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Vishay General Semiconductor - Diodes Division SMAJ51AHE3/61
- Part No.:
- SMAJ51AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ51AHE3/61.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,113
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Product details
Overview
SMAJ51AHE3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 51 V stand-off voltage (VWM), 56.7–62.7 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤82.4 V at 4.9 A peak pulse current (IPPM) under 10/1000 μs waveform - ideal for safeguarding MOSFET gates, microcontroller I/O lines, and automotive sensor interfaces.
For engineers reviewing the SMAJ51AHE3/61 datasheet, SMAJ51AHE3/61 pinout, SMAJ51AHE3/61 application, or SMAJ51AHE3/61 equivalent, key selection criteria include its AEC-Q101 qualification, 400 W peak pulse power rating (≤78 V), SMA (DO-214AC) surface-mount package, and low 0.05 μA reverse leakage at VWM, ensuring reliability in automotive and industrial power rail protection.
Technical Context
This unidirectional TVS diode operates as a clamping device that remains high-impedance below 51 V and rapidly switches to low-impedance conduction above its 56.7 V minimum breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and fast response time (<1 ns) to ESD and lightning-induced surges.
Thermally, it supports operation from −55 °C to +150 °C with RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and handles 40 A non-repetitive forward surge (8.3 ms half-sine), making it suitable for both DC power line and signal-level transient suppression without derating in standard PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 48 V automotive or industrial rails. |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - Tight 5% tolerance ensures predictable turn-on across temperature and production lots. |
| VC @ IPPM | ≤82.4 V at 4.9 A - Clamping voltage limits downstream IC stress during 10/1000 μs transients (e.g., ISO 7637-2 Pulse 1/2a). |
| PPPM | 400 W - Peak pulse power handling capability on standard PCB layout; derates to 300 W above 78 V. |
| IR @ VWM | ≤1.0 μA - Ultra-low leakage preserves battery life in always-on automotive modules and sensor nodes. |
| TJ max | +150 °C - Enables use in under-hood automotive environments and high-temperature industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, TC, and ESD testing per JESD22 standards. |
Pinout & Package
Package: SMA (DO-214AC) - surface-mount, low-profile (2.54 mm lead pitch, 4.93 mm × 3.99 mm body), RoHS-compliant matte tin-plated leads, MSL Level 1 (260 °C reflow peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point | Connected to protected circuit node (e.g., MCU I/O); cathode ties to higher-potential rail (VCC or signal line). |
| Anode | Ground reference terminal | Connected to system ground or low-side return path; conducts surge current to GND during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Withstands automotive load dump and inductive switching surges without degradation on standard PCB copper pads. |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage performance across thermal cycling and humidity exposure. |
| AEC-Q101 qualified (HE3 suffix) | Meets automotive reliability requirements for engine control units, ADAS sensors, and body electronics. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ESD >15 kV contact discharge). |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, reducing manufacturing overhead. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery management system (BMS) monitoring circuits from load dump transients up to ±120 V. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between supply rail and ground to limit voltage excursions during alternator regulation failure. Use Value: Clamps to ≤82.4 V within nanoseconds, preventing damage to isolated ADCs and CAN transceivers powered from the same rail. |
Use Scenario: Safeguarding analog outputs of pressure/temperature transducers connected to PLC analog input modules. IC Role / Device Role / Timing Role: Signal-line TVS on 0–10 V or 4–20 mA output paths to absorb field-wiring induced surges. Use Value: Sub-1 μA leakage avoids loading precision output stages; 51 V VWM accommodates common industrial supply headroom. |
| Consumer Device USB Port Protection | Telecom Equipment DC Input Protection |
|
Use Scenario: Secondary overvoltage guard on USB-C VBUS line in portable docking stations exposed to hot-plug and adapter faults. IC Role / Device Role / Timing Role: Standoff-rated TVS upstream of USB PD controller to prevent latch-up during 20 V adapter misapplication. Use Value: 51 V VWM allows full USB PD 3.0 negotiation range while clamping fault conditions before internal FETs fail. |
Use Scenario: Front-end protection for -48 V telecom rectifier outputs feeding base station RF amplifiers. IC Role / Device Role / Timing Role: Unidirectional TVS tied between -48 V rail and chassis ground to shunt lightning-induced common-mode surges. Use Value: AEC-Q101 qualification ensures survivability in outdoor cabinet environments; 400 W rating covers IEC 61000-4-5 Level 4 tests. |
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 | Commercial-grade (non-AEC-Q101), identical electrical specs and SMA package. | Lacks automotive qualification; suitable for industrial/commercial designs without automotive lifecycle or reliability mandates. | Select when cost sensitivity outweighs AEC-Q101 requirement and ambient temperature stays ≤125 °C. |
| SMCJ51AHE3/61 | Same VWM/VBR/VC, but SMC (DO-214AB) package - 20% larger footprint, 1500 W PPPM. | Higher power handling enables use in primary power entry protection where surge energy exceeds 400 W. | Choose when board space permits larger package and system-level surge testing requires >400 W clamping capacity. |
Compared with SMAJ51AHE3/61, the E3/61 variant trades automotive qualification for lower cost in non-automotive systems, while the SMCJ51AHE3/61 offers 3.75× higher pulse power in a larger package - enabling scalable protection architecture without redesigning clamp circuit topology.
