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Taiwan Semiconductor Corporation SMBJ20C
- Part No.:
- SMBJ20C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20C.pdf
- Description:
- 600W, 24.7V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,358
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Product details
Overview
SMBJ20C from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode with a 20V working stand-off voltage, 35.8V maximum clamping voltage at 17.6A peak pulse current, and DO-214AA (SMB) package - designed for automotive load-dump and inductive switching surge protection in power supply rails and I/O interfaces.
For engineers reviewing the SMBJ20C datasheet, SMBJ20C pinout, SMBJ20C application, or SMBJ20C equivalent, key selection criteria include clamping performance under 10/1000µs transients, unidirectional polarity marking, junction temperature rating up to +150°C, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity requirements.
Technical Context
The SMBJ20C employs a glass-passivated silicon junction optimized for fast response (<1.0 ps) to ESD and electrical fast transients. Its unidirectional configuration provides low forward voltage (VF = 3.5 V @ 50 A) while maintaining <1 µA leakage above 10 V.
Thermal design is supported by RθJC = 10°C/W and RθJA = 55°C/W ratings, enabling reliable operation in ambient temperatures from –55°C to +150°C. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min / max | 22.2 V / 27.1 V - Breakdown occurs within this range at 1 mA test current |
| VC @ IPP | 35.8 V - Clamps transients to ≤35.8 V when subjected to 17.6 A 10/1000 µs pulse |
| PPK | 600 W - Peak pulse power handling capability per single non-repetitive event |
| IPP | 17.6 A - Maximum peak impulse current survivable under standard 10/1000 µs waveform |
| TJ max | +150°C - Maximum junction temperature defining thermal derating envelope |
| Package | DO-214AA (SMB) - Surface-mount outline with cathode band marking and 0.090 g mass |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band on one end. Leads are solderable per J-STD-002; moisture sensitivity level is J-STD-020 Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected circuit; conducts during forward surge events |
| Cathode | Clamping reference terminal | Marked with band; connected to higher-potential rail; initiates avalanche breakdown when VAK exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Clamping ratio (VC/VBR) | ≤1.61 - Ensures tight overvoltage control relative to breakdown threshold |
| Response time | <1.0 ps - Enables suppression of sub-nanosecond ESD events before IC damage occurs |
| Leakage current | <1 µA @ 20 V - Minimizes standby power loss in battery-powered systems |
| ISO 7637-2 compliance | Pulse 1/2a/2b/3a/3b - Validated for automotive electronics immunity testing per OEM requirements |
| RoHS & halogen-free | Compliant per IEC 61249-2-21 - Supports environmentally regulated industrial and automotive production |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges exceeding 20 V. Use Value: Limits voltage excursion to ≤35.8 V during 10/1000 µs pulses, preventing damage to downstream regulators and microcontrollers. |
Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) from EFT coupling in factory automation. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt fast transients before reaching signal conditioning circuitry. Use Value: Sub-1 ps response ensures clamping occurs before sensitive op-amps or ADCs experience overstress. |
| LED Driver Output Protection | RS-485 Transceiver Bus Line Protection |
Use Scenario: Shielding constant-current LED driver outputs from inductive kickback during switch-off. IC Role / Device Role / Timing Role: Unidirectional TVS across output terminals to absorb energy from inductive loads. Use Value: 600 W peak power rating handles repetitive switching surges without degradation under thermal derating. |
Use Scenario: Adding robustness to RS-485 bus lines exposed to lightning-induced surges in building control networks. IC Role / Device Role / Timing Role: Bidirectional-capable variant (SMBJ20CA) used across differential pair; SMBJ20C applied on single-ended bias lines. Use Value: 35.8 V clamping aligns with common 24 V RS-485 transceiver VCC rails, preserving signal integrity during transients. |
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 SMAJ20A | VC = 32.4 V @ 19.4 A; slightly tighter clamping but lower IPP margin | Same DO-214AC (SMA) footprint - requires PCB layout change | Select when lower clamping voltage is prioritized and board redesign is acceptable |
| ON Semiconductor SMCJ20A | VC = 32.4 V @ 19.4 A; identical electrical specs but DO-214AB (SMC) package | Larger SMC package increases board area use by ~40% vs. SMB | Choose for higher thermal mass needs where space permits |
Compared with SMBJ20C, SMAJ20A offers marginally better clamping but demands footprint revision, while SMCJ20A delivers identical protection with greater thermal capacity at the cost of increased PCB real estate - SMBJ20C balances compactness, performance, and automotive qualification.
Availability
SMBJ20C is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, LED driver outputs, and RS-485 communication systems requiring stable component supply across extended temperature ranges and high-reliability surge environments.
Supply support for SMBJ20C 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 industrial and automotive markets.
The SMBJ series was developed to deliver high-power, AEC-Q200–capable transient suppression in compact surface-mount packages for next-generation automotive and industrial control systems.
FAQ
What is the clamping voltage of SMBJ20C under a standard 10/1000 µs surge?
The SMBJ20C has a maximum clamping voltage (VC) of 35.8 V when subjected to a 17.6 A peak pulse current with a 10/1000 µs waveform. This value is guaranteed per the manufacturer's electrical specifications table and defines the upper voltage limit imposed on protected circuits during transient events. The SMBJ20C maintains this clamping performance across its full operating temperature range.
Is SMBJ20C unidirectional or bidirectional, and how is polarity marked?
SMBJ20C is a unidirectional TVS diode, with polarity indicated by a cathode band on the DO-214AA (SMB) package body. The cathode terminal connects to the higher-potential side of the circuit and initiates avalanche breakdown when reverse voltage exceeds the breakdown threshold. Bidirectional variants use the "CA" suffix (e.g., SMBJ20CA), which SMBJ20C does not carry.
Does SMBJ20C meet automotive transient immunity standards?
Yes, SMBJ20C meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for electrical disturbances in road vehicles. Its 600 W peak pulse power rating, fast response time (<1.0 ps), and specified clamping behavior under standardized waveforms make it suitable for protecting ECUs, body controllers, and lighting modules in automotive applications.
What is the maximum junction temperature rating for SMBJ20C?
The SMBJ20C has a maximum junction temperature (TJ) rating of +150°C, with storage temperature spanning –55°C to +150°C. This enables reliable operation in under-hood automotive environments and industrial enclosures where ambient temperatures exceed 100°C, provided thermal derating per Fig.2 in the datasheet is observed.
How does SMBJ20C compare to SMBJ20A in terms of breakdown voltage and clamping?
SMBJ20C has a VBR range of 22.2–27.1 V and VC = 35.8 V, whereas SMBJ20A specifies VBR = 22.2–24.5 V and VC = 32.4 V. The "A" suffix denotes tighter breakdown tolerance and lower clamping voltage, making SMBJ20A preferable where stricter voltage control is required - though both share identical package, power rating, and application scope.
SMBJ20C 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 17.6A
- 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 (SMB)
SMBJ20C FAQ
1.How can I place an order for SMBJ20C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20C 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 SMBJ20C reliable?
The price and inventory of SMBJ20C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20C is usually 5 days.
3.What payment methods are accepted for SMBJ20C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20C?
SMBJ20C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20C 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 SMBJ20C?
For technical support, including SMBJ20C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20C requirements.
6.How does Aetrix verify that SMBJ20C is sourced from the original manufacturer or authorized distributors?
All SMBJ20C 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 SMBJ20C meets industry standards.
7.What is the process for return or replacement of SMBJ20C?
All SMBJ20C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20C, 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 SMBJ20C part is unused and in its original packaging.
Return procedure for SMBJ20C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20C Tags
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