My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMB8J12CA-M3/52
;;2.jpg)
- Part No.:
- SMB8J12CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J12CA-M3/52.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,759
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMB8J12CA-M3/52 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 (10/1000 µs waveform), making it suitable for automotive sensor interface and industrial I/O line protection.
For engineers reviewing the SMB8J12CA-M3/52 datasheet, SMB8J12CA-M3/52 pinout, SMB8J12CA-M3/52 application, or SMB8J12CA-M3/52 equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification, halogen-free RoHS compliance (M3 suffix), and thermal resistance (RθJA = 72 °C/W) under standard PCB mounting conditions.
Technical Context
This device operates as a voltage-clamped crowbar during transients, with symmetrical breakdown (VBR min/max = 13.3 V / 14.7 V at 1 mA) enabling equal protection in both polarities. Its glass-passivated junction ensures stable leakage (<5 µA at VWM) and fast response (<1 ns), critical for safeguarding low-voltage logic interfaces against ESD and load-switching spikes.
Rated for -55 °C to +150 °C operating junction temperature and qualified to AEC-Q101, SMB8J12CA-M3/52 supports automotive-grade reliability without derating up to 85 °C ambient when mounted on 5.0 mm × 5.0 mm copper pads per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 12 V nominal systems. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - Confirmed bidirectional breakdown threshold; ensures symmetric overvoltage triggering in AC-coupled or floating lines. |
| VC @ IPPM | 19.9 V at 40.2 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to <20 V in 12 V rail applications. |
| PPPM | 800 W - Peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge immunity with margin. |
| IPPM | 40.2 A - Peak surge current capacity; enables protection of CAN, LIN, or RS-485 buses against 10/1000 µs transients. |
| TJ max | +150 °C - Maximum junction temperature; allows operation in under-hood automotive environments without thermal shutdown. |
| RθJA | 72 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs thermal design for sustained surge duty cycles. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (both ends) | Bidirectional surge path | Either terminal serves as anode or cathode depending on transient polarity; no color band or marking required. |
| Case (body) | Thermal and mechanical interface | Plastic body provides UL 94 V-0 flammability rating; copper pad layout (5.0 mm × 5.0 mm per terminal) required for rated power dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics including engine control units and ADAS sensor interfaces under temperature cycling, humidity, and mechanical shock stress. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets JESD201 Class 2 whisker resistance and global environmental regulations without compromising solderability or long-term reliability. |
| Low incremental surge resistance | Enables tighter clamping (VC − VWM = 7.9 V) versus competing 12 V TVS devices, reducing voltage overshoot on protected nodes. |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow assembly without moisture-induced delamination or parametric shift. |
| Glass-passivated junction | Ensures stable reverse leakage (<5 µA at VWM) across temperature and lifetime, critical for battery-powered sensor nodes. |
Applications
| Automotive Sensor Interface | Industrial I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) in engine compartments exposed to 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 input pins. Use Value: Limits clamped voltage to 19.9 V during 40.2 A surges, preserving integrity of 12 V-rated transceivers and avoiding latch-up in downstream microcontrollers. |
Use Scenario: Safeguarding PLC digital input modules connected to 24 V DC field wiring subject to inductive kickback from solenoids and contactors. IC Role / Device Role / Timing Role: Primary surge suppression element on each channel, mounted adjacent to terminal block to minimize inductance in fault path. Use Value: Withstands repeated 800 W surges while maintaining <5 µA leakage at 12 V, ensuring stable logic thresholds and low standby power consumption. |
| Consumer USB Port Protection | Telecom Line Interface |
|
Use Scenario: ESD and surge protection for USB 2.0 data lines (D+/D−) in portable medical devices requiring IEC 61000-4-2 Level 4 compliance. IC Role / Device Role / Timing Role: Low-capacitance TVS pair (one per line) placed between connector and USB transceiver to suppress ±15 kV contact discharge. Use Value: Fast <1 ns response and symmetrical clamping prevent data corruption during ESD events without adding jitter or signal attenuation. |
Use Scenario: Overvoltage protection on POTS line interfaces in VoIP gateways exposed to lightning-induced surges per ITU-T K.20/21. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), clamping residual transients to safe levels for SLIC and codec ICs. Use Value: 800 W power rating handles GDT follow-on current, while 19.9 V clamping prevents damage to 3.3 V or 5 V telecom ICs downstream. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA-M3/52 | Unidirectional variant (SMBJ series) with same VWM/VC but asymmetric conduction; lacks reverse-polarity surge capability. | Restricted to DC-biased lines where polarity is fixed (e.g., 12 V supply rails); unsuitable for AC or floating differential signals. | Select SMBJ12CA-M3/52 only when protecting unidirectional power rails with known polarity and no need for bidirectional clamping. |
| SMAJ12CA-M3/52 | Same electrical specs but in smaller SMA (DO-214AC) package; lower PPPM (400 W) and higher RθJA (110 °C/W). | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); not rated for IEC 61000-4-5 surge due to reduced power handling. | Choose SMAJ12CA-M3/52 for space-constrained consumer designs where full 800 W surge immunity is unnecessary. |
Compared with SMBJ12CA-M3/52 and SMAJ12CA-M3/52, SMB8J12CA-M3/52 uniquely delivers bidirectional 800 W surge protection in an SMB footprint with AEC-Q101 qualification-making it the only option among the three for automotive-grade, polarity-agnostic interface protection.
