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Vishay General Semiconductor - Diodes Division SMB8J20CAHM3/H
- Part No.:
- SMB8J20CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J20CAHM3/H.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,686
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Product details
Overview
SMB8J20CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 20 V stand-off voltage (VWM), 32.4 V maximum clamping voltage (VC) at 24.7 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - optimized for automotive-grade ESD and load-dump protection in sensor interfaces and power rails.
For engineers reviewing the SMB8J20CAHM3/H datasheet, SMB8J20CAHM3/H pinout, SMB8J20CAHM3/H application, or SMB8J20CAHM3/H equivalent, this device is evaluated for robust transient suppression in AEC-Q101-compliant automotive subsystems, including CAN/LIN bus protection, battery monitoring circuits, and body control module I/O lines where low-leakage (<1 µA at VWM) and fast response (<1 ns) are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance, while the MSL Level 1 rating supports lead-free reflow up to 260 °C.
The device is qualified to AEC-Q101 for automotive use and features halogen-free, RoHS-compliant construction (HM3 suffix). Its thermal resistance (RθJL = 20 °C/W) and junction temperature range (–55 °C to +150 °C) support reliable operation under sustained transients in engine bay and under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 12 V automotive systems. |
| VBR (min/max) | 22.2 V / 24.5 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on during transients. |
| VC @ IPPM | 32.4 V - Clamping voltage at 24.7 A peak pulse current; limits downstream voltage stress during ISO 7637-2 Pulse 1/2a/5a events. |
| PPPM | 800 W - Peak pulse power handling with 10/1000 µs waveform; meets SAE J1113-11 Class III immunity requirements. |
| ID @ VWM | ≤1.0 µA - Reverse leakage at 20 V; minimizes standby power loss in always-on vehicle modules. |
| TJ max. | +150 °C - Maximum junction temperature; enables placement near heat sources like power converters or motor drivers. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. No polarity marking - bidirectional symmetry eliminates cathode/anode orientation concerns during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; clamps voltage surges regardless of polarity - simplifies PCB layout for differential or floating nodes. |
| Cathode Band (absent) | Polarity indicator | Not applicable - bidirectional construction omits band marking; verified by electrical symmetry in datasheet curves and test data. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood applications including temperature cycling, humidity bias, and mechanical shock per stress test plan. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental standards and JESD201 Class 2 whisker resistance for long-term reliability in vibration-prone assemblies. |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V or 5 V logic interfacing with 12 V supply domains. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C), eliminating bake requirements and streamlining SMT production. |
Applications
| Automotive Body Control Module (BCM) | Automotive Battery Monitoring Unit (BMU) |
|---|---|
Use Scenario: Protecting LIN bus transceivers and relay driver outputs from load dump and inductive switching spikes in door modules and lighting controls. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed at connector interface to shunt transients before reaching MCU GPIO or level-shifters. Use Value: Prevents latch-up or permanent damage to 5 V tolerant transceivers during 12 V system surges up to 800 W, maintaining communication integrity per LIN 2.2A spec. | Use Scenario: Safeguarding analog front-end inputs of fuel-cell or EV battery cell voltage monitors exposed to pack-level switching noise and ground bounce. IC Role / Device Role / Timing Role: High-precision clamping device on differential sense lines, ensuring <±0.5% measurement error remains unaffected by sub-100 ns transients. Use Value: Enables direct connection to ±20 V-rated ADC inputs without external attenuation, preserving resolution while meeting ISO 16750-2 pulse test requirements. |
| Industrial CAN FD Node Interface | Automotive HVAC Blower Motor Driver |
Use Scenario: Shielding CAN FD transceiver I/O pins against ESD (IEC 61000-4-2 ±15 kV) and burst noise (IEC 61000-4-4 ±2 kV) in factory automation gateways. IC Role / Device Role / Timing Role: First-line transient suppressor placed adjacent to transceiver pins, with low capacitance (<100 pF) avoiding signal integrity degradation at 5 Mbps. Use Value: Maintains bit error rate <10⁻¹² under repeated ESD strikes while supporting full CAN FD data phase timing budgets. | Use Scenario: Suppressing commutation spikes generated by brushed DC blower motors in climate control systems during PWM speed regulation. IC Role / Device Role / Timing Role: Energy-absorbing clamp across motor terminals and H-bridge flyback paths, rated for repetitive 800 W pulses without derating. Use Value: Eliminates need for snubber RC networks, reducing BOM count and board space while sustaining >100,000 cycle lifetime per SAE J1211. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J20CAHE3/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Preferred for non-automotive industrial use where halogen content is unrestricted. | Select when cost sensitivity outweighs halogen-free requirement and automotive traceability is not mandated. |
| SMAJ20CA | Lower PPPM (400 W), higher VC (34.0 V), SMA package (smaller footprint, lower thermal mass). | Suitable for space-constrained consumer electronics, not recommended for automotive load-dump duty cycles. | Choose only for low-energy transients in non-automotive designs where PCB area is critical and peak power <400 W. |
Compared with SMB8J20CAHE3/H and SMAJ20CA, SMB8J20CAHM3/H uniquely combines halogen-free compliance, 800 W surge capacity, and AEC-Q101 validation - making it the sole option for Tier 1 automotive suppliers requiring full material declaration and extended temperature survivability.
