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Vishay General Semiconductor - Diodes Division SMAJ51HE3/5A
- Part No.:
- SMAJ51HE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ51HE3/5A.pdf
- Description:
- TVS DIODE 51VWM 91.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,994
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Product details
Overview
SMAJ51HE3/5A from Vishay General Semiconductor is a high-reliability, AEC-Q101-qualified unidirectional transient voltage suppressor (TVS) in DO-214AC (SMA) package, designed for automotive and industrial overvoltage protection. It features a 51 V standoff voltage (VWM), 91.1 V maximum clamping voltage (VC) at 4.4 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 µs waveform), protecting sensitive MOSFETs and ICs against inductive switching transients.
For engineers reviewing the SMAJ51HE3/5A datasheet, SMAJ51HE3/5A pinout, SMAJ51HE3/5A application, or SMAJ51HE3/5A equivalent, this device is selected for robust ESD and surge immunity in automotive powertrain control units, industrial sensor interfaces, and 24 V DC bus protection where AEC-Q101 qualification, low leakage (<1 µA at 51 V), and stable clamping under repetitive surges are critical.
Technical Context
This unidirectional TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1 ps) and low incremental surge resistance. Its breakdown voltage (VBR) is specified at 56.7–69.3 V with 1 mA test current, ensuring precise triggering above system operating voltage while maintaining tight tolerance.
The device operates across –55 °C to +150 °C junction temperature range and is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine). Thermal resistance is 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads, supporting reliable thermal dissipation in compact automotive PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 51 V - Blocks normal 24 V/48 V system operation without leakage; ensures no false triggering during steady-state conditions. |
| VC (Clamping Voltage) | 91.1 V at 4.4 A - Limits transient voltage to safe level for downstream 100 V-rated MOSFETs and logic ICs. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 µs) - Handles ISO 7637-2 Pulse 1/2a/5a surge events common in automotive 12 V/24 V systems. |
| IPPM (Peak Pulse Current) | 4.4 A - Sustains defined surge energy without degradation; derates linearly above 25 °C ambient per Fig. 2. |
| ID (Reverse Leakage) | <1 µA at 51 V - Minimizes standby power loss and avoids signal integrity issues in high-impedance sensor lines. |
| TJmax | +150 °C - Enables placement near hot components (e.g., power inductors, motor drivers) in engine bay modules. |
| AEC-Q101 Qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - required for powertrain and chassis ECUs. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single cathode-banded terminal configuration. Matte tin-plated leads meet J-STD-002 solderability and JESD22-B102 mechanical robustness standards. Molding compound complies with UL 94 V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-voltage rail; forms return path during clamping event. |
| Cathode (banded end) | Protected line input | Connected to line being protected (e.g., 24 V supply rail); conducts surge current to ground when VIN exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated chip junction | Ensures stable VBR and low leakage over lifetime, even under humidity and thermal stress in under-hood environments. |
| MSL Level 1 (J-STD-020) | Allows unlimited floor life and reflow at 260 °C peak - compatible with standard lead-free SMT assembly without baking. |
| High-reliability HE3 suffix | Meets JESD201 Class 2 whisker resistance - eliminates tin whisker risk in long-life automotive applications (>15 years). |
| 400 W peak pulse rating | Withstands ≥1000 surges of 10/1000 µs waveform at rated IPPM, meeting ISO 16750-2 and SAE J1113-11 requirements. |
| Low Rdyn (incremental surge resistance) | Minimizes VC overshoot during fast-rising transients (e.g., load dump), improving protection margin for 75 V-rated components. |
Applications
| Automotive Powertrain Control Unit | Industrial 24 V Sensor Interface |
|---|---|
|
Use Scenario: Protecting microcontroller I/O and CAN transceiver power rails from alternator load dump and inductive kickback in engine control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V supply and ground, clamping transients within 1 ps to prevent latch-up or gate oxide damage. Use Value: AEC-Q101 qualification and 150 °C TJmax ensure functional safety compliance (ISO 26262 ASIL-B) without derating in under-hood mounting. |
Use Scenario: Shielding analog front-end inputs of pressure/temperature sensors in factory automation PLCs exposed to relay coil switching noise. IC Role / Device Role / Timing Role: Standoff-rated TVS on sensor VSENSE line, holding <1 µA leakage at 24 V to preserve measurement accuracy. Use Value: 91.1 V clamping limits fault voltage below ADC input absolute maximum rating (100 V), preventing data corruption during EMC testing. |
| DC Motor Drive Power Stage | Telecom 48 V Backup Supply |
|
Use Scenario: Safeguarding high-side N-channel MOSFET gates and bootstrap capacitors from flyback voltage spikes during PWM commutation. IC Role / Device Role / Timing Role: TVS connected from gate driver output to ground, absorbing sub-100 ns turn-off spikes before they reach gate oxide. Use Value: Low dynamic resistance and 400 W rating sustain repeated 4.4 A surges without parameter drift-critical for >100 kHz motor control loops. |
