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Vishay General Semiconductor - Diodes Division SMAJ51HE3/61
- Part No.:
- SMAJ51HE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ51HE3/61.pdf
- Description:
- TVS DIODE 51VWM 91.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,587
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Product details
Overview
SMAJ51HE3/61 from Vishay General Semiconductor is a high-reliability, AEC-Q101-qualified unidirectional transient voltage suppressor (TVS) in DO-214AC (SMA) package, designed to protect sensitive electronics against inductive switching transients and lightning-induced surges. It features a 51 V stand-off voltage (VWM), 91.1 V maximum clamping voltage (VC) at 4.4 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMAJ51HE3/61 datasheet, SMAJ51HE3/61 pinout, SMAJ51HE3/61 application, or SMAJ51HE3/61 equivalent, this device is selected for automotive-grade surge protection where stable clamping performance, low leakage (<1 µA at VWM), and MSL Level 1 reliability are required in compact surface-mount designs.
Technical Context
This TVS diode operates as a unidirectional clamp, conducting only when reverse voltage exceeds its breakdown threshold (56.7–69.3 V at 1 mA test current). Its glass-passivated junction ensures fast response time (<1 ns) and low incremental surge resistance, enabling effective suppression of sub-microsecond transients on power rails and signal lines.
The device is rated for continuous operation from −55 °C to +150 °C junction temperature, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), supporting robust thermal management on standard 0.2 × 0.2" copper pads. It meets RoHS 2002/95/EC and is qualified to AEC-Q101 for automotive underhood and infotainment applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VC @ IPPM | 91.1 V - Clamped voltage during 4.4 A 10/1000 µs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 400 W - Peak pulse power handling capability; supports single-event surge immunity per ISO 7637-2 Pulse 1/2a/5a. |
| IFSM | 40 A - Non-repetitive forward surge rating (8.3 ms half-sine); validates robustness against load dump events. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments without derating. |
| Leakage @ VWM | <1 µA - Ultra-low reverse leakage ensures minimal standby power loss in battery-critical systems. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline; compatible with automated placement and reflow (260 °C, 40 s). |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, cathode band marking on one end. Mounting requires 0.2 × 0.2" (5.0 × 5.0 mm) copper pads per terminal for full 400 W rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration. |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail or CAN-H); conducts when transient exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood use including temperature cycling, humidity, and mechanical shock per JESD22 standards. |
| Glass-passivated junction | Ensures stable VBR and low leakage over lifetime; eliminates risk of metallization migration under surge stress. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking; simplifies SMT manufacturing flow. |
| Low clamping ratio (VC/VWM = 1.79) | Minimizes overvoltage stress on downstream ICs compared to higher-ratio TVS devices. |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth in high-reliability automotive modules operating >10 years. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply lines in engine control units (ECUs) against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and point-of-load regulator input. Use Value: Limits transient voltage to ≤91.1 V, preventing damage to 36 V-rated LDOs and microcontrollers while surviving 40 A surge events. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC modules from ESD and cable discharge. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted directly at connector entry point to shunt fast transients before reaching ADC front-end. Use Value: Sub-1 µA leakage avoids signal offset errors; 91.1 V clamping preserves 24 V sensor compliance margins during 1 kV EFT bursts. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
Use Scenario: Safeguarding 48 V DC input of PoE-powered network switches against induced surges from nearby AC wiring. IC Role / Device Role / Timing Role: Primary-level TVS on main DC bus upstream of DC-DC converters and hot-swap controllers. Use Value: 400 W rating handles multi-kV lightning-induced surges; DO-214AC footprint allows dense layout near input connectors. |
Use Scenario: Adding secondary-level surge immunity to USB Type-A ports in smart home hubs exposed to user-handling ESD. IC Role / Device Role / Timing Role: Unidirectional clamp on VBUS line referenced to system ground, coordinated with primary ESD diodes. Use Value: 51 V VWM avoids false triggering during 5.25 V USB spec tolerance; <1 µA leakage prevents battery drain in portable modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51AHE3/61 | Lower breakdown range (56.7–62.7 V vs. 56.7–69.3 V); tighter VBR tolerance. | Better suited for precision clamping where consistent turn-on is critical; slightly reduced surge margin above VWM. | Select SMAJ51AHE3/61 when design requires tighter VBR matching across temperature and lot variance. |
| SMCJ51HE3/61 | Same VWM/VC but higher PPPM (1500 W) and larger DO-214AB (SMC) package. | Used where higher energy absorption is needed (e.g., heavy-duty industrial motor drives); requires PCB area increase. | Choose SMCJ51HE3/61 only if surge threat level exceeds 400 W; otherwise SMAJ51HE3/61 offers optimal size/power balance. |
Compared with SMAJ51AHE3/61, the SMAJ51HE3/61 provides broader breakdown voltage coverage for relaxed board-level tolerance stacking, while versus SMCJ51HE3/61 it delivers identical clamping performance in 40 % less PCB area-critical for space-constrained automotive modules.
