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Taiwan Semiconductor Corporation SMDJ28A
- Part No.:
- SMDJ28A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ28A.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,806
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Product details
Overview
SMDJ28A from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode with a working stand-off voltage of 28 V, breakdown voltage range of 31.1–34.4 V at 1 mA test current, and clamping voltage of 45.4 V at 66.1 A peak pulse current. It is designed for robust ESD and surge protection in DC power rails and signal lines of industrial control systems.
For engineers reviewing the SMDJ28A datasheet, SMDJ28A pinout, SMDJ28A application, or SMDJ28A equivalent, key selection criteria include its DO-214AB (SMC) package compatibility, 175 °C maximum junction temperature, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1 ps response time, and verified clamping performance under 10/1000 µs transients.
Technical Context
The SMDJ28A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified breakdown threshold (31.1–34.4 V). Its glass-passivated junction ensures stable leakage (<1 µA at 28 V) and repeatable clamping behavior across temperature.
It delivers 3000 W peak pulse power (10/1000 µs waveform), with thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), enabling reliable operation in high-power transient events without thermal runaway under proper PCB layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1 mA | 31.1–34.4 V - Verified avalanche initiation range ensuring predictable turn-on margin |
| VC @ IPPM=66.1 A | 45.4 V - Clamped voltage during 3000 W transient, limiting downstream stress |
| IPPM | 66.1 A - Peak pulse current capability under standardized 10/1000 µs waveform |
| PPK | 3000 W - Peak pulse power rating defining maximum transient energy absorption |
| TJ max | 175 °C - Maximum junction temperature supporting operation in harsh ambient environments |
| RθJA | 75 °C/W - Thermal resistance used to calculate junction temperature rise under steady-state dissipation |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, single-diode configuration with cathode band marking. Matte tin-plated leads, moisture sensitivity level 1 (J-STD-020), UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to lower-potential side (e.g., ground or return path) in unidirectional protection |
| Cathode | Clamping output / Surge current sink | Connected to protected line; conducts transient current to anode during overvoltage event |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term stability of breakdown voltage and low leakage (<1 µA at VWM) across temperature and life cycle |
| ISO 7637-2 compliance | Validated performance against automotive load-dump and switching transient pulses (Pulse 1/2a/2b/3a/3b) |
| Sub-1 ps response time | Enables suppression of fast-rising ESD and lightning-induced transients before sensitive ICs are damaged |
| DO-214AB mechanical robustness | Supports automated placement and withstands board flexure; meets JESD201 Class 2 whisker resistance |
| Halogen-free & RoHS compliant | Fulfills environmental compliance requirements for industrial and consumer end equipment |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of gate drivers and feedback sensing circuits against inductive kickback and input surges in variable-frequency drives. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus or gate-source terminals to clamp transients below MOSFET/IGBT breakdown limits. Use Value: Limits clamping voltage to 45.4 V at 66.1 A, preventing destructive overvoltage on 30–60 V rated power semiconductors. | Use Scenario: Input-stage surge suppression on 48 V telecom rectifier outputs exposed to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary-level TVS on secondary-side DC distribution, coordinated with upstream MOVs and filters. Use Value: Absorbs 3000 W peak pulse energy while maintaining <1 µA leakage at 28 V nominal rail, minimizing standby loss. |
| Automotive Body Control Modules | Programmable Logic Controllers |
Use Scenario: CAN/LIN bus line protection and microcontroller I/O port hardening against ESD and battery dump events. IC Role / Device Role / Timing Role: Localized TVS on each protected node, leveraging fast response (<1 ps) to suppress sub-nanosecond ESD events. Use Value: Meets ISO 7637-2 Pulse 2b (inductive switch-off) with clamping below 45.4 V, preserving signal integrity on 24 V logic interfaces. | Use Scenario: Field I/O terminal protection in modular PLC backplanes handling 24 V sensor/actuator signals. IC Role / Device Role / Timing Role: Point-of-entry TVS on digital input channels, placed before optocouplers or level shifters. Use Value: Withstands repeated 66.1 A transients without parameter drift, validated per JEDEC JESD22-A114 ESD testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC28 | Lower peak power (1500 W), higher VC (53 V @ 33 A), same DO-214AB package | Not suitable for 3000 W transients; limited to lower-energy ESD-only scenarios | Select only if system-level testing confirms 1500 W sufficiency and 53 V clamping is acceptable |
| 1.5SMC28A | Same VWM/VBR specs, identical DO-214AB package, but rated at 1500 W PPK | Lacks ISO 7637-2 validation; not qualified for automotive load-dump immunity | Acceptable for non-automotive industrial use where 1500 W transient energy is sufficient |
Compared with SAC28 and 1.5SMC28A, the SMDJ28A provides 100% higher peak power rating (3000 W vs. 1500 W), lower clamping voltage (45.4 V vs. ≥53 V), and certified ISO 7637-2 compliance-making it the only option among the three qualified for demanding automotive and industrial surge environments.
