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Vishay General Semiconductor - Diodes Division SMAJ75AHE3/5A
- Part No.:
- SMAJ75AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ75AHE3/5A.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,809
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Product details
Overview
SMAJ75AHE3/5A 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 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 - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ75AHE3/5A datasheet, SMAJ75AHE3/5A pinout, SMAJ75AHE3/5A application, or SMAJ75AHE3/5A equivalent, key selection criteria include its AEC-Q101 qualification, unidirectional polarity with cathode band marking, low incremental surge resistance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt clamp during overvoltage events, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time. Its unidirectional configuration allows integration into DC-biased circuits where reverse conduction must be blocked until clamping threshold is exceeded.
The device delivers 400 W peak pulse power up to 78 V and derates to 300 W above that level, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It supports repetitive surge duty cycles up to 0.01 % and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 83.3 V / 92.1 V at 1 mA - ensures reliable turn-on within defined tolerance band under standardized test conditions |
| VC @ IPPM | 121 V at 3.3 A - clamping voltage seen across terminals during 10/1000 μs transient, limiting stress on downstream components |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - peak transient energy absorption capability with industry-standard waveform |
| ID @ VWM | 1.0 μA - ultra-low leakage preserves system efficiency in standby and low-power modes |
| TJ max | +150 °C - enables operation in under-hood automotive and high-temperature industrial environments |
| Package | SMA (DO-214AC) - compact 2-pin surface-mount outline compatible with standard SMT pick-and-place and reflow processes |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1, 260 °C reflow compatible. Cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (cathode-biased side) | Connected to lower-potential node (e.g., ground or return path); conducts during forward surge or clamping event |
| Cathode | Reverse-blocking terminal (marked with band) | Connected to protected line (e.g., +12 V rail); blocks normal operation but avalanches during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) when mounted on 5.0 mm × 5.0 mm copper pads |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives, critical for harsh-environment deployment |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes voltage overshoot during transients, reducing risk of latch-up or gate oxide damage in protected MOSFETs/ICs |
| MSL Level 1 | Enables single-pass reflow without baking, lowering manufacturing cost and eliminating moisture-related popcorning risk |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V and 24 V battery-fed ECUs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp positive-going spikes before they reach LDOs or microcontrollers. Use Value: Withstands 400 W surges while holding clamped voltage ≤121 V, preventing damage to 36 V-rated input stages in automotive PMICs. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation systems. IC Role / Device Role / Timing Role: Low-capacitance TVS installed at connector entry point to divert fast transients (<1 ns rise time) away from precision ADC front-ends. Use Value: Sub-μA leakage at 75 V ensures no signal offset or gain error in mV-level sensor outputs; 121 V clamping avoids saturation of rail-to-rail op-amps. |
| DC-DC Converter Input Stage | Telecom Line Card Surge Protection |
Use Scenario: Safeguarding buck converter inputs against inductive switching spikes from relay coils or solenoid drivers. IC Role / Device Role / Timing Role: Fast-response shunt clamp parallel to input capacitor, activated within nanoseconds to suppress >100 V transients. Use Value: 3.3 A peak pulse current rating and 30 °C/W junction-to-lead thermal resistance enable rapid heat dissipation during repeated 10/1000 μs pulses. |
Use Scenario: Front-end protection for PoE-powered Ethernet modules exposed to lightning-induced surges on twisted-pair lines. IC Role / Device Role / Timing Role: Unidirectional TVS deployed on each powered pair (e.g., pins 4–5 and 7–8) to clamp common-mode overvoltages. Use Value: AEC-Q101 qualification and 150 °C max junction temperature support extended field life in outdoor telecom cabinets with wide ambient swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75A-E3/5A | No AEC-Q101 qualification; commercial-grade only; identical electrical specs and package | Suitable for non-automotive industrial or consumer designs where automotive reliability is not mandated | Select when cost sensitivity outweighs qualification requirements and environmental stress testing is not required |
| SMBJ75AHE3/5A | Same VWM/VBR/VC ratings but in SMB (DO-214AA) package - 27 % larger footprint and higher thermal resistance (RθJA = 140 °C/W) | Better suited for higher average power dissipation needs where PCB space permits larger pad layout | Choose when board layout allows larger footprint and enhanced thermal margin is prioritized over miniaturization |
Compared with SMAJ75AHE3/5A, the E3/5A variant trades automotive qualification for lower unit cost, while SMBJ75AHE3/5A offers improved thermal handling at the expense of PCB area - enabling trade-offs between reliability assurance, thermal performance, and space-constrained design goals.
Availability
SMAJ75AHE3/5A is available at Aetrix Electronics and suitable for automotive control units, industrial sensor nodes, and telecom line cards requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ75AHE3/5A 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 and automotive-grade solutions.
The SMAJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for robust transient suppression in demanding automotive, industrial, and telecom power systems where fast response and repeatable clamping are critical.
FAQ
What is the clamping voltage of SMAJ75AHE3/5A at its rated peak pulse current?
The SMAJ75AHE3/5A has a maximum clamping voltage (VC) of 121 V at 3.3 A peak pulse current (IPPM), measured using the standard 10/1000 μs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and is confirmed in the Vishay datasheet Document Number 88390, Table on page 2.
Is SMAJ75AHE3/5A suitable for automotive applications?
Yes, SMAJ75AHE3/5A is AEC-Q101 qualified, as indicated by the "HE3" suffix, and is explicitly rated for automotive use per Vishay's ordering information and thermal characterization. It supports operating junction temperatures up to +150 °C and passes stress tests required for under-hood and body-control module deployments.
What does the "5A" in SMAJ75AHE3/5A signify?
The "5A" denotes the preferred package code indicating 13-inch diameter plastic tape-and-reel delivery containing 7500 units. This packaging format is optimized for high-volume SMT assembly lines and aligns with IPC-7351 standards for DO-214AC footprints.
How does SMAJ75AHE3/5A differ from bidirectional variants like SMAJ75CA?
SMAJ75AHE3/5A is unidirectional and features a cathode band marking; it blocks reverse current until breakdown occurs in the forward direction. In contrast, SMAJ75CA is bidirectional with symmetrical clamping in both polarities and no polarity marking - making it appropriate for AC-coupled or floating signal lines where polarity reversal may occur.
What is the maximum leakage current of SMAJ75AHE3/5A at its stand-off voltage?
The maximum reverse leakage current (ID) of SMAJ75AHE3/5A is 1.0 μA when biased at its 75 V stand-off voltage (VWM), measured at TA = 25 °C. This ultra-low leakage ensures minimal impact on power budget and signal integrity in always-on or battery-operated systems.
SMAJ75AHE3/5A 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):
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ75AHE3/5A FAQ
1.How can I place an order for SMAJ75AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ75AHE3/5A 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 SMAJ75AHE3/5A reliable?
The price and inventory of SMAJ75AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ75AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ75AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ75AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ75AHE3/5A?
SMAJ75AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ75AHE3/5A 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 SMAJ75AHE3/5A?
For technical support, including SMAJ75AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ75AHE3/5A requirements.
6.How does Aetrix verify that SMAJ75AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ75AHE3/5A 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 SMAJ75AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ75AHE3/5A?
All SMAJ75AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ75AHE3/5A, 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 SMAJ75AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ75AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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