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Vishay General Semiconductor - Diodes Division SMAJ20HE3/61
- Part No.:
- SMAJ20HE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ20HE3/61.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,409
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Product details
Overview
SMAJ20HE3/61 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 20 V stand-off voltage (VWM), 35.8 V maximum clamping voltage (VC) at 11.2 A peak pulse current (IPPM), 400 W peak pulse power (10/1000 µs), and operates from −55 °C to +150 °C junction temperature - deployed on power rails and signal lines of engine control units and sensor interfaces.
For engineers reviewing the SMAJ20HE3/61 datasheet, SMAJ20HE3/61 pinout, SMAJ20HE3/61 application, or SMAJ20HE3/61 equivalent, this page delivers verified electrical parameters, automotive-grade qualification status, clamping performance under standardized surge waveforms, thermal resistance data, and direct alternatives with documented differences in breakdown voltage tolerance and leakage behavior.
Technical Context
The SMAJ20HE3/61 employs a glass-passivated silicon avalanche junction optimized for fast response (<1 ps) to transient events such as ISO 7637-2 load dump or ESD per IEC 61000-4-2. Its unidirectional polarity enables integration into DC-biased circuits where reverse conduction must be blocked until clamping threshold is exceeded.
Rated for 400 W peak pulse power (derated to 300 W above 78 V), it sustains repetitive surges at 0.01% duty cycle and meets J-STD-020 MSL Level 1 (260 °C reflow). Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead) when mounted on 5.0 × 5.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for protected line. |
| VBR min / max | 22.2 V / 27.1 V at 1 mA - Breakdown voltage range ensures predictable turn-on across production lot; critical for timing-critical protection windows. |
| VC @ IPPM | 35.8 V at 11.2 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream ICs like microcontrollers or CAN transceivers. |
| IPPM | 11.2 A - Peak surge current capability under standard waveform; directly correlates to energy absorption (≈400 W × 1 ms = 0.4 J). |
| ID @ VWM | 1.0 µA - Reverse leakage at rated stand-off voltage; low value minimizes standby power loss in battery-sensitive automotive modules. |
| TJ range | −55 °C to +150 °C - Full automotive temperature range support; validated for under-hood and transmission control unit environments. |
| Package | DO-214AC (SMA) - Surface-mount outline with cathode band marking; compatible with automated pick-and-place and IR reflow (260 °C, 40 s). |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, RoHS-compliant, AEC-Q101 qualified, MSL Level 1. Cathode indicated by band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | High-side connection point for unidirectional clamping | Connected to protected line (e.g., 24 V supply rail); conducts surge current to ground when VLINE exceeds VBR. |
| Anode (unbanded end) | Reference/ground return path | Typically tied to system ground plane; completes low-inductance surge current loop essential for effective transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS sensors - supports PPAP and long-term reliability requirements. |
| Glass-passivated junction | Ensures stable breakdown characteristics over temperature and lifetime; eliminates surface contamination sensitivity common in epoxy-passivated devices. |
| 400 W peak pulse power (10/1000 µs) | Withstands ISO 16750-2 pulse 5a (load dump) up to 35 V without degradation; enables single-device protection for 12 V/24 V systems. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., EFT bursts), improving protection margin for 3.3 V or 5 V logic interfaces. |
| MSL Level 1 rating | Allows unlimited floor life and full 260 °C reflow compatibility - eliminates baking requirements and simplifies SMT manufacturing flow. |
Applications
| Engine Control Unit (ECU) Power Input | Automotive CAN Bus Line Protection |
|---|---|
|
Use Scenario: Protects 12 V supply input of engine control units against ISO 7637-2 pulses (P1, P2a, P3a/b) and alternator load dump. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor; clamps transients within nanoseconds to limit voltage seen by LDOs and MCU power pins. Use Value: Maintains VC ≤ 35.8 V during 11.2 A surge, preventing latch-up or permanent damage to 36 V-rated power management ICs downstream. |
Use Scenario: Shields high-speed CAN H/L differential pair from ESD (IEC 61000-4-2 ±8 kV contact) and coupled noise in vehicle wiring harnesses. IC Role / Device Role / Timing Role: Dual unidirectional configuration (one device per line) referenced to ground; responds faster than bus termination resistors to divert surge energy. Use Value: Low 1.0 µA leakage preserves signal integrity at 1 Mbps CAN FD rates; clamping action occurs before transceiver input stages exceed absolute maximum ratings. |
| Industrial Sensor Signal Conditioning | DC-DC Converter Output Rail Protection |
|
Use Scenario: Safeguards analog outputs (4–20 mA, 0–10 V) of pressure/temperature sensors exposed to field wiring inductive kickback. IC Role / Device Role / Timing Role: Placed at sensor PCB edge, directly across output and ground; absorbs 10/1000 µs surges induced by relay switching in adjacent cabinets. Use Value: 20 V VWM allows compatibility with 24 V loop-powered sensors while 35.8 V VC protects 36 V op-amps and ADC front-ends. |
