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Taiwan Semiconductor Corporation SMBJ54CA
- Part No.:
- SMBJ54CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ54CA.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:15,897
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Product details
Overview
SMBJ54CA from Taiwan Semiconductor is a bidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 54V working stand-off voltage (VWM), 60.0–73.3V breakdown voltage (VBR) at 1mA test current, and clamps transients to ≤87.1V at 7.2A peak impulse current (IPP), making it suitable for protecting CAN bus interfaces and 48V DC power inputs.
For engineers reviewing the SMBJ54CA datasheet, SMBJ54CA pinout, SMBJ54CA application, or SMBJ54CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, low leakage (<1µA at 54V), and thermal performance with RθJA = 55°C/W - critical for under-hood automotive modules and industrial PLC I/O protection.
Technical Context
The SMBJ54CA implements a silicon avalanche diode structure with glass-passivated junction, enabling sub-nanosecond response (<1.0ps) to fast transients while maintaining stable clamping across -55°C to +150°C junction temperature range. Its bidirectional configuration eliminates polarity sensitivity during board-level ESD events.
Rated for 600W non-repetitive peak pulse power (10/1000µs waveform), it delivers 7.2A maximum peak impulse current (IPP) with clamping voltage VC ≤ 87.1V, ensuring robust protection of downstream 5V–36V logic and analog circuitry without latch-up or thermal runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before conduction begins; sets safe margin above 48V nominal rail. |
| VBR min/max | 60.0 / 73.3 V @ 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system overvoltage thresholds. |
| VC @ IPP | ≤ 87.1 V @ 7.2 A - Clamped voltage during worst-case surge; guarantees downstream ICs see <90V stress. |
| PPK | 600 W (10/1000 µs) - Peak surge energy handling capacity; meets ISO 7637-2 Pulse 5a requirements for 12V/24V systems. |
| ID @ VWM | ≤ 1 µA - Ultra-low leakage at rated stand-off; prevents battery drain in always-on automotive modules. |
| TJ max | +150 °C - Extended junction temperature rating enables use in engine control units and under-hood ECUs. |
| RθJA | 55 °C/W - Thermal resistance from junction to ambient; supports PCB layout with minimal copper area for thermal relief. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional symmetrical construction with cathode band omitted (no polarity marking required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Identical terminals - bidirectional clamping allows placement without orientation check; simplifies automated assembly. |
| Case (cathode band absent) | Thermal and mechanical interface | No polarity marking; case serves as thermal path to PCB copper; requires solder pad per DO-214AA footprint (5.3 × 4.1 mm). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled lines or polarity-agnostic DC rails without external diode pairing. |
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - essential for automotive OEM qualification. |
| Glass-passivated junction | Ensures long-term reliability under humidity and thermal cycling; meets J-STD-020 moisture sensitivity level 1 (unlimited floor life). |
| Fast response time | <1.0 ps reaction to ESD events - protects sensitive CAN transceivers and microcontroller I/O pins before damage occurs. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - supports green manufacturing and export compliance. |
Applications
| Automotive Power Rail Protection | CAN Bus Transient Suppression |
|---|---|
|
Use Scenario: Protecting 48V mild-hybrid vehicle power distribution networks from load-dump surges and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed across main power input to clamp transients before they reach DC-DC converters and MCU power supplies. Use Value: Withstands 600W pulses and clamps to ≤87.1V, preventing brownout or latch-up in 5V/3.3V domain regulators downstream. |
Use Scenario: Shielding high-speed CAN FD physical layer from ESD and coupled noise in body control modules. IC Role / Device Role / Timing Role: Placed differential across CANH/CANL lines to absorb ±8kV contact ESD (IEC 61000-4-2) without signal distortion. Use Value: Sub-1ps response preserves signal integrity up to 5 Mbps; low capacitance (<100 pF at 0V) avoids data eye closure. |
| Industrial Sensor Interface Protection | LED Driver Input Surge Guarding |
|
Use Scenario: Safeguarding 4–20mA current-loop sensors connected to PLC analog inputs in factory automation. IC Role / Device Role / Timing Role: Connected line-to-ground on each sensor input channel to shunt induced lightning-induced surges. Use Value: 7.2A IPP rating handles 1kV/500Ω surge (IEC 61000-4-5 Level 3); 1µA leakage avoids measurement offset errors. |
Use Scenario: Securing constant-current LED drivers powered from unregulated 24–48V industrial supplies subject to switching transients. IC Role / Device Role / Timing Role: Mounted across driver input terminals to clamp inductive kickback from relay-controlled mains feeds. Use Value: 600W PPK rating absorbs repetitive 10/1000µs surges; DO-214AA package supports reflow-compatible high-volume assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ54CA | Same DO-214AC (SMA) package; 600W rating; VBR = 60.0–73.3V; VC = 87.1V @ 7.2A - identical electrical specs but smaller 4.5×2.7mm footprint. | SMA package has lower thermal mass and higher RθJA (70°C/W vs. 55°C/W), limiting sustained surge duty cycle in high-ambient environments. | Select SMAJ54CA only when board space is constrained and thermal derating is acceptable; verify PCB copper area matches SMA thermal requirements. |
| ON Semiconductor SMCJ54CA | DO-214AB (SMC) package; 1500W rating; VBR = 60.0–73.3V; VC = 93.6V @ 16.0A - higher power handling but larger 7.1×6.2mm footprint and higher clamping voltage. | Higher clamping voltage reduces protection margin for 3.3V/5V logic; preferred where multi-pulse or repeated surge exposure is expected. | Choose SMCJ54CA for mission-critical systems requiring >1000W surge margin; avoid if board real estate or low-clamp voltage is prioritized. |
Compared with SMBJ54CA, SMAJ54CA offers identical clamping performance in a smaller package but sacrifices thermal robustness, while SMCJ54CA trades compactness for higher surge endurance and relaxed thermal design - making SMBJ54CA the optimal balance of size, clamping precision, and thermal reliability for automotive and industrial 48V applications.
