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Taiwan Semiconductor Corporation SMBJ15CH
- Part No.:
- SMBJ15CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ15CH.pdf
- Description:
- 600W, 18.6V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:8,499
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Product details
Overview
SMBJ15CH from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for automotive-grade ESD and surge protection. It features a 15 V working stand-off voltage (VWM), 16.7–20.4 V breakdown voltage (VBR), 23.1 A peak pulse current (IPP), 26.9 V maximum clamping voltage (VC), and 600 W peak pulse power (PPK). It is used to protect CAN bus interfaces, automotive lighting control modules, and microcontroller I/O lines against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ15CH datasheet, SMBJ15CH pinout, SMBJ15CH application, or SMBJ15CH equivalent, key selection criteria include its AEC-Q101 qualification, bidirectional capability (enabled by CH suffix), sub-1 ps response time, <1 µA leakage at 15 V, and compliance with automotive transient immunity standards-critical for robust 12 V/24 V system design.
Technical Context
The SMBJ15CH is a unidirectional TVS diode configured as a single die in a DO-214AA (SMB) surface-mount package, with cathode band marking. Its glass-passivated junction ensures stable breakdown behavior and low leakage under steady-state bias.
It operates across -55 °C to +150 °C junction temperature range, supports 10/1000 µs surge waveform compliance per ANSI/IEEE C62.35, and meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnect/switching), and Pulse 3a/3b (capacitive coupling) test profiles-making it suitable for automotive power line and signal line protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below system nominal 12 V supply with tolerance. |
| VBR @ IT=1 mA | 16.7–20.4 V - Measured breakdown range confirms reliable turn-on during fast transients without premature conduction. |
| VC @ IPP=23.1 A | 26.9 V - Clamping voltage limits downstream IC stress during 600 W surge; stays well below typical 33 V rail absolute max ratings. |
| IPP | 23.1 A - Peak surge current capacity for 10/1000 µs waveform; sufficient for ISO 7637-2 Pulse 1 (−100 V/2 Ω) on 12 V systems. |
| PPK | 600 W - Non-repetitive peak pulse power rating defines transient energy absorption capability per standardized surge event. |
| ID @ VWM | <1 µA - Ultra-low blocking leakage ensures minimal standby power loss and no interference with high-impedance sensor or CAN bus signals. |
| TJ max | +150 °C - Junction temperature rating enables operation in under-hood automotive environments without derating. |
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; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-voltage return path; forms clamping path when cathode is biased above VBR. |
| Cathode | Protected line input | Connected to signal/power line being protected; conducts surge current to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and infotainment systems per stress test requirements. |
| Glass passivated junction | Ensures consistent VBR tolerance, low leakage drift over temperature, and long-term reliability in humid or thermally cycled environments. |
| Fast response time <1.0 ps | Clamps ESD and fast transients before sensitive CMOS inputs can be damaged-critical for protecting CAN FD or LIN transceivers. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Guarantees functional immunity to real-world automotive electrical disturbances without external circuit redesign. |
| RoHS and halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally compliant manufacturing and end-of-life handling. |
Applications
| Automotive Lighting Control | CAN Bus Physical Layer Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontrollers in headlamp/tail lamp modules from load dump and inductive switching spikes. IC Role / Device Role / Timing Role: TVS clamping element placed between power rail and ground, absorbing >600 W surges within nanoseconds. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V logic supplies while maintaining <1 µA quiescent leakage during normal operation. | Use Scenario: Safeguarding CAN transceiver pins (CAN_H/CAN_L) against ESD and coupled transients in vehicle networking nodes. IC Role / Device Role / Timing Role: Bidirectional clamping device (enabled by CH suffix) placed across differential pair to limit common-mode overvoltage. Use Value: Maintains signal integrity up to 5 Mbps CAN FD rates by limiting clamping voltage to 26.9 V without adding parasitic capacitance (>100 pF). |
| Industrial Sensor Interface | 12 V Power Rail Surge Suppression |
Use Scenario: Shielding analog front-end amplifiers and ADC inputs in automotive pressure/temperature sensors from board-level ESD. IC Role / Device Role / Timing Role: Low-leakage unidirectional TVS connected between sensor output line and ground to shunt fast transients. Use Value: Enables sub-µA bias current accuracy in precision sensor signal chains without introducing offset or noise from leakage current. | Use Scenario: Protecting DC-DC converter inputs and MCU power rails in telematics units exposed to battery disconnection events. IC Role / Device Role / Timing Role: Primary surge suppression device on 12 V main input, clamping ISO 7637-2 Pulse 1 (−100 V/2 Ω) to ≤26.9 V. Use Value: Eliminates need for secondary TVS stages or oversized input capacitors-reducing BOM count and PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ15CA | Bidirectional variant with same VWM/VC, but higher IPP (24.7 A) and slightly higher VC (27.7 V); identical DO-214AC (SMA) footprint. | Same ISO 7637-2 coverage but lower thermal resistance (RθJA = 50 °C/W vs. 55 °C/W) enables tighter layout spacing in dense modules. | Select SMAJ15CA if board space allows SMA package and higher surge margin is required; not drop-in due to different package outline. |
| Vishay SMA6J15CA | Identical electrical specs (VWM = 15 V, VC = 26.9 V, PPK = 600 W), AEC-Q101 qualified, DO-214AC (SMA) package with RθJA = 52 °C/W. | Approved for use in ASIL-B systems per Vishay documentation; includes extended lifetime testing data for 15-year automotive deployments. | Prefer SMA6J15CA for safety-critical ADAS modules where documented reliability history is mandatory; requires footprint adaptation. |
Compared with SMBJ15CH, SMAJ15CA offers marginally higher surge current handling in a smaller SMA package, while SMA6J15CA provides certified ASIL-B readiness-both require PCB layout revision but deliver equivalent clamping performance for 12 V automotive power and signal lines.
