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Vishay General Semiconductor - Diodes Division SMBJ20CAHM3_B/H
- Part No.:
- SMBJ20CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20CAHM3_B/H.pdf
- Description:
- 600W,20V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,759
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Product details
Overview
SMBJ20CAHM3_B/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients on power 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, 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 telecom line cards.
For engineers reviewing the SMBJ20CAHM3_B/H datasheet, SMBJ20CAHM3_B/H pinout, SMBJ20CAHM3_B/H application, or SMBJ20CAHM3_B/H equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.45), AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ at VWM), but triggers into low-impedance conduction when transient voltage exceeds VBR, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable leakage and repeatable breakdown behavior across temperature.
The SMBJ20CAHM3_B/H supports bidirectional protection without polarity sensitivity - symmetrical VBR and VC in both directions - making it suitable for AC-coupled lines, differential buses, and ungrounded sensor interfaces. Thermal resistance is RθJA = 100 °C/W (on recommended pad layout) and RθJL = 20 °C/W, enabling reliable operation up to TJ = +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before significant leakage; 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 transients; tight tolerance supports robust design margining. |
| VC @ IPPM | 32.4 V at 18.5 A - Clamping voltage limits stress on protected ICs; low VC/VWM ratio (1.62) minimizes overvoltage exposure. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; enables suppression of lightning-induced surges per IEC 61000-4-5 Level 3. |
| IPPM | 18.5 A - Peak surge current capacity; determines minimum trace width and PCB copper area required for safe energy dissipation. |
| TJ max. | +150 °C - Maximum junction temperature; allows use in under-hood automotive modules and high-ambient industrial enclosures. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with J-STD-020 reflow profiles up to 260 °C peak. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance. Bidirectional construction has no polarity marking - both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Both terminals serve identical roles in bidirectional operation; no cathode band marking; interchangeable in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential pairs, and floating grounds without external polarity management. |
| 600 W peak pulse power | Supports IEC 61000-4-5 surge immunity testing up to 1 kV open-circuit / 0.5 kV source impedance in industrial environments. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including body control modules and infotainment power rails; includes HTOL and temperature cycling data. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC JS709C; eliminates brominated flame retardants for safer end-of-life processing. |
| Low clamping ratio (VC/VBR) | ~1.45 - Minimizes overvoltage overshoot during fast transients, reducing risk of latch-up or gate oxide damage in protected MOSFETs. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
|
Use Scenario: Suppresses switching spikes from relay coils and DC-DC converter MOSFETs feeding microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Shunt TVS diode placed at input filter stage to clamp induced transients before they reach LDO regulators and logic ICs. Use Value: Prevents reset corruption and brown-out lockup by limiting voltage excursions to ≤32.4 V during 18.5 A surges. |
Use Scenario: Protects LIN bus interface and window motor driver circuits from load dump and jump-start events. IC Role / Device Role / Timing Role: Bidirectional clamping element across power rail and ground, absorbing ±100 V/50 ms pulses per ISO 7637-2 Pulse 5a. Use Value: Maintains system uptime by preventing ESD-triggered MCU resets and gate driver latch-up during vehicle battery transients. |
| Telecom Line Card Interface | Consumer Sensor Signal Conditioning |
|
Use Scenario: Shields Ethernet PHY magnetics and PoE controller inputs from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary surge suppression device on secondary side of isolation transformer, coordinated with gas discharge tube (GDT) front-end. Use Value: Limits let-through voltage to <35 V during 10/1000 µs surges, preserving PHY integrity without requiring additional series impedance. |
Use Scenario: Guards analog outputs of MEMS accelerometers and temperature sensors against ESD events during board handling and connector mating. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) shunt protector on 3.3 V analog output traces, placed adjacent to sensor IC pins. Use Value: Prevents sensor offset drift and ADC saturation by clamping 8 kV HBM ESD pulses to <33 V within <1 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 |
|---|---|---|---|
| SMBJ20CAHE3_B/H | Same electrical specs and SMB package, but RoHS-compliant commercial grade (E3) without halogen-free certification or AEC-Q101 qualification. | Lacks automotive qualification; suitable for industrial/commercial designs where halogen content and automotive reliability are not mandated. | Select SMBJ20CAHE3_B/H when cost optimization is prioritized and AEC-Q101/halogen-free requirements do not apply. |
| SMAJ20CAHM3 | Lower peak pulse power (400 W vs. 600 W); same VWM/VBR/VC ratings but in smaller SMA (DO-214AC) package with higher thermal resistance. | Reduced surge handling margin; limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only, not IEC 61000-4-5 surge). | Choose SMAJ20CAHM3 only when board space is constrained and surge threat level is limited to sub-400 W events. |
Compared with SMBJ20CAHE3_B/H, the SMBJ20CAHM3_B/H adds halogen-free construction and AEC-Q101 qualification without sacrificing clamping performance; versus SMAJ20CAHM3, it delivers 50% higher surge power handling and superior thermal dissipation in the larger SMB footprint.
