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Vishay General Semiconductor - Diodes Division SMAJ7.5AHE3_A/I
- Part No.:
- SMAJ7.5AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5AHE3_A/I.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,482
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Product details
Overview
SMAJ7.5AHE3_A/I 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ7.5AHE3_A/I datasheet, SMAJ7.5AHE3_A/I pinout, SMAJ7.5AHE3_A/I application, or SMAJ7.5AHE3_A/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 12.9 V clamping performance at 31 A surge, thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT assembly on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal bias it presents high impedance (>100 μA leakage at 7.5 V), then avalanches within picoseconds when transient voltage exceeds VBR to clamp the line at ≤12.9 V. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance, critical for repetitive transient suppression in 12 V automotive subsystems.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and is qualified to AEC-Q101 - confirming robustness for under-hood and powertrain applications where thermal cycling and mechanical shock are present.
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 - guaranteed avalanche initiation range; ensures predictable turn-on across temperature and lot variation. |
| VC @ IPPM | 12.9 V at 31.0 A - clamped voltage during 10/1000 μs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W - peak transient energy absorption capability; supports protection against ISO 7637-2 Pulse 1/2a/5a in automotive environments. |
| ID @ VWM | 100 μA - reverse leakage at rated stand-off; low enough to avoid loading 7.5 V logic or sensor supply rails. |
| TJ max | +150 °C - maximum junction temperature; enables use in high-ambient engine bay or industrial motor drive locations. |
| RθJA | 120 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" pads; informs derating needed for sustained power dissipation. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads; cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge or ESD events. |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., 12 V rail or signal input); initiates clamping when voltage exceeds VBR relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock - suitable for engine control, body electronics, and ADAS sensors. |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients such as load dump (ISO 16750-2) and inductive switching spikes without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on downstream components - critical for protecting 5 V or 3.3 V logic interfaced via level shifters or buffers. |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free SMT reflow profiles without preconditioning or special handling. |
| Glass passivated junction | Ensures stable VBR over time and temperature, low leakage, and immunity to moisture-induced parameter drift. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery-fed microcontroller power input in vehicle body control module exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VCC and GND to clamp transients above 7.5 V before they reach LDO or MCU VDD pins. Use Value: Limits voltage to ≤12.9 V during 31 A surges, preventing latch-up or oxide damage in 3.3 V/5 V logic while maintaining system uptime. |
Use Scenario: Analog output line of a pressure sensor in factory automation PLC I/O module subject to cable ESD and relay contact bounce. IC Role / Device Role / Timing Role: TVS connected from signal line to ground to suppress ±8 kV contact ESD (IEC 61000-4-2) and 100 V/1 μs fast transients. Use Value: Sub-100 ps response ensures clamping occurs before sensor amplifier input stage is overstressed, preserving measurement accuracy and longevity. |
| Consumer USB Port Surge Protection | DC Motor Drive Flyback Suppression |
|
Use Scenario: VBUS line of USB 2.0 port in smart home gateway exposed to hot-plug transients and nearby lightning-induced coupling. IC Role / Device Role / Timing Role: Unidirectional TVS placed inline on VBUS to absorb 400 W surges while allowing normal 5 V operation with <100 μA leakage. Use Value: Prevents USB controller reset or PHY damage during repeated plug/unplug cycles in noisy residential electrical environments. |
Use Scenario: Freewheeling path across brushed DC motor terminals in robotic actuator, suppressing inductive kickback during PWM commutation. IC Role / Device Role / Timing Role: TVS mounted across motor terminals to clamp flyback voltage spikes to ≤12.9 V, protecting H-bridge MOSFETs from avalanche failure. Use Value: Enables reliable 20 kHz PWM switching without snubber RC networks, reducing BOM count and board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5A-E3/61 | Same electrical specs and SMA package, but commercial-grade (non-AEC-Q101) and RoHS-compliant only (no halogen-free claim). | Lacks automotive qualification; suitable for consumer or industrial non-safety-critical designs with lower reliability requirements. | Select when AEC-Q101 is not mandated and cost sensitivity outweighs long-term automotive validation needs. |
| SMAJ7.5AHE3_A/H | Identical electrical and qualification specs, differing only in packaging: 7" tape-and-reel (1800 pcs) vs. 13" reel (7500 pcs) for SMAJ7.5AHE3_A/I. | No functional difference; choice depends solely on production volume, feeder compatibility, and inventory planning. | Choose SMAJ7.5AHE3_A/H for low-to-mid volume builds or prototyping; SMAJ7.5AHE3_A/I for high-volume SMT lines requiring extended reel life. |
Compared with SMAJ7.5A-E3/61, SMAJ7.5AHE3_A/I adds AEC-Q101 qualification and halogen-free compliance - essential for Tier 1 automotive supply chains - while SMAJ7.5AHE3_A/H offers identical performance in smaller reel format, enabling flexibility in manufacturing scale and changeover frequency.