Availability
SMBJ15CH is available at Aetrix Electronics and suitable for automotive lighting control, CAN bus protection, and industrial sensor interface applications requiring stable component supply across extended temperature ranges and rigorous transient immunity.
Supply support for SMBJ15CH 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, and rectifiers with global automotive and industrial certifications.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in 12 V/24 V automotive subsystems-including body control, lighting, and communication networks-balancing high surge capability with low leakage and compact SMB packaging.
FAQ
What does the 'CH' suffix indicate in SMBJ15CH?
The 'CH' suffix in SMBJ15CH denotes a bidirectional configuration, meaning the device functions identically in both forward and reverse bias directions. This enables symmetric clamping across differential lines like CAN_H/CAN_L without polarity concerns. Unlike unidirectional SMBJ15H, SMBJ15CH has identical VBR and VC specifications in both directions, confirmed in TSC's datasheet Section "Devices for Bipolar Applications".
Is SMBJ15CH AEC-Q101 qualified?
Yes, SMBJ15CH is explicitly AEC-Q101 qualified as stated in the "FEATURES" section of the official Taiwan Semiconductor datasheet (Version A2102). This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD-validating its suitability for automotive under-hood and cabin applications where reliability is critical.
What is the maximum clamping voltage of SMBJ15CH at rated surge current?
The maximum clamping voltage (VC) of SMBJ15CH is 26.9 V at IPP = 23.1 A with a 10/1000 µs waveform, per the "ELECTRICAL SPECIFICATIONS" table on page 2 of the datasheet. This value ensures protected ICs see less than 27 V during worst-case transients, staying safely below typical 33 V absolute maximum ratings of automotive-grade microcontrollers and transceivers.
Does SMBJ15CH meet ISO 7637-2 Pulse 1 requirements?
Yes, SMBJ15CH meets ISO 7637-2 Pulse 1 (inductive load dump) requirements as explicitly listed in the "FEATURES" section. With its 600 W peak pulse power rating and 26.9 V clamping voltage, it limits the voltage seen by downstream circuitry to safe levels during the −100 V/2 Ω transient event-verified through standardized testing per the specification.
What is the junction-to-ambient thermal resistance (RθJA) of SMBJ15CH?
The junction-to-ambient thermal resistance (RθJA) of SMBJ15CH is 55 °C/W, as specified in the "THERMAL PERFORMANCE" table on page 2 of the Taiwan Semiconductor datasheet. This value assumes standard JEDEC 2-layer board conditions and informs thermal design margins when estimating temperature rise under sustained power dissipation or repeated surge events.
SMBJ15CH 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 26.9V
- Current - Peak Pulse (10/1000µs):
- 23.1A
- 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)
SMBJ15CH FAQ
1.How can I place an order for SMBJ15CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ15CH 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 SMBJ15CH reliable?
The price and inventory of SMBJ15CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ15CH is usually 5 days.
3.What payment methods are accepted for SMBJ15CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ15CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ15CH?
SMBJ15CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ15CH 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 SMBJ15CH?
For technical support, including SMBJ15CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ15CH requirements.
6.How does Aetrix verify that SMBJ15CH is sourced from the original manufacturer or authorized distributors?
All SMBJ15CH 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 SMBJ15CH meets industry standards.
7.What is the process for return or replacement of SMBJ15CH?
All SMBJ15CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ15CH, 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 SMBJ15CH part is unused and in its original packaging.
Return procedure for SMBJ15CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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