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Vishay General Semiconductor - Diodes Division SMBJ20AHE3_B/I
- Part No.:
- SMBJ20AHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20AHE3_B/I.pdf
- Description:
- 600W,20V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,253
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Product details
Overview
SMBJ20AHE3_B/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against ESD and surge transients. 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 (IPPM), and 600 W peak pulse power (10/1000 µs waveform), commonly used for MOSFET gate protection and I/O line safeguarding in industrial power supplies.
For engineers reviewing the SMBJ20AHE3_B/I datasheet, SMBJ20AHE3_B/I pinout, SMBJ20AHE3_B/I application, or SMBJ20AHE3_B/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), clamping performance under 10/1000 µs surges, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches rapidly (<1 ns response) to divert surge energy away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (≤1.0 µA at VWM), while the SMB package supports high surge current handling (100 A IFSM) without thermal runaway under repetitive 8.3 ms half-sine stress.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards - enabling robust reliability in automotive-grade power conversion and sensor interface designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 24 V rail protection. |
| VBR min/max | 22.2 V / 24.5 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across production lot and temperature. |
| VC @ IPPM | 32.4 V at 18.5 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 600 W - Peak pulse power handling capability; validates suitability for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity. |
| IFSM | 100 A - Non-repetitive forward surge rating (8.3 ms half-sine); supports inrush current tolerance in DC input stages. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or enclosed industrial enclosures. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" pads; informs derating requirements above 25 °C ambient. |
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), 0.220" × 0.155" × 0.086". Matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential node in unidirectional configuration; carries surge current during clamping. |
| Cathode | Reverse-biased terminal | Marked with band; connected to protected line (e.g., 24 V supply rail); defines polarity-sensitive placement on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive powertrain and body electronics; includes temperature cycling, humidity bias, and surge lifetime testing. |
| 600 W peak pulse power (10/1000 µs) | Enables single-device compliance with IEC 61000-4-5 surge test requirements up to Level 3 in compact SMB footprint. |
| Glass passivated junction | Ensures stable VBR over time and temperature; reduces parameter drift in long-life industrial applications. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies SMT manufacturing logistics. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., inductive switch-off), improving protection margin for 3.3 V/5 V logic interfaces. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and feedback sensing lines against commutation spikes in 24 V BLDC motor controllers. IC Role / Device Role / Timing Role: Shunt clamping element placed directly across MOSFET gate-source or op-amp input pins. Use Value: Limits transient voltage to ≤32.4 V, preventing gate oxide rupture and analog front-end latch-up during 100 ns–1 µs edge events. | Use Scenario: Surge suppression on LIN bus lines and power inputs of door module ECUs exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V supply rails and bidirectional signal paths. Use Value: Withstands 100 A IFSM and maintains <1 µA leakage at 20 V, ensuring low quiescent current and long-term reliability in always-on modules. |
| Telecom Power Supplies | Consumer Appliance Control Boards |
Use Scenario: Input-stage protection for AC/DC adapters and PoE injectors subjected to lightning-induced surges on primary-side DC links. IC Role / Device Role / Timing Role: First-line transient suppressor between rectifier output and bulk capacitor. Use Value: 600 W PPPM rating allows absorption of 1.2/50 µs open-circuit surges up to 1.5 kV without degradation, per IEC 61000-4-5. | Use Scenario: ESD and EFT protection on user-interface buttons, display backlight drivers, and relay coil flyback paths in washing machines and HVAC controllers. IC Role / Device Role / Timing Role: Localized clamping device mounted adjacent to connectors and switching nodes. Use Value: Fast <1 ns response and 32.4 V VC ensure microcontroller GPIOs remain within absolute maximum ratings during 8 kV contact discharge events. |
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/I | Halogen-free variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free compliance is mandated by OEM environmental policy. | Choose SMBJ20AHM3_B/I if RoHS + halogen-free material declaration is required; otherwise SMBJ20AHE3_B/I suffices. |
| SMCJ20AHE3_A/H | Larger SMC (DO-214AB) package; same VWM/VBR/VC but higher RθJA (60 °C/W) and 1500 W PPPM. | Better thermal performance and surge margin; requires larger PCB area and different pad layout. | Choose SMCJ20AHE3_A/H only when 600 W is insufficient or board space permits larger footprint for enhanced reliability. |
Compared with SMBJ20AHE3_B/I, SMBJ20AHM3_B/I offers identical protection performance with halogen-free construction, while SMCJ20AHE3_A/H delivers higher surge capacity in a larger package - making SMBJ20AHE3_B/I optimal for space-constrained, AEC-Q101–required 24 V systems where 600 W clamping suffices.
Availability
SMBJ20AHE3_B/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supplies requiring stable component supply, AEC-Q101 qualification, and RoHS compliance.
Supply support for SMBJ20AHE3_B/I 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 automotive-grade validation.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting 12 V/24 V automotive, industrial automation, and telecom infrastructure where compact size, high surge rating, and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMBJ20AHE3_B/I at its rated peak pulse current?
The SMBJ20AHE3_B/I has a maximum clamping voltage (VC) of 32.4 V at 18.5 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs like microcontrollers or gate drivers remain within their absolute maximum ratings.
Is SMBJ20AHE3_B/I qualified for automotive applications?
Yes, SMBJ20AHE3_B/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in datasheet 88392. This qualification covers stress tests including temperature cycling, high-temperature operating life, and surge endurance - validating its use in automotive body electronics, power distribution units, and engine control peripherals where reliability under thermal and electrical stress is essential.
What does the "B/I" suffix mean in SMBJ20AHE3_B/I?
The "B/I" suffix in SMBJ20AHE3_B/I indicates packaging and reel configuration: "B" denotes the revision level (Revision B per Vishay's internal change control), and "I" specifies 13-inch diameter plastic tape-and-reel delivery with 3200 units per reel. This format supports high-volume SMT assembly and is distinct from the "H" variant (7-inch reel, 750 units), enabling optimized logistics for production-scale builds.
How does SMBJ20AHE3_B/I differ from bidirectional variants like SMBJ20CA?
SMBJ20AHE3_B/I is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse conduction must be blocked. In contrast, SMBJ20CA is bidirectional, symmetric in both directions, and used for AC signal lines or differential buses. Their VBR and VC values differ: SMBJ20AHE3_B/I has VBR = 22.2–24.5 V (reverse only), while SMBJ20CA exhibits matched breakdown in both polarities - making them non-interchangeable without circuit redesign.
What is the thermal resistance of SMBJ20AHE3_B/I, and how does it affect layout design?
SMBJ20AHE3_B/I 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 dictates PCB copper area requirements: reducing pad size increases thermal impedance, risking junction overheating during repetitive surges. For sustained operation above 70 °C ambient, designers must either increase copper area or apply derating per Figure 2 in datasheet 88392 to maintain TJ ≤ 150 °C.
SMBJ20AHE3_B/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- 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/I FAQ
1.How can I place an order for SMBJ20AHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20AHE3_B/I 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/I reliable?
The price and inventory of SMBJ20AHE3_B/I 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/I is usually 5 days.
3.What payment methods are accepted for SMBJ20AHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20AHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20AHE3_B/I?
SMBJ20AHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20AHE3_B/I 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/I?
For technical support, including SMBJ20AHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20AHE3_B/I requirements.
6.How does Aetrix verify that SMBJ20AHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ20AHE3_B/I 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/I meets industry standards.
7.What is the process for return or replacement of SMBJ20AHE3_B/I?
All SMBJ20AHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20AHE3_B/I, 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/I part is unused and in its original packaging.
Return procedure for SMBJ20AHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20AHE3_B/I Tags
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