Availability
SMAJ51HE3/61 is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and consumer USB power delivery systems requiring stable component supply with AEC-Q101 traceability and long-term lifecycle support.
Supply support for SMAJ51HE3/61 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 power management, protection, and sensing components with emphasis on automotive, industrial, and computing markets.
The SMAJ series was engineered specifically for high-reliability transient suppression in harsh environments, combining AEC-Q101 qualification, glass-passivated junctions, and standardized DO-214AC packaging for seamless integration into automotive and industrial power systems.
FAQ
What is the clamping voltage of SMAJ51HE3/61 under a 10/1000 µs surge?
The SMAJ51HE3/61 has a maximum clamping voltage (VC) of 91.1 V at 4.4 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per Fig. 1 and Fig. 3 of Vishay document 88390 and defines the upper voltage limit imposed on protected circuits during standardized surge events. The SMAJ51HE3/61 maintains this clamping performance across its full operating temperature range.
Is SMAJ51HE3/61 suitable for automotive applications?
Yes, SMAJ51HE3/61 is AEC-Q101 qualified and designated as high-reliability/automotive grade (HE3 suffix). It undergoes extended stress testing including temperature cycling, high-temperature reverse bias, and mechanical shock per JESD22 standards. The SMAJ51HE3/61 is explicitly recommended for under-hood and infotainment systems where sustained operation up to +150 °C and immunity to load dump transients are required.
What does the "HE3" suffix indicate in SMAJ51HE3/61?
The "HE3" suffix in SMAJ51HE3/61 denotes RoHS-compliant, high-reliability/automotive grade construction meeting AEC-Q101 requirements. It specifies matte tin-plated leads compliant with J-STD-002 and JESD22-B102, plus JESD201 Class 2 whisker resistance. This distinguishes SMAJ51HE3/61 from commercial-grade "E3" variants and confirms its suitability for mission-critical automotive deployments.
How does SMAJ51HE3/61 differ from SMAJ51AHE3/61?
SMAJ51HE3/61 has a wider breakdown voltage range (56.7–69.3 V) than SMAJ51AHE3/61 (56.7–62.7 V), resulting in greater unit-to-unit VBR variation but improved robustness against marginal overvoltage conditions. Both share identical VWM (51 V), VC (91.1 V), and PPPM (400 W). The SMAJ51HE3/61 is preferred when board-level tolerances demand broader clamping onset latitude.
What is the maximum reverse leakage current for SMAJ51HE3/61 at rated VWM?
The SMAJ51HE3/61 exhibits a maximum reverse leakage current (ID) of 1 µA at its 51 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage is confirmed in Table 1 of Vishay document 88390 and remains below 5 µA across the full −55 °C to +125 °C operating range, ensuring minimal impact on battery-powered or high-impedance sensor circuits.
SMAJ51HE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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)
SMAJ51HE3/61 FAQ
1.How can I place an order for SMAJ51HE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ51HE3/61 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 SMAJ51HE3/61 reliable?
The price and inventory of SMAJ51HE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ51HE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ51HE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ51HE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ51HE3/61?
SMAJ51HE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ51HE3/61 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 SMAJ51HE3/61?
For technical support, including SMAJ51HE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ51HE3/61 requirements.
6.How does Aetrix verify that SMAJ51HE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ51HE3/61 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 SMAJ51HE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ51HE3/61?
All SMAJ51HE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ51HE3/61, 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 SMAJ51HE3/61 part is unused and in its original packaging.
Return procedure for SMAJ51HE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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