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Vishay General Semiconductor - Diodes Division SMAJ22HE3/61
- Part No.:
- SMAJ22HE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22HE3/61.pdf
- Description:
- TVS DIODE 22VWM 39.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,923
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Product details
Overview
SMAJ22HE3/61 from Vishay General Semiconductor is a high-reliability, AEC-Q101-qualified unidirectional Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive and industrial surge protection. It features a 22 V standoff voltage (VWM), 24.4–29.8 V breakdown voltage (VBR at 1 mA), 39.4 V clamping voltage (VC) at 10.2 A peak pulse current, and 400 W peak pulse power (10/1000 µs waveform). It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and lightning-induced surges.
For engineers reviewing the SMAJ22HE3/61 datasheet, SMAJ22HE3/61 pinout, SMAJ22HE3/61 application, or SMAJ22HE3/61 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, clamping performance under 10/1000 µs surge, thermal resistance (RθJA = 120 °C/W), and RoHS-compliant high-reliability construction - all critical for automotive ECU, ADAS sensor interface, and industrial PLC design validation.
Technical Context
The SMAJ22HE3/61 operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast response (<1 ps) to transient overvoltages and low incremental surge resistance. Its 22 V stand-off rating allows reliable operation across 24 V automotive supply rails while maintaining low leakage (<1 µA at VWM).
It is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine), junction temperature range of –55 °C to +150 °C, and meets MSL Level 1 per J-STD-020 with 260 °C solder dip tolerance. The device uses matte tin-plated leads compliant with J-STD-002 and JESD22-B102, and passes JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before conduction; ensures compatibility with 24 V nominal automotive systems. |
| VBR (min/max) | 24.4 V / 29.8 V at 1 mA - Confirmed breakdown range defines turn-on threshold under transient stress. |
| VC @ IPPM | 39.4 V at 10.2 A - Clamping voltage limits downstream component stress during 10/1000 µs surge events. |
| PPPM | 400 W - Peak pulse power handling capability with 10/1000 µs waveform; derates above 78 V to 300 W. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms); supports robust protection in motor drive and relay coil snubbing. |
| TJ Range | –55 °C to +150 °C - Extended junction temperature range enables deployment in under-hood automotive environments. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient; informs PCB copper pad sizing (0.2 × 0.2") for thermal management. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, low-profile case with molded UL 94 V-0 compound. Cathode identified by band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to system ground or lower-potential rail in unidirectional TVS configuration. |
| Cathode | Avalanche conduction terminal | Connected to protected line (e.g., CAN_H, LIN, sensor output); conducts surge current to ground when VLINE exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per stress test plan. |
| Glass-passivated junction | Ensures stable VBR and low leakage over lifetime; prevents moisture ingress and parameter drift in humid environments. |
| MSL Level 1 rating | Enables standard SMT reflow without pre-baking; compatible with peak temperatures up to 260 °C for 40 s. |
| Low clamping ratio (VC/VWM ≈ 1.79) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V/5 V logic interfacing with 24 V bus lines. |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth under thermal cycling and humidity, eliminating latent short-circuit risk in long-life automotive modules. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: Protects microcontroller GPIOs and level-shifters connected to 24 V switch inputs subject to load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input line and chassis ground; clamps transients within nanoseconds to prevent latch-up or gate oxide damage. Use Value: Withstands 40 A surge and maintains <1 µA leakage at 22 V, ensuring low-power sleep mode integrity and long-term reliability in 15-year vehicle service life. |
Use Scenario: Shields 24 V digital input circuits in programmable logic controllers from field wiring surges and ESD events in factory automation. IC Role / Device Role / Timing Role: Front-end transient suppressor on DIN-rail mounted I/O module; absorbs repetitive 10/1000 µs surges from solenoid valve switching. Use Value: 400 W peak power rating and 120 °C/W RθJA allow sustained operation at 85 °C ambient without derating, reducing need for heatsinking or airflow. |
| ADAS Camera Power Line Protection | Automotive LIN Bus Transceiver Interface |
|
Use Scenario: Safeguards 12 V power rail of surround-view camera modules exposed to battery transients during cold-cranking and jump-start conditions. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power input; coordinates with upstream fuse and downstream LDO to limit fault energy. Use Value: 39.4 V clamping voltage ensures downstream 12 V-rated DC-DC converters remain within absolute maximum ratings during ISO 7637-2 Pulse 5a events. |
Use Scenario: Protects LIN transceiver pins (LIN_H/L) from ESD and coupled noise on vehicle harnesses in door modules and seat control units. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (cathode tied to LIN_H, anode to ground) suppressing both positive and negative transients relative to ground. Use Value: Low 22 V VWM avoids interfering with LIN's 12 V dominant state while clamping >30 V spikes - preserving bus timing and error-free communication. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22AHE3/61 | Lower VBR range (24.4–26.9 V) and tighter tolerance; clamps at 35.5 V @ 11.3 A. | Better suited for designs requiring lower clamping voltage margin, e.g., protecting 3.3 V logic powered from regulated 24 V intermediate rail. | Select SMAJ22AHE3/61 if VC ≤ 36 V is mandatory; SMAJ22HE3/61 offers higher surge margin for raw battery-line protection. |
| SMCJ22HE3/61 | Same VWM/VBR but in larger DO-214AB (SMC) package; rated for 1500 W PPPM and 68.8 A IPPM. | Used where higher single-event energy absorption is required, such as alternator load dump protection in engine control units. | Choose SMCJ22HE3/61 only when PCB layout permits larger footprint and surge threat exceeds 400 W; SMAJ22HE3/61 optimizes space-constrained sensor nodes. |
Compared with SMAJ22AHE3/61, the SMAJ22HE3/61 trades tighter VBR tolerance for higher clamping headroom, while versus SMCJ22HE3/61 it sacrifices peak power capacity for 40 % smaller board area - making it optimal for compact, high-volume automotive electronics where 400 W surge coverage suffices.
