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Vishay General Semiconductor - Diodes Division SMAJ7.5AHE3/5A
- Part No.:
- SMAJ7.5AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.5AHE3/5A.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,076
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Product details
Overview
SMAJ7.5AHE3/5A from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping fast-rising voltage transients on DC 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, and clamps to ≤12.9 V at 31.0 A peak pulse current (IPPM) under 10/1000 μs waveform - ideal for protecting MOSFET gates and microcontroller I/O in automotive body electronics.
For engineers reviewing the SMAJ7.5AHE3/5A datasheet, SMAJ7.5AHE3/5A pinout, SMAJ7.5AHE3/5A application, or SMAJ7.5AHE3/5A equivalent, key selection criteria include its AEC-Q101 qualification, 400 W peak pulse power rating (10/1000 μs), low clamping ratio (VC/VBR ≈ 1.55), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp: reverse-biased during normal operation, it remains high-impedance until VWM (7.5 V) is exceeded, then rapidly transitions to low-impedance conduction above VBR (min 8.33 V). Its glass-passivated junction ensures stable breakdown and low leakage (<100 μA at VWM).
Thermal performance is defined by RθJA = 120 °C/W and RθJL = 30 °C/W, enabling reliable operation up to TJ = +150 °C. The device sustains 40 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine) and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 7.5 V - Maximum continuous reverse voltage before significant leakage; sets operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 8.33–9.21 V at 1.0 mA - Confirmed avalanche initiation range; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | ≤12.9 V at IPPM = 31.0 A (10/1000 μs) - Limits downstream voltage stress during ESD or load-dump events. |
| PPPM (Peak Pulse Power) | 400 W - Sustains single 10/1000 μs surges without degradation; derates to 300 W above 78 V. |
| ID (Reverse Leakage) | ≤100 μA at VWM - Minimizes standby power loss and avoids false triggering in low-current sensor circuits. |
| TJ max. | +150 °C - Enables use in under-hood automotive environments and industrial enclosures without thermal derating. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking on cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to system ground or lower-potential rail; defines polarity for unidirectional clamping. |
| Cathode | Clamping output / Surge current sink | Connected to protected line (e.g., 12 V supply or MCU I/O); conducts transient energy to ground when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified variant | SMAJ7.5AHE3/5A carries HE3 suffix confirming full automotive qualification - required for Tier-1 body control module designs. |
| 400 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 1 (inductive switch-off) and IEC 61000-4-5 Combination Wave surges without failure. |
| Low clamping voltage (VC = 12.9 V) | Provides ≥1.5 V margin below typical 13.5 V automotive supply peaks, preventing overvoltage damage to 12 V-rated ICs. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C) - eliminates baking requirements and simplifies manufacturing. |
| Glass passivated junction | Ensures stable VBR over time and temperature, with <0.1 %/°C drift - critical for long-life industrial deployments. |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and door actuator drivers from load-dump transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between LIN line and ground, triggered within <1 ns of overvoltage onset. Use Value: Limits voltage to ≤12.9 V during 35 V/100 ms load-dump events, preserving transceiver integrity without adding series resistance or propagation delay. |
Use Scenario: Shielding 4–20 mA current-loop sensor outputs from ESD and field-wiring induced surges in factory automation PLCs. IC Role / Device Role / Timing Role: Standoff-clamp protection on analog output node, operating continuously at 7.5 V nominal with <100 μA leakage. Use Value: Prevents latch-up in op-amp output stages while maintaining loop accuracy - no calibration drift due to leakage-induced offset. |
| Consumer Power Adapter Input Stage | Telecom PoE Interface Protection |
|
Use Scenario: Safeguarding primary-side controller ICs in AC/DC adapters against surge coupling from mains input during lightning-induced grid disturbances. IC Role / Device Role / Timing Role: First-line transient suppressor across bulk capacitor input, absorbing 400 W pulses before upstream fuse opens. Use Value: Extends adapter MTBF by eliminating repeated MOSFET gate oxide breakdown caused by sub-100 ns transients exceeding 20 V. |
Use Scenario: Protecting IEEE 802.3af/at PoE PD controllers from cable discharge events and Ethernet port ESD (IEC 61000-4-2 ±8 kV contact). IC Role / Device Role / Timing Role: Bidirectional-capable design not used here; unidirectional SMAJ7.5AHE3/5A applied on DC bias rail feeding PD interface IC. Use Value: Clamps common-mode surges to <13 V before they reach the PD controller's 12 V VDD pin - avoids brownout resets and latch-up recovery cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.5A-E3/5A | Commercial-grade version; lacks AEC-Q101 qualification and uses RoHS-compliant but non-automotive-tested construction. | Approved for consumer and industrial equipment only; excluded from automotive BOMs requiring PPAP documentation. | Select when cost sensitivity outweighs automotive compliance needs and ambient temperature stays ≤125 °C. |
| SMAJ7.5AHE3/61 | Same AEC-Q101 qualification and electrical specs; differs only in packaging - 7" tape-and-reel (1800 pcs) vs. 13" reel (7500 pcs). | No functional difference; choice driven solely by SMT line feeder compatibility and production lot sizing. | Choose for pilot builds or low-volume automotive prototyping where smaller reels reduce inventory holding time. |
Compared with SMAJ7.5A-E3/5A, the SMAJ7.5AHE3/5A adds verified automotive reliability and extended temperature margin; versus SMAJ7.5AHE3/61, it offers identical performance in higher-volume packaging - making it optimal for high-throughput Tier-1 production lines.
