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Vishay General Semiconductor - Diodes Division SMBJ20CAHM3/H
- Part No.:
- SMBJ20CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20CAHM3/H.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,698
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Product details
Overview
SMBJ20CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. 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, and 600 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMBJ20CAHM3/H datasheet, SMBJ20CAHM3/H pinout, SMBJ20CAHM3/H application, or SMBJ20CAHM3/H equivalent, this device is selected for robust overvoltage protection on DC power rails, signal lines, and I/O interfaces in industrial control, automotive ECUs, and telecom infrastructure where bidirectional surge immunity and halogen-free RoHS compliance are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling clamp-on-both-sides protection without polarity sensitivity-ideal for AC-coupled or floating signal paths. Its glass-passivated junction ensures stable VBR tolerance (±5%), low incremental surge resistance, and fast response time (<1 ns) to transient events.
The device is rated for 150 °C maximum junction temperature, meets MSL Level 1 per J-STD-020 (260 °C reflow peak), and supports automated SMT placement. Its thermal resistance (RθJA = 100 °C/W) assumes 0.2" × 0.2" copper pads per terminal, defining practical PCB layout constraints for sustained power dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe DC bias margin. |
| VBR (min/max) | 22.2 V / 24.5 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above normal operating voltage. |
| VC @ IPPM | 32.4 V at 18.5 A - Clamped voltage during 600 W transient; determines protected circuit's maximum stress level. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; validates suitability for IEC 61000-4-5 Level 4 surges. |
| IPPM | 18.5 A - Peak pulse current capability; sets minimum trace width and fuse coordination requirements. |
| TJ max. | 150 °C - Maximum junction temperature; constrains ambient derating and heatsinking for repeated surge events. |
| Package | SMB (DO-214AA) - Standardized 2-pin SMD outline (5.21 mm × 4.06 mm × 2.20 mm); compatible with JEDEC MS-012AC footprint. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Connects to protected line; conducts surge current toward ground or rail during either polarity event. |
| Cathode | Transient return path (bidirectional) | Identical function to Anode; symmetric terminals enable orientation-agnostic PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals or ungrounded buses without polarity concerns. |
| 600 W peak pulse power (10/1000 µs) | Supports high-energy surge standards including IEC 61000-4-5 up to 4 kV open-circuit test levels. |
| Halogen-free, RoHS-compliant (HM3 suffix) | Fulfills environmental compliance for automotive and industrial OEMs requiring material declarations per IEC 61249-2-21. |
| MSL Level 1, 260 °C reflow peak | Permits standard lead-free reflow without preconditioning or special handling. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage exposure to downstream ICs compared to higher-ratio alternatives. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of 24 V DC power inputs and CAN/LIN bus lines against load dump and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector entry point to shunt transients before reaching MCU or transceiver ICs. Use Value: Prevents latch-up or gate oxide damage in microcontrollers and communication ICs during 12 V/24 V system switching events. |
Use Scenario: Surge suppression on LIN bus and sensor supply lines in door modules and lighting controllers. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing repetitive 100 V/100 ns transients per ISO 7637-2 Pulse 1/2a without degradation. Use Value: Maintains signal integrity and extends lifetime of Hall-effect sensors and LED drivers under harsh vehicle E/E environments. |
| Telecom Power Feeds | Consumer USB-C Port Protection |
|
Use Scenario: Input-stage protection on 48 V PoE-powered equipment front-ends exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device upstream of DC-DC converters and Ethernet PHYs. Use Value: Limits transient voltage to ≤32.4 V, ensuring downstream silicon remains within absolute maximum ratings during 1.2/50 µs surges. |
Use Scenario: Bidirectional overvoltage guard on VBUS and CC lines of USB-C receptacles subjected to hot-plug ESD and cable-bend transients. IC Role / Device Role / Timing Role: Fast-response TVS co-located with ESD arrays to handle combined ESD + surge threats per IEC 61000-4-2/4-5. Use Value: Reduces need for multi-stage protection while meeting UL 62368-1 transient withstand requirements for end-user ports. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA-E3/52 | RoHS-compliant but not halogen-free; commercial grade only (no AEC-Q101 qualification). | Lacks automotive qualification and halogen-free certification; suitable for non-automotive industrial use. | Select when halogen-free content or AEC-Q101 compliance is not required, and cost optimization is prioritized. |
| SMCJ20CAHM3 | Higher power rating (1500 W), larger SMC (DO-214AB) package (7.11 mm × 6.22 mm), same VWM/VC. | Used where higher surge energy absorption is needed and board space allows larger footprint. | Choose when system-level surge testing exceeds 600 W requirements or when thermal margin must be increased via larger package. |
Compared with SMBJ20CAHM3/H, SMBJ20CA-E3/52 offers identical electrical performance but lacks halogen-free and automotive qualification, while SMCJ20CAHM3 provides greater surge headroom at the cost of PCB area and thermal profile-making SMBJ20CAHM3/H optimal for space-constrained, automotive-grade 600 W protection.
