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Vishay General Semiconductor - Diodes Division SMBJ20AHE3_A/I
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- Part No.:
- SMBJ20AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20AHE3_A/I.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,847
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Product details
Overview
SMBJ20AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails 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), commonly deployed in industrial motor drives and automotive body control modules.
For engineers reviewing the SMBJ20AHE3_A/I datasheet, SMBJ20AHE3_A/I pinout, SMBJ20AHE3_A/I application, or SMBJ20AHE3_A/I equivalent, key selection criteria include clamping performance under 10/1000 µs surge, AEC-Q101 qualification status, unidirectional polarity with cathode band marking, and thermal resistance (RθJA = 100 °C/W) for PCB layout thermal management.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert surge current away from downstream ICs or MOSFETs. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM).
The device is rated for 100 A non-repetitive forward surge (IFSM, 8.3 ms half-sine) and supports operation from –55 °C to +150 °C junction temperature. Its MSL Level 1 rating (JEDEC J-STD-020) and matte tin-plated leads ensure compatibility with standard SMT reflow profiles up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 22.2–24.5 V at 1 mA - Confirmed avalanche initiation range; ensures reliable turn-on during transients without premature conduction. |
| VC (Clamping Voltage) | 32.4 V at IPPM = 18.5 A - Peak voltage seen by protected circuit during 10/1000 µs surge; directly limits stress on downstream components. |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy absorption capability per IEC 61000-4-5 surge waveform; enables protection against lightning-induced surges. |
| ID (Reverse Leakage) | ≤1.0 µA at 20 V - Minimal standby power loss and signal integrity impact in high-impedance circuits. |
| TJ max. | +150 °C - Enables deployment in under-hood automotive or high-temperature industrial environments without derating. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs minimum PCB copper area requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with cathode band marking on unidirectional variants. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); terminals are matte tin-plated for J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge current return path | Connected to ground or low-side reference; completes shunt path during reverse-biased clamping event. |
| Cathode | Protected line connection / Surge current sink | Connected to the line being protected (e.g., 24 V rail); avalanche conduction occurs between cathode and anode when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including BCM, lighting, and infotainment; supports PPAP documentation and long-term reliability requirements. |
| 600 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-to-earth) without degradation when mounted per recommended pad layout. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage across temperature and lifetime; eliminates risk of junction corrosion in humid environments. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without pre-baking; reduces manufacturing complexity and cost. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD or inductive switch-off), improving protection fidelity. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 24 V DC input rails against inductive kickback from relay coils and solenoid drivers. IC Role / Device Role: Shunt clamping element placed between rail and ground, triggered by >22.2 V transients. Use Value: Limits rail voltage to ≤32.4 V during 18.5 A surge events, preventing damage to MCU power supplies and gate drivers. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins from load dump and jump-start transients. IC Role / Device Role: Unidirectional TVS connected cathode-to-LIN line, anode-to-ground to clamp negative-going spikes. Use Value: Maintains signal integrity by suppressing transients while adding <1.0 µA leakage at 12 V nominal supply. |
| Telecom Power Supplies | Consumer Appliance Control Boards |
Use Scenario: Input-stage protection for 48 V PoE-powered equipment exposed to lightning-induced surges on Ethernet cables. IC Role / Device Role: Primary clamping device on DC input before DC/DC converter, coordinated with upstream gas discharge tube. Use Value: Absorbs 600 W surge energy without failure, enabling compliance with IEC 61000-4-5 Ed. 3 Class 3 immunity. |
Use Scenario: Overvoltage safeguard for microcontroller reset and programming pins in washing machine main control boards. IC Role / Device Role: Low-capacitance (typ. 150 pF at 0 V) unidirectional suppressor placed directly at MCU pin. Use Value: Prevents latch-up or gate oxide rupture during ESD events (IEC 61000-4-2 ±8 kV contact) with sub-ns response time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20AHM3_A/I | 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 automotive Tier 1 programs). | Direct material substitution when halogen-free content is required; same footprint, thermal, and electrical behavior. |
| SMCJ20AHE3_A/I | Same VWM/VBR/VC specs but in larger SMC (DO-214AB) package; higher RθJA (60 °C/W) and 1500 W PPPM rating. | Used where higher surge energy handling is needed and board space allows larger footprint; not drop-in due to different pad layout. | Choose when system-level surge testing exceeds 600 W; requires PCB redesign for SMC pad pattern and thermal relief. |
Compared with SMBJ20AHE3_A/I, SMBJ20AHM3_A/I offers identical protection performance with halogen-free construction, while SMCJ20AHE3_A/I delivers 2.5× higher surge power handling at the cost of larger size and incompatible mounting.