Availability
SMAJ7.5AHE3_A/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, USB VBUS surge suppression, and DC motor flyback clamping requiring stable component supply across multi-year production cycles.
Supply support for SMAJ7.5AHE3_A/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, TVS devices, and optoelectronics with emphasis on reliability, precision, and automotive-grade qualification.
The SMAJ series was developed specifically for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMAJ7.5AHE3_A/I at its rated peak pulse current?
The SMAJ7.5AHE3_A/I has a maximum clamping voltage (VC) of 12.9 V at its rated peak pulse current (IPPM) of 31.0 A, measured using the standardized 10/1000 μs double-exponential surge waveform. This value is guaranteed across temperature and process variation, ensuring downstream ICs see no more than 12.9 V during transient events - critical for safeguarding 5 V or 3.3 V logic interfaces powered from a 7.5 V nominal rail.
Is SMAJ7.5AHE3_A/I suitable for automotive applications?
Yes, SMAJ7.5AHE3_A/I is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix, indicating RoHS-compliant and AEC-Q101 validated construction. It meets requirements for under-hood and chassis-mounted modules, including thermal cycling, humidity resistance, and mechanical shock - making it appropriate for engine control units, body electronics, and ADAS sensor protection circuits.
How does the leakage current of SMAJ7.5AHE3_A/I compare at its 7.5 V stand-off voltage?
At its 7.5 V stand-off voltage (VWM), the SMAJ7.5AHE3_A/I exhibits a maximum reverse leakage current (ID) of 100 μA at 25 °C. This low leakage ensures minimal power loss and avoids unintended loading of sensitive 7.5 V reference or sensor supply rails - especially important in battery-powered automotive subsystems where quiescent current must remain below 1 mA.
What is the thermal resistance of SMAJ7.5AHE3_A/I, and how does it affect PCB layout?
The SMAJ7.5AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures during repetitive surges, designers should ensure adequate copper area and avoid excessive trace length or isolation - particularly in high-temperature environments like engine compartments where ambient may exceed 85 °C.
Does SMAJ7.5AHE3_A/I have polarity marking, and how is it identified?
Yes, SMAJ7.5AHE3_A/I is a unidirectional TVS diode with polarity clearly marked: a visible cathode band is printed on the device body near one end. During PCB layout, the banded end must be connected to the line being protected (e.g., 12 V rail), while the opposite (anode) terminal connects to ground or return - incorrect orientation will prevent proper clamping and may cause catastrophic failure during surge events.
SMAJ7.5AHE3_A/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:
- Active
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ7.5AHE3_A/I FAQ
1.How can I place an order for SMAJ7.5AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5AHE3_A/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 SMAJ7.5AHE3_A/I reliable?
The price and inventory of SMAJ7.5AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ7.5AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5AHE3_A/I?
SMAJ7.5AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5AHE3_A/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 SMAJ7.5AHE3_A/I?
For technical support, including SMAJ7.5AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ7.5AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5AHE3_A/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 SMAJ7.5AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ7.5AHE3_A/I?
All SMAJ7.5AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5AHE3_A/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 SMAJ7.5AHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ7.5AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ7.5AHE3_A/I Tags
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