Use Scenario: Prevents overvoltage failure of isolated DC-DC converter outputs due to primary-side MOSFET failure or feedback loop disruption. IC Role / Device Role / Timing Role: Connected from regulated output to ground; acts as crowbar during catastrophic secondary-side short, limiting voltage excursion before fuse interruption. Use Value: 400 W rating handles stored energy from output capacitors (e.g., 100 µF @ 24 V ≈ 0.029 J); 150 °C TJ max supports operation near hot converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20AHE3/61 | Breakdown voltage tighter: 22.2 V–24.5 V (vs. 22.2 V–27.1 V); 32.4 V clamping at 12.3 A. | Lower VC improves margin for 3.3 V logic but reduced VBR spread may increase false triggering risk on noisy 24 V rails. | Select SMAJ20AHE3/61 when clamping voltage headroom is constrained and system noise is well-filtered. |
| SMBJ20HE3/61 | Same VWM/VBR specs but SMB package (DO-214AA); 600 W peak power rating; RθJA = 80 °C/W. | Higher power handling suits higher-energy transients; larger footprint requires PCB layout change and reduces board density. | Choose SMBJ20HE3/61 only if surge energy exceeds 400 W capability and space permits larger package. |
Compared with SMAJ20HE3/61, SMAJ20AHE3/61 offers lower clamping voltage at cost of narrower breakdown tolerance, while SMBJ20HE3/61 trades smaller size for greater surge capacity and improved thermal dissipation - neither is pin-compatible due to differing package outlines.
Availability
SMAJ20HE3/61 is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, CAN bus interfaces, and DC-DC converter designs requiring stable component supply with AEC-Q101 compliance and extended temperature operation.
Supply support for SMAJ20HE3/61 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, rectifiers, TVS, MOSFETs, and optoelectronics with emphasis on reliability and automotive-grade qualification.
The SMAJ series is engineered specifically for robust transient suppression in harsh environments - targeting automotive power distribution, industrial automation, and transportation electronics where AEC-Q101 validation and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of SMAJ20HE3/61 under a 10/1000 µs surge?
The SMAJ20HE3/61 clamps to a maximum of 35.8 V when subjected to its rated peak pulse current of 11.2 A using the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and forms the basis for downstream IC voltage stress analysis in designs such as automotive ECUs and industrial sensor modules.
Is SMAJ20HE3/61 qualified for automotive use?
Yes, SMAJ20HE3/61 carries AEC-Q101 qualification and is designated as high-reliability/automotive grade (HE3 suffix). It is tested for temperature cycling, humidity bias, mechanical shock, and surge endurance per the AEC standard - making it suitable for under-hood and chassis-mounted applications where ambient temperatures reach +125 °C and beyond.
What does the "HE3" suffix mean in SMAJ20HE3/61?
The "HE3" suffix in SMAJ20HE3/61 indicates RoHS-compliant, high-reliability/automotive-grade construction meeting JESD201 Class 2 whisker resistance, AEC-Q101 qualification, and MSL Level 1 reflow capability. It distinguishes this variant from commercial-grade "E3" parts and confirms suitability for mission-critical automotive and industrial deployments.
How does SMAJ20HE3/61 differ from SMAJ20AHE3/61?
SMAJ20HE3/61 has a breakdown voltage range of 22.2 V–27.1 V, while SMAJ20AHE3/61 tightens this to 22.2 V–24.5 V and lowers clamping voltage to 32.4 V. The "A" variant provides better voltage precision and lower clamping but sacrifices some margin against false triggering on noisy supply rails - both share identical package, thermal specs, and AEC-Q101 qualification.
What is the maximum reverse leakage current for SMAJ20HE3/61 at rated VWM?
The SMAJ20HE3/61 exhibits a maximum reverse leakage current (ID) of 1.0 µA when biased at its 20 V stand-off voltage (VWM) and measured at 25 °C. This low leakage supports energy-efficient design in always-on automotive modules and extends battery life in remote industrial sensors powered by primary cells.
SMAJ20HE3/61 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 11.2A
- 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)
SMAJ20HE3/61 FAQ
1.How can I place an order for SMAJ20HE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ20HE3/61 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 SMAJ20HE3/61 reliable?
The price and inventory of SMAJ20HE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ20HE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ20HE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ20HE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ20HE3/61?
SMAJ20HE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ20HE3/61 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 SMAJ20HE3/61?
For technical support, including SMAJ20HE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ20HE3/61 requirements.
6.How does Aetrix verify that SMAJ20HE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ20HE3/61 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 SMAJ20HE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ20HE3/61?
All SMAJ20HE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ20HE3/61, 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 SMAJ20HE3/61 part is unused and in its original packaging.
Return procedure for SMAJ20HE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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