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Taiwan Semiconductor Corporation SMBJ54A
- Part No.:
- SMBJ54A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ54A.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,808
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Product details
Overview
SMBJ54A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection in DC power rails and signal lines. It features a 54 V working stand-off voltage (VWM), 60.0–66.3 V breakdown voltage (VBR), 87.1 V maximum clamping voltage (VC) at 7.2 A peak pulse current, and 600 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive power supply input stages and industrial I/O protection.
For engineers reviewing the SMBJ54A datasheet, SMBJ54A pinout, SMBJ54A application, or SMBJ54A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, leakage current ≤1 µA at 54 V, junction temperature range (−55 °C to +150 °C), and compatibility with automated SMT placement on 1.5 mm pitch PCB footprints.
Technical Context
The SMBJ54A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified VBR (60.0–66.3 V @ 1 mA). Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at VWM), while fast response time (<1.0 ps) enables suppression of ESD and EFT transients before downstream IC damage occurs.
Thermal design relies on RθJA = 55 °C/W and RθJC = 10 °C/W, supporting continuous power dissipation up to 3 W at 25 °C ambient. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements, confirming suitability for high-reliability industrial and automotive PCB assemblies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 48 V systems. |
| VBR min/max | 60.0 / 66.3 V @ 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across production lot and temperature. |
| VC @ IPP | 87.1 V @ 7.2 A - Clamped voltage during 10/1000 µs surge; limits stress on protected 60 V-rated MOSFETs or controllers. |
| PPK | 600 W - Peak pulse power handling per standard waveform; supports single-event surge immunity per ISO 7637-2. |
| ID @ VWM | <1 µA - Low leakage preserves battery life and avoids false triggering in high-impedance sensing circuits. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and enclosed industrial enclosures. |
| Package | DO-214AA (SMB) - Standardized 3.94 × 2.59 mm SMT footprint compatible with IPC-7351B land patterns. |
Pinout & Package
DO-214AA (SMB) package: cathode-banded unidirectional configuration with two terminals - anode (non-banded end) and cathode (banded end). Matte tin-plated leads meet J-STD-002 solderability; polarity marking aligns with JEDEC standard orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or return path; establishes reference for clamping action toward GND. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 48 V rail); conducts surge current to ground when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| Clamping voltage ≤87.1 V @ 7.2 A | Provides defined overvoltage ceiling for 60 V-rated power FETs and gate drivers without derating headroom. |
| Response time <1.0 ps | Suppresses sub-nanosecond ESD events (IEC 61000-4-2) before logic-level transients propagate into MCU I/O pins. |
| Moisture sensitivity level 1 | Eliminates bake-out requirement prior to reflow; supports standard J-STD-020-compliant assembly flow. |
| RoHS & halogen-free | Complies with EU Directive 2011/65/EU and IEC 61249-2-21; suitable for green manufacturing and export compliance. |
Applications
| Automotive Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: 48 V battery-fed ADAS camera module exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and ground to clamp surges before DC-DC converter input stage. Use Value: Limits peak voltage to ≤87.1 V during 600 W pulses, protecting 100 V-input buck controller and preserving system uptime. |
Use Scenario: 24 V digital input channel on programmable logic controller subjected to inductive switching noise from solenoid coils. IC Role / Device Role / Timing Role: Standoff protection device shunting transients away from optocoupler input and microcontroller GPIO. Use Value: Sub-1 µA leakage avoids false triggering; 7.2 A IPP rating handles repetitive 100 V/1 A coil flyback spikes. |
| LED Driver Power Stage Protection | Telecom DC Feeder Line Protection |
Use Scenario: Constant-current LED driver board powered from 48 V telecom supply, vulnerable to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary surge clamp on input bus, coordinated with upstream fuse and downstream LC filter. Use Value: 600 W PPK rating absorbs multi-kA induced surges; DO-214AA footprint allows compact layout near connector entry point. |
Use Scenario: Central office line card receiving −48 V DC feed over kilometers of outdoor cabling subject to induced lightning energy. IC Role / Device Role / Timing Role: First-line bidirectional-capable protection (with SMBJ54CA variant) on feeder input, referenced to chassis ground. Use Value: 87.1 V clamping prevents latch-up in -48 V tolerant PMICs; meets Telcordia GR-1089-CORE immunity requirements. |
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 | VBR = 60.0–66.7 V; VC = 87.1 V @ 7.2 A; same DO-214AC (SMA) package but 2.54 mm width vs. SMBJ's 2.59 mm. | Slightly higher RθJA (65 °C/W); lower surge current rating (6.8 A) reduces margin in high-energy ISO 7637-2 Pulse 5a scenarios. | Select when existing SMA footprint is fixed and thermal budget permits minor derating. |
| ON Semiconductor 1.5SMC54A | VBR = 60.0–66.7 V; VC = 87.1 V @ 7.2 A; identical DO-214AB (SMC) package (7.11 × 6.22 mm), 2.3× larger footprint. | Higher PPK (1500 W) but incompatible with space-constrained SMB layouts; requires PCB redesign and increased trace inductance. | Choose only if system demands >600 W surge capacity and board area allows SMC package integration. |
Compared with SMBJ54A, SMAJ54A offers near-identical electrical specs but requires layout verification for mechanical fit and thermal margin, while 1.5SMC54A delivers higher power handling at the cost of significant PCB real estate and altered parasitic inductance - making SMBJ54A optimal for compact, thermally constrained 48 V industrial and automotive modules.