Availability
SMB8J12CA-M3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, consumer USB port protection, and telecom line interface circuits requiring stable component supply and long-term lifecycle support.
Supply support for SMB8J12CA-M3/52 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 optimization.
The SMB8J series is part of Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-power-density, AEC-Q101-compliant surge suppression in harsh automotive and industrial environments.
FAQ
What is the clamping voltage of SMB8J12CA-M3/52 at its rated peak pulse current?
The SMB8J12CA-M3/52 has a maximum clamping voltage (VC) of 19.9 V at its rated peak pulse current (IPPM) of 40.2 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 88422. The low VC ensures robust protection for 12 V systems without overstressing downstream ICs.
Is SMB8J12CA-M3/52 suitable for automotive applications?
Yes, SMB8J12CA-M3/52 is AEC-Q101 qualified and explicitly listed in Vishay's automotive ordering codes (HM3 suffix). It operates from -55 °C to +150 °C, meets MSL Level 1 reflow requirements, and is validated for mechanical shock, temperature cycling, and humidity testing per automotive standards. Its bidirectional clamping makes SMB8J12CA-M3/52 ideal for LIN, CAN FD, and sensor signal line protection in vehicles.
What does the "M3" suffix mean in SMB8J12CA-M3/52?
The "M3" suffix in SMB8J12CA-M3/52 indicates halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance and UL 94 V-0 flammability rating. Unlike "E3" variants, M3 parts eliminate brominated flame retardants while maintaining identical electrical performance, thermal characteristics, and solderability-ensuring environmental compliance without design trade-offs.
How does SMB8J12CA-M3/52 differ from SMBJ12CA-M3/52?
SMB8J12CA-M3/52 is bidirectional with symmetrical breakdown and clamping, whereas SMBJ12CA-M3/52 is unidirectional and conducts only in reverse bias. SMB8J12CA-M3/52 supports AC-coupled or floating signal lines (e.g., differential buses), while SMBJ12CA-M3/52 is limited to DC power rails. Both share the same SMB package and M3 environmental compliance, but their circuit roles are fundamentally distinct.
What PCB layout guidance applies to SMB8J12CA-M3/52 for optimal surge performance?
Vishay specifies mounting SMB8J12CA-M3/52 on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 800 W pulse power and 72 °C/W thermal resistance. Traces to the device must be short and wide to minimize inductance; placement within 2 mm of the protected connector is recommended. Thermal vias under pads improve heat dissipation in high-duty-cycle applications.
SMB8J12CA-M3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMB8J12CA-M3/52 FAQ
1.How can I place an order for SMB8J12CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J12CA-M3/52 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 SMB8J12CA-M3/52 reliable?
The price and inventory of SMB8J12CA-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J12CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J12CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J12CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J12CA-M3/52?
SMB8J12CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J12CA-M3/52 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 SMB8J12CA-M3/52?
For technical support, including SMB8J12CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J12CA-M3/52 requirements.
6.How does Aetrix verify that SMB8J12CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J12CA-M3/52 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 SMB8J12CA-M3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J12CA-M3/52?
All SMB8J12CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J12CA-M3/52, 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 SMB8J12CA-M3/52 part is unused and in its original packaging.
Return procedure for SMB8J12CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J12CA-M3/52 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 …
