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Taiwan Semiconductor Corporation SMDJ54A
- Part No.:
- SMDJ54A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ54A.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,034
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Product details
Overview
SMDJ54A from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 54V working stand-off voltage (VWM), 60.0–66.3V breakdown voltage (VBR), and 87.1V maximum clamping voltage (VC) at 34.4A peak pulse current - used to protect power rails and I/O lines in industrial motor drives against lightning-induced surges and load-switching transients.
For engineers reviewing the SMDJ54A datasheet, SMDJ54A pinout, SMDJ54A application, or SMDJ54A equivalent, key selection criteria include clamping performance under 10/1000μs waveform, thermal resistance (RθJA = 75°C/W), compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The SMDJ54A operates as a single-die, unidirectional avalanche diode optimized for high-energy transient suppression. Its glass-passivated junction enables fast response (<1.0 ps) and stable VBR tolerance (±5% typical), while its DO-214AB package supports automated placement and meets UL 94V-0 flammability rating.
Designed for non-repetitive surge events, it delivers 3000W peak pulse power (tp = 1 ms) with derating above 25°C per Fig.2, and sustains 6.5W steady-state dissipation. Junction temperature range is –55°C to +175°C, and it exhibits 3.5V forward voltage at 100A for unidirectional conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1mA | 60.0–66.3 V - Breakdown threshold defining reliable avalanche onset under standardized test current |
| VC @ IPPM=34.4A | 87.1 V - Clamped voltage during 10/1000μs surge, limiting stress on downstream ICs |
| PPK | 3000 W - Peak pulse power handling capability for transient immunity per ISO 7637-2 |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient, critical for board-level thermal design |
| IR @ VWM | 1 μA - Reverse leakage at rated stand-off, ensuring minimal standby power loss |
| TJ max | +175 °C - Maximum junction temperature enabling operation in high-ambient industrial environments |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Matte tin-plated leads, J-STD-002 solderable, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path during clamping |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 48V rail); marked by band for orientation |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR over lifetime and improved reliability vs. epoxy-passivated alternatives |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive and industrial vehicle subsystems subject to battery disconnect/load dump |
| Fast response time <1.0 ps | Clamps before sensitive logic or analog circuitry experiences overvoltage damage |
| UL 94V-0 molding compound | Meets flame-retardancy requirements for enclosed industrial enclosures and power supplies |
| J-STD-020 Level 1 moisture sensitivity | Enables standard reflow without baking or special handling prior to assembly |
Applications
| Industrial Motor Drives | 48V DC Power Distribution |
|---|---|
Use Scenario: Protection of gate drivers and feedback sensors in variable-frequency drives exposed to IGBT switching noise and back-EMF spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus inputs to clamp repetitive 100–500V transients. Use Value: Limits clamped voltage to 87.1V, preventing latch-up or oxide breakdown in isolated gate drivers rated for ≤100V absolute max. | Use Scenario: Surge protection on 48V auxiliary power rails feeding PLC I/O modules and fieldbus transceivers. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing ISO 7637-2 Pulse 2b (load dump) energy up to 3000W. Use Value: Maintains system uptime by surviving >1000 surges at rated PPK without parameter shift or failure. |
| Telecom Remote Radio Units | Factory Automation Sensors |
Use Scenario: Input protection for PoE-powered remote radio units subjected to induced lightning surges on outdoor cabling. IC Role / Device Role / Timing Role: First-stage clamping device on DC input, coordinated with upstream GDT and downstream polymer PTC. Use Value: Fast <1ps response ensures coordination with slower secondary protectors, minimizing let-through energy. | Use Scenario: ESD and surge hardening of analog 4–20mA sensor outputs in dusty, high-noise factory environments. IC Role / Device Role / Timing Role: Low-leakage (1μA) TVS preserving signal integrity while suppressing ±2kV contact ESD per IEC 61000-4-2. Use Value: Prevents offset drift or zero-point error in precision current loops caused by transient-induced junction heating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC54 | Lower PPK (1500W), same VWM/VBR range, smaller DO-214AA (SMB) package | Not suitable for ISO 7637-2 Pulse 1 or 3b; limited to lower-energy ESD/lightning scenarios | Select when board space is constrained and surge threat level is reduced (e.g., indoor-only equipment) |
| 1.5KE54A | Through-hole TO-218 package, identical electrical specs but higher RθJA (~50°C/W), no automated placement support | Requires wave soldering or hand assembly; incompatible with high-volume SMT lines | Choose only for legacy through-hole designs or prototyping where rework flexibility outweighs production efficiency |
Compared with SAC54 and 1.5KE54A, the SMDJ54A uniquely balances 3000W surge capacity, SMT manufacturability, and ISO 7637-2 compliance in a compact DO-214AB footprint - making it optimal for volume-produced industrial controllers requiring robust, automated ESD/surge protection.