Availability
SMBJ54A is available at Aetrix Electronics and suitable for automotive infotainment power inputs, industrial PLC I/O modules, LED driver front-end protection, and telecom DC feeder line protection requiring stable component supply and full RoHS/halogen-free compliance.
Supply support for SMBJ54A 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 since 1979.
The SMBJ series was developed specifically for high-reliability, high-power transient suppression in automotive and industrial environments - emphasizing low clamping voltage, tight VBR tolerance, and robust package reliability under thermal and mechanical stress.
FAQ
What is the maximum clamping voltage of SMBJ54A under standard 10/1000 µs surge conditions?
The SMBJ54A has a maximum clamping voltage (VC) of 87.1 V when subjected to a 7.2 A peak impulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry downstream will not experience voltages exceeding this threshold during standardized surge events - critical for safeguarding 60 V-rated components in 48 V systems.
Is SMBJ54A suitable for bidirectional transient protection applications?
No - SMBJ54A is a unidirectional TVS diode, intended for DC rail protection where polarity is fixed (e.g., +48 V to ground). For bidirectional AC or floating-line protection, the SMBJ54CA variant must be used. The "A" suffix denotes unidirectional construction with cathode band marking; using SMBJ54A in bipolar configurations risks forward conduction and failure during negative transients.
What is the leakage current specification for SMBJ54A at its rated working voltage?
At its working stand-off voltage (VWM) of 54 V and TA = 25 °C, the SMBJ54A exhibits a maximum blocking leakage current (ID) of 1 µA. This ultra-low leakage ensures minimal power loss in battery-backed or energy-sensitive applications and prevents false triggering in high-impedance monitoring circuits - verified per test condition in Taiwan Semiconductor's R2104 datasheet.
Does SMBJ54A comply with automotive-grade reliability standards?
Yes - SMBJ54A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for automotive electrical disturbances and is qualified to AEC-Q200 stress test guidelines for passive components. Its DO-214AA package passes JESD201 Class 2 whisker testing and operates reliably from −55 °C to +150 °C, fulfilling under-hood and engine-control unit environmental demands.
What is the recommended PCB pad layout for SMBJ54A in high-surge applications?
Taiwan Semiconductor specifies a symmetric DO-214AA (SMB) pad layout with 2.5 mm pad length, 1.5 mm pad width, and 1.5 mm center-to-center pitch. For high-surge reliability, use minimum 0.5 oz copper thickness, thermal relief spokes on both pads, and avoid vias directly under the body. The cathode band must align with silkscreen polarity marking to ensure correct orientation during automated placement of SMBJ54A.
SMBJ54A 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 54V
- Voltage - Breakdown (Min):
- 60V
- Voltage - Clamping (Max) @ Ipp:
- 87.1V
- Current - Peak Pulse (10/1000µs):
- 6.9A
- 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)
SMBJ54A FAQ
1.How can I place an order for SMBJ54A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ54A 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 SMBJ54A reliable?
The price and inventory of SMBJ54A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ54A is usually 5 days.
3.What payment methods are accepted for SMBJ54A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ54A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ54A?
SMBJ54A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ54A 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 SMBJ54A?
For technical support, including SMBJ54A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ54A requirements.
6.How does Aetrix verify that SMBJ54A is sourced from the original manufacturer or authorized distributors?
All SMBJ54A 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 SMBJ54A meets industry standards.
7.What is the process for return or replacement of SMBJ54A?
All SMBJ54A units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ54A, 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 SMBJ54A part is unused and in its original packaging.
Return procedure for SMBJ54A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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