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Taiwan Semiconductor Corporation SMBJ28CA
- Part No.:
- SMBJ28CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28CA.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,618
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Product details
Overview
SMBJ28CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 28 V working stand-off voltage (VWM), 31.1–38.0 V breakdown voltage (VBR), 50.0 V maximum clamping voltage (VC) at 12.6 A peak pulse current, and 600 W peak pulse power rating with sub-1 ps response time - deployed in automotive infotainment power inputs and industrial PLC I/O modules.
For engineers reviewing the SMBJ28CA datasheet, SMBJ28CA pinout, SMBJ28CA application, or SMBJ28CA equivalent, key selection criteria include bidirectional clamping capability, DO-214AA package compatibility with IPC-7351B footprint, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and leakage current ≤1 µA at 28 V - critical for low-power sensor interface protection and 24 V industrial bus designs.
Technical Context
The SMBJ28CA operates as a silicon avalanche diode with symmetrical bidirectional clamping behavior, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its glass-passivated junction ensures stable VBR tolerance and low leakage across -55°C to +150°C junction temperature range.
It delivers 600 W non-repetitive peak pulse power (10/1000 µs waveform) with 50.0 V clamping voltage at 12.6 A IPP, and exhibits 10 °C/W junction-to-case thermal resistance - supporting reliable operation under repeated surge stress when mounted on thermally adequate PCB copper areas.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous DC or RMS voltage the device blocks without conduction; defines safe operating margin below clamping threshold. |
| VBR min / max | 31.1 V / 38.0 V @ 1 mA - Verified avalanche onset range; ensures predictable turn-on during transients above system operating voltage. |
| VC @ IPP | 50.0 V @ 12.6 A - Clamped voltage seen by protected circuit during 10/1000 µs surge; limits downstream component stress to ≤50 V. |
| PPK | 600 W - Peak pulse power handling per single 10/1000 µs event; supports robust immunity against ISO 7637-2 Pulse 1 & 2b. |
| ID @ VWM | ≤1 µA - Reverse leakage at rated stand-off voltage; negligible loading on 24 V or 28 V supply rails in standby mode. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive or enclosed industrial enclosures without derating. |
| Package | DO-214AA (SMB) - Standardized surface-mount outline with 0.090 g mass and J-STD-002 solderable matte tin leads. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with cathode band marking; bidirectional symmetry means both terminals are functionally identical - no anode/cathode distinction required for SMBJ28CA operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Bidirectional Surge Terminal | Either terminal accepts transient energy from either polarity; connects to line or signal being protected. |
| Terminal 2 | Bidirectional Surge Terminal | Paired terminal completing low-impedance path to ground or return rail during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| Sub-1 ps response time | Enables suppression before sensitive ICs experience overvoltage - critical for USB 2.0, RS-485, and CAN FD data lines. |
| ISO 7637-2 compliance | Validated against automotive load dump and inductive switching pulses (Pulse 1, 2a, 2b, 3a, 3b), supporting AEC-Q200-aligned designs. |
| Glass-passivated junction | Ensures long-term VBR stability and low IR drift over temperature and lifetime - essential for field-deployed industrial equipment. |
| Moisture sensitivity level 1 | Per J-STD-020 - allows unlimited floor life before reflow; eliminates bake requirements and simplifies SMT assembly planning. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS directives - satisfies environmental compliance for global OEM shipments. |
Applications
| Automotive Power Input Protection | Industrial RS-485 Transceiver Protection |
|---|---|
Use Scenario: 12 V/24 V battery-fed infotainment head unit exposed to load dump and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and chassis ground to clamp transients before DC-DC converter input. Use Value: Limits voltage to ≤50 V during 10/1000 µs 100 V pulses, preventing damage to LDOs and microcontrollers rated for 36 V absolute max. |
Use Scenario: RS-485 node in factory automation network subject to EFT bursts and cable coupling noise. IC Role / Device Role / Timing Role: Paired SMBJ28CA devices (line-to-ground) on A/B differential pair protect transceiver I/O pins. Use Value: Sub-1 ps response captures fast EFT edges (5 ns rise), while 50 V clamping preserves ±7 V common-mode range of ISO3082-grade transceivers. |
| Smart Lighting Driver Protection | PLC Analog Input Module Protection |
Use Scenario: Constant-current LED driver in streetlight control cabinet subjected to lightning-induced surges on 24 V DC bus. IC Role / Device Role / Timing Role: SMBJ28CA installed across input terminals to shunt surge energy away from MOSFET gate drivers and current-sense amplifiers. Use Value: 600 W peak power rating handles multi-event surge stress per IEC 61000-4-5 Level 4 (4 kV), maintaining <1 µA leakage at 24 V nominal. |
Use Scenario: 4–20 mA analog input channel in modular PLC exposed to field wiring transients from solenoid switching. IC Role / Device Role / Timing Role: SMBJ28CA placed between signal line and local ground plane to limit overvoltage on precision op-amp front-end. Use Value: 31.1–38.0 V VBR ensures clamping initiates only above 20 mA loop's 28 V compliance voltage, avoiding false triggering during normal operation. |
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 SMAJ28CA | Same DO-214AC (SMA) package; 500 W PPK; VC = 45.4 V @ 12.3 A; slightly lower clamping but smaller thermal mass. | Lower power rating reduces margin for repetitive surges; SMA package has higher RθJA (70 °C/W vs 55 °C/W), limiting sustained duty cycle. | Select when board space is constrained and surge events are infrequent; verify thermal relief on PCB for >1 Hz repetition. |
| ON Semiconductor SMCJ28CA | DO-214AB (SMC) package; 1500 W PPK; VC = 48.4 V @ 31.0 A; larger footprint and higher surge capacity. | Higher clamping current capability suits 48 V telecom systems; SMC package requires larger pad layout and impacts density in compact modules. | Prefer for high-reliability 48 V industrial power supplies where 1500 W headroom and proven field history outweigh size penalty. |
Compared with SMBJ28CA, SMAJ28CA trades 100 W peak power and thermal performance for smaller size, while SMCJ28CA provides 2.5× surge margin at the cost of 2.5× board area - making SMBJ28CA the balanced choice for 24 V embedded systems requiring DO-214AA compatibility and ISO 7637-2 compliance.