Use Scenario: Guarding PoE-powered network switches against lightning-induced surges on 48 V backup battery input lines. IC Role / Device Role / Timing Role: Primary clamping device on 48 V rail, coordinated with upstream GDT and downstream polymer PTC for multi-stage protection. Use Value: DO-214AC footprint enables high-density layout; RoHS-compliant HE3 construction meets telecom environmental compliance (RoHS/WEEE). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51AHE3/5A | Lower VBR range (56.7–62.7 V vs. 56.7–69.3 V); tighter 10% VWM tolerance. | Better suited for precision 51 V systems requiring minimal clamping variation; slightly lower IPPM (4.9 A). | Select SMAJ51AHE3/5A when VBR consistency across production lots is prioritized over maximum surge headroom. |
| SMBJ51HE3/5A | Same electrical specs but SMB (DO-214AA) package - 2.5 mm wider body, higher PPPM (600 W), 20% larger pad area. | Preferred where board space allows and higher surge margin is needed (e.g., commercial vehicle alternator circuits). | Choose SMBJ51HE3/5A only if layout permits larger footprint and 600 W rating is required; not drop-in compatible due to different land pattern. |
Compared with SMAJ51HE3/5A, SMAJ51AHE3/5A offers tighter VBR control for stable clamping in regulated 51 V systems, while SMBJ51HE3/5A provides higher surge capacity in a physically larger package - neither is pin-compatible, and both require PCB layout revision.
Availability
SMAJ51HE3/5A is available at Aetrix Electronics and suitable for automotive powertrain control units, industrial 24 V sensor interfaces, and DC motor drive power stages requiring stable component supply with full AEC-Q101 traceability and RoHS/WEEE compliance.
Supply support for SMAJ51HE3/5A 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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMAJ series was engineered specifically for AEC-Q101-compliant transient suppression in harsh-environment electronics, emphasizing thermal stability, surge endurance, and solder-joint reliability in surface-mount automotive modules.
FAQ
What is the clamping voltage of SMAJ51HE3/5A at its rated peak pulse current?
The SMAJ51HE3/5A has a maximum clamping voltage (VC) of 91.1 V at 4.4 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ51HE3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ51HE3/5A qualified for automotive applications?
Yes, SMAJ51HE3/5A carries the HE3 suffix, indicating it is AEC-Q101 qualified for high-reliability automotive use. It has passed stress tests including temperature cycling, high-temperature reverse bias (HTRB), and surge endurance per AEC-Q101 Rev D. The SMAJ51HE3/5A is commonly deployed in engine control units, transmission control modules, and ADAS power supplies where extended lifetime and under-hood thermal resilience are mandatory.
What does the "5A" in SMAJ51HE3/5A indicate?
The "5A" in SMAJ51HE3/5A denotes the preferred package code for 13-inch plastic tape-and-reel delivery, containing 7500 units per reel. This packaging format supports high-volume automated SMT placement and is distinct from the "61" code (7-inch reel, 1800 units). The SMAJ51HE3/5A's reel specification is documented in Vishay's ordering information table on page 4 of document 88390.
How does SMAJ51HE3/5A differ from the standard SMAJ51HE3/61 variant?
The SMAJ51HE3/5A and SMAJ51HE3/61 share identical electrical specifications, AEC-Q101 qualification, and DO-214AC package. Their sole difference is packaging: SMAJ51HE3/5A ships on 13-inch reels (7500 units), while SMAJ51HE3/61 uses 7-inch reels (1800 units). Both variants have identical unit weight (0.064 g), thermal characteristics, and solder profile compatibility - the SMAJ51HE3/5A is optimized for high-throughput production lines.
What is the maximum operating junction temperature for SMAJ51HE3/5A?
The SMAJ51HE3/5A has a maximum operating junction temperature (TJmax) of +150 °C, as specified in the "Maximum Ratings" table of Vishay document 88390. This rating enables reliable operation in under-hood automotive environments and near heat-generating components such as power inductors or motor drivers. Derating curves in Figure 2 define allowable power dissipation versus ambient temperature for the SMAJ51HE3/5A.
SMAJ51HE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 91.1V
- Current - Peak Pulse (10/1000µs):
- 4.4A
- 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)
SMAJ51HE3/5A FAQ
1.How can I place an order for SMAJ51HE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ51HE3/5A 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 SMAJ51HE3/5A reliable?
The price and inventory of SMAJ51HE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ51HE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ51HE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ51HE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ51HE3/5A?
SMAJ51HE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ51HE3/5A 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 SMAJ51HE3/5A?
For technical support, including SMAJ51HE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ51HE3/5A requirements.
6.How does Aetrix verify that SMAJ51HE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ51HE3/5A 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 SMAJ51HE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ51HE3/5A?
All SMAJ51HE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ51HE3/5A, 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 SMAJ51HE3/5A part is unused and in its original packaging.
Return procedure for SMAJ51HE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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