My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ12CD-M3/H
;;2.jpg)
- Part No.:
- SMBJ12CD-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12CD-M3/H.pdf
- Description:
- TVS DIODE 12VWM 19.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,314
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ12CD-M3/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 12 V stand-off voltage (VWM), 13.5–14.5 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), and clamps to ≤19.6 V at 30.6 A peak surge current - used to protect MOSFETs and sensor interfaces in industrial control systems.
For engineers reviewing the SMBJ12CD-M3/H datasheet, SMBJ12CD-M3/H pinout, SMBJ12CD-M3/H application, or SMBJ12CD-M3/H equivalent, key selection criteria include bidirectional clamping capability, ±3.5 % VBR tolerance, low leakage (<2.0 μA at VWM), MSL Level 1 moisture sensitivity, and halogen-free RoHS-compliant construction per JESD 201 Class 2 whisker test.
Technical Context
This device operates as a voltage-clamping protection element in both polarities, with symmetrical breakdown behavior due to its bidirectional structure. Its low incremental surge resistance and fast response time enable effective suppression of ESD, lightning-induced surges, and inductive switching transients without affecting normal signal integrity.
The SMBJ12CD-M3/H is rated for 150 °C maximum junction temperature and exhibits thermal resistance of 125 °C/W (junction-to-ambient, mounted on minimum pad layout). Its 1.0 W steady-state power dissipation at 25 °C ambient supports continuous operation in thermally constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum reverse stand-off voltage before significant conduction begins |
| VBR min/max | 13.5 V / 14.5 V at 1 mA - tight ±3.5 % tolerance ensures predictable turn-on across production lots |
| VC @ IPPM | ≤19.6 V at 30.6 A - clamping voltage under 10/1000 μs surge defines worst-case overvoltage seen by protected circuit |
| PPPM | 600 W - peak pulse power handling capacity per standard 10/1000 μs waveform |
| ID @ VWM | ≤2.0 μA - ultra-low reverse leakage preserves signal line integrity and minimizes standby power loss |
| Package | SMB (DO-214AA) - surface-mount outline with 2.20 mm × 3.94 mm footprint, optimized for automated placement |
Pinout & Package
Two-terminal device in SMB (DO-214AA) package; no polarity marking for bidirectional operation. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, with M3 suffix indicating halogen-free, RoHS-compliant, industrial-grade construction meeting JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; no cathode band - enables bidirectional clamping without orientation constraints |
| Case (body) | Thermal and mechanical interface | Plastic molded case meets UL 94 V-0 flammability rating; thermal resistance to ambient is 125 °C/W on minimal pad layout |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| ±3.5 % VBR tolerance | Reduces design margin requirements and improves consistency in multi-channel protection schemes |
| 600 W peak pulse power | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-earth) when properly laid out |
| MSL Level 1 rating | Allows unlimited floor life and reflow compatibility up to 260 °C peak without baking |
| Low leakage (≤2.0 μA) | Minimizes loading on high-impedance sensor outputs and battery-powered circuits |
Applications
| Industrial Sensor Interface Protection | RS-485/RS-422 Data Line Protection |
|---|---|
Use Scenario: Protecting analog voltage outputs and digital I/O pins of pressure, temperature, and flow sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Voltage clamping element placed between sensor output and microcontroller ADC input or GPIO line. Use Value: Limits transient overvoltage to ≤19.6 V during 30.6 A surges, preventing latch-up or permanent damage to downstream CMOS inputs. | Use Scenario: Safeguarding differential data lines in industrial communication nodes exposed to ground potential differences and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional TVS connected across A/B bus lines and referenced to signal ground. Use Value: Maintains signal integrity below 12 V operating range while clamping common-mode surges up to 600 W without adding capacitance that degrades 10 Mbps signaling. |
| DC Power Rail Protection (12 V) | MOSFET Gate Driver Protection |
Use Scenario: Secondary-level surge suppression on 12 V DC distribution rails feeding motor drivers and I/O expansion boards. IC Role / Device Role / Timing Role: Parallel-connected TVS shunting transients from upstream DC/DC converter or connector entry point. Use Value: Clamps induced spikes to ≤19.6 V within nanoseconds, preventing overvoltage stress on downstream regulators and load switches rated for 16 V max. | Use Scenario: Protecting gate-source terminals of N-channel power MOSFETs in half-bridge inverters subject to shoot-through and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional clamp placed directly across gate and source pins to limit VGS excursion. Use Value: Prevents gate oxide rupture by limiting VGS to ≤19.6 V during 30.6 A transient events, compatible with standard 12 V gate drive logic levels. |
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-E3/52 | Same VWM/VBR/PPPM specs; differs in packaging (tape-and-reel quantity, reel diameter) and JEDEC compliance labeling | No functional difference in circuit protection performance; identical thermal and electrical behavior | Select SMBJ12CA-E3/52 only if sourcing through authorized distributors requiring Vishay's standard E3/52 packaging code |
| P6SMB12CA | Same SMB package and bidirectional 12 V rating, but lower 600 W PPPM rating and higher typical clamping voltage (21.2 V vs. 19.6 V) | Marginally reduced clamping effectiveness may require additional design margin for sensitive 3.3 V logic interfaces | Choose P6SMB12CA only where legacy BOM alignment or distributor stock availability outweighs 1.6 V clamping advantage of SMBJ12CD-M3/H |
Compared with SMBJ12CA-E3/52, the SMBJ12CD-M3/H offers identical protection performance with M3-specific halogen-free and whisker-resistant plating; versus P6SMB12CA, it delivers tighter VBR tolerance and lower clamping voltage, enabling more robust protection in space-constrained industrial designs.
