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Taiwan Semiconductor Corporation SMBJ28AH
- Part No.:
- SMBJ28AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28AH.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,206
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Product details
Overview
SMBJ28AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade ESD and surge protection in power rails and signal lines. It features a 28 V working stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR), 45.4 V maximum clamping voltage (VC) at 13.8 A peak pulse current, and 600 W peak pulse power rating per 10/1000 µs waveform - suitable for ISO 7637-2 Pulse 1/2a/2b/3a/3b-compliant automotive electronics.
For engineers reviewing the SMBJ28AH datasheet, SMBJ28AH pinout, SMBJ28AH application, or SMBJ28AH equivalent, key selection criteria include clamping performance under 13.8 A surge, leakage current ≤1 µA at 28 V, AEC-Q101 qualification, DO-214AA (SMB) package compatibility, and unidirectional polarity marking for DC rail protection.
Technical Context
The SMBJ28AH operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast response (<1.0 ps) to transients while maintaining low leakage (<1 µA at VWM). Its thermal design supports TJ up to +150°C, with RθJA = 55°C/W and RθJC = 10°C/W, ensuring robust operation in under-hood automotive environments.
It complies with ISO 7637-2 for automotive load-dump and switching transient immunity, and meets JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1 - confirming suitability for lead-free reflow and high-reliability automated assembly without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min/max | 31.1 V / 34.4 V @ 1 mA - Confirmed avalanche onset range ensuring predictable turn-on during overvoltage |
| VC @ IPP | 45.4 V @ 13.8 A - Clamped voltage during 10/1000 µs surge, limiting downstream IC stress |
| PPK | 600 W - Peak pulse power handling capability per standard 10/1000 µs waveform |
| ID @ VWM | <1 µA - Ultra-low leakage preserves system efficiency in always-on circuits |
| TJ max | +150 °C - Enables deployment in engine control units and other high-temperature automotive zones |
| Package | DO-214AA (SMB) - Standardized 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 unidirectional devices. Leads are solderable per J-STD-002; weight ≈ 0.090 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; forms current sink during clamping |
| Cathode | High-side connection point | Connected to protected line (e.g., 24 V rail); marked by band; conducts when line exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, humidity bias, and mechanical shock per stress test requirements |
| Glass passivated junction | Enhances long-term reliability and stability of VBR under thermal and electrical stress vs. non-passivated alternatives |
| Clamping voltage ≤45.4 V @ 13.8 A | Provides defined overvoltage ceiling for 24 V systems, protecting downstream CAN transceivers and microcontrollers |
| Response time <1.0 ps | Ensures suppression before ESD or fast transients propagate into sensitive analog or digital circuitry |
| Moisture sensitivity level 1 | Permits use without baking prior to reflow, reducing manufacturing cost and process complexity |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply lines in body control modules against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and LDO input to clamp surges before regulation. Use Value: Limits voltage to ≤45.4 V during 13.8 A transients, preventing damage to 36 V-rated regulators and MCU power domains. | Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA loops) in industrial PLC I/O modules from EFT and cable discharge events. IC Role / Device Role / Timing Role: TVS connected across output terminals to shunt fast transients before they reach op-amp drivers. Use Value: Sub-1 ps response ensures clamping occurs before transient energy couples into precision current-sense circuitry. |
| LED Lighting Driver Protection | Automotive CAN Bus Node Protection |
Use Scenario: Shielding constant-current LED drivers in headlamp assemblies from reverse-battery and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS on input side of buck controller to absorb 600 W pulses without degradation. Use Value: Withstands repeated 10/1000 µs surges up to 600 W while maintaining <1 µA leakage at 28 V standby. | Use Scenario: Front-end protection for CAN FD transceivers in gateway ECUs exposed to board-level ESD and coupled noise. IC Role / Device Role / Timing Role: TVS placed on CAN_H/CAN_L lines (with appropriate common-mode filtering) to limit differential overvoltage. Use Value: Low clamping voltage (45.4 V) avoids violating CAN transceiver absolute maximum ratings during ISO 7637-2 Pulse 2b events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A | VBR min/max = 31.1–35.5 V; VC = 47.0 V @ 13.0 A; no AEC-Q101 qualification | Not rated for automotive use; suitable for industrial/commercial PCBs without automotive compliance needs | Select SMBJ28A only if AEC-Q101 is not required and higher clamping voltage is acceptable |
| SAC28 | Same VWM (28 V), but bidirectional; VBR = ±31.1–34.4 V; VC = ±45.4 V; AEC-Q101 qualified | Supports AC-coupled or dual-polarity signal lines; requires symmetric layout vs. unidirectional SMBJ28AH | Choose SAC28 only when protecting bidirectional interfaces (e.g., RS-485) where polarity reversal must be handled |
Compared with SMBJ28A and SAC28, the SMBJ28AH uniquely combines AEC-Q101 qualification, unidirectional polarity, and lowest clamping voltage (45.4 V) in its voltage grade - making it optimal for 24 V automotive DC rails where space, reliability, and precise clamping are critical.
