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Taiwan Semiconductor Corporation SMBJ54H
- Part No.:
- SMBJ54H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ54H.pdf
- Description:
- 600W, 66.7V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:5,435
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Product details
Overview
SMBJ54H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade ESD and surge protection in DC power rails and signal lines. It features a 54 V working stand-off voltage (VWM), 60.0–73.3 V breakdown voltage (VBR), 96.3 V maximum clamping voltage (VC) at 6.5 A peak pulse current (IPP), and 600 W peak pulse power (PPK) with <1.0 ps response time. It is AEC-Q101 qualified and used in automotive lighting control modules to protect microcontrollers and CAN transceivers.
For engineers reviewing the SMBJ54H datasheet, SMBJ54H pinout, SMBJ54H application, or SMBJ54H equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b waveforms, unidirectional polarity marking, DO-214AA (SMB) package thermal resistance (RθJA = 55 °C/W), and leakage current ≤1 µA at 54 V.
Technical Context
The SMBJ54H operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold (60.0–73.3 V @ 1 mA). Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1 µA @ VWM), while fast sub-picosecond response enables effective suppression of EFT and lightning-induced transients.
It is rated for 150 °C maximum junction temperature and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity. The device complies with ISO 7637-2 for automotive load-dump and switching transient immunity, and supports automated SMT placement due to its DO-214AA (SMB) outline and matte tin-plated leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min/max | 60.0 / 73.3 V @ 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events |
| VC @ IPP | 96.3 V @ 6.5 A - Clamping voltage limiting downstream IC stress during 10/1000 µs surge |
| PPK | 600 W - Peak non-repetitive surge power handling per IEC 61000-4-5 and ISO 7637-2 |
| ID @ VWM | ≤1 µA - Low leakage preserves system standby current and prevents false triggering |
| TJ max | +150 °C - Enables operation in under-hood automotive environments |
| RθJA | 55 °C/W - Thermal resistance defining PCB copper area requirements for sustained power dissipation |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-diode configuration with cathode band marking for unidirectional polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current input / Surge return path | Connected to protected line (e.g., 54 V rail); conducts during forward-biased surges (rare in unidirectional use) |
| Cathode | Reverse-biased clamping node | Connected to ground or low-impedance reference; sinks transient current when Vreverse > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics |
| Glass-passivated junction | Ensures stable VBR over temperature and lifetime, with reduced parameter drift vs. epoxy-passivated alternatives |
| ISO 7637-2 compliance | Guarantees robustness against real-world automotive transients: Pulse 1 (inductive load dump), Pulse 2a/2b (switching), Pulse 3a/3b (EFT) |
| DO-214AA (SMB) package | Standardized footprint enabling drop-in replacement and compatibility with high-volume SMT assembly lines |
| Moisture sensitivity Level 1 | Eliminates bake-out requirement prior to reflow, reducing manufacturing cost and cycle time |
Applications
| Automotive Lighting Control | Infotainment Power Rail Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontrollers in headlamp control modules exposed to load-dump transients up to 120 V. IC Role / Device Role: Unidirectional TVS placed between 54 V supply rail and chassis ground to clamp surges before they reach sensitive logic. Use Value: Limits voltage seen by downstream ICs to ≤96.3 V during 6.5 A 10/1000 µs pulses, preventing latch-up or gate oxide damage. | Use Scenario: Safeguarding USB-C PD controllers and display power supplies in center-stack infotainment systems. IC Role / Device Role: Standoff protection on 54 V auxiliary rail feeding buck converters powering SoCs and touch controllers. Use Value: Sub-1 ps response ensures clamping occurs before transient energy couples into low-voltage domains, preserving signal integrity. |
| Industrial PLC I/O Protection | EV Battery Management Interface |
Use Scenario: Shielding 24–60 V digital input channels in programmable logic controllers from field-wiring ESD and inductive kickback. IC Role / Device Role: Primary surge shunt on isolated input terminals, paired with series impedance for current limiting. Use Value: 1 µA leakage at 54 V minimizes false-trigger risk in high-impedance sensing circuits while maintaining fast transient response. | Use Scenario: Protecting communication interfaces (e.g., isolated CAN or SPI) between battery cell monitors and main BMS controller. IC Role / Device Role: Secondary-level clamping on 54 V bias rails supplying isolated gate drivers and level shifters. Use Value: AEC-Q101 qualification and 150 °C TJ rating ensure reliability in thermally constrained battery pack enclosures. |
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 SMAJ54A | Same DO-214AC (SMA) package; 93.6 V VC @ 6.5 A; 500 W PPK; not AEC-Q101 qualified | Lower peak power rating and no automotive qualification limit use to industrial/commercial designs | Select when cost sensitivity outweighs automotive compliance and thermal derating margin is acceptable |
| ON Semiconductor 1.5SMC54A | DO-214AB (SMC) package; 93.6 V VC @ 6.5 A; 1500 W PPK; AEC-Q101 qualified; larger footprint | Higher surge capacity suits higher-energy transients but requires PCB layout change | Choose for enhanced robustness in heavy-duty truck or off-highway equipment where space allows |
Compared with SMAJ54A and 1.5SMC54A, the SMBJ54H delivers optimal balance of automotive qualification, compact DO-214AA footprint, and precise 96.3 V clamping-making it ideal for space-constrained, safety-critical 54 V rail protection where layout reuse and supply-chain continuity matter.
