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Vishay General Semiconductor - Diodes Division SMB8J12CAHM3_A/H
- Part No.:
- SMB8J12CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J12CAHM3_A/H.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J12CAHM3_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 12 V stand-off voltage (VWM), 19.9 V maximum clamping voltage (VC) at 40.2 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 supply rails.
For engineers reviewing the SMB8J12CAHM3_A/H datasheet, SMB8J12CAHM3_A/H pinout, SMB8J12CAHM3_A/H application, or SMB8J12CAHM3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, bidirectional polarity, low clamping ratio (VC/VWM = 1.66), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads per JEDEC standard.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown mechanism, with bidirectional symmetry enabling suppression of both positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<5 µA at VWM), while MSL Level 1 rating supports lead-free reflow up to 260 °C peak.
The SMB8J12CAHM3_A/H delivers consistent clamping performance across -55 °C to +150 °C junction temperature range, with thermal resistance RθJA = 72 °C/W and RθJL = 20 °C/W enabling effective heat dissipation in compact PCB layouts. Its 1.0 mA test current (IT) and 12 V stand-off align with IEC 61000-4-2/4-4/4-5 system-level immunity requirements for automotive electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 12 V nominal systems. |
| VBR min / max | 13.3 V / 14.7 V - Breakdown occurs within this range at 1.0 mA IT; ensures reliable triggering above system overvoltage thresholds. |
| VC @ IPPM | 19.9 V at 40.2 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to <20 V under 800 W transient. |
| PPPM | 800 W - Peak pulse power handling capability; supports robust protection against ISO 7637-2 Pulse 1/2a/5a surges in automotive environments. |
| ID @ VWM | <5 µA - Reverse leakage at stand-off voltage; minimizes quiescent power loss and avoids false triggering in high-impedance circuits. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive locations and industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive reliability including HTOL, temperature cycling, and ESD testing per AEC specification. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated terminals solderable per J-STD-002 and JESD 22-B102. Polarity: bidirectional - no marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Identical terminal behavior in both directions; connects across protected line and ground (or rail-to-rail); no orientation required during placement. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, HTOL, and ESD robustness - suitable for ADAS sensors and body control modules. |
| Low clamping ratio (VC/VWM = 1.66) | Minimizes voltage overshoot during surge events, protecting 12 V-rated microcontrollers and CAN transceivers without derating margins. |
| MSL Level 1, 260 °C peak | Enables single-pass lead-free reflow without moisture-related damage; eliminates baking requirement for production assembly. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets automotive environmental compliance standards (e.g., ELV, REACH) and supports green manufacturing initiatives. |
| Glass-passivated junction | Ensures stable VBR over lifetime and temperature, reducing parameter drift in harsh environments like engine compartments. |
Applications
| Automotive Sensor Protection | Industrial Power Supply Input |
|---|---|
Use Scenario: Protecting LIN bus and analog sensor outputs (e.g., pressure, temperature) from ESD and inductive switching noise in vehicle cabins. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and chassis ground to shunt transients before reaching MCU ADC or LIN transceiver input. Use Value: Maintains signal integrity under ±15 kV contact ESD (IEC 61000-4-2) and suppresses >800 W load dump spikes without latch-up or degradation. |
Use Scenario: Safeguarding 12 V DC input stage of PLC I/O modules exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Primary front-end TVS across input rails to absorb repetitive 10/1000 µs transients before upstream fuse or DC-DC converter. Use Value: Withstands 40.2 A peak surge current and 19.9 V clamping, preventing overvoltage shutdown of 24 V tolerant regulators and ensuring uptime in factory automation. |
| Automotive Body Control Unit | Telecom Interface Protection |
Use Scenario: Securing power distribution nodes in BCMs handling door lock actuators, window motors, and lighting drivers. IC Role / Device Role / Timing Role: Rail-to-rail bidirectional clamp on switched 12 V supply lines to suppress inductive kickback from solenoid loads per ISO 7637-2 Pulse 3b. Use Value: 800 W PPPM rating and AEC-Q101 qualification ensure long-term reliability in cyclic load-switching environments with ambient temperatures up to +105 °C. |
Use Scenario: Shielding RS-485 and CAN FD data lines in outdoor telecom cabinets from lightning-induced surges and ground potential differences. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed differential-mode across twisted-pair lines to limit common-mode transients without distorting signal edges. Use Value: Sub-100 pF junction capacitance (typ.) preserves signal integrity at 2 Mbps+ data rates while clamping to 19.9 V during 1 kV/500 A surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J12CAHE3_A/H | Same electrical specs, but RoHS-compliant commercial grade (non-halogen-free); no AEC-Q101 qualification. | Limited to non-automotive industrial or consumer applications where halogen content and automotive qualification are not mandated. | Select when cost sensitivity outweighs halogen-free or automotive certification requirements. |
| SMAJ12CA | Lower PPPM (400 W), higher VC (23.2 V), SMA package (smaller footprint, higher RθJA = 95 °C/W). | Suitable only for lower-energy transients; less robust thermal performance limits use in high-ambient or high-duty-cycle scenarios. | Choose only for space-constrained designs with verified <400 W surge exposure and ambient <85 °C. |
Compared with SMB8J12CAHE3_A/H, the SMB8J12CAHM3_A/H adds halogen-free construction and AEC-Q101 validation without sacrificing clamping performance; versus SMAJ12CA, it delivers double the surge power handling and superior thermal management in the same board area footprint.