Availability
SMDJ54A is available at Aetrix Electronics and suitable for industrial motor drives, 48V DC power distribution systems, telecom remote radio units, and factory automation sensors requiring stable component supply and long-term lifecycle assurance.
Supply support for SMDJ54A 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 for industrial and automotive markets.
The SMDJ series was developed specifically for high-reliability, surface-mount transient suppression in harsh electromagnetic environments - targeting applications demanding ISO 7637-2 compliance and extended temperature operation.
FAQ
What is the maximum clamping voltage of the SMDJ54A under standard 10/1000μs surge conditions?
The SMDJ54A has a maximum clamping voltage (VC) of 87.1 V when subjected to its rated peak pulse current of 34.4 A under the 10/1000μs waveform defined in IEC 61000-4-5. This value is measured at TA = 25°C and ensures downstream components see limited overvoltage stress during transient events. The SMDJ54A maintains this clamping performance across its full operating temperature range, supporting robust design in industrial environments.
Does the SMDJ54A meet automotive transient immunity standards?
Yes, the SMDJ54A meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply line inductance), and Pulses 3a/3b (capacitive coupling and ignition noise). It is qualified for use in automotive sub-systems such as body control modules and infotainment power supplies - though not intended for safety-critical or medical applications per TSC's notice.
What is the polarity configuration of the SMDJ54A and how is it identified on the device?
The SMDJ54A is a unidirectional TVS diode with anode and cathode terminals. Polarity is indicated by a cathode band printed on the device body - consistent with DO-214AB (SMC) marking conventions. This band must align with the PCB's designated cathode pad during placement to ensure proper surge conduction from protected line to ground. Bidirectional variants (e.g., SMDJ54CA) use different marking codes and lack the band.
Can the SMDJ54A be used in parallel to increase surge current handling?
No - the SMDJ54A is not recommended for parallel operation due to inherent VBR mismatch between units, which causes uneven current sharing and potential thermal runaway. For higher current capability, select a higher-power TVS (e.g., SMDJ64A) or implement staged protection with upstream GDTs and downstream low-capacitance TVS arrays. The SMDJ54A is characterized and tested as a single-device solution.
What is the moisture sensitivity level (MSL) and reflow profile compatibility of the SMDJ54A?
The SMDJ54A is rated MSL Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/60% RH and withstand standard lead-free reflow profiles (peak 260°C) without preconditioning or baking. Its matte tin-plated leads comply with J-STD-002 for solderability, and the UL 94V-0 molding compound ensures process stability during SMT assembly - making the SMDJ54A fully compatible with high-volume automated manufacturing.
SMDJ54A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMDJ
- 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):
- 34.4A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ54A FAQ
1.How can I place an order for SMDJ54A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ54A 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 SMDJ54A reliable?
The price and inventory of SMDJ54A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ54A is usually 5 days.
3.What payment methods are accepted for SMDJ54A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ54A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ54A?
SMDJ54A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ54A 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 SMDJ54A?
For technical support, including SMDJ54A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ54A requirements.
6.How does Aetrix verify that SMDJ54A is sourced from the original manufacturer or authorized distributors?
All SMDJ54A 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 SMDJ54A meets industry standards.
7.What is the process for return or replacement of SMDJ54A?
All SMDJ54A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ54A, 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 SMDJ54A part is unused and in its original packaging.
Return procedure for SMDJ54A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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