Availability
SMBJ20AHE3_A/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supplies requiring stable component supply with AEC-Q101 qualification and RoHS compliance.
Supply support for SMBJ20AHE3_A/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, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where consistent clamping and long-term stability are critical.
FAQ
What is the clamping voltage of SMBJ20AHE3_A/I at its rated peak pulse current?
The SMBJ20AHE3_A/I has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current (IPPM) of 18.5 A under the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on the protected circuit during surge events. The SMBJ20AHE3_A/I maintains this clamping performance across its full operating temperature range (–55 °C to +150 °C), ensuring consistent protection in demanding environments.
Is SMBJ20AHE3_A/I qualified for automotive applications?
Yes, SMBJ20AHE3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in datasheet revision 09-Jan-2024. This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD, making SMBJ20AHE3_A/I suitable for automotive body electronics, infotainment systems, and powertrain peripherals where reliability under thermal and mechanical stress is mandatory.
How does the SMBJ20AHE3_A/I differ from bidirectional variants like SMBJ20CA?
The SMBJ20AHE3_A/I is unidirectional, featuring a cathode band and conducting only in reverse bias above VBR, whereas SMBJ20CA is bidirectional with symmetrical clamping in both polarities and no polarity marking. SMBJ20AHE3_A/I exhibits lower leakage (<1.0 µA at 20 V) and supports forward surge current (IFSM = 100 A), unlike SMBJ20CA. Use SMBJ20AHE3_A/I for DC rail protection where polarity is fixed; choose SMBJ20CA only for AC or dual-polarity signal line protection.
What is the thermal resistance and how does it affect PCB layout for SMBJ20AHE3_A/I?
The SMBJ20AHE3_A/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 assumes minimal copper; increasing pad area or adding thermal vias reduces RθJA, lowering junction temperature rise during sustained power dissipation. For designs operating near PD = 5.0 W, PCB layout must allocate sufficient copper to maintain TJ ≤ 150 °C under worst-case ambient conditions.
Can SMBJ20AHE3_A/I be used in place of SMAJ20AHE3?
No - SMBJ20AHE3_A/I and SMAJ20AHE3 are not interchangeable. While both are unidirectional TVS diodes with 20 V VWM, the SMBJ series uses the SMB (DO-214AA) package (4.57 mm × 3.94 mm), whereas SMAJ uses the smaller SMA (DO-214AC) package (4.57 mm × 2.79 mm). Their pad layouts, thermal performance (RθJA differs), and peak pulse ratings (SMAJ = 400 W vs. SMBJ = 600 W) are distinct. Substituting SMBJ20AHE3_A/I for SMAJ20AHE3 requires PCB redesign and validation of clamping and thermal behavior.
SMBJ20AHE3_A/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:
- 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/I FAQ
1.How can I place an order for SMBJ20AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20AHE3_A/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_A/I reliable?
The price and inventory of SMBJ20AHE3_A/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_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ20AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20AHE3_A/I?
SMBJ20AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20AHE3_A/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_A/I?
For technical support, including SMBJ20AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20AHE3_A/I requirements.
6.How does Aetrix verify that SMBJ20AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ20AHE3_A/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_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ20AHE3_A/I?
All SMBJ20AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20AHE3_A/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_A/I part is unused and in its original packaging.
Return procedure for SMBJ20AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20AHE3_A/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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