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Taiwan Semiconductor Corporation SMBJ12CAH
- Part No.:
- SMBJ12CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ12CAH.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,561
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Product details
Overview
SMBJ12CAH from Taiwan Semiconductor is a bidirectional transient voltage suppressor diode (TVS) designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 12V working stand-off voltage (VWM), 19.9V maximum clamping voltage (VC) at 31A peak pulse current, and 600W peak pulse power rating with DO-214AA (SMB) surface-mount package. It is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and switching transient immunity.
For engineers reviewing the SMBJ12CAH datasheet, SMBJ12CAH pinout, SMBJ12CAH application, or SMBJ12CAH equivalent, key selection criteria include bidirectional clamping performance at 12V rail level, sub-1ps response time, <1µA leakage above VWM, compliance with automotive transients, and compatibility with automated SMT assembly on DO-214AA footprint.
Technical Context
The SMBJ12CAH operates as a silicon avalanche diode with glass-passivated junction, enabling fast response (<1.0ps) to ESD and lightning-induced surges. Its bidirectional configuration provides symmetrical clamping in both polarities without external polarity management, making it suitable for AC-coupled or floating signal lines and unidirectional DC rails requiring reverse-polarity fault tolerance.
Thermally, it delivers 10°C/W junction-to-case and 55°C/W junction-to-ambient resistance, supporting continuous operation up to +150°C junction temperature. It sustains 100A non-repetitive forward surge (8.3ms half-sine) and maintains <1µA blocking leakage at 12V, ensuring minimal standby power impact in always-on systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR (min/max) | 13.3 / 14.7 V - Breakdown occurs within this range at 1 mA test current; ensures reliable triggering above normal operating voltage |
| VC @ IPP | 19.9 V at 31 A - Clamped voltage during 10/1000µs surge; limits downstream IC stress to safe levels |
| PPK | 600 W - Peak pulse power handling per 10/1000µs waveform; supports ISO 7637-2 Pulse 1/2/3 compliance |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery life and avoids false triggers in high-impedance sensing circuits |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments and industrial enclosures without derating |
| Package | DO-214AA (SMB) - Standardized 2-pin SMT footprint compatible with IPC-7351B land patterns and reflow profiles |
Pinout & Package
DO-214AA (SMB) package: surface-mount, molded plastic case with matte tin-plated leads, polarity indicated by cathode band (bidirectional operation means band denotes common reference point, not unidirectional anode/cathode).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (marked side) | Transient return path (bidirectional) | Functions as cathode during positive transients and anode during negative transients; no fixed polarity |
| Cathode (band side) | Transient return path (bidirectional) | Same electrical role as Anode pin; symmetric terminals enable placement without orientation check in layout |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per stress test conditions |
| Glass-passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives; critical for under-hood longevity |
| ISO 7637-2 compliance | Guarantees survivability against real-world automotive transients: load dump (Pulse 2b), inductive switch-off (Pulse 1), and coupling noise (Pulse 3a/b) |
| Moisture sensitivity level 1 | Zero bake requirement before reflow; supports standard SMT line handling without dry-pack or MSL mitigation steps |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS directives; enables compliance in green electronics programs and export markets |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12V battery-fed ECUs exposed to load dump and alternator ripple in passenger vehicles and commercial trucks. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of LDOs, CAN transceivers, and microcontrollers to limit transient overvoltage. Use Value: Limits clamped voltage to 19.9V during 31A surge, protecting 24V-tolerant ICs while maintaining AEC-Q101 qualification for zero field failures. | Use Scenario: 4–20mA loop-powered pressure/temperature sensors in factory automation cabinets subject to EFT bursts and ground bounce. IC Role / Device Role / Timing Role: Bidirectional shunt protector across sensor supply and return lines to absorb ±2kV EFT (IEC 61000-4-4) without polarity constraints. Use Value: Sub-1ps response and <1µA leakage preserve analog accuracy and prevent false triggering in precision measurement front-ends. |
| LED Lighting Driver Protection | USB-C Port ESD Hardening |