Availability
SMBJ20CAHM3/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply with halogen-free, AEC-Q101-qualified TVS protection.
Supply support for SMBJ20CAHM3/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 and application-specific performance.
The SMBJ series is engineered for high-reliability transient suppression in automotive, industrial, and telecom systems-delivering consistent clamping behavior, low leakage, and robust surge endurance in compact SMD packages.
FAQ
What is the clamping voltage of SMBJ20CAHM3/H at its rated peak pulse current?
The SMBJ20CAHM3/H has a maximum clamping voltage (VC) of 32.4 V at 18.5 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value defines the upper voltage limit imposed on protected circuits during surge events and is confirmed in Vishay's datasheet Document Number 88392, page 2. The SMBJ20CAHM3/H maintains this clamping performance across its full operating temperature range.
Is SMBJ20CAHM3/H qualified for automotive applications?
Yes, SMBJ20CAHM3/H is AEC-Q101 qualified, as indicated by the "HM3" suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). This qualification confirms its suitability for automotive electronic systems including body control modules, infotainment interfaces, and sensor nodes. The SMBJ20CAHM3/H undergoes stress testing per AEC-Q101 Rev D, including HTGB, HTRB, and temperature cycling.
What does the "CA" suffix mean in SMBJ20CAHM3/H?
The "CA" suffix in SMBJ20CAHM3/H denotes a bidirectional configuration-meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMBJ20A), SMBJ20CAHM3/H has no cathode marking and functions identically regardless of terminal orientation, making it ideal for AC-coupled or floating signal lines.
What is the maximum operating temperature for SMBJ20CAHM3/H?
The SMBJ20CAHM3/H has a maximum junction temperature (TJ) of +150 °C and an operating junction/storage temperature range of –55 °C to +150 °C. This rating enables reliable operation in under-hood automotive environments and industrial enclosures with elevated ambient temperatures. Derating curves in the datasheet show usable power limits down to 50% at 125 °C ambient.
How does SMBJ20CAHM3/H differ from SMBJ20A in practical design?
SMBJ20CAHM3/H is bidirectional with symmetrical clamping, while SMBJ20A is unidirectional and requires correct polarity placement (cathode band oriented toward positive rail). In designs with AC signals, floating grounds, or uncertain polarity, SMBJ20CAHM3/H eliminates orientation errors and simplifies layout-whereas SMBJ20A demands strict attention to cathode alignment and cannot protect reverse-polarity transients.
SMBJ20CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ20CAHM3/H FAQ
1.How can I place an order for SMBJ20CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20CAHM3/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 SMBJ20CAHM3/H reliable?
The price and inventory of SMBJ20CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMBJ20CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20CAHM3/H?
SMBJ20CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20CAHM3/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 SMBJ20CAHM3/H?
For technical support, including SMBJ20CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20CAHM3/H requirements.
6.How does Aetrix verify that SMBJ20CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ20CAHM3/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 SMBJ20CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMBJ20CAHM3/H?
All SMBJ20CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20CAHM3/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 SMBJ20CAHM3/H part is unused and in its original packaging.
Return procedure for SMBJ20CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20CAHM3/H Tags
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