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Vishay General Semiconductor - Diodes Division SMB8J20CAHM3_A/I
- Part No.:
- SMB8J20CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J20CAHM3_A/I.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,750
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Product details
Overview
SMB8J20CAHM3_A/I 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 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_A/I datasheet, SMB8J20CAHM3_A/I pinout, SMB8J20CAHM3_A/I application, or SMB8J20CAHM3_A/I 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 an avalanche breakdown junction to limit reverse voltage across protected circuitry. Its bidirectional symmetry enables protection of AC-coupled or differential lines without polarity concerns, and its glass-passivated chip ensures stable breakdown characteristics under repeated surge stress.
The SMB8J20CAHM3_A/I delivers 800 W peak pulse power handling per 10/1000 µs waveform while maintaining <1.0 µA reverse leakage at 20 V (VWM), with thermal resistance RθJA = 72 °C/W enabling reliable operation up to +150 °C junction temperature in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before clamping begins; defines safe working range for 24 V nominal systems. |
| VBR min / max | 22.2 V / 24.5 V at 1 mA - verified breakdown threshold ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 32.4 V at 24.7 A - clamping voltage limits downstream IC stress during 800 W surge; clamping ratio = 1.62. |
| PPPM | 800 W (10/1000 µs) - energy-handling capacity suitable for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| ID @ VWM | ≤1.0 µA - ultra-low leakage preserves signal integrity and battery life in always-on sensor nodes. |
| TJ max | +150 °C - supports under-hood automotive environments and industrial enclosures without derating. |
| AEC-Q101 | Qualified - 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. Molding compound meets UL 94 V-0. Polarity: unmarked - bidirectional device with symmetrical terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction terminals | No polarity marking required; either terminal accepts positive or negative transients equally. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics including engine control modules and ADAS sensor interfaces. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes voltage overshoot during surge, protecting 3.3 V/5 V logic and analog front-ends behind level-shifting circuits. |
| MSL Level 1 (260 °C peak) | Enables standard lead-free reflow without moisture sensitivity concerns or baking requirements. |
| 800 W peak pulse power | Withstands multiple 10/1000 µs surges per IEC 61000-4-5, supporting long-term field reliability in industrial gateways. |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh environments. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector entry point to shunt surge energy before reaching PHY or ADC. Use Value: Prevents latch-up or permanent damage to transceivers rated for ≤36 V absolute maximum, enabled by 32.4 V clamping at 24.7 A. |
Use Scenario: Shielding digital input/output channels of programmable logic controllers against 2 kV/1 kA surges induced by motor contactor switching in factory automation. IC Role / Device Role / Timing Role: Primary surge suppression stage on field-side PCB traces, upstream of optocouplers or isolated drivers. Use Value: Maintains functional safety integrity by limiting transient voltage to <33 V, below the 36 V isolation barrier rating of common digital isolators. |
| Telecom Line Interface | Consumer USB Port Protection |
Use Scenario: Safeguarding Ethernet PHYs and PoE injectors from lightning-induced surges on outdoor telecom line cards. IC Role / Device Role / Timing Role: Secondary-level TVS on data pair lines, coordinated with gas discharge tubes (GDTs) for staged protection. Use Value: Provides fast-response clamping (<1 ns) after GDT fire-over, ensuring VC stays below 36 V to protect 100BASE-TX magnetics and PHY ESD structures. |
Use Scenario: Protecting USB 2.0 D+/D− lines in portable devices from ESD and cable discharge events during hot-plug. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed adjacent to USB connector to suppress ±15 kV contact ESD per IEC 61000-4-2. Use Value: Delivers sub-100 pF junction capacitance (typ.) and 32.4 V clamping, preserving signal integrity without degrading eye diagram margin. |
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/I | Same electrical specs; RoHS-compliant but not halogen-free; no AEC-Q101 qualification. | Suitable for commercial/industrial use only; not approved for automotive production. | Select when AEC-Q101 is not required and halogen-free material is not mandated by OEM spec. |
| SMAJ20CA | Lower PPPM (400 W), higher VC (34.0 V), SMA package (smaller footprint, higher RθJA). | Limited to lower-energy transients; less robust thermal performance in sustained surge conditions. | Choose only for space-constrained designs where 400 W surge margin suffices and automotive qualification is unnecessary. |
Compared with SMB8J20CAHE3_A/I, the SMB8J20CAHM3_A/I adds halogen-free construction and AEC-Q101 validation - critical for Tier 1 automotive supply chains. Against SMAJ20CA, it provides double the surge power rating and tighter clamping, enabling higher system-level EMC margin in demanding industrial and automotive deployments.