Availability
SMBJ28AH is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, LED lighting driver designs, and CAN bus node protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMBJ28AH 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 - with global distribution and AEC-Q101 validation capabilities.
The SMBJH series was developed specifically for automotive-grade transient suppression, emphasizing low clamping, high surge robustness, and process consistency across voltage grades - targeting body electronics, lighting, and infotainment subsystems.
FAQ
What is the maximum clamping voltage of SMBJ28AH and under what test condition?
The SMBJ28AH has a maximum clamping voltage (VC) of 45.4 V, measured at a peak pulse current (IPP) of 13.8 A using the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed across the operating temperature range and reflects worst-case clamping performance during transient events in 24 V automotive systems.
Is SMBJ28AH suitable for bidirectional signal line protection?
No - SMBJ28AH is a unidirectional TVS diode, intended for DC rail protection where polarity is fixed (e.g., 24 V supply to ground). For bidirectional applications such as RS-485 or USB data lines, a bipolar variant like SAC28 or SMBJ28CAH must be used instead, as SMBJ28AH will conduct only in reverse breakdown and lacks symmetrical clamping.
Does SMBJ28AH meet automotive qualification standards?
Yes - SMBJ28AH is AEC-Q101 qualified and compliant with ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b for automotive transient immunity. It also meets JESD201 Class 2 whisker resistance and J-STD-020 MSL Level 1, confirming suitability for automotive production environments and lead-free reflow processes.
What is the leakage current specification for SMBJ28AH at its working voltage?
The SMBJ28AH exhibits a maximum blocking leakage current (ID) of 1 µA when biased at its rated working stand-off voltage (VWM) of 28 V. This ultra-low leakage ensures minimal power loss in always-on automotive circuits and preserves battery life in sleep-mode vehicle networks.
How does SMBJ28AH differ from SMBJ28H in terms of electrical performance?
SMBJ28AH offers tighter breakdown voltage tolerance (31.1–34.4 V) versus SMBJ28H (31.1–38.0 V), lower clamping voltage (45.4 V vs. 50.0 V), and higher peak pulse current rating (13.8 A vs. 12.6 A). These improvements provide more consistent and robust surge suppression for safety-critical 24 V automotive rails.
SMBJ28AH 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 13.8A
- 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)
SMBJ28AH FAQ
1.How can I place an order for SMBJ28AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28AH 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 SMBJ28AH reliable?
The price and inventory of SMBJ28AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28AH is usually 5 days.
3.What payment methods are accepted for SMBJ28AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28AH?
SMBJ28AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28AH 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 SMBJ28AH?
For technical support, including SMBJ28AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28AH requirements.
6.How does Aetrix verify that SMBJ28AH is sourced from the original manufacturer or authorized distributors?
All SMBJ28AH 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 SMBJ28AH meets industry standards.
7.What is the process for return or replacement of SMBJ28AH?
All SMBJ28AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28AH, 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 SMBJ28AH part is unused and in its original packaging.
Return procedure for SMBJ28AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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