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Vishay General Semiconductor - Diodes Division SMB8J20CAHM3_B/H
- Part No.:
- SMB8J20CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J20CAHM3_B/H.pdf
- Description:
- 800W,20V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,346
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Product details
Overview
SMB8J20CAHM3_B/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 - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J20CAHM3_B/H datasheet, SMB8J20CAHM3_B/H pinout, SMB8J20CAHM3_B/H application, or SMB8J20CAHM3_B/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM = 1.62), and compatibility with automated SMT assembly on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its bidirectional symmetry enables protection of AC-coupled or differential lines without polarity constraints.
Rated for -55 °C to +150 °C junction temperature, it meets MSL Level 1 per J-STD-020 (260 °C peak reflow), supports 1.0 µA max reverse leakage at VWM, and delivers stable clamping performance under repetitive surge stress when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - defines maximum continuous operating voltage before clamping activation; sets system-level DC bias margin. |
| VBR (Breakdown Voltage) | 22.2–24.5 V at 1.0 mA - ensures reliable turn-on above normal operating range while avoiding false triggering. |
| VC (Clamping Voltage) | 32.4 V at IPPM = 24.7 A - limits downstream voltage stress during 10/1000 µs surge; clamping ratio = 1.62. |
| PPPM (Peak Pulse Power) | 800 W - sustains standardized lightning/surge immunity (IEC 61000-4-5) on bidirectional lines. |
| IPPM (Peak Pulse Current) | 24.7 A - quantifies maximum surge current handled at rated clamping voltage with 10/1000 µs waveform. |
| TJ max. | +150 °C - enables operation in under-hood automotive environments and high-ambient industrial enclosures. |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); polarity unmarked (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | No polarity marking required; terminals interchangeable for AC or differential line protection. |
| Case (body) | Thermal and mechanical interface | Plastic molding meets UL 94 V-0; thermal resistance RθJA = 72 °C/W on 5.0 mm × 5.0 mm pads. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control modules and ADAS sensor interfaces. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage exposure to protected ICs such as CAN transceivers or ADC front-ends. |
| MSL Level 1 rating | Enables single-pass reflow at 260 °C peak without moisture-induced failure. |
| Glass-passivated junction | Ensures stable breakdown characteristics and long-term reliability under thermal cycling. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets automotive environmental compliance requirements (e.g., ELV, IMDS). |
Applications
| Automotive Sensor Interface | Industrial Analog Input Module |
|---|---|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses. IC Role / Device Role: Bidirectional TVS placed between sensor output and microcontroller ADC input or LIN transceiver. Use Value: Clamps transients to ≤32.4 V while maintaining 20 V DC operating margin - prevents ADC saturation and transceiver latch-up. |
Use Scenario: Shielding 4–20 mA current loop inputs from EFT bursts and surge coupling in factory automation PLCs. IC Role / Device Role: Parallel-connected TVS across loop terminals to shunt induced energy before reaching precision op-amp conditioning stage. Use Value: 800 W PPPM rating handles repeated 1 kV/500 A surges per IEC 61000-4-5; low leakage (<1 µA) avoids loop current error. |
| Automotive Camera Link Protection | Consumer USB Type-C Port |
Use Scenario: Safeguarding MIPI CSI-2 differential pairs in rear-view or surround-view cameras exposed to battery transients. IC Role / Device Role: Bidirectional TVS on each data lane (CLK, DATA0–DATA3) referenced to common ground. Use Value: Symmetric clamping preserves signal integrity during ±20 V surges; SMB footprint allows dense placement near connectors. |
Use Scenario: Protecting USB Type-C CC and SBU pins from ESD and hot-swap voltage spikes in portable devices. IC Role / Device Role: Low-capacitance TVS (typ. <100 pF at 0 V) placed inline with CC logic lines. Use Value: 32.4 V clamping prevents damage to USB PD controllers; HM3 suffix ensures compliance with consumer RoHS/halogen bans. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J20CAHE3_B/H | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs HM3). | Lacks halogen-free certification required by some Tier 1 automotive OEMs. | Select HM3 for automotive programs mandating halogen-free materials; E3 acceptable for commercial industrial use. |
| SMAJ20CA | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W). | Insufficient for 800 W surge events; limited thermal dissipation in high-power layouts. | Use only where surge threat level is ≤400 W and board space is constrained; not drop-in for SMB8J20CAHM3_B/H. |
Compared with SMB8J20CAHE3_B/H and SMAJ20CA, SMB8J20CAHM3_B/H uniquely combines AEC-Q101 qualification, halogen-free construction, and 800 W bidirectional surge handling - making it the sole choice for automotive-grade 20 V line protection requiring full material compliance and thermal robustness.