Availability
SMBJ12CD-M3/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, RS-485 communication lines, 12 V DC power rail protection, and MOSFET gate driver circuits requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ12CD-M3/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/industrial qualification.
The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments including factory automation, telecom infrastructure, and power conversion systems.
FAQ
What is the maximum clamping voltage of SMBJ12CD-M3/H under a 10/1000 μs surge?
The SMBJ12CD-M3/H has a maximum clamping voltage (VC) of 19.6 V when subjected to its rated peak pulse current of 30.6 A using the standardized 10/1000 μs waveform. This value is guaranteed per Vishay's datasheet Document Number 87606 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ12CD-M3/H maintains this clamping performance across its full operating temperature range.
Is SMBJ12CD-M3/H suitable for protecting 3.3 V logic interfaces?
No - the SMBJ12CD-M3/H is not recommended for direct protection of 3.3 V logic interfaces because its 12 V stand-off voltage (VWM) exceeds the absolute maximum rating of most 3.3 V ICs. Using SMBJ12CD-M3/H in such applications risks sustained forward conduction or failure to clamp before damage occurs. For 3.3 V systems, lower-voltage TVS devices such as SMBJ3.3CD-M3/H or SMAJ3.3A should be selected instead. The SMBJ12CD-M3/H is intended for 12 V nominal systems.
Does SMBJ12CD-M3/H have polarity markings on the package?
No, the SMBJ12CD-M3/H does not feature a cathode band or other polarity marking because it is a bidirectional TVS diode. Both terminals are functionally identical, allowing installation in either orientation on the PCB. This contrasts with unidirectional variants like SMBJ12D-M3/H, which include a cathode band. The absence of marking simplifies assembly and eliminates orientation-related errors in automated placement.
What is the thermal resistance of SMBJ12CD-M3/H when mounted on standard PCB pads?
The SMBJ12CD-M3/H has a typical junction-to-ambient thermal resistance (RθJA) of 125 °C/W when mounted on the minimum recommended copper pad layout per Vishay's datasheet. This value assumes a standard FR-4 board with specified pad dimensions and influences derating curves for continuous power dissipation. At 25 °C ambient, the device supports 1.0 W steady-state power; derating begins above that temperature per Figure 5 in Document Number 87606. The SMBJ12CD-M3/H also achieves 20 °C/W junction-to-mount thermal resistance.
How does the M3 suffix affect the reliability of SMBJ12CD-M3/H?
The M3 suffix on SMBJ12CD-M3/H indicates halogen-free, RoHS-compliant construction with matte tin-plated leads qualified to JESD 201 Class 2 for whisker resistance. This enhances long-term reliability in high-humidity or high-temperature environments by preventing tin whisker growth that could cause latent short circuits. The M3 designation also confirms compliance with material restrictions for industrial-grade applications, distinguishing it from non-M3 variants that may lack whisker testing or halogen-free certification. The SMBJ12CD-M3/H meets these requirements without trade-offs in electrical performance.
SMBJ12CD-M3/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.5V
- Voltage - Clamping (Max) @ Ipp:
- 19.6V
- Current - Peak Pulse (10/1000µs):
- 30.6A
- Power - Peak Pulse:
- 600W
- 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)
SMBJ12CD-M3/H FAQ
1.How can I place an order for SMBJ12CD-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12CD-M3/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 SMBJ12CD-M3/H reliable?
The price and inventory of SMBJ12CD-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ12CD-M3/H is usually 5 days.
3.What payment methods are accepted for SMBJ12CD-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12CD-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12CD-M3/H?
SMBJ12CD-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12CD-M3/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 SMBJ12CD-M3/H?
For technical support, including SMBJ12CD-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12CD-M3/H requirements.
6.How does Aetrix verify that SMBJ12CD-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ12CD-M3/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 SMBJ12CD-M3/H meets industry standards.
7.What is the process for return or replacement of SMBJ12CD-M3/H?
All SMBJ12CD-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12CD-M3/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 SMBJ12CD-M3/H part is unused and in its original packaging.
Return procedure for SMBJ12CD-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12CD-M3/H 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 …
