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Taiwan Semiconductor Corporation SMDJ75A
- Part No.:
- SMDJ75A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ75A.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,736
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Product details
Overview
SMDJ75A from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode with a working stand-off voltage of 75 V, breakdown voltage range 83.3–92.1 V, and clamping voltage of 121 V at 24.8 A peak pulse current. It is designed for robust ESD and surge protection in DC power rails and signal lines of industrial power supplies and telecom infrastructure.
For engineers reviewing the SMDJ75A datasheet, SMDJ75A pinout, SMDJ75A application, or SMDJ75A 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 unidirectional clamping behavior under fast transients.
Technical Context
The SMDJ75A operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified breakdown range (83.3–92.1 V at 1 mA test current). Its clamping action limits transient energy to ≤121 V at 24.8 A (10/1000 µs waveform), enabling protection of downstream ICs rated for ≤100 V DC operation.
Thermally, it features a junction-to-ambient thermal resistance of 75 °C/W and junction-to-lead resistance of 15 °C/W, supporting sustained dissipation up to 6.5 W at 25 °C ambient. It meets J-STD-020 moisture sensitivity level 1 and JESD 201 class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe DC rail margin. |
| VBR @ IT=1 mA | 83.3–92.1 V - Breakdown onset range; ensures reliable turn-on above system nominal voltage. |
| VC @ IPPM=24.8 A | 121 V - Clamped voltage during 10/1000 µs surge; determines protected circuit's voltage stress ceiling. |
| PPK | 3000 W - Peak pulse power handling (1 ms); supports high-energy lightning-induced surges per IEC 61000-4-5. |
| TJ max | 175 °C - Maximum junction temperature; enables operation in high-ambient industrial environments. |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient; informs PCB copper area and airflow requirements. |
| Response time | <1.0 ps - Avalanche initiation speed; ensures suppression before sensitive logic or analog circuits are disturbed. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Matte tin-plated leads, UL 94V-0 molding compound, 0.290 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / surge return node | Connected to ground or low-impedance return plane; carries full surge current during clamping. |
| Cathode | Protected line connection / high-side terminal | Connected to the line being protected (e.g., +75 V rail); reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable breakdown voltage and long-term reliability under repeated surge stress without parameter drift. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive-level load-dump and inductive-switching transients, extending use beyond industrial into vehicle ECUs. |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking or special handling-reduces manufacturing cost and risk of popcorning. |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental compliance mandates for export-ready industrial and telecom equipment. |
| Fast response & low clamping ratio | VC/VBR ≈ 1.31 enables tighter voltage margins than typical TVS devices, improving compatibility with 100 V-rated MOSFETs and controllers. |
Applications
| Industrial Power Supply Protection | Telecom DC Feeder Line Protection |
|---|---|
Use Scenario: 48 V DC input stage of programmable logic controller (PLC) power module exposed to inductive switching noise and accidental wiring faults. IC Role / Device Role / Timing Role: Unidirectional TVS clamp on input rail, absorbing >3 kV EFT bursts and 1 kA lightning surges per IEC 61000-4-4/5. Use Value: Limits rail voltage to ≤121 V, preventing damage to upstream rectifier diodes and downstream buck controller ICs rated for 100 V max. | Use Scenario: -48 V DC feed line in central office telecom shelf, subject to induced surges from nearby AC mains or lightning coupling. IC Role / Device Role / Timing Role: Primary overvoltage protector at line entry point, placed before DC-DC converters and line interface ICs. Use Value: Withstands 3000 W pulses while maintaining <1 µA leakage at -48 V, preserving system standby power budget and ensuring fail-safe shutdown. |
| Automotive Body Control Module (BCM) | Renewable Energy Inverter DC Link |
Use Scenario: 12 V battery-supplied BCM input subjected to ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 3b (capacitive discharge). IC Role / Device Role / Timing Role: Front-end TVS on main power rail, coordinated with fuse and LC filter for comprehensive transient immunity. Use Value: Clamps Pulse 1 to ≤121 V within <1 ps, protecting CAN transceivers and microcontroller I/O pins rated for 5.5 V absolute max. | Use Scenario: DC link between PV array and MPPT converter in solar microinverter, where voltage can reach 75 V under open-circuit conditions. IC Role / Device Role / Timing Role: Overvoltage limiter on high-side DC bus, guarding against grid fault-induced transients and capacitor charging overshoot. Use Value: Handles repetitive 3000 W surges without degradation, supporting 25-year field life in outdoor installations with wide thermal cycling (-40 to +85 °C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75A (Bourns) | Same DO-214AA (SMB) package; lower PPK = 600 W; VC = 121 V @ 4.9 A. | Not suitable for 3000 W surge events; limited to low-energy ESD and EFT. | Select only if system-level testing confirms worst-case surge energy remains below 600 W. |
| 1.5KE75A (ON Semiconductor) | Through-hole DO-201 package; PPK = 1500 W; VC = 121 V @ 12.4 A; higher RθJA (~100 °C/W). | Requires PCB through-holes and manual assembly; unsuitable for high-density automated production. | Use only for legacy designs or prototyping where SMT is unavailable; not recommended for volume production. |
Compared with SMBJ75A and 1.5KE75A, the SMDJ75A delivers triple the peak power rating in an SMT-optimized DO-214AB package, enabling compact, high-reliability protection for 75 V DC systems without compromising surge immunity or manufacturability.
