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Vishay General Semiconductor - Diodes Division SMB8J20CAHM3_A/H
- Part No.:
- SMB8J20CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J20CAHM3_A/H.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,102
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Product details
Overview
SMB8J20CAHM3_A/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 (10/1000 µs waveform), making it suitable for automotive sensor interface and industrial I/O line protection.
For engineers reviewing the SMB8J20CAHM3_A/H datasheet, SMB8J20CAHM3_A/H pinout, SMB8J20CAHM3_A/H application, or SMB8J20CAHM3_A/H equivalent, key selection considerations include its AEC-Q101 qualification, bidirectional polarity, low clamping ratio (VC/VWM = 1.62), and halogen-free RoHS-compliant construction under HM3 suffix.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown behavior in both directions, enabling robust ESD and lightning surge suppression without polarity sensitivity. Its glass-passivated junction ensures stable leakage performance (<1.0 µA at VWM) and fast response time (<1 ns), critical for safeguarding sensitive analog and digital inputs.
The SMB8J20CAHM3_A/H is rated for -55 °C to +150 °C operating junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its thermal resistance (RθJA = 72 °C/W) supports reliable operation on standard 0.2" × 0.2" copper pads, and its 1.0 mm minimum cathode band width aligns with automated optical inspection requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range. |
| VBR min / max | 22.2 V / 24.5 V - Breakdown occurs within this range at 1 mA test current; ensures consistent turn-on threshold. |
| VC @ IPPM | 32.4 V - Clamped voltage during 24.7 A 10/1000 µs surge; determines protected circuit's maximum stress level. |
| IPPM | 24.7 A - Peak surge current capability under standard waveform; defines single-event energy handling (800 W). |
| Leakage ID | ≤1.0 µA at 20 V - Ultra-low reverse leakage preserves signal integrity and battery life in always-on circuits. |
| TJ max | +150 °C - Enables use in under-hood automotive environments and thermally constrained industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminals require no orientation during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Surge current path | Both terminals function identically; bidirectional conduction enables single-device protection of AC or floating lines. |
| Case (body) | Thermal and mechanical interface | Plastic body with UL 94 V-0 rating; transfers heat to PCB copper pads (0.2" × 0.2" recommended per terminal). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics including engine control modules and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and JESD201 Class 2 whisker resistance for long-term solder joint reliability. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage exposure to downstream ICs-critical for 3.3 V and 5 V logic protection. |
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage across temperature and lifetime, reducing field failure risk. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without pre-baking, simplifying SMT manufacturing. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and pressure/temperature sensor outputs from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt transients before reaching ASIC or MCU input pins. Use Value: Withstands 800 W surges while clamping below 33 V, preserving 5 V tolerant sensor interface ICs and meeting OEM EMC immunity requirements. |
Use Scenario: Safeguarding PLC digital input channels against inductive kickback from solenoid and relay coils. IC Role / Device Role / Timing Role: Fast-acting TVS placed across input terminals to limit voltage spikes to safe levels during coil de-energization. Use Value: 24.7 A IPPM and 32.4 V VC ensure reliable suppression of 100–200 V, 100 ms transients common in factory automation systems. |
| USB Type-C Port Protection | Telecom Line Interface |
|
Use Scenario: Guarding USB-C CC and VBUS lines against ESD and hot-swap transients in docking stations and peripherals. IC Role / Device Role / Timing Role: Bidirectional TVS mounted adjacent to connector to absorb ±15 kV contact ESD (IEC 61000-4-2) and 10/1000 µs surges. Use Value: Sub-1 ns response and <1 µA leakage prevent signal distortion on high-speed data lines while maintaining low standby power. |
Use Scenario: Protecting Ethernet PHY front-end and POTS line drivers from lightning-induced surges in network edge equipment. IC Role / Device Role / Timing Role: Primary surge limiter on twisted-pair lines, coordinated with GDT or MOV secondary protection stages. Use Value: 800 W rating and 72 °C/W RθJA enable sustained surge handling without thermal runaway in sealed telecom enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J20CAHE3_A/H | Same electrical specs, but RoHS-compliant commercial grade (E3) without halogen-free certification. | Lacks JESD201 Class 2 whisker resistance; not approved for automotive under hood or high-reliability industrial use. | Select when halogen-free requirement is absent and cost optimization is prioritized over automotive qualification. |
| SMAJ20CA | Lower power rating (400 W), smaller SMA package (DO-214AC), higher VC (34.0 V), same VWM. | Insufficient for 800 W surge events; limited thermal mass reduces repetitive surge endurance. | Choose only for space-constrained, lower-energy applications where PCB area is critical and surge threat level is reduced. |
Compared with SMB8J20CAHE3_A/H and SMAJ20CA, the SMB8J20CAHM3_A/H uniquely combines AEC-Q101 qualification, halogen-free compliance, and 800 W surge capacity in the SMB footprint-making it the only option qualified for automotive-grade surge protection without layout or BOM revision.