Availability
SMB8J20CAHM3_B/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial analog input modules, camera link protection, and USB Type-C port hardening requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMB8J20CAHM3_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 and automotive qualification.
The SMB8JxxCA series targets high-reliability transient suppression in automotive and industrial systems, engineered to meet stringent AEC-Q101 and IEC 61000-4-5 requirements with optimized clamping performance and thermal design.
FAQ
What is the clamping voltage of SMB8J20CAHM3_B/H at its rated peak pulse current?
The SMB8J20CAHM3_B/H has a maximum clamping voltage (VC) of 32.4 V at its rated peak pulse current (IPPM) of 24.7 A, measured using the standard 10/1000 µs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and confirms effective overvoltage limiting for protected downstream circuitry in the SMB8J20CAHM3_B/H application context.
Is SMB8J20CAHM3_B/H suitable for automotive applications?
Yes, SMB8J20CAHM3_B/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction - meeting Tier 1 automotive requirements for under-hood and body-control module deployments. Its -55 °C to +150 °C operating range and validated surge robustness make SMB8J20CAHM3_B/H appropriate for engine management, ADAS sensors, and infotainment interfaces.
How does the SMB8J20CAHM3_B/H differ from unidirectional variants like SMB10J20A?
SMB8J20CAHM3_B/H is bidirectional with symmetrical clamping for AC or differential signals, while SMB10J20A is unidirectional and intended for DC-biased lines. SMB8J20CAHM3_B/H offers 800 W PPPM and 24.7 A IPPM, whereas SMB10J20A provides 1000 W PPPM and 30.9 A IPPM - reflecting different surge energy priorities. The "8" prefix denotes 800 W rating; "10" denotes 1000 W.
What is the thermal resistance of SMB8J20CAHM3_B/H under standard mounting conditions?
Under standard test conditions (mounted on 0.2" × 0.2" / 5.0 mm × 5.0 mm copper pads), SMB8J20CAHM3_B/H exhibits a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W. This value enables accurate thermal modeling for sustained surge duty cycles and validates safe operation up to +150 °C junction temperature when PCB layout adheres to Vishay's recommended pad dimensions.
Does SMB8J20CAHM3_B/H require polarity-aware PCB layout?
No - SMB8J20CAHM3_B/H is a bidirectional TVS diode with no cathode marking or polarity designation. Its symmetrical structure allows either terminal to serve as anode or cathode depending on transient polarity, simplifying layout for differential buses (e.g., CAN, LIN, MIPI) and eliminating orientation errors during automated placement. This feature is intrinsic to the SMB8J20CAHM3_B/H design and confirmed in Vishay's mechanical drawings.
SMB8J20CAHM3_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:
- 20V
- 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_B/H FAQ
1.How can I place an order for SMB8J20CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J20CAHM3_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 SMB8J20CAHM3_B/H reliable?
The price and inventory of SMB8J20CAHM3_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 SMB8J20CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMB8J20CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J20CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J20CAHM3_B/H?
SMB8J20CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J20CAHM3_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 SMB8J20CAHM3_B/H?
For technical support, including SMB8J20CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J20CAHM3_B/H requirements.
6.How does Aetrix verify that SMB8J20CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMB8J20CAHM3_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 SMB8J20CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMB8J20CAHM3_B/H?
All SMB8J20CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J20CAHM3_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 SMB8J20CAHM3_B/H part is unused and in its original packaging.
Return procedure for SMB8J20CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J20CAHM3_B/H Tags
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