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Vishay General Semiconductor - Diodes Division SMBJ20AHE3_A/H
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- Part No.:
- SMBJ20AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20AHE3_A/H.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,247
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Product details
Overview
SMBJ20AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 20 V stand-off voltage (VWM), 22.2–24.5 V breakdown voltage (VBR) at 1 mA, 32.4 V maximum clamping voltage (VC) at 18.5 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), used to protect MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.
For engineers reviewing the SMBJ20AHE3_A/H datasheet, SMBJ20AHE3_A/H pinout, SMBJ20AHE3_A/H application, or SMBJ20AHE3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a clamping device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold, diverting transient energy away from protected circuitry. Its glass-passivated junction ensures stable leakage performance and fast response time (<1 ns), while the SMB package provides robust thermal dissipation with RθJA = 100 °C/W and RθJL = 20 °C/W.
The SMBJ20AHE3_A/H is rated for 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports 5.0 W steady-state power dissipation at TA = 50 °C, and maintains ≤1.0 µA reverse leakage at VWM - critical for low-power sensor and microcontroller I/O line protection where standby current integrity matters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC bias margin for protected line. |
| VBR (min/max) | 22.2 V / 24.5 V at IT = 1 mA - guaranteed avalanche onset range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 32.4 V at 18.5 A (10/1000 µs) - clamped voltage seen by downstream circuit during worst-case transient; determines residual stress on protected IC. |
| PPPM | 600 W - peak transient energy handling capacity; enables protection against IEC 61000-4-5 Level 4 surges (e.g., 4 kV/2 Ω) on 24 V systems. |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage at rated stand-off; preserves battery life and avoids false triggering in high-impedance sensor nodes. |
| TJ max. | +150 °C - extended junction temperature rating supports under-hood automotive and industrial environments without derating. |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 0.220" × 0.155" footprint; compatible with IPC-7351B land patterns and J-STD-020 MSL level 1 reflow. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by band marking on one end; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes clamping path during reverse transient events. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 24 V rail or CAN_H); carries full surge current into anode during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, ADAS, and body electronics. |
| 600 W peak pulse power (10/1000 µs) | Handles repetitive lightning-induced surges per ISO 7637-2 Pulse 1/2b/5a without degradation; supports >100,000 surge events under derated conditions. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during fast transients - critical for safeguarding 3.3 V or 5 V logic interfaces connected via level-shifting circuits. |
| MSL level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture sensitivity concerns; eliminates bake requirements prior to SMT placement. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage drift over 10+ years of field operation - essential for industrial IoT gateways with long service life. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load dump and alternator ripple transients on 24 V battery-fed ECUs in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between battery rail and DC-DC input, conducting only during negative-going surges above 20 V. Use Value: Limits voltage to ≤32.4 V during 100 A/100 ms load dump events, preventing damage to buck converter controllers and MCU power supplies. |
Use Scenario: Protecting analog output pins of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Standby-mode TVS shunting induced EFT bursts (IEC 61000-4-4) on 4–20 mA current-loop outputs. Use Value: Maintains ≤1 µA leakage at 20 V, avoiding offset errors in precision DACs; clamps 4 kV EFT pulses within 1 ns to preserve signal fidelity. |
| Telecom DC Power Input Protection | Motor Drive Gate Driver Protection |
|
Use Scenario: Safeguarding -48 V telecom rectifier inputs against lightning-induced surges in central office equipment. IC Role / Device Role / Timing Role: Reverse-biased TVS referenced to system ground, activated only when common-mode surge exceeds VWM. Use Value: Withstands 600 W peak power at -48 V rail, enabling compliance with Telcordia GR-1089-CORE Zone 3 surge immunity requirements. |
Use Scenario: Shielding high-side N-channel MOSFET gate drivers from Miller-induced voltage spikes during inductive switching. IC Role / Device Role / Timing Role: Clamping diode tied between gate and source, limiting dV/dt-induced overshoot during turn-off transitions. Use Value: Fast <1 ns response prevents unintended gate oxide breakdown; low VC ensures driver IC remains within absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20AHM3_A/H | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU public infrastructure projects). | Direct substitution if halogen-free content is required; same thermal and mechanical behavior. |
| SMCJ20AHE3_A/H | Same VWM/VBR/VC specs but in larger SMC (DO-214AB) package with 1500 W PPPM rating and lower RθJA (50 °C/W). | Better suited for higher-energy transients (e.g., IEC 61000-4-5 6 kV) or higher ambient temperature environments (>85 °C). | Choose when surge energy exceeds 600 W capability or board layout allows larger footprint; not drop-in due to different pad layout. |
Compared with SMBJ20AHE3_A/H, the SMBJ20AHM3_A/H offers identical protection performance with halogen-free construction, while the SMCJ20AHE3_A/H delivers 2.5× higher surge power handling in a physically larger package - enabling trade-offs between board space, energy rating, and material compliance.