Availability
SMB8J20CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, USB-C peripheral protection, and telecom line driver circuits requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMB8J20CAHM3_A/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 SMB8JxxCA series targets high-reliability transient suppression in automotive and industrial environments, engineered to meet stringent AEC-Q101 and RoHS/halogen-free mandates while delivering consistent clamping performance across temperature and lifetime.
FAQ
What is the clamping voltage of SMB8J20CAHM3_A/H at its rated peak pulse current?
The SMB8J20CAHM3_A/H has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current of 24.7 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's Document Number 88422. The low clamping ratio (VC/VWM = 1.62) ensures effective protection for 3.3 V and 5 V logic interfaces without overstressing downstream components. SMB8J20CAHM3_A/H maintains this performance across its full operating temperature range.
Is SMB8J20CAHM3_A/H suitable for automotive applications?
Yes, SMB8J20CAHM3_A/H is AEC-Q101 qualified and specifically designated for automotive use via the HM3 suffix and "_A/H" revision code. It undergoes rigorous stress testing-including temperature cycling, high-temperature reverse bias, and ESD-to meet automotive reliability standards. Its 150 °C maximum junction temperature and halogen-free construction make SMB8J20CAHM3_A/H appropriate for engine control units, ADAS sensors, and infotainment system interfaces where environmental robustness is mandatory.
How does the HM3 suffix differ from E3 or HE3 in SMB8J20CAHM3_A/H?
The HM3 suffix in SMB8J20CAHM3_A/H indicates halogen-free, RoHS-compliant, and AEC-Q101 qualified construction, whereas E3 denotes RoHS-compliant commercial grade only, and HE3 adds AEC-Q101 qualification but not halogen-free status. HM3 also meets JESD201 Class 2 whisker resistance, critical for long-term solder joint integrity in automotive and industrial applications. SMB8J20CAHM3_A/H is therefore the only variant fully compliant with Tier 1 automotive material declarations and sustainability requirements.
What is the thermal resistance of SMB8J20CAHM3_A/H, and how does it affect layout design?
SMB8J20CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB with no internal copper planes. To maintain safe junction temperatures during repetitive surges, designers must adhere to the recommended pad layout and avoid excessive trace length or narrow traces between the device and copper pour. SMB8J20CAHM3_A/H's RθJL of 20 °C/W further emphasizes the importance of direct thermal connection to PCB copper.
Does SMB8J20CAHM3_A/H have polarity markings, and how is it installed?
No, SMB8J20CAHM3_A/H is a bidirectional TVS diode and carries no polarity marking-its package (SMB/DO-214AA) lacks a cathode band or other orientation indicator. It functions identically in either direction, making it ideal for AC-coupled lines, differential pairs, or floating signals where polarity cannot be guaranteed. During placement, SMB8J20CAHM3_A/H may be rotated 180° without affecting electrical performance, simplifying automated assembly and reducing orientation-related defects.
SMB8J20CAHM3_A/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:
- Obsolete
- 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_A/H FAQ
1.How can I place an order for SMB8J20CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J20CAHM3_A/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_A/H reliable?
The price and inventory of SMB8J20CAHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMB8J20CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J20CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J20CAHM3_A/H?
SMB8J20CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J20CAHM3_A/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_A/H?
For technical support, including SMB8J20CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J20CAHM3_A/H requirements.
6.How does Aetrix verify that SMB8J20CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMB8J20CAHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMB8J20CAHM3_A/H?
All SMB8J20CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J20CAHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMB8J20CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J20CAHM3_A/H Tags
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