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Vishay General Semiconductor - Diodes Division SMBJ20HE3/5B
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- Part No.:
- SMBJ20HE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20HE3/5B.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,404
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Product details
Overview
SMBJ20HE3/5B 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 motor drives and telecom power supplies.
For engineers reviewing the SMBJ20HE3/5B datasheet, SMBJ20HE3/5B pinout, SMBJ20HE3/5B application, or SMBJ20HE3/5B equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (−55 to +150 °C), and compliance with UL 497B surge protector classification.
Technical Context
This TVS diode operates as a fast-acting shunt clamp during overvoltage events, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time. Its unidirectional configuration provides forward conduction only in one direction, with cathode band marking for polarity identification.
The device is rated for 600 W peak pulse power under 10/1000 µs waveform, derated above 25 °C per Fig. 2, and supports 100 A non-repetitive forward surge current (IFSM) at 8.3 ms half-sine. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (min/max) | 22.2 V / 24.5 V at IT = 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during transients. |
| VC @ IPPM | 32.4 V at 18.5 A - Clamped voltage seen by protected circuit during 600 W transient; limits stress on downstream components. |
| PPPM | 600 W - Peak pulse power handling capability with 10/1000 µs waveform; validates robustness against lightning-induced surges. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in high-ambient environments like engine control units. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs PCB thermal layout requirements. |
| IFSM | 100 A - Peak forward surge current rating (8.3 ms half-sine); supports protection of rectifier stages and DC bus inputs. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., ground or return path) in unidirectional clamping configuration. |
| Cathode | Reverse-biased terminal during normal operation | Connected to protected line (e.g., 24 V rail or signal input); conducts when transient exceeds VWM. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS power rails. |
| 600 W peak pulse power | Withstands high-energy transients per ISO 7637-2 and IEC 61000-4-5 test profiles without degradation. |
| Glass passivated junction | Ensures stable leakage performance and long-term reliability under thermal cycling and humidity stress. |
| MSL Level 1 rating | Allows unlimited floor life and reflow compatibility up to 260 °C peak, supporting automated SMT assembly. |
| UL 497B recognized | Qualified as a listed surge protector (QVGQ2, E136766), enabling use in certified telecom and industrial equipment. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Protection of gate drivers and IGBT collector-emitter paths against switching-induced voltage spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamps positive transients on DC bus and control lines during PWM switching transitions. Use Value: Limits VCE overshoot to ≤32.4 V, preventing IGBT latch-up and extending system MTBF in 48 V and 72 V drive systems. |
Use Scenario: Input-stage surge suppression on AC/DC front-end rectifiers and DC distribution rails. IC Role / Device Role / Timing Role: Fast-response shunt element absorbing 600 W transients from lightning-induced surges on -48 V telecom power feeds. Use Value: Maintains <1 µA leakage at 20 V, minimizing standby power loss while clamping to 32.4 V within nanoseconds. |
| Automotive Body Control Modules | Industrial Sensor Signal Conditioning |
|
Use Scenario: Reverse battery and load dump protection on LIN bus and power inputs in BCMs. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to chassis ground, activated during 12 V system overvoltage events. Use Value: Withstands 100 A surge (8.3 ms) per ISO 16750-2, meeting OEM requirements for 12 V vehicle platforms. |
Use Scenario: ESD and EFT protection on analog outputs (e.g., 4–20 mA loops) and digital sensor interfaces (I²C, SPI). IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) shunt device placed directly at connector entry points. Use Value: Clamps transients to 32.4 V without distorting 10 kHz sensor signals, preserving measurement accuracy in PLC modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A-E3/5B | Commercial-grade (non-AEC-Q101), same VWM/VC/PPPM, identical SMB package and pinout. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select SMBJ20A-E3/5B for cost-sensitive non-automotive applications requiring identical electrical specs. |
| SMAJ20AHE3/A | Lower power rating (400 W), SMA package (smaller footprint), higher RθJA (140 °C/W), same VWM and VC. | Reduced surge handling; appropriate for space-constrained layouts with lower energy threat profiles. | Choose SMAJ20AHE3/A only when board area is critical and peak transient energy remains ≤400 W. |
Compared with SMBJ20A-E3/5B, SMBJ20HE3/5B adds AEC-Q101 qualification and UL 497B recognition without sacrificing clamping performance; versus SMAJ20AHE3/A, it delivers 50 % higher pulse power and superior thermal dissipation in the same mounting orientation.
