My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMB8J12CAHM3/I
- Part No.:
- SMB8J12CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J12CAHM3/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,741
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMB8J12CAHM3/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 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 - suitable for automotive sensor interface and industrial I/O line protection.
For engineers reviewing the SMB8J12CAHM3/I datasheet, SMB8J12CAHM3/I pinout, SMB8J12CAHM3/I application, or SMB8J12CAHM3/I equivalent, this device delivers AEC-Q101-qualified transient suppression for bidirectional signal paths where low-leakage (<5 µA at VWM), fast response (<1 ns), and stable clamping under repetitive surges are critical design requirements.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified at 13.3–14.7 V (min/max) at 1 mA test current. Its junction capacitance is not explicitly listed in the datasheet but is typical of SMB-packaged TVS devices in this voltage class - optimized for signal integrity in data lines up to ~100 Mbps.
The device uses a glass-passivated silicon junction and meets MSL level 1 per J-STD-020 with 260 °C lead-free reflow peak. Thermal resistance is 72 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), enabling reliable operation up to +150 °C junction temperature under defined PCB pad layout (0.2" × 0.2" copper).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before significant leakage; defines safe working range for protected circuitry. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - ensures predictable avalanche initiation during transients without premature conduction. |
| VC @ IPPM | 19.9 V at 40.2 A - clamping voltage limits downstream voltage stress during 800 W surge events. |
| PPPM | 800 W (10/1000 µs) - energy-handling capability sufficient for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| ID @ VWM | ≤5 µA - ultra-low leakage preserves signal integrity and battery life in always-on sensor interfaces. |
| TJ max. | +150 °C - supports under-hood automotive environments and industrial enclosures without derating. |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with automated assembly; 0.220" × 0.130" body size. |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking - symmetrical terminals function identically for AC or differential signal protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Either terminal conducts during overvoltage in either direction; no cathode band - bidirectional operation requires no orientation during placement. |
| Case (exposed metal slug) | Thermal conduction path | Integral to thermal performance; soldered to PCB copper pad for junction-to-ambient thermal resistance of 72 °C/W. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment interfaces. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets automotive environmental standards and enables compliance with EU ELV and China RoHS directives. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without moisture sensitivity concerns or baking requirements. |
| Glass-passivated junction | Ensures long-term stability of breakdown characteristics and low parameter drift over temperature and lifetime. |
| Low incremental surge resistance | Enables tighter clamping (19.9 V at 40.2 A) versus competing SMB TVS devices, reducing voltage overshoot on protected ICs. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN, LIN, or analog sensor outputs (e.g., pressure, temperature) from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and microcontroller input. Use Value: Limits transient-induced latch-up or gate oxide damage to MCU GPIOs while maintaining <5 µA leakage at 12 V supply rails. |
Use Scenario: Shielding PLC digital input modules from inductive kickback when switching solenoids or relays. IC Role / Device Role / Timing Role: Parallel-connected TVS across input terminals to shunt surge energy before reaching optocoupler or level-shifter. Use Value: Withstands 800 W surges without degradation, preserving signal fidelity and enabling >100,000 surge cycles per IEC 61000-4-5. |
| USB 2.0 Data Line Protection | DC Power Rail Clamp |
|
Use Scenario: Safeguarding USB D+/D− lines against ESD (IEC 61000-4-2 ±15 kV contact) in automotive infotainment head units. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed directly at connector entry point. Use Value: Clamps to ≤19.9 V within nanoseconds, preventing damage to USB transceivers while adding negligible signal distortion. |
Use Scenario: Suppressing switching noise and load dump spikes on 12 V auxiliary power rails feeding camera modules or radar sensors. IC Role / Device Role / Timing Role: Primary overvoltage clamp across rail and ground, coordinated with upstream fuse and filter. Use Value: Maintains 12 V nominal operation with <5 µA standby leakage and clamps 800 W transients to safe levels for downstream DC/DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J12CAHE3/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Restricted to commercial-grade automotive subsystems (e.g., cabin electronics) where halogen-free is not mandated. | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 is not enforced by OEM tier-1 spec. |
| SMAJ12CA | Lower PPPM (400 W); same VWM/VBR/VC; SMA package (smaller footprint, higher RθJA = 110 °C/W). | Suitable only for lower-energy transients (e.g., IEC 61000-4-2 ESD only) and space-constrained layouts where thermal margin is less critical. | Choose for non-automotive consumer designs with limited board area and modest surge exposure. |
Compared with SMB8J12CAHE3/I, SMB8J12CAHM3/I adds halogen-free construction and AEC-Q101 validation for under-hood use; versus SMAJ12CA, it delivers double the surge power handling and superior thermal performance via larger SMB package and lower RθJA.
Availability
SMB8J12CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, USB 2.0 port protection, and 12 V DC power rail clamping requiring stable component supply across extended production lifecycles.
Supply support for SMB8J12CAHM3/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, automotive qualification, and high-power density packaging.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for robust, bidirectional transient suppression in harsh automotive and industrial environments where AEC-Q101 compliance and stable clamping under repeated surges are mandatory.
FAQ
What is the clamping voltage of SMB8J12CAHM3/I at its rated peak pulse current?
The SMB8J12CAHM3/I clamps to a maximum of 19.9 V when subjected to its rated peak pulse current of 40.2 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 and guarantees predictable overvoltage limiting for downstream components such as microcontrollers or transceivers connected to the protected line.
Is SMB8J12CAHM3/I suitable for automotive applications?
Yes - SMB8J12CAHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction. It is explicitly intended for automotive use cases including sensor interfaces, infotainment data lines, and power rail protection where reliability under temperature cycling, humidity, and mechanical vibration is required.
How does the SMB8J12CAHM3/I differ from unidirectional variants like SMB10J12A?
SMB8J12CAHM3/I is bidirectional with symmetrical breakdown and clamping behavior in both polarities, whereas SMB10J12A is unidirectional and features a cathode band marking. The "8" prefix denotes 800 W PPPM (vs. 1000 W for SMB10JxxA), and the "C" suffix confirms bidirectionality - making SMB8J12CAHM3/I appropriate for AC-coupled or differential signal lines.
What is the maximum operating temperature for SMB8J12CAHM3/I?
The SMB8J12CAHM3/I has a maximum junction temperature (TJ max.) of +150 °C, validated per its AEC-Q101 qualification. This allows deployment in under-hood automotive locations and industrial enclosures without thermal derating, provided the PCB mounting follows Vishay's recommended 0.2" × 0.2" copper pad layout for optimal heat dissipation.
Does SMB8J12CAHM3/I require orientation during PCB placement?
No - SMB8J12CAHM3/I is a bidirectional TVS diode with no polarity marking on the SMB (DO-214AA) package. Both terminals are functionally identical, eliminating orientation constraints during automated placement and simplifying layout verification for differential or AC signal paths.
SMB8J12CAHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for SMB8J12CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J12CAHM3/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 SMB8J12CAHM3/I reliable?
The price and inventory of SMB8J12CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J12CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMB8J12CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J12CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J12CAHM3/I?
SMB8J12CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J12CAHM3/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 SMB8J12CAHM3/I?
For technical support, including SMB8J12CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J12CAHM3/I requirements.
6.How does Aetrix verify that SMB8J12CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMB8J12CAHM3/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 SMB8J12CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMB8J12CAHM3/I?
All SMB8J12CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J12CAHM3/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 SMB8J12CAHM3/I part is unused and in its original packaging.
Return procedure for SMB8J12CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J12CAHM3/I Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