Availability
SMAJ51AHE3/61 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC analog I/O modules, consumer docking station power circuits, and telecom -48 V DC input stages requiring stable component supply with AEC-Q101 assurance.
Supply support for SMAJ51AHE3/61 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series is engineered for high-reliability transient suppression in automotive, industrial, and telecom infrastructure - delivering precise clamping, low leakage, and validated AEC-Q101 compliance in compact surface-mount packages.
FAQ
What is the maximum clamping voltage of the SMAJ51AHE3/61 under standard test conditions?
The SMAJ51AHE3/61 has a maximum clamping voltage (VC) of 82.4 V at 4.9 A peak pulse current (IPPM) using the 10/1000 μs waveform. This value is measured per JEDEC standards and reflects worst-case voltage seen by downstream circuitry during surge events - critical for validating margin against IC absolute maximum ratings in designs like automotive body controllers.
Is SMAJ51AHE3/61 suitable for bidirectional transient protection?
No, SMAJ51AHE3/61 is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection (e.g., AC lines or differential data buses), the SMAJ51CAHE3/61 variant must be used. Using SMAJ51AHE3/61 in reverse-biased configurations risks permanent breakdown due to lack of symmetric reverse conduction capability.
Does SMAJ51AHE3/61 require derating above 25 °C ambient temperature?
Yes - SMAJ51AHE3/61 derates linearly above 25 °C per Figure 2 in the Vishay datasheet (Doc. #88390). Its peak pulse power drops to 300 W at 78 V and above, and thermal resistance (RθJA = 120 °C/W) necessitates reduced surge duty cycle or enhanced copper pour in high-temperature environments such as under-hood automotive applications.
What does the "HE3" suffix signify in SMAJ51AHE3/61?
"HE3" denotes RoHS-compliant construction with AEC-Q101 qualification - specifically, high-reliability automotive grade, halogen-free molding compound, and matte tin-plated leads meeting JESD22-B102 solderability and JESD201 Class 2 whisker resistance. This distinguishes it from commercial "E3" variants and confirms suitability for automotive safety-critical subsystems.
Can SMAJ51AHE3/61 be used to protect 3.3 V or 5 V logic lines?
No - SMAJ51AHE3/61 is not appropriate for 3.3 V or 5 V logic protection due to its 51 V stand-off voltage (VWM). Using it on low-voltage rails would leave circuits unprotected until transients exceed 56.7 V. For 3.3 V/5 V I/O, lower-voltage TVS devices such as SMAJ5.0AHE3/61 (VWM = 5.0 V) or specialized low-capacitance ESD arrays are required.
SMAJ51AHE3/61 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):
- 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)
SMAJ51AHE3/61 FAQ
1.How can I place an order for SMAJ51AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ51AHE3/61 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 SMAJ51AHE3/61 reliable?
The price and inventory of SMAJ51AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ51AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ51AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ51AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ51AHE3/61?
SMAJ51AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ51AHE3/61 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 SMAJ51AHE3/61?
For technical support, including SMAJ51AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ51AHE3/61 requirements.
6.How does Aetrix verify that SMAJ51AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ51AHE3/61 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 SMAJ51AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ51AHE3/61?
All SMAJ51AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ51AHE3/61, 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 SMAJ51AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ51AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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