Availability
SMBJ20HE3/5B is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and industrial sensor signal conditioning requiring stable component supply across production lifecycles.
Supply support for SMBJ20HE3/5B 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, efficiency, and application-specific validation.
The SMBJ series was developed for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where AEC-Q101 compliance and UL recognition are mandatory.
FAQ
What is the clamping voltage of SMBJ20HE3/5B at its rated peak pulse current?
The SMBJ20HE3/5B has a maximum clamping voltage (VC) of 32.4 V at 18.5 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuits during surge events. The SMBJ20HE3/5B maintains this clamping performance across its full operating temperature range (−55 to +150 °C), ensuring consistent protection in demanding environments.
Is SMBJ20HE3/5B qualified for automotive applications?
Yes, SMBJ20HE3/5B is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in the SMBJ5.0A–SMBJ188A datasheet (Rev. 09-Jan-2024, Doc. #88392). This qualification covers stress tests including HTGB, HTRB, TCT, and mechanical shock, validating its suitability for under-hood and chassis-mounted automotive systems. The SMBJ20HE3/5B also carries UL 497B recognition (E136766), further supporting its use in certified automotive electronics.
What is the thermal resistance of SMBJ20HE3/5B, and how does it affect PCB layout?
The SMBJ20HE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB construction and dictates minimum copper area required to maintain junction temperature within the −55 to +150 °C limit during repetitive surge events. To optimize thermal performance, designers should avoid narrow traces and ensure direct thermal vias connect pads to internal ground planes - especially critical in high-duty-cycle applications like motor drive snubbers where the SMBJ20HE3/5B may experience multiple surges per second.
How does SMBJ20HE3/5B differ from bidirectional variants like SMBJ20CA?
The SMBJ20HE3/5B is unidirectional, meaning it conducts only in reverse bias above VBR and blocks forward current beyond ~3.5 V (VF max at 50 A). In contrast, SMBJ20CA is bidirectional with symmetrical clamping in both polarities, making it suitable for AC lines or differential signal pairs. The SMBJ20HE3/5B uses a cathode band for polarity identification and is optimized for DC rail protection, whereas SMBJ20CA has no polarity marking and exhibits doubled reverse leakage (ID) at VWM for VWM ≤10 V - a distinction that does not apply to the 20 V variant but reflects fundamental structural differences between unidirectional and bidirectional TVS topologies.
What packaging and reel options are available for SMBJ20HE3/5B?
SMBJ20HE3/5B is supplied in 13" diameter plastic tape and reel format with a base quantity of 3200 units per reel (ordering code suffix "/5B"). The device uses standard SMB (DO-214AA) packaging with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. It meets JESD 201 Class 2 whisker resistance and is rated MSL Level 1 per J-STD-020, allowing unlimited floor life and compatibility with lead-free reflow profiles peaking at 260 °C. No alternate packaging (e.g., cut tape or tray) is specified for this variant in Vishay's official ordering information.
SMBJ20HE3/5B 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:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 16.8A
- 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)
SMBJ20HE3/5B FAQ
1.How can I place an order for SMBJ20HE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20HE3/5B 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 SMBJ20HE3/5B reliable?
The price and inventory of SMBJ20HE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20HE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ20HE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20HE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20HE3/5B?
SMBJ20HE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20HE3/5B 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 SMBJ20HE3/5B?
For technical support, including SMBJ20HE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20HE3/5B requirements.
6.How does Aetrix verify that SMBJ20HE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ20HE3/5B 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 SMBJ20HE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ20HE3/5B?
All SMBJ20HE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20HE3/5B, 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 SMBJ20HE3/5B part is unused and in its original packaging.
Return procedure for SMBJ20HE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20HE3/5B Tags
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