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Taiwan Semiconductor Corporation SMBJ12C
- Part No.:
- SMBJ12C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12C.pdf
- Description:
- 600W, 14.8V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,546
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Product details
Overview
SMBJ12C from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 12V working stand-off voltage (VWM), and clamps transients to ≤22.0V at 28.0A peak current. It protects automotive and industrial DC power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ12C datasheet, SMBJ12C pinout, SMBJ12C application, or SMBJ12C equivalent, key selection criteria include clamping voltage (VC = 22.0V @ IPP = 28.0A), low leakage (<1µA @ VWM), fast response (<1.0ps), and compliance with automotive surge immunity standards.
Technical Context
The SMBJ12C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its breakdown range of 13.3–16.3V (VBR @ IT = 1mA). Its glass-passivated junction ensures stable breakdown and low leakage, while the DO-214AA package provides thermal resistance of RθJA = 55°C/W and RθJC = 10°C/W.
Designed for single-pulse transient suppression per 10/1000µs waveform, it handles non-repetitive peak impulse power up to 600W and steady-state power dissipation of 3W at 25°C ambient. Junction temperature is rated from –55°C to +150°C, supporting under-hood and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 13.3 / 16.3 V @ 1 mA - Confirmed breakdown threshold range for reliable turn-on margin |
| VC @ IPP | 22.0 V @ 28.0 A - Clamping voltage during 10/1000µs surge; limits downstream IC stress |
| PPK | 600 W - Peak pulse power handling per single 10/1000µs transient event |
| ID @ VWM | <1 µA - Ultra-low leakage ensures minimal standby power loss in battery-backed systems |
| TJ max | +150 °C - Enables operation in high-temperature automotive and industrial enclosures |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V rail); conducts during overvoltage to shunt energy to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling |
| Fast response time | <1.0 ps - Limits voltage overshoot before protection activates |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance stabilization) |
| Moisture sensitivity level | MSL Level 1 - No floor life limitation; suitable for standard SMT reflow without baking |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load-dump spikes (ISO 7637-2 Pulse 5a) on 12V vehicle battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12V rail and ground, clamping transients within 1.0ps to protect LDOs, CAN transceivers, and microcontrollers. Use Value: Limits rail voltage to ≤22.0V during 600W surges, preventing latch-up or gate oxide damage in downstream silicon. | Use Scenario: Shielding 4–20mA analog sensor inputs from ESD and EFT events in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Front-end TVS on signal lines, absorbing ±8kV contact ESD (IEC 61000-4-2) and 4kV burst noise (IEC 61000-4-4). Use Value: Maintains signal integrity with <1µA leakage at 12V, avoiding offset errors in precision current loops. |
| LED Driver Overvoltage Clamp | DC Motor Controller Flyback Suppression |
Use Scenario: Preventing catastrophic failure of constant-current LED drivers due to input capacitor discharge or hot-swap transients. IC Role / Device Role / Timing Role: Unidirectional clamp across driver input terminals, activated only during reverse overvoltage events. Use Value: Withstands 100A IFSM surge and clamps to 22.0V, enabling use with 24V nominal supplies while protecting 30V-rated FETs. | Use Scenario: Absorbing inductive kickback from brushed DC motors in robotics and HVAC actuators. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals or H-bridge outputs to divert flyback energy during PWM switching. Use Value: 600W PPK rating handles repetitive 10/1000µs flyback pulses without degradation, extending MOSFET lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA | Bidirectional version; symmetric VBR (13.3–16.3V) in both polarities; same VC = 22.0V @ 28.0A | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN FD bus); not suitable for DC rail clamping where polarity is fixed | Select SMBJ12CA only when bidirectional protection is needed; SMBJ12C offers lower cost and tighter leakage for unidirectional DC rails |
| SAC12 | Same VWM (12V), but lower PPK (400W); higher VC = 24.4V @ 22.0A; TO-220 package (not surface-mount) | Limited to lower-energy transients; through-hole mounting requires PCB real estate and assembly overhead | Choose SAC12 only if legacy through-hole design or higher thermal mass is required; SMBJ12C enables compact, automated SMT assembly with superior power density |
Compared with SMBJ12CA and SAC12, the SMBJ12C delivers optimal balance of 600W surge capacity, 22.0V clamping, and DO-214AA footprint for cost-sensitive, high-volume automotive and industrial DC power protection-without sacrificing MSL-1 manufacturability or ISO 7637-2 compliance.
Availability
SMBJ12C is available at Aetrix Electronics and suitable for automotive ECU power rail protection, industrial sensor interface hardening, and LED driver overvoltage clamping requiring stable component supply and full traceability.
Supply support for SMBJ12C 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMBJ series was designed specifically for robust, surface-mount transient suppression in harsh environments-emphasizing ISO 7637-2 compliance, low clamping voltage, and automated assembly readiness.
FAQ
What is the clamping voltage of SMBJ12C and how is it measured?
The SMBJ12C has a maximum clamping voltage (VC) of 22.0 V, measured at a peak impulse current (IPP) of 28.0 A using the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed across temperature and represents the upper limit of voltage seen by downstream circuitry during worst-case transients, ensuring compatibility with 24V-tolerant ICs.
Is SMBJ12C unidirectional or bidirectional, and how can I identify its polarity?
SMBJ12C is a unidirectional TVS diode. Polarity is indicated by a cathode band printed on the DO-214AA package body; the banded end connects to the protected line (e.g., 12V rail), while the unbanded end connects to ground. Bidirectional variants use the "CA" suffix (e.g., SMBJ12CA).
Does SMBJ12C meet automotive surge immunity standards?
Yes, SMBJ12C meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT/burst noise), making it suitable for 12V automotive power networks including body electronics, lighting modules, and infotainment power supplies.
What is the maximum leakage current of SMBJ12C at its working voltage?
The SMBJ12C exhibits a maximum blocking leakage current (ID) of less than 1 µA when biased at its 12 V working stand-off voltage (VWM), measured at 25°C ambient. This ultra-low leakage minimizes quiescent power loss in battery-powered or energy-sensitive systems.
Can SMBJ12C be used in automated SMT assembly processes?
Yes, SMBJ12C is optimized for automated placement: it uses the DO-214AA (SMB) package with matte tin-plated leads compliant with J-STD-002 solderability, has MSL Level 1 moisture sensitivity (no bake required), and supports standard reflow profiles-enabling high-yield, high-throughput manufacturing.
SMBJ12C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- 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:
- 22V
- Current - Peak Pulse (10/1000µs):
- 28A
- 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 (SMB)
SMBJ12C FAQ
1.How can I place an order for SMBJ12C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12C 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 SMBJ12C reliable?
The price and inventory of SMBJ12C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ12C is usually 5 days.
3.What payment methods are accepted for SMBJ12C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12C?
SMBJ12C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12C 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 SMBJ12C?
For technical support, including SMBJ12C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12C requirements.
6.How does Aetrix verify that SMBJ12C is sourced from the original manufacturer or authorized distributors?
All SMBJ12C 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 SMBJ12C meets industry standards.
7.What is the process for return or replacement of SMBJ12C?
All SMBJ12C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12C, 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 SMBJ12C part is unused and in its original packaging.
Return procedure for SMBJ12C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ12C Tags
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