Availability
SMBJ54H is available at Aetrix Electronics and suitable for automotive lighting control, infotainment power rail protection, and industrial PLC I/O protection requiring stable component supply across production lifecycles.
Supply support for SMBJ54H 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and MOSFETs for automotive and industrial markets.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in 12 V–48 V automotive subsystems, emphasizing low clamping voltage, tight VBR tolerance, and robust thermal performance in compact SMB packages.
FAQ
What is the maximum clamping voltage of SMBJ54H under standard test conditions?
The SMBJ54H has a maximum clamping voltage (VC) of 96.3 V when subjected to a 10/1000 µs surge waveform at 6.5 A peak impulse current (IPP), per the manufacturer's electrical specifications table. This value defines the upper voltage limit imposed on protected circuitry during transient events and is measured at TA = 25°C. The SMBJ54H maintains this clamping performance across its specified operating temperature range.
Is SMBJ54H suitable for bidirectional transient protection?
No, SMBJ54H is a unidirectional TVS diode, indicated by the absence of "CH" or "CAH" suffix and confirmed by its single cathode band marking. For bidirectional protection, Taiwan Semiconductor specifies SMBJ54CH or SMBJ54CAH variants. Using SMBJ54H in bidirectional applications risks failure during positive-going transients on the anode side, as it lacks symmetrical breakdown characteristics.
What does the "H" suffix in SMBJ54H signify?
The "H" suffix in SMBJ54H denotes Taiwan Semiconductor's high-reliability variant within the SMBJ series, featuring glass passivation, AEC-Q101 qualification, and compliance with JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity. It distinguishes the part from legacy or commercial-grade versions and confirms suitability for automotive under-hood and industrial environments where long-term stability is critical.
How does SMBJ54H compare to SMBJ54AH in terms of breakdown voltage?
SMBJ54H has a breakdown voltage (VBR) range of 60.0–73.3 V at 1 mA test current, while SMBJ54AH offers a tighter 60.0–66.3 V range. The "A" suffix indicates improved VBR uniformity, beneficial in designs requiring precise clamping onset. Both share identical VWM (54 V), VC (96.3 V / 87.1 V), and package (DO-214AA), making SMBJ54AH preferable where tighter parametric control reduces design margin uncertainty.
Can SMBJ54H be used in place of SMBJ54A in existing designs?
SMBJ54H and SMBJ54A share identical electrical parameters (VWM = 54 V, VBR = 60.0–73.3 V, VC = 96.3 V) and DO-214AA package, but SMBJ54H adds AEC-Q101 qualification, glass passivation, and ISO 7637-2 compliance. It is a direct functional and mechanical upgrade-no PCB changes are needed-and enhances reliability in automotive or harsh-environment deployments where SMBJ54A may lack certification.
SMBJ54H 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):
- 54V
- Voltage - Breakdown (Min):
- 60V
- Voltage - Clamping (Max) @ Ipp:
- 96.3V
- Current - Peak Pulse (10/1000µs):
- 6.5A
- 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)
SMBJ54H FAQ
1.How can I place an order for SMBJ54H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ54H 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 SMBJ54H reliable?
The price and inventory of SMBJ54H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ54H is usually 5 days.
3.What payment methods are accepted for SMBJ54H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ54H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ54H?
SMBJ54H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ54H 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 SMBJ54H?
For technical support, including SMBJ54H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ54H requirements.
6.How does Aetrix verify that SMBJ54H is sourced from the original manufacturer or authorized distributors?
All SMBJ54H 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 SMBJ54H meets industry standards.
7.What is the process for return or replacement of SMBJ54H?
All SMBJ54H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ54H, 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 SMBJ54H part is unused and in its original packaging.
Return procedure for SMBJ54H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ54H Tags
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