Availability
SMBJ54CA is available at Aetrix Electronics and suitable for automotive ECU designs, industrial PLC I/O modules, and CAN FD communication interfaces requiring stable component supply and full traceability through production ramp.
Supply support for SMBJ54CA 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, and rectifiers with ISO/TS 16949 certification.
The SMBJ series was engineered specifically for AEC-Q101 qualified automotive transient suppression, emphasizing high-reliability glass-passivated junctions, ISO 7637-2 compliance, and extended temperature operation up to +150°C.
FAQ
What is the polarity configuration of SMBJ54CA?
The SMBJ54CA is a bidirectional TVS diode with symmetrical anode/cathode terminals and no polarity marking. Unlike unidirectional variants (e.g., SMBJ54A), it conducts equally in both directions, making it ideal for AC-coupled signals or polarity-agnostic DC rails such as CAN bus or 48V power inputs where reverse connection risk exists. This eliminates orientation checks during automated placement.
Does SMBJ54CA meet automotive surge immunity standards?
Yes, SMBJ54CA is explicitly validated to meet ISO 7637-2 for automotive transient immunity, covering Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling). Its 600W peak pulse power rating and ≤87.1V clamping voltage ensure compliance with OEM requirements for 12V and 48V vehicle architectures, including mild-hybrid systems.
What is the maximum clamping voltage for SMBJ54CA under surge conditions?
The SMBJ54CA clamps to a maximum of 87.1V at 7.2A peak impulse current (IPP), measured using the standard 10/1000µs double-exponential surge waveform. This value is guaranteed across the full operating temperature range (-55°C to +150°C) and defines the upper voltage limit imposed on protected circuitry during worst-case transients.
How does SMBJ54CA compare to SMBJ54A in terms of electrical behavior?
SMBJ54CA is bidirectional with symmetrical clamping in both polarities, while SMBJ54A is unidirectional and conducts only in reverse bias. SMBJ54CA has identical VWM (54V), VBR (60.0–73.3V), and PPK (600W) ratings but differs in leakage (ID ≤1µA at VWM for both) and application scope - SMBJ54CA protects AC or polarity-agnostic DC paths, whereas SMBJ54A suits DC rails with defined ground reference.
Is SMBJ54CA compliant with environmental regulations?
Yes, SMBJ54CA is RoHS-compliant and halogen-free per IEC 61249-2-21. It uses matte tin-plated leads compatible with J-STD-002 solderability standards and carries J-STD-020 moisture sensitivity level 1 - meaning unlimited floor life at ≤30°C/60% RH, eliminating bake requirements prior to reflow assembly.
SMBJ54CA 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):
- 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)
SMBJ54CA FAQ
1.How can I place an order for SMBJ54CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ54CA 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 SMBJ54CA reliable?
The price and inventory of SMBJ54CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ54CA is usually 5 days.
3.What payment methods are accepted for SMBJ54CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ54CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ54CA?
SMBJ54CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ54CA 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 SMBJ54CA?
For technical support, including SMBJ54CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ54CA requirements.
6.How does Aetrix verify that SMBJ54CA is sourced from the original manufacturer or authorized distributors?
All SMBJ54CA 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 SMBJ54CA meets industry standards.
7.What is the process for return or replacement of SMBJ54CA?
All SMBJ54CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ54CA, 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 SMBJ54CA part is unused and in its original packaging.
Return procedure for SMBJ54CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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