TVS on each input line, referenced to common ground plane. Use Value: Absorbs 400 W surge energy without latch-up, maintaining functional safety integrity per IEC 61000-4-4 Level 4 requirements. |
| USB Power Line Protection | DC-DC Converter Input Stage |
|
Use Scenario: Clamping voltage spikes on VBUS lines of USB-C ports in automotive infotainment head units during hot-plug events. IC Role / Device Role: Standoff-rated TVS between VBUS and GND, sized to avoid conduction during normal 5 V operation. Use Value: Blocks transients >9.21 V while drawing <100 μA at 5 V - preserving bus regulation and avoiding false overvoltage shutdowns. |
Use Scenario: Suppressing switching noise and input surges at the VIN pin of buck converters powering ADAS camera modules. IC Role / Device Role: Primary front-end transient suppressor upstream of input capacitor and controller IC. Use Value: Maintains converter stability by limiting input rail excursions to ≤12.9 V during 31 A surge events, preventing UVLO faults and gate driver disruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5AHE3/H | Same electrical specs but RoHS-compliant (E3), not halogen-free; lacks JESD201 Class 2 whisker resistance certification. | Suitable for commercial/industrial designs where halogen-free requirement is absent; not approved for automotive AEC-Q101 programs. | Select SMAJ7.5AHM3/H when halogen-free compliance and automotive qualification are mandatory. |
| SMBJ7.5A-H | Higher 600 W PPPM rating in SMB (DO-214AA) package; larger footprint (4.6 mm × 3.9 mm vs. SMA's 4.5 mm × 2.8 mm); RθJA = 80 °C/W. | Better thermal performance and surge margin, but incompatible with SMA footprints; requires PCB redesign. | Choose SMBJ7.5A-H only if higher power handling justifies layout change and space availability permits larger package. |
Compared with SMAJ7.5AHE3/H, SMAJ7.5AHM3/H adds halogen-free construction and AEC-Q101 validation without sacrificing clamping performance; versus SMBJ7.5A-H, it trades 200 W pulse power for compact size and drop-in compatibility in space-constrained automotive modules.
Availability
SMAJ7.5AHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and USB power line surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMAJ7.5AHM3/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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series targets cost-sensitive, high-volume transient suppression needs in automotive, industrial, and computing systems - engineered for rapid response, repeatable clamping, and robust thermal behavior in real-world PCB layouts.
FAQ
What is the clamping voltage of SMAJ7.5AHM3/H at its rated peak pulse current?
The SMAJ7.5AHM3/H has a maximum clamping voltage (VC) of 12.9 V at its rated peak pulse current (IPPM) of 31.0 A, measured with a 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in Vishay's Document Number 88390, page 2. The SMAJ7.5AHM3/H maintains this clamping performance across its qualified operating temperature range (-55 °C to +150 °C).
Is SMAJ7.5AHM3/H qualified for automotive applications?
Yes, SMAJ7.5AHM3/H is AEC-Q101 qualified, as indicated by the "HM3" suffix - denoting halogen-free, RoHS-compliant, and automotive-grade reliability validation. It undergoes stress testing including temperature cycling, high-temperature reverse bias (HTRB), and mechanical shock per AEC-Q101 standards. This makes SMAJ7.5AHM3/H suitable for under-hood and chassis-mounted modules where long-term reliability under thermal and vibration stress is critical.
How does the HM3 suffix differ from E3 or HE3 in the SMAJ7.5A family?
The HM3 suffix on SMAJ7.5AHM3/H specifies halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance - distinct from E3 (RoHS only) and HE3 (RoHS + AEC-Q101, but not halogen-free). All three share identical electrical parameters, but only HM3 and HE3 meet automotive qualification; HM3 adds halogen-free compliance required by certain OEM specifications. SMAJ7.5AHM3/H thus satisfies both environmental and automotive reliability mandates simultaneously.
What is the thermal resistance of SMAJ7.5AHM3/H, and how does it affect PCB layout?
SMAJ7.5AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To achieve its full 400 W peak pulse rating, the PCB must implement these minimum pad dimensions and avoid excessive copper isolation. Reducing pad area increases RθJA, derating pulse power - so SMAJ7.5AHM3/H layout must follow Vishay's recommended mounting footprint in Document 88390, page 5.
Can SMAJ7.5AHM3/H be used in bidirectional configurations?
No, SMAJ7.5AHM3/H is a unidirectional TVS diode, as confirmed by its part number suffix "A" (not "CA") and cathode band marking. Bidirectional operation requires the "CA" variant (e.g., SMAJ7.5CA), which exhibits symmetrical breakdown in both polarities. Using SMAJ7.5AHM3/H in reverse-biased signal paths without proper polarity alignment will result in forward conduction and potential failure. Always verify polarity orientation during placement.
SMAJ7.5AHM3/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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 31A
- 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)
SMAJ7.5AHM3/H FAQ
1.How can I place an order for SMAJ7.5AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5AHM3/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 SMAJ7.5AHM3/H reliable?
The price and inventory of SMAJ7.5AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5AHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ7.5AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5AHM3/H?
SMAJ7.5AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5AHM3/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 SMAJ7.5AHM3/H?
For technical support, including SMAJ7.5AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5AHM3/H requirements.
6.How does Aetrix verify that SMAJ7.5AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5AHM3/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 SMAJ7.5AHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ7.5AHM3/H?
All SMAJ7.5AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5AHM3/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 SMAJ7.5AHM3/H part is unused and in its original packaging.
Return procedure for SMAJ7.5AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.5AHM3/H 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 …