Use Scenario: Constant-current LED drivers in streetlight and automotive headlamp modules subjected to inductive kickback from MOSFET switching. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to clamp flyback spikes before they reach LED strings or controller ICs. Use Value: 600W peak power rating absorbs repetitive 10/1000µs surges without degradation; DO-214AA footprint allows compact placement near switching node. | Use Scenario: USB-C receptacles in portable medical devices where ESD events exceed ±15kV contact discharge per IEC 61000-4-2. IC Role / Device Role / Timing Role: Bidirectional TVS on VBUS and CC lines to clamp ESD before reaching USB PD controller and port manager. Use Value: Symmetrical clamping ensures equal protection for VBUS (5–20V) and CC (3.3V logic) without separate unidirectional devices or polarity awareness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ12CA | Same DO-214AC (SMA) package; 20.9V VC @ 29.1A; slightly higher clamping voltage and lower IPP than SMBJ12CAH | Lower peak power (400W) limits suitability for ISO 7637-2 Pulse 2b load dump; better for cost-sensitive consumer designs | Select SMAJ12CA only if board space allows SMA footprint and application does not require full 600W surge margin. |
| ON Semiconductor 1.5SMC12CA | DO-214AB (SMC) package; 20.1V VC @ 29.7A; 1500W rating but larger footprint and higher thermal mass | Higher power rating suits heavy-duty industrial motor drives, but SMC size may conflict with dense automotive PCB layouts | Choose 1.5SMC12CA when system-level surge testing exceeds 600W or when thermal dissipation >10°C/W is required. |
Compared with SMAJ12CA and 1.5SMC12CA, SMBJ12CAH uniquely balances 600W surge capability, DO-214AA compactness, AEC-Q101 qualification, and ISO 7637-2 compliance-making it optimal for space-constrained automotive modules where full load-dump immunity is mandatory.
Availability
SMBJ12CAH is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and LED driver surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMBJ12CAH 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 automotive-qualified components since 1979.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive subsystems and industrial equipment exposed to ISO 7637-2 and IEC 61000-4-x threats.
FAQ
What is the clamping voltage of SMBJ12CAH under a 10/1000µs surge?
The SMBJ12CAH clamps to a maximum of 19.9 V when subjected to a 31 A peak impulse current with a 10/1000µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees predictable overvoltage limiting for downstream 24V-tolerant ICs. The SMBJ12CAH datasheet specifies this as VC@IPP, confirmed across production lots and temperature ranges from −55°C to +150°C.
Is SMBJ12CAH suitable for bidirectional signal line protection?
Yes, SMBJ12CAH is explicitly designed for bidirectional operation, as indicated by the "CAH" suffix and verified in its electrical specifications: breakdown voltage (VBR) and clamping voltage (VC) apply identically in both directions. It requires no external polarity management and is commonly deployed across differential buses like RS-485, CAN FD, and USB-C CC lines where polarity reversal or AC coupling exists.
Does SMBJ12CAH meet automotive qualification standards?
Yes, SMBJ12CAH is AEC-Q101 qualified and tested per ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a/2b (load dump), and Pulse 3a/3b (capacitive coupling). Its DO-214AA package also passes JESD201 Class 2 whisker testing and moisture sensitivity level 1 (MSL-1), eliminating bake requirements prior to reflow soldering in automotive manufacturing lines.
What is the maximum leakage current of SMBJ12CAH at its working voltage?
At its 12 V working stand-off voltage (VWM), SMBJ12CAH exhibits a maximum blocking leakage current (ID) of 1 µA at 25°C - verified per the manufacturer's electrical specifications table. This ultra-low leakage ensures negligible power loss in battery-backed systems and prevents false triggering in high-impedance monitoring circuits, such as those found in automotive wake-up detection or IoT sensor nodes.
Can SMBJ12CAH replace SMBJ12A in existing designs?
No - SMBJ12CAH is bidirectional, whereas SMBJ12A is unidirectional. Replacing SMBJ12A with SMBJ12CAH introduces symmetrical clamping behavior that may interfere with DC biasing or forward-conduction paths in legacy circuits. The SMBJ12CAH pinout appears identical physically, but its internal structure and IV curve differ fundamentally; design validation is required before substitution.
SMBJ12CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- 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):
- 31A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ12CAH FAQ
1.How can I place an order for SMBJ12CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ12CAH 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 SMBJ12CAH reliable?
The price and inventory of SMBJ12CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ12CAH is usually 5 days.
3.What payment methods are accepted for SMBJ12CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ12CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ12CAH?
SMBJ12CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ12CAH 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 SMBJ12CAH?
For technical support, including SMBJ12CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ12CAH requirements.
6.How does Aetrix verify that SMBJ12CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ12CAH 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 SMBJ12CAH meets industry standards.
7.What is the process for return or replacement of SMBJ12CAH?
All SMBJ12CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ12CAH, 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 SMBJ12CAH part is unused and in its original packaging.
Return procedure for SMBJ12CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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