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Vishay General Semiconductor - Diodes Division SMBJ20AHE3_B/H
- Part No.:
- SMBJ20AHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20AHE3_B/H.pdf
- Description:
- 600W,20V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,011
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Product details
Overview
SMBJ20AHE3_B/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 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, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and automotive ECUs.
For engineers reviewing the SMBJ20AHE3_B/H datasheet, SMBJ20AHE3_B/H pinout, SMBJ20AHE3_B/H application, or SMBJ20AHE3_B/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, 1.0 µA max reverse leakage at VWM, thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive circuit nodes, conducting only when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable avalanche characteristics, low incremental surge resistance, and fast response time (<1 ns), enabling effective suppression of ESD, lightning-induced surges, and inductive switching spikes.
The SMBJ20AHE3_B/H variant is AEC-Q101 qualified and RoHS-compliant, with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. It meets MSL Level 1 (peak reflow 260 °C) and UL 94 V-0 flammability requirements, supporting high-reliability deployment in automotive and industrial environments where junction temperature must remain ≤150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 22.2 V / 24.5 V at IT = 1 mA - Confirmed breakdown range ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 32.4 V at 18.5 A - Clamped voltage under 600 W 10/1000 µs surge; limits stress on downstream components. |
| IPPM | 18.5 A - Peak pulse current capability with defined waveform; determines survivability against standardized transients. |
| PPPM | 600 W - Peak pulse power rating; validates robustness against repetitive or single-event surges per IEC 61000-4-5. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on recommended 0.2" × 0.2" copper pads; informs board-level thermal design. |
| TJ max | +150 °C - Maximum junction temperature; sets upper limit for ambient + power dissipation in sealed enclosures. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with cathode band marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); terminals are matte tin-plated for lead-free soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to ground or low-side reference in unidirectional protection. | Provides return path during clamping; requires low-inductance PCB trace to minimize voltage overshoot. |
| Cathode | Current exit terminal in forward bias; marked by band; connected to protected line (e.g., VIN, signal). | Defines polarity-sensitive placement; reverse connection disables clamping function and risks device failure. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics, ensuring reliability under temperature cycling and humidity exposure. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) without degradation when mounted per recommended pad layout. |
| Glass passivated junction | Enables stable avalanche behavior across temperature and lifetime, minimizing parameter drift in harsh environments. |
| MSL Level 1 rating | Supports standard Pb-free reflow profiles up to 260 °C peak without moisture-induced damage or delamination. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Indicates efficient energy diversion with minimal overvoltage margin - critical for protecting 24 V logic and microcontrollers. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (up to 35 V, 100 ms) on 24 V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input, clamping within nanoseconds to prevent regulator latch-up. Use Value: Enables compliance with ISO 7637-2 Pulse 5a while maintaining <1.0 µA leakage at nominal 24 V system voltage. |
Use Scenario: Protecting analog outputs of pressure sensors in factory automation PLC modules exposed to motor drive noise. IC Role / Device Role / Timing Role: Parallel-connected TVS on 4–20 mA current loop output, limiting induced surges to <32.4 V during contactor switching. Use Value: Preserves sensor accuracy by holding clamping voltage below ADC input absolute maximum rating (36 V). |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Guarding PoE-powered network switches against Ethernet cable ESD and nearby lightning coupling. IC Role / Device Role / Timing Role: Secondary-stage TVS on 48 V DC input after primary MOV, absorbing residual 10/1000 µs surges not filtered upstream. Use Value: Delivers 600 W pulse handling without derating at 70 °C ambient, extending service life in enclosed chassis. |
Use Scenario: Shielding gate drivers in smart washing machine inverters from flyback spikes generated by BLDC motor commutation. IC Role / Device Role / Timing Role: Localized TVS across half-bridge high-side FET source-drain, triggered by dV/dt exceeding 22.2 V. Use Value: Prevents false triggering of overvoltage protection circuits while surviving >100,000 surge cycles per IEC 61000-4-4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20AHM3_B/H | Halogen-free, RoHS-compliant, AEC-Q101 qualified - identical electrical specs but different material composition. | No functional difference; selected when halogen-free compliance is mandated by OEM environmental policy. | Choose SMBJ20AHM3_B/H if halogen-free materials are required; otherwise SMBJ20AHE3_B/H satisfies standard automotive and industrial needs. |
| SMBJ20A-E3/52 | Commercial-grade (non-AEC-Q101), same SMB package and electrical parameters; RoHS-compliant but not automotive-qualified. | Approved for consumer and industrial equipment where automotive reliability validation is unnecessary. | Select SMBJ20A-E3/52 for cost-sensitive non-automotive designs; SMBJ20AHE3_B/H adds qualification assurance for mission-critical systems. |
Compared with SMBJ20AHM3_B/H, the SMBJ20AHE3_B/H offers identical surge performance but uses standard RoHS-compliant materials instead of halogen-free compounds; versus SMBJ20A-E3/52, it provides documented AEC-Q101 qualification essential for automotive Tier 1 supply chains.