Availability
SMDJ28A is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and programmable logic controllers requiring stable component supply and full-specification surge immunity.
Supply support for SMDJ28A 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, automotive, and computing markets.
The SMDJ series was developed specifically for high-energy transient suppression in surface-mount power electronics, emphasizing reliability under repetitive surge stress and compliance with international automotive and industrial immunity standards.
FAQ
What is the maximum clamping voltage of the SMDJ28A under standard test conditions?
The SMDJ28A has a maximum clamping voltage (VC) of 45.4 V when subjected to a 10/1000 µs waveform with a peak pulse current (IPPM) of 66.1 A. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during a 3000 W transient event. The SMDJ28A maintains this clamping performance across its specified operating temperature range.
Is the SMDJ28A suitable for bidirectional transient protection?
No, the SMDJ28A is a unidirectional TVS diode intended for DC line protection where polarity is fixed. For bidirectional applications, the SMDJ28CA variant must be used-it features symmetrical breakdown in both directions and is marked with "DFG" code. The SMDJ28A's cathode band indicates polarity and must be oriented correctly in-circuit to avoid forward conduction during normal operation.
Does the SMDJ28A meet automotive transient immunity standards?
Yes, the SMDJ28A meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b, making it suitable for automotive electronic control units, body modules, and infotainment systems. This qualification is explicitly stated in Taiwan Semiconductor's official datasheet (Version I2104) and verified through standardized load-dump and switching transient testing.
What is the thermal resistance of the SMDJ28A, and how does it affect PCB layout?
The SMDJ28A has a junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W. To maintain safe junction temperatures during repetitive surges, PCB copper area connected to both terminals should exceed 40 mm² per pad, with internal thermal vias recommended. The SMDJ28A's thermal performance is optimized for DO-214AB footprint adherence per TSC's suggested pad layout.
How does the SMDJ28A compare to the SMDJ28CA in terms of electrical behavior?
The SMDJ28A is unidirectional with forward conduction only; the SMDJ28CA is bidirectional and exhibits symmetric breakdown (31.1–34.4 V) in both polarities. Both share identical VWM (28 V), PPK (3000 W), and clamping voltage (45.4 V), but the SMDJ28CA replaces the cathode band with center-marked polarity and is used in AC-coupled or floating signal lines. The SMDJ28A cannot substitute for the SMDJ28CA in bidirectional applications.
SMDJ28A 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 66.1A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ28A FAQ
1.How can I place an order for SMDJ28A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ28A 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 SMDJ28A reliable?
The price and inventory of SMDJ28A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ28A is usually 5 days.
3.What payment methods are accepted for SMDJ28A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ28A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ28A?
SMDJ28A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ28A 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 SMDJ28A?
For technical support, including SMDJ28A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ28A requirements.
6.How does Aetrix verify that SMDJ28A is sourced from the original manufacturer or authorized distributors?
All SMDJ28A 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 SMDJ28A meets industry standards.
7.What is the process for return or replacement of SMDJ28A?
All SMDJ28A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ28A, 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 SMDJ28A part is unused and in its original packaging.
Return procedure for SMDJ28A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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