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Alpha & Omega Semiconductor Inc. SMDJ54A
- Part No.:
- SMDJ54A
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ54A.pdf
- Description:
- 1CH 54V UNIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:6,689
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Product details
Overview
SMDJ54A from Alpha & Omega Semiconductor is a unidirectional transient voltage suppressor diode designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 54 V reverse standoff voltage (VRWM), 60–66.3 V breakdown voltage (VBR) at 1 mA, 87.1 V maximum clamping voltage (VC) at 34.5 A peak pulse current, and 3000 W peak pulse power rating on 10/1000 µs waveform - deployed in industrial motor drives and telecom power supplies.
For engineers reviewing the SMDJ54A datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under 34.5 A surge, thermal resistance (RθJA = 75 °C/W), unidirectional polarity with cathode band marking, DO-214AB package compatibility, and compliance with J-STD-020 MSL Level 1.
Technical Context
The SMDJ54A operates as a silicon avalanche diode optimized for fast transient suppression. Its glass-passivated junction enables sub-1 ps response time from 0 V to breakdown, while the low-profile DO-214AB package supports surface-mount board space efficiency and built-in strain relief for mechanical reliability.
It delivers 3000 W peak pulse power handling on standard 10/1000 µs waveform with 0.01% duty cycle limitation. Thermal design is enabled by RθJL = 15 °C/W (junction-to-lead) and RθJA = 75 °C/W (junction-to-ambient), assuming 8.0 mm × 8.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 54.0 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1 mA | 60.0–66.3 V - Confirmed breakdown range ensuring predictable turn-on during overvoltage events |
| VC @ IPPM=34.5 A | 87.1 V - Clamped voltage limiting downstream circuit stress during 3000 W surge |
| PPPM (10/1000 µs) | 3000 W - Peak surge energy absorption capability without failure |
| TJ max / TSTG | −55 °C to +150 °C - Full industrial temperature range support for harsh environments |
| RθJA | 75 °C/W - Thermal resistance defining required PCB copper area for safe steady-state operation |
| IR @ VRWM | 2.0 µA - Low leakage preserving system efficiency in standby and low-power modes |
Pinout & Package
DO-214AB (SMC J-Bend) molded plastic package with matte tin lead-free plating; cathode denoted by color band; terminals solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; grounded or connected to lower-potential rail | Enables unidirectional clamping from cathode to anode during reverse transients |
| Cathode | Marked terminal (color band); connects to protected line or supply rail | Defines polarity: clamps when cathode voltage exceeds anode by ≥60 V |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Enables suppression of nanosecond-scale ESD and lightning-induced spikes before IC damage occurs |
| Glass passivated junction | Improved long-term reliability and stable VBR drift under thermal cycling and humidity exposure |
| Built-in strain relief | Reduces mechanical stress at lead-to-body interface during board flexure or thermal expansion |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning or baking |
| UL 94V-0 flammability rating | Self-extinguishing plastic housing meets safety requirements for enclosed industrial equipment |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of IGBT gate drivers and DC bus sensing circuits against switching-induced voltage spikes and load dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC link or gate resistor to clamp overshoot below MOSFET/IGBT breakdown thresholds. Use Value: Limits transient voltage to ≤87.1 V at 34.5 A, preventing gate oxide rupture and ensuring >100,000 surge cycles per JEDEC standards. | Use Scenario: Input-stage surge protection on −48 V DC telecom rectifier outputs exposed to lightning-induced surges on distribution lines. IC Role / Device Role / Timing Role: Primary clamping device on secondary-side DC output, coordinated with upstream MOVs and fuses. Use Value: Absorbs 3000 W pulses without degradation, maintaining <2.0 µA leakage to preserve no-load efficiency and remote monitoring accuracy. |
| Automotive Body Control Modules | Industrial PLC I/O Modules |