Availability
SMBJ20CAHM3_B/H is available at Aetrix Electronics and suitable for industrial power supply protection, automotive body control modules, and telecom line card interface applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMBJ20CAHM3_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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated through proven clamping performance and qualification rigor.
FAQ
What is the clamping voltage of SMBJ20CAHM3_B/H at its rated peak pulse current?
The SMBJ20CAHM3_B/H has a maximum clamping voltage (VC) of 32.4 V at its rated peak pulse current (IPPM) of 18.5 A with a 10/1000 µs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ20CAHM3_B/H maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMBJ20CAHM3_B/H suitable for automotive applications?
Yes, SMBJ20CAHM3_B/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It is validated for use in body control modules, infotainment power rails, and LIN/CAN interface protection where sustained operation at +125 °C ambient and immunity to load dump transients per ISO 7637-2 are required. The SMBJ20CAHM3_B/H undergoes HTOL, temperature cycling, and mechanical shock testing per AEC-Q101 Rev D.
How does the bidirectional design of SMBJ20CAHM3_B/H affect PCB layout?
The SMBJ20CAHM3_B/H has no polarity marking and identical electrical characteristics in both directions, so PCB layout requires no orientation alignment - either terminal may connect to line or ground. This simplifies routing on differential pairs (e.g., RS-485, CAN), AC-coupled sensor outputs, or floating power domains. Layout must still follow Vishay's recommended 0.2" × 0.2" copper pad dimensions per terminal to ensure rated thermal and surge performance for the SMBJ20CAHM3_B/H.
What is the maximum steady-state power dissipation of SMBJ20CAHM3_B/H?
The SMBJ20CAHM3_B/H has a maximum steady-state power dissipation (PD) of 5.0 W at TA = 50 °C on an infinite heatsink. In typical SMB surface-mount applications with standard PCB copper, derating applies: at TA = 70 °C, PD drops to ~3.5 W. This rating governs continuous leakage power under elevated VWM bias and must be verified alongside thermal simulation for the final layout. The SMBJ20CAHM3_B/H is not intended for continuous forward conduction.
Does SMBJ20CAHM3_B/H meet any safety certifications?
Yes, SMBJ20CAHM3_B/H is Underwriters Laboratories (UL) recognized under file E136766 for both unidirectional and bidirectional transient suppressors, complying with UL 497B for primary protector classification. It also meets IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) immunity standards when applied per Vishay's recommended layout and coordination guidelines. These certifications are documented in Vishay's QVGQ2 listing and apply directly to the SMBJ20CAHM3_B/H part number.
SMBJ20CAHM3_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:
- -
- 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_B/H FAQ
1.How can I place an order for SMBJ20CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20CAHM3_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 SMBJ20CAHM3_B/H reliable?
The price and inventory of SMBJ20CAHM3_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 SMBJ20CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ20CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20CAHM3_B/H?
SMBJ20CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20CAHM3_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 SMBJ20CAHM3_B/H?
For technical support, including SMBJ20CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20CAHM3_B/H requirements.
6.How does Aetrix verify that SMBJ20CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ20CAHM3_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 SMBJ20CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ20CAHM3_B/H?
All SMBJ20CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20CAHM3_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 SMBJ20CAHM3_B/H part is unused and in its original packaging.
Return procedure for SMBJ20CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20CAHM3_B/H Tags
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