Availability
SMBJ20AHE3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and motor drive gate drivers requiring stable component supply with AEC-Q101 assurance and long-term lifecycle support.
Supply support for SMBJ20AHE3_A/H 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure modes must be mitigated without compromising signal integrity or power efficiency.
FAQ
What is the maximum clamping voltage of SMBJ20AHE3_A/H under standard test conditions?
The SMBJ20AHE3_A/H has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current of 18.5 A using the 10/1000 µs waveform. This value is measured at TJ = 25 °C and represents the upper limit of voltage imposed on the protected circuit during transient events - critical for ensuring downstream components remain within their absolute maximum ratings. The SMBJ20AHE3_A/H achieves this clamping performance while maintaining low incremental surge resistance.
Is SMBJ20AHE3_A/H suitable for automotive applications?
Yes, SMBJ20AHE3_A/H is AEC-Q101 qualified and explicitly designated for automotive use with ordering code suffix "HE3". It undergoes rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD validation per JESD22 standards. The SMBJ20AHE3_A/H is deployed in engine control units, body control modules, and ADAS camera power supplies where sustained operation from -40 °C to +125 °C ambient and immunity to load dump transients are mandatory.
How does the SMBJ20AHE3_A/H differ from bidirectional variants like SMBJ20CA?
The SMBJ20AHE3_A/H is unidirectional and conducts only during reverse-biased overvoltage events, with polarity marked by a cathode band. In contrast, SMBJ20CA is bidirectional and symmetrical - suppressing transients of either polarity - making it appropriate for AC lines or differential buses like RS-485. The SMBJ20AHE3_A/H offers lower leakage (<1.0 µA) and tighter VBR tolerance than bidirectional versions, but cannot protect against positive-going surges on grounded lines without additional circuitry.
What is the thermal resistance profile of SMBJ20AHE3_A/H?
The SMBJ20AHE3_A/H exhibits a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per JEDEC standards, and a junction-to-lead resistance (RθJL) of 20 °C/W. These values enable reliable operation at 5.0 W steady-state power dissipation up to TA = 50 °C and support transient power handling without thermal runaway. PCB layout directly impacts RθJA - doubling copper area reduces it by ~25%, which is essential for high-duty-cycle surge environments.
Can SMBJ20AHE3_A/H be used in place of SMAJ20AHE3?
No, SMBJ20AHE3_A/H is not a direct replacement for SMAJ20AHE3 due to package and thermal differences: SMBJ uses DO-214AA (larger than SMAJ's DO-214AC), delivering 600 W vs. SMAJ's 400 W peak pulse power and offering lower RθJA (100 vs. 140 °C/W). While both share VWM = 20 V and similar VBR, the SMBJ20AHE3_A/H requires revised land pattern and supports higher surge energy - substitution demands layout verification and thermal validation in the target application.
SMBJ20AHE3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- 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:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 18.5A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMBJ)
SMBJ20AHE3_A/H FAQ
1.How can I place an order for SMBJ20AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20AHE3_A/H 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 SMBJ20AHE3_A/H reliable?
The price and inventory of SMBJ20AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ20AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20AHE3_A/H?
SMBJ20AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20AHE3_A/H 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 SMBJ20AHE3_A/H?
For technical support, including SMBJ20AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20AHE3_A/H requirements.
6.How does Aetrix verify that SMBJ20AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ20AHE3_A/H 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 SMBJ20AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ20AHE3_A/H?
All SMBJ20AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20AHE3_A/H, 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 SMBJ20AHE3_A/H part is unused and in its original packaging.
Return procedure for SMBJ20AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20AHE3_A/H Tags
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