Availability
SMBJ20AHE3_B/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor modules, telecom power inputs, and appliance motor drives requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for SMBJ20AHE3_B/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, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series was engineered for high-energy transient suppression in space-constrained, high-reliability applications - particularly automotive power distribution, industrial automation, and communications infrastructure where consistent clamping and thermal stability are critical.
FAQ
What is the polarity configuration of SMBJ20AHE3_B/H?
The SMBJ20AHE3_B/H is a unidirectional transient voltage suppressor diode, with the cathode identified by a visible band on the SMB (DO-214AA) package body. This polarity must be observed during PCB layout - connecting the cathode to the protected line and anode to ground ensures proper clamping action during positive-going transients. Reverse orientation prevents conduction and may result in catastrophic failure under overvoltage conditions.
Does SMBJ20AHE3_B/H meet automotive qualification standards?
Yes, SMBJ20AHE3_B/H is AEC-Q101 qualified, as confirmed in Vishay's ordering information and mechanical data section. This qualification covers stress tests including temperature cycling, humidity bias, and high-temperature operating life - validating its suitability for under-hood and cabin-mounted automotive electronics such as body control modules and ADAS sensor interfaces.
What is the maximum clamping voltage for SMBJ20AHE3_B/H under surge conditions?
The SMBJ20AHE3_B/H has a maximum clamping voltage (VC) of 32.4 V at 18.5 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per standard test conditions and represents the upper voltage limit imposed on protected circuitry during worst-case surge events - critical for ensuring compatibility with 3.3 V, 5 V, or 24 V system rails.
Can SMBJ20AHE3_B/H be used in bidirectional protection applications?
No, SMBJ20AHE3_B/H is strictly unidirectional. For bidirectional transient suppression, Vishay specifies part numbers with "CA" suffix (e.g., SMBJ20CA). Using SMBJ20AHE3_B/H in bidirectional configurations will result in forward conduction during negative transients, potentially damaging the device and failing to protect downstream components.
What is the thermal resistance specification for SMBJ20AHE3_B/H?
The SMBJ20AHE3_B/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes still air conditions and guides thermal design - for sustained power dissipation above 500 mW, additional copper area or airflow should be considered to maintain TJ ≤ 150 °C.
SMBJ20AHE3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ20AHE3_B/H FAQ
1.How can I place an order for SMBJ20AHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20AHE3_B/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_B/H reliable?
The price and inventory of SMBJ20AHE3_B/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_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ20AHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20AHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20AHE3_B/H?
SMBJ20AHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20AHE3_B/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_B/H?
For technical support, including SMBJ20AHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20AHE3_B/H requirements.
6.How does Aetrix verify that SMBJ20AHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ20AHE3_B/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_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ20AHE3_B/H?
All SMBJ20AHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20AHE3_B/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_B/H part is unused and in its original packaging.
Return procedure for SMBJ20AHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20AHE3_B/H Tags
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