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Taiwan Semiconductor Corporation SMDJ24A
- Part No.:
- SMDJ24A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ24A.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,958
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Product details
Overview
SMDJ24A from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 24V working stand-off voltage (VWM), 26.7–29.5V breakdown voltage (VBR), and 38.9V maximum clamping voltage (VC) at 77.1A peak pulse current. It protects telecom and industrial power rails against ESD, lightning-induced transients, and load-switching surges.
For engineers reviewing the SMDJ24A datasheet, SMDJ24A pinout, SMDJ24A application, or SMDJ24A 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 SMDJ24A operates as a single-die, unidirectional avalanche diode optimized for high-energy transient suppression in DC power lines. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1µA @ 24V), while its 175°C max junction temperature supports operation in thermally constrained SMT environments.
Designed for fast response (<1.0ps), it delivers consistent clamping during sub-microsecond transients without degradation across its rated lifetime. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity, enabling robust reflow compatibility in automated assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 26.7 V / 29.5 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 38.9 V - Clamped voltage at 77.1 A peak pulse current (10/1000 µs waveform), limiting downstream stress |
| PPK | 3000 W - Peak pulse power handling capability, critical for lightning surge immunity per IEC 61000-4-5 |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance determines derating above 25°C ambient |
| TJ max | 175 °C - Maximum allowable junction temperature, enabling use in high-temperature industrial enclosures |
| IR @ VWM | <1 µA - Reverse leakage at 24 V ensures minimal standby power loss in battery-backed systems |
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 | Input side of protected line | Connected to power rail or signal line requiring transient protection |
| Cathode | Ground reference side | Connected to system ground or low-impedance return path; marked by band on package |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR over temperature and lifetime, minimizing parameter drift in automotive-grade applications |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching noise) |
| Fast response time <1.0 ps | Enables effective suppression of nanosecond-scale ESD events before sensitive ICs are damaged |
| J-STD-020 Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profiles without baking preconditioning |
Applications
| Telecom Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: 24V DC input stage of VoIP gateway exposed to induced surges from nearby AC wiring and lightning coupling. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and chassis ground to shunt transients before reaching DC-DC converter. Use Value: Limits clamped voltage to 38.9V, keeping downstream 40V-rated input capacitors and regulators within safe operating area. | Use Scenario: 24V digital input module in programmable logic controller subjected to relay coil flyback and field-wiring ESD. IC Role / Device Role / Timing Role: Primary overvoltage protector on each isolated input channel, mounted adjacent to connector. Use Value: Withstands 3000W pulses per IEC 61000-4-5 Level 4, preventing latch-up or damage to optocoupler input stages. |
| Automotive Body Control Module (BCM) Supply Rail | Factory Automation Sensor Interface |
Use Scenario: 24V supply line in BCM exposed to load-dump transients up to 35V for 400ms per ISO 16750-2. IC Role / Device Role / Timing Role: Secondary clamping device downstream of primary load-dump suppressor, handling residual spikes. Use Value: Delivers 77.1A peak current capacity and 38.9V clamping to protect 3.3V/5V LDOs and microcontroller IOs. | Use Scenario: 24V two-wire sensor loop (e.g., proximity switch) routed alongside motor drives in CNC machinery. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional SMDJ24A placed across sensor power and return to suppress common-mode surges. Use Value: Low 1µA leakage preserves sensor accuracy, while 3000W rating handles repetitive switching noise without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC24 | Lower PPK (1500W), higher VC (43.0V @ 35A), same DO-214AB package | Not suitable for ISO 7637-2 Pulse 1 or lightning-level surges; limited to lower-energy ESD | Select SMDJ24A when 3000W surge immunity and sub-40V clamping are mandatory |
| SMCJ24A | Identical electrical specs and DO-214AB package; manufactured by Vishay, compliant with AEC-Q200 Grade 1 | Preferred for automotive applications requiring qualification traceability and extended temperature validation | Choose SMCJ24A if AEC-Q200 qualification and automotive PPAP support are required |
Compared with SAC24 and SMCJ24A, the SMDJ24A offers the optimal balance of high-power surge handling (3000W), tight clamping (38.9V), and industrial-grade reliability without automotive qualification overhead-making it ideal for cost-sensitive telecom and factory automation designs where ISO 7637-2 compliance is essential but AEC-Q200 is not mandated.