Use Scenario: CAN/LIN bus line protection and 12 V power rail hardening in BCMs subjected to ISO 7637-2 Pulse 1/2/5a. IC Role / Device Role / Timing Role: Secondary-level TVS after common-mode chokes, guarding microcontroller IO pins and regulator inputs. Use Value: Sub-1 ps response ensures clamping before transients propagate into 3.3 V logic domains; DO-214AB footprint fits constrained PCB real estate. | Use Scenario: Digital input channel protection against field-wiring induced surges (e.g., 24 V sensor loop faults, inductive kickback). IC Role / Device Role / Timing Role: Front-end unidirectional suppressor on optocoupler input side, referenced to isolated ground. Use Value: 87.1 V clamping prevents optocoupler LED overvoltage while RθJA = 75 °C/W allows thermal management with minimal heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC54A (Littelfuse) | Same DO-214AB package, identical VRWM (54 V), but higher VC = 89.0 V at 34.5 A | Marginally higher clamping increases risk of downstream component overstress in tight-voltage-margin designs | Select SMDJ54A when clamping voltage headroom is critical; SAC54A acceptable where 1.9 V higher VC is tolerable |
| 1.5KE54A (ON Semiconductor) | Through-hole DO-201AE package; same electrical specs but incompatible mounting and thermal path | Requires PCB redesign and eliminates surface-mount assembly efficiency | Choose SMDJ54A for automated SMT production; 1.5KE54A only for legacy through-hole systems or prototyping |
Compared with SAC54A and 1.5KE54A, the SMDJ54A offers the lowest clamping voltage in its class and full SMT compatibility - enabling compact, high-reliability surge protection without layout compromise or thermal derating penalties.
Availability
SMDJ54A is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply, RoHS-compliant packaging, and traceable sourcing.
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
Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-efficiency MOSFETs, TVS diodes, and power ICs for industrial, computing, and communications markets.
The SMDJ series is engineered for robust transient suppression in high-power DC systems, emphasizing low clamping voltage, fast response, and MSL-1 manufacturability - targeting applications where reliability under repetitive surge stress is non-negotiable.
FAQ
What is the maximum clamping voltage of the SMDJ54A under rated surge conditions?
The SMDJ54A exhibits a maximum clamping voltage (VC) of 87.1 V when subjected to its rated peak pulse current of 34.5 A on a 10/1000 µs waveform. This value is measured per industry-standard test conditions and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components remain within absolute maximum ratings.
Does the SMDJ54A support lead-free reflow soldering without special handling?
Yes, the SMDJ54A meets J-STD-020 MSL Level 1 with a maximum peak reflow temperature of 260 °C and requires no moisture sensitivity preconditioning or baking prior to assembly. Its matte tin lead-free plating and DO-214AB package are fully compatible with standard Pb-free reflow profiles used in high-volume SMT manufacturing.
How does the thermal resistance of the SMDJ54A affect PCB layout?
The SMDJ54A has a junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To maintain TJ ≤ 150 °C under worst-case power dissipation, designers must allocate sufficient copper area and consider airflow or adjacent heat sources - undersized pads will cause premature thermal shutdown or parametric shift.
Is the SMDJ54A suitable for bidirectional surge protection?
No, the SMDJ54A is unidirectional only, indicated by the "A" suffix and single cathode band marking. For bidirectional protection at 54 V, the correct variant is SMDJ54CA (marked DGE), which provides symmetrical clamping in both polarities and is electrically characterized in both directions per datasheet specifications.
What is the leakage current specification for the SMDJ54A at its rated standoff voltage?
The SMDJ54A specifies a maximum reverse leakage current (IR) of 2.0 µA at its rated reverse standoff voltage (VRWM) of 54.0 V and ambient temperature of 25 °C. This low leakage preserves system efficiency in always-on or battery-backed applications and avoids false triggering in high-impedance sensing circuits.
SMDJ54A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- 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):
- 34.5A
- Power - Peak Pulse:
- 3000W (3kW)
- 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-214AB
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.
SMDJ54A Tags
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