Availability
SMAJ7.5AHE3/5A is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, consumer power adapters, and telecom PoE protection requiring stable component supply with full AEC-Q101 traceability.
Supply support for SMAJ7.5AHE3/5A 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 high-reliability, high-efficiency solutions.
The SMAJ series was developed specifically for robust transient suppression in automotive and industrial environments, combining high pulse power, tight parameter tolerances, and AEC-Q101 validation in compact surface-mount packages.
FAQ
What is the clamping voltage of SMAJ7.5AHE3/5A at its rated peak pulse current?
The SMAJ7.5AHE3/5A clamps to a maximum of 12.9 V when subjected to its rated peak pulse current of 31.0 A under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and guarantees consistent overvoltage limiting across production lots - critical for validating protection margins in 12 V automotive systems where the SMAJ7.5AHE3/5A is commonly deployed.
Is SMAJ7.5AHE3/5A suitable for bidirectional transient protection?
No - SMAJ7.5AHE3/5A is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection, Vishay offers the SMAJ7.5CA variant. Using SMAJ7.5AHE3/5A in bidirectional applications risks forward conduction during negative transients, potentially damaging the device or failing to suppress. Always match the SMAJ7.5AHE3/5A polarity to system grounding architecture.
Does SMAJ7.5AHE3/5A meet automotive qualification standards?
Yes - the "HE3" suffix explicitly denotes AEC-Q101 qualification. SMAJ7.5AHE3/5A has passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per AEC-Q101 Rev D. This makes it acceptable for use in automotive body control modules, lighting systems, and infotainment power rails where component-level reliability certification is mandatory.
What is the maximum operating junction temperature for SMAJ7.5AHE3/5A?
The maximum operating junction temperature (TJ max.) for SMAJ7.5AHE3/5A is +150 °C, as specified in the Vishay datasheet. This rating enables deployment in under-hood environments and sealed industrial enclosures. Derating begins above TA = 25 °C per Figure 2 in the datasheet, with thermal resistance RθJA = 120 °C/W defining safe power dissipation limits at elevated ambient temperatures.
How does the leakage current of SMAJ7.5AHE3/5A affect low-power sensor circuits?
SMAJ7.5AHE3/5A exhibits ≤100 μA reverse leakage current at its 7.5 V stand-off voltage (VWM), measured at 25 °C. In battery-powered sensor nodes drawing microamps, this leakage is negligible - contributing less than 0.1 % error in 4–20 mA loops and avoiding measurable impact on sleep-mode current budgets. The low ID supports precision analog front-end protection without signal path corruption.
SMAJ7.5AHE3/5A 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ7.5AHE3/5A FAQ
1.How can I place an order for SMAJ7.5AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.5AHE3/5A 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 SMAJ7.5AHE3/5A reliable?
The price and inventory of SMAJ7.5AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ7.5AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ7.5AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.5AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.5AHE3/5A?
SMAJ7.5AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.5AHE3/5A 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 SMAJ7.5AHE3/5A?
For technical support, including SMAJ7.5AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.5AHE3/5A requirements.
6.How does Aetrix verify that SMAJ7.5AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ7.5AHE3/5A 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 SMAJ7.5AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ7.5AHE3/5A?
All SMAJ7.5AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.5AHE3/5A, 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 SMAJ7.5AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ7.5AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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