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Vishay General Semiconductor - Diodes Division SMAJ51AHE3_A/H
- Part No.:
- SMAJ51AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ51AHE3_A/H.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,274
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Product details
Overview
SMAJ51AHE3_A/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 51 V standoff voltage (VWM), 56.7–62.7 V breakdown voltage (VBR) at 1 mA, 82.4 V maximum clamping voltage (VC) at 4.9 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 SMAJ51AHE3_A/H datasheet, SMAJ51AHE3_A/H pinout, SMAJ51AHE3_A/H application, or SMAJ51AHE3_A/H equivalent, this part delivers AEC-Q101 qualified surge protection with low incremental surge resistance, fast response time, and MSL Level 1 moisture sensitivity - critical for high-reliability board-level ESD and load-switching transient suppression.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping device across DC power rails or low-speed signal paths, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance and long-term reliability under repetitive surge stress.
Designed for 10/1000 μs waveform compliance per ANSI/IEEE C62.35, it delivers 4.9 A peak pulse current (IPPM) at 82.4 V clamping while maintaining ≤1.0 μA leakage at 51 V (VWM). Thermal resistance is 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads, supporting operation from –55 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 51 V - maximum continuous reverse operating voltage before significant conduction begins |
| VBR (Breakdown Voltage) | 56.7–62.7 V at 1 mA - precise clamping initiation range ensuring margin above VWM |
| VC (Clamping Voltage) | 82.4 V at 4.9 A IPPM - limits downstream voltage during 10/1000 μs surge to safe levels |
| PPPM (Peak Pulse Power) | 400 W - sustains transient energy without failure under standardized surge waveform |
| ID (Reverse Leakage) | ≤1.0 μA at 51 V - negligible standby power loss and minimal impact on high-impedance circuits |
| TJ max. | +150 °C - enables use in under-hood automotive and industrial environments |
| Package | SMA (DO-214AC) - compact 2-pin surface-mount outline compatible with automated assembly |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; cathode indicated by band marking on unidirectional variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (cathode-biased during clamping) | Connected to lower-potential side of protected line; defines polarity for unidirectional operation |
| Cathode | Clamping reference terminal (marked with band) | Connected to higher-potential rail (e.g., VCC); conducts surge current to ground path when VREV > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and surge endurance |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges without degradation in production systems |
| Low clamping ratio (VC/VBR ≈ 1.33) | Minimizes overvoltage stress on protected ICs compared to higher-ratio suppressors |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT reflow profiles without preconditioning |
| Glass-passivated junction | Ensures stable VBR over lifetime and resistance to humidity-induced parameter drift |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery-supplied ECUs exposed to load-dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND to clamp positive-going spikes above 51 V. Use Value: Limits transient voltage to ≤82.4 V, protecting downstream LDOs and microcontrollers rated for 60 V absolute maximum. |
Use Scenario: Analog output lines from pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt ESD and inductive kickback from solenoid actuation. Use Value: Sub-1 ns response time prevents latch-up in precision op-amps and ADC front-ends during 8 kV contact discharge events. |
| Consumer Power Adapter Input Stage | Telecom DC Feeder Line Protection |
|
Use Scenario: Secondary-side 51 V DC bus in USB PD 3.0 adapters subject to capacitor discharge transients. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing energy from transformer leakage inductance during switching transitions. Use Value: 400 W rating handles repetitive 100 ns–1 μs spikes without thermal runaway, enabling compact heatsink-free design. |
Use Scenario: -48 V DC power feeders in base station remote radio units exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional clamping device referenced to system ground, coordinated with upstream gas discharge tube. Use Value: Low 1.0 μA leakage avoids loading sensitive -48 V supervision circuitry while providing precise 82.4 V clamping ceiling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A-E3/61 | Same electrical specs and SMA package; RoHS-compliant commercial grade (non-AEC-Q101) | Lacks automotive qualification; suitable for consumer/industrial designs without AEC requirements | Select when AEC-Q101 is not mandated and cost optimization is prioritized |
| SMBJ51AHE3_A/H | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package with 600 W PPPM rating | Higher power handling supports longer-duration transients; requires larger PCB footprint | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 or repeated surge duty cycle is elevated |
Compared with SMAJ51AHE3_A/H, SMAJ51A-E3/61 offers identical protection performance without automotive qualification, while SMBJ51AHE3_A/H provides 50 % higher surge power capacity at the expense of board space - enabling trade-offs between qualification assurance, footprint, and robustness.