Availability
SMB8J12CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial power supply input stages, and telecom interface hardening requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMB8J12CAHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMB8J12CAHM3_A/H belongs to Vishay's TRANSZORB® family of high-power TVS diodes engineered specifically for automotive and industrial surge immunity - delivering precise clamping, AEC-Q101 validation, and robust SMT packaging.
FAQ
What is the clamping voltage of SMB8J12CAHM3_A/H at its rated peak pulse current?
The SMB8J12CAHM3_A/H has a maximum clamping voltage (VC) of 19.9 V at 40.2 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry sees no more than 19.9 V during standardized surge events, making SMB8J12CAHM3_A/H suitable for protecting 12 V logic and analog interfaces without overvoltage damage.
Is SMB8J12CAHM3_A/H suitable for automotive applications?
Yes, SMB8J12CAHM3_A/H is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials (HM3 suffix). It meets automotive requirements for temperature cycling, high-temperature operating life, and ESD robustness, and is explicitly intended for use in body control modules, sensor units, and infotainment power supplies - confirmed in Vishay Document 88422 revision 09-Jan-2024.
What does the "HM3" suffix indicate in SMB8J12CAHM3_A/H?
The "HM3" suffix in SMB8J12CAHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from E3 (RoHS commercial), HE3 (RoHS + AEC-Q101), and M3 (halogen-free commercial) versions - confirming compliance with automotive environmental and reliability standards required for Tier 1 supply chains.
How does SMB8J12CAHM3_A/H differ from unidirectional TVS diodes like SMB10J12A?
SMB8J12CAHM3_A/H is bidirectional with symmetrical clamping for AC or dual-polarity transients, whereas SMB10J12A is unidirectional and conducts only in reverse bias. SMB8J12CAHM3_A/H offers 800 W PPPM and 40.2 A IPPM, while SMB10J12A provides 1000 W PPPM and 50.3 A IPPM - making SMB8J12CAHM3_A/H optimal for signal-line protection and SMB10J12A better suited for high-energy power-rail clamping.
What PCB pad layout is recommended for SMB8J12CAHM3_A/H to achieve rated power dissipation?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad per terminal for SMB8J12CAHM3_A/H to achieve full 800 W peak pulse power rating and thermal performance. Deviating from this layout reduces IPPM derating and increases junction temperature - refer to Figure 2 in Document 88422 for temperature-dependent derating curves applicable to SMB8J12CAHM3_A/H.
SMB8J12CAHM3_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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 40.2A
- 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)
SMB8J12CAHM3_A/H FAQ
1.How can I place an order for SMB8J12CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J12CAHM3_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 SMB8J12CAHM3_A/H reliable?
The price and inventory of SMB8J12CAHM3_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 SMB8J12CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMB8J12CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J12CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J12CAHM3_A/H?
SMB8J12CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J12CAHM3_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 SMB8J12CAHM3_A/H?
For technical support, including SMB8J12CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J12CAHM3_A/H requirements.
6.How does Aetrix verify that SMB8J12CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMB8J12CAHM3_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 SMB8J12CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMB8J12CAHM3_A/H?
All SMB8J12CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J12CAHM3_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 SMB8J12CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMB8J12CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J12CAHM3_A/H Tags
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