Availability
SMDJ75A is available at Aetrix Electronics and suitable for industrial power supply protection, telecom DC feeder line protection, automotive body control modules, and renewable energy inverter DC link applications requiring stable component supply and long-term lifecycle support.
Supply support for SMDJ75A 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, rectifiers, and MOSFETs for industrial and automotive markets.
The SMDJ series is part of TSC's high-power surface-mount TVS platform, engineered specifically for robust, automated-soldering-compatible surge protection in harsh-environment DC power systems.
FAQ
What is the polarity configuration of the SMDJ75A?
The SMDJ75A is a unidirectional TVS diode, configured with anode and cathode terminals. The cathode is marked by a band on the DO-214AB package body. It conducts only during reverse overvoltage events on the cathode-connected line, making it ideal for protecting positive DC rails like +75 V supply lines. Unlike bipolar variants (e.g., SMDJ75CA), the SMDJ75A does not conduct in forward bias beyond its VF specification.
Does the SMDJ75A meet automotive transient standards?
Yes, the SMDJ75A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for automotive electrical disturbances. Its 3000 W peak power rating and sub-1 ps response enable effective suppression of load-dump spikes and inductive switching transients. However, system-level validation per ISO 16750-2 is still required, as the SMDJ75A itself is not AEC-Q200 qualified.
What is the maximum steady-state power dissipation for the SMDJ75A?
The SMDJ75A has a steady-state power dissipation (PD) of 6.5 W at 25 °C ambient temperature. This value derates linearly above 25 °C per the thermal derating curve in the datasheet (Fig.2), reaching zero at 175 °C junction temperature. It is not intended for continuous power dissipation but for transient clamping only.
Can the SMDJ75A be used in bidirectional signal line protection?
No, the SMDJ75A is unidirectional and unsuitable for bidirectional signal lines such as RS-485 or CAN. For such applications, the bipolar variant SMDJ75CA must be used instead. Using the SMDJ75A on bidirectional lines risks forward conduction during normal signal swings, causing malfunction or latch-up in connected transceivers.
What is the junction capacitance of the SMDJ75A at zero bias?
The junction capacitance (CJ) of the SMDJ75A is not explicitly specified in the provided documentation. While typical SMDJ-series devices exhibit CJ values in the range of 100–500 pF depending on voltage rating, no measured or guaranteed value is published for the SMDJ75A at 0 V bias or 1 MHz. For high-speed data line protection, consult TSC's application notes or measure CJ empirically.
SMDJ75A 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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 24.8A
- 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)
SMDJ75A FAQ
1.How can I place an order for SMDJ75A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ75A 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 SMDJ75A reliable?
The price and inventory of SMDJ75A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ75A is usually 5 days.
3.What payment methods are accepted for SMDJ75A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ75A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ75A?
SMDJ75A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ75A 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 SMDJ75A?
For technical support, including SMDJ75A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ75A requirements.
6.How does Aetrix verify that SMDJ75A is sourced from the original manufacturer or authorized distributors?
All SMDJ75A 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 SMDJ75A meets industry standards.
7.What is the process for return or replacement of SMDJ75A?
All SMDJ75A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ75A, 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 SMDJ75A part is unused and in its original packaging.
Return procedure for SMDJ75A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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