Availability
SMAJ51AHE3_A/H is available at Aetrix Electronics and suitable for automotive control units, industrial sensor nodes, and telecom power systems requiring stable component supply with AEC-Q101 validation and full traceability.
Supply support for SMAJ51AHE3_A/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 and application-specific performance.
The SMAJ series targets board-level transient suppression in harsh environments, with design focus on automotive, industrial, and telecom infrastructure where consistent clamping behavior and qualification compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ51AHE3_A/H at its rated peak pulse current?
The SMAJ51AHE3_A/H has a maximum clamping voltage (VC) of 82.4 V at 4.9 A peak pulse current (IPPM), measured under the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in Vishay's official datasheet revision 09-Jan-2024, Document Number 88390. The SMAJ51AHE3_A/H maintains this clamping performance across its qualified operating temperature range.
Is SMAJ51AHE3_A/H suitable for automotive applications?
Yes, SMAJ51AHE3_A/H is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet under "Mechanical Data" and "Ordering Information". The "HE3" suffix denotes RoHS-compliant and AEC-Q101 qualified construction, making SMAJ51AHE3_A/H appropriate for under-hood and chassis-mounted automotive electronics where reliability under thermal cycling, vibration, and surge stress is required.
What is the package type and mounting compatibility of SMAJ51AHE3_A/H?
SMAJ51AHE3_A/H uses the SMA (DO-214AC) surface-mount package - a 2-pin, low-profile outline with 0.208" x 0.157" body dimensions and J-STD-002/JESD 22-B102 solderable matte tin leads. It is compatible with standard SMT pick-and-place equipment and reflow profiles up to 260 °C peak (MSL Level 1), and mounts on 0.2" × 0.2" copper pads per Vishay's thermal derating guidelines.
How does the breakdown voltage tolerance of SMAJ51AHE3_A/H affect circuit design?
The SMAJ51AHE3_A/H specifies a breakdown voltage (VBR) range of 56.7 V to 62.7 V at 1 mA test current, providing a guaranteed minimum margin above its 51 V standoff voltage (VWM). This ±5.5 % tolerance ensures reliable clamping initiation without premature conduction during normal operation, allowing designers to size downstream overvoltage protection margins with confidence - a key factor in robust power rail design using SMAJ51AHE3_A/H.
What is the maximum reverse leakage current for SMAJ51AHE3_A/H at its rated standoff voltage?
The maximum reverse leakage current (ID) for SMAJ51AHE3_A/H is 1.0 μA at 51 V (VWM) and 25 °C, as specified in the "Electrical Characteristics" table of the Vishay datasheet. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes standby power loss in battery-critical applications - a verified performance metric for SMAJ51AHE3_A/H under standard test conditions.
SMAJ51AHE3_A/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 4.9A
- 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)
SMAJ51AHE3_A/H FAQ
1.How can I place an order for SMAJ51AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ51AHE3_A/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 SMAJ51AHE3_A/H reliable?
The price and inventory of SMAJ51AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ51AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ51AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ51AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ51AHE3_A/H?
SMAJ51AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ51AHE3_A/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 SMAJ51AHE3_A/H?
For technical support, including SMAJ51AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ51AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ51AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ51AHE3_A/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 SMAJ51AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ51AHE3_A/H?
All SMAJ51AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ51AHE3_A/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 SMAJ51AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ51AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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