Availability
SMB8J20CAHM3/H is available at Aetrix Electronics and suitable for automotive body electronics, battery management systems, and industrial CAN FD node protection requiring stable component supply across multi-year production programs.
Supply support for SMB8J20CAHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in harsh automotive and industrial environments where consistent clamping performance and long-term stability are mandatory.
FAQ
What is the clamping voltage of SMB8J20CAHM3/H at its rated peak pulse current?
The SMB8J20CAHM3/H has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current (IPPM) of 24.7 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures protected circuitry remains below critical overvoltage thresholds during standardized surge events such as ISO 7637-2 Pulse 5a.
Is SMB8J20CAHM3/H suitable for protecting CAN bus lines?
Yes, SMB8J20CAHM3/H is suitable for CAN bus protection due to its bidirectional symmetry, low clamping ratio (VC/VBR ≈ 1.32), and junction capacitance under 100 pF at 1 MHz. It maintains signal integrity up to 5 Mbps CAN FD rates while meeting IEC 61000-4-2 ESD and IEC 61000-4-4 EFT immunity requirements when placed within 2 mm of the transceiver pins.
Does SMB8J20CAHM3/H require special handling during PCB assembly?
No special handling is required: SMB8J20CAHM3/H is rated MSL Level 1 per J-STD-020 and supports standard lead-free reflow profiles with peak temperature up to 260 °C. Its matte tin-plated leads comply with J-STD-002 and JESD22-B102, enabling robust solder joint formation without pre-baking or dry-pack requirements.
How does the HM3 suffix affect the compliance status of SMB8J20CAHM3/H?
The HM3 suffix indicates SMB8J20CAHM3/H is halogen-free, RoHS-compliant, and AEC-Q101 qualified - satisfying automotive material declarations (e.g., IMDS, ELV) and environmental regulations beyond baseline RoHS. It also passes JESD201 Class 2 whisker testing, confirming long-term interconnect reliability in vibration-intensive applications.
Can SMB8J20CAHM3/H replace unidirectional TVS diodes in existing designs?
SMB8J20CAHM3/H can replace unidirectional TVS diodes only if the circuit topology is inherently symmetrical (e.g., differential pairs, AC-coupled signals, or floating power rails). For single-ended DC lines with defined polarity, substitution requires verification that reverse-bias leakage and clamping behavior under negative transients meet system-level safety margins - consult the bidirectional V-I curve in Figure 4 of document 88422 before redesign.
SMB8J20CAHM3/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):
- 24.7A
- Power - Peak Pulse:
- 800W
- 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)
SMB8J20CAHM3/H FAQ
1.How can I place an order for SMB8J20CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J20CAHM3/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 SMB8J20CAHM3/H reliable?
The price and inventory of SMB8J20CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J20CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMB8J20CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J20CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J20CAHM3/H?
SMB8J20CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J20CAHM3/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 SMB8J20CAHM3/H?
For technical support, including SMB8J20CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J20CAHM3/H requirements.
6.How does Aetrix verify that SMB8J20CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMB8J20CAHM3/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 SMB8J20CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMB8J20CAHM3/H?
All SMB8J20CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J20CAHM3/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 SMB8J20CAHM3/H part is unused and in its original packaging.
Return procedure for SMB8J20CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J20CAHM3/H Tags
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