Availability
SMAJ22HE3/61 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, ADAS camera modules, and LIN bus interfaces requiring stable component supply with AEC-Q101 assurance and full traceability.
Supply support for SMAJ22HE3/61 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMAJ series is engineered specifically for automotive-grade transient suppression, combining AEC-Q101 qualification, extended temperature operation, and optimized clamping performance for 12 V/24 V vehicle electrical systems.
FAQ
What is the key reliability distinction of SMAJ22HE3/61 versus standard commercial-grade SMAJ22?
The SMAJ22HE3/61 carries the "HE3" suffix indicating high-reliability, automotive-grade qualification per AEC-Q101. Unlike commercial "E3" variants, it undergoes extended stress testing including high-temperature reverse bias, temperature cycling, and accelerated life testing. This ensures validated performance over 15+ years in under-hood environments - a requirement not met by standard SMAJ22 parts.
Does SMAJ22HE3/61 support bidirectional transient suppression?
No - SMAJ22HE3/61 is a unidirectional TVS diode, with polarity marked by a cathode band. It conducts only when the cathode is more positive than the anode. For bidirectional protection, Vishay specifies CA-suffix parts (e.g., SMAJ22CA); SMAJ22HE3/61 must be used with correct orientation in series with ground to protect positive-going transients on a single rail.
What is the maximum allowable PCB pad size for optimal thermal performance of SMAJ22HE3/61?
Vishay specifies 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per terminal for the published 400 W peak pulse power rating and RθJA = 120 °C/W. Reducing pad area increases thermal resistance and reduces surge capability; increasing pad size beyond this provides diminishing returns unless internal layer copper planes are also expanded and thermally stitched.
How does the clamping voltage of SMAJ22HE3/61 behave under repeated surge events?
SMAJ22HE3/61 maintains stable clamping voltage (VC = 39.4 V) under single 10/1000 µs pulses at 0.01 % duty cycle. At higher repetition rates, junction heating increases RθJA effective value, causing VC to rise slightly - data shows ≤5 % increase at 1 Hz repetition with adequate PCB copper. Derating curves in Figure 2 apply for multi-pulse design.
Is SMAJ22HE3/61 compatible with lead-free reflow profiles?
Yes - SMAJ22HE3/61 is qualified for lead-free soldering per J-STD-020 MSL Level 1, supporting peak reflow temperatures up to 260 °C for 40 seconds. Its matte tin plating meets JESD22-B102 and J-STD-002, and the HE3 suffix confirms compliance with JESD201 Class 2 whisker resistance requirements for automotive assembly.
SMAJ22HE3/61 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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 39.4V
- Current - Peak Pulse (10/1000µs):
- 10.2A
- 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)
SMAJ22HE3/61 FAQ
1.How can I place an order for SMAJ22HE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22HE3/61 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 SMAJ22HE3/61 reliable?
The price and inventory of SMAJ22HE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22HE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ22HE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22HE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22HE3/61?
SMAJ22HE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22HE3/61 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 SMAJ22HE3/61?
For technical support, including SMAJ22HE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22HE3/61 requirements.
6.How does Aetrix verify that SMAJ22HE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ22HE3/61 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 SMAJ22HE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ22HE3/61?
All SMAJ22HE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22HE3/61, 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 SMAJ22HE3/61 part is unused and in its original packaging.
Return procedure for SMAJ22HE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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