Availability
SMB8J20CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface boards requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMB8J20CAHM3_A/I 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 optimization.
The SMB8JxxCA series targets high-reliability transient suppression in automotive and industrial settings, engineered to meet AEC-Q101 and deliver consistent clamping performance across temperature and lifetime.
FAQ
What is the peak pulse power rating of SMB8J20CAHM3_A/I?
The SMB8J20CAHM3_A/I has a peak pulse power rating (PPPM) of 800 W under the standard 10/1000 µs waveform. This value is measured with the device mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, and reflects its ability to safely absorb transient energy without failure. The SMB8J20CAHM3_A/I maintains this rating up to +25 °C ambient, with derating applied above that temperature per Figure 2 in the Vishay datasheet 88422.
Is SMB8J20CAHM3_A/I suitable for automotive applications?
Yes, SMB8J20CAHM3_A/I is AEC-Q101 qualified and explicitly designated for automotive use via the HM3 suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and ESD, making it appropriate for engine control units, body electronics, and ADAS sensor interfaces where reliability under harsh conditions is mandatory. The SMB8J20CAHM3_A/I meets all requirements defined in the AEC-Q101 standard Rev. G.
What does the "HM3" suffix indicate in SMB8J20CAHM3_A/I?
The "HM3" suffix in SMB8J20CAHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Specifically, "H" identifies the AEC-Q101 grade, "M3" confirms halogen-free and RoHS compliance, and the "_A/I" indicates packaging in 13-inch tape-and-reel (I) with revision A. This distinguishes it from commercial-grade variants like HE3 (RoHS only) or E3/M3 (non-automotive). The SMB8J20CAHM3_A/I is certified to JESD201 Class 2 for whisker resistance and MSL Level 1 for moisture sensitivity.
How does SMB8J20CAHM3_A/I compare to unidirectional TVS diodes like SMB10J20A?
The SMB8J20CAHM3_A/I is bidirectional with symmetric clamping for AC or differential signal lines, whereas SMB10J20A is unidirectional and suited for DC-biased rails. SMB8J20CAHM3_A/I offers 800 W PPPM and 32.4 V clamping at 24.7 A, while SMB10J20A delivers 1000 W PPPM and 32.4 V clamping at 30.9 A - but only in one polarity. The SMB8J20CAHM3_A/I's bidirectional design eliminates polarity concerns in applications like RS-485 or CAN, though it trades 200 W peak power for that flexibility.
What is the maximum clamping voltage of SMB8J20CAHM3_A/I at its rated surge current?
The maximum clamping voltage (VC) of SMB8J20CAHM3_A/I is 32.4 V at its rated peak pulse current (IPPM) of 24.7 A, tested with a 10/1000 µs waveform. This value is guaranteed across the full operating temperature range (–55 °C to +150 °C) and represents the upper limit of voltage seen by downstream circuitry during worst-case surge events. The SMB8J20CAHM3_A/I achieves a clamping ratio (VC/VWM) of 1.62, which is critical for protecting 24 V systems with 36 V-rated components.
SMB8J20CAHM3_A/I 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/I FAQ
1.How can I place an order for SMB8J20CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J20CAHM3_A/I 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/I reliable?
The price and inventory of SMB8J20CAHM3_A/I 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/I is usually 5 days.
3.What payment methods are accepted for SMB8J20CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J20CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J20CAHM3_A/I?
SMB8J20CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J20CAHM3_A/I 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/I?
For technical support, including SMB8J20CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J20CAHM3_A/I requirements.
6.How does Aetrix verify that SMB8J20CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMB8J20CAHM3_A/I 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/I meets industry standards.
7.What is the process for return or replacement of SMB8J20CAHM3_A/I?
All SMB8J20CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J20CAHM3_A/I, 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/I part is unused and in its original packaging.
Return procedure for SMB8J20CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J20CAHM3_A/I Tags
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Diodes Incorporated
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