Availability
SMBJ28CA is available at Aetrix Electronics and suitable for automotive infotainment power inputs, industrial RS-485 transceiver protection, and smart lighting driver circuits requiring stable component supply with full traceability and lifecycle management.
Supply support for SMBJ28CA 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs since 1979.
The SMBJ series was developed to deliver high-reliability, AEC-Q200-aligned transient protection in standard DO-214AA packaging - targeting cost-sensitive yet demanding automotive and industrial applications where clamping precision and thermal robustness are critical.
FAQ
What is the clamping voltage of SMBJ28CA and how is it measured?
The SMBJ28CA has a maximum clamping voltage (VC) of 50.0 V at 12.6 A peak pulse current (IPP), tested with a 10/1000 µs waveform per ANSI/IEEE C62.35. This value represents the upper voltage limit imposed on the protected circuit during a standardized surge event - directly verified in TSC's characterization lab using calibrated pulse generators and high-bandwidth oscilloscopes. The SMBJ28CA maintains this clamping performance across its full operating temperature range (-55°C to +150°C).
Is SMBJ28CA unidirectional or bidirectional, and how does that affect circuit placement?
SMBJ28CA is a bidirectional TVS diode, indicated by the "CA" suffix and confirmed by symmetric electrical characteristics in both polarities. Unlike unidirectional variants (e.g., SMBJ28A), it requires no orientation during placement - either terminal connects to the line being protected and the other to ground or return. This simplifies layout for AC-coupled interfaces like RS-485 or Ethernet PHYs, and eliminates risk of reverse installation in high-volume manufacturing of the SMBJ28CA.
Does SMBJ28CA meet automotive surge immunity standards?
Yes, SMBJ28CA meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupled EFT), and Pulse 3b (inductive coupled EFT). These validations are documented in Taiwan Semiconductor's official test reports for the SMBJ series, confirming its suitability for 12 V and 24 V automotive subsystems - including body control modules and ADAS sensor interfaces using the SMBJ28CA.
What is the leakage current specification for SMBJ28CA at its working voltage?
The SMBJ28CA specifies maximum blocking leakage current (ID) of ≤1 µA at its 28 V working stand-off voltage (VWM), measured at 25°C ambient. This ultra-low leakage ensures minimal power loss in always-on 24 V systems - such as telematics units or remote I/O nodes - and avoids false triggering of downstream undervoltage lockout circuits. The SMBJ28CA maintains ID < 5 µA up to 125°C per thermal derating curves in the datasheet.
Can SMBJ28CA be used in place of SMBJ28A in an existing design?
No - SMBJ28CA and SMBJ28A are not interchangeable without validation. SMBJ28A is unidirectional (anode-cathode asymmetry), while SMBJ28CA is bidirectional (symmetric clamping). Replacing SMBJ28A with SMBJ28CA on a DC rail may cause unintended conduction during reverse bias, and vice versa risks incomplete protection on AC or floating signals. Always verify polarity requirements and consult the SMBJ28CA datasheet before substitution.
SMBJ28CA 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:
- 2
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 13.3A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ28CA FAQ
1.How can I place an order for SMBJ28CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28CA 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 SMBJ28CA reliable?
The price and inventory of SMBJ28CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28CA is usually 5 days.
3.What payment methods are accepted for SMBJ28CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28CA?
SMBJ28CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28CA 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 SMBJ28CA?
For technical support, including SMBJ28CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28CA requirements.
6.How does Aetrix verify that SMBJ28CA is sourced from the original manufacturer or authorized distributors?
All SMBJ28CA 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 SMBJ28CA meets industry standards.
7.What is the process for return or replacement of SMBJ28CA?
All SMBJ28CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28CA, 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 SMBJ28CA part is unused and in its original packaging.
Return procedure for SMBJ28CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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