Availability
SMDJ24A is available at Aetrix Electronics and suitable for telecom power input protection, industrial PLC digital I/O protection, automotive body control module supply rail conditioning, and factory automation sensor interface applications requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMDJ24A 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The SMDJ series was developed specifically for high-reliability, surface-mount transient suppression in industrial and transportation systems where robustness against repetitive 3000W surges and strict ISO 7637-2 compliance are required.
FAQ
What is the maximum clamping voltage of the SMDJ24A under standard test conditions?
The SMDJ24A has a maximum clamping voltage (VC) of 38.9 V when subjected to a 10/1000 µs waveform peak pulse current (IPPM) of 77.1 A. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during surge events. The SMDJ24A maintains this clamping performance consistently across its operational temperature range, making it suitable for 24V system protection where downstream components have ≤40V absolute maximum ratings.
Is the SMDJ24A suitable for bidirectional transient suppression?
No, the SMDJ24A is a unidirectional TVS diode intended for DC line protection with defined anode and cathode terminals. For bidirectional applications, the SMDJ24CA variant must be used-it features symmetrical breakdown in both directions and is marked with "DEZ" code. Using the SMDJ24A in reverse-biased AC or bipolar signal paths will result in forward conduction and potential failure. Always verify polarity marking (cathode band) during PCB layout for the SMDJ24A.
What is the thermal resistance and how does it affect SMDJ24A derating?
The SMDJ24A has a junction-to-ambient thermal resistance (RθJA) of 75°C/W. This means that for every watt of average power dissipated, the junction temperature rises 75°C above ambient. Since the SMDJ24A is rated for pulsed operation-not steady-state-the RθJA governs derating of peak power above 25°C ambient per Figure 2 in the datasheet. At 85°C ambient, the 3000W PPK rating reduces to approximately 2100W to maintain TJ ≤ 175°C.
Does the SMDJ24A meet automotive transient immunity standards?
Yes, the SMDJ24A meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (switching noise), making it suitable for non-safety-critical automotive subsystems like body control modules and infotainment power supplies. However, it is not AEC-Q200 qualified. For automotive applications requiring formal qualification, consider the functionally equivalent SMCJ24A from Vishay, which carries AEC-Q200 Grade 1 certification.
What packaging and moisture sensitivity level does the SMDJ24A have?
The SMDJ24A is supplied in DO-214AB (SMC) package on 3,000-piece tape-and-reel format. It complies with J-STD-020 Moisture Sensitivity Level 1, meaning it has unlimited floor life and can undergo standard lead-free reflow profiles (e.g., JEDEC J-STD-020) without pre-baking. The matte tin-plated leads ensure solderability per J-STD-002, and the UL 94V-0 molding compound provides flame resistance in high-density layouts.
SMDJ24A 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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 77.1A
- 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)
SMDJ24A FAQ
1.How can I place an order for SMDJ24A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ24A 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 SMDJ24A reliable?
The price and inventory of SMDJ24A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ24A is usually 5 days.
3.What payment methods are accepted for SMDJ24A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ24A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ24A?
SMDJ24A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ24A 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 SMDJ24A?
For technical support, including SMDJ24A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ24A requirements.
6.How does Aetrix verify that SMDJ24A is sourced from the original manufacturer or authorized distributors?
All SMDJ24A 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 SMDJ24A meets industry standards.
7.What is the process for return or replacement of SMDJ24A?
All SMDJ24A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ24A, 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 SMDJ24A part is unused and in its original packaging.
Return procedure for SMDJ24A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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