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Taiwan Semiconductor Corporation SMDJ15A
- Part No.:
- SMDJ15A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ15A.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,282
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Product details
Overview
SMDJ15A from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode with a 15V working stand-off voltage, 16.7–18.5V breakdown voltage at 1mA, and 24.4V maximum clamping voltage at 123A peak pulse current. It is designed for primary-level surge protection in DC power rails and signal lines of industrial control systems, automotive ECUs, and telecom interfaces.
For engineers reviewing the SMDJ15A datasheet, SMDJ15A pinout, SMDJ15A application, or SMDJ15A equivalent, key selection criteria include its DO-214AB (SMC) package compatibility, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, 175°C junction rating, and verified clamping performance under 10/1000μs transients.
Technical Context
The SMDJ15A operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve stable reverse breakdown and low dynamic impedance during transient events. Its clamping behavior is characterized by a fixed 24.4V VC at IPPM = 123A under standardized 10/1000μs waveform conditions.
Thermally, it features RθJA = 75°C/W and RθJL = 15°C/W, enabling reliable operation up to 175°C junction temperature. It meets J-STD-020 moisture sensitivity level 1 and JESD 201 class 2 whisker resistance, supporting lead-free reflow assembly without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before leakage exceeds 5 µA |
| VBR @ IT=1mA | 16.7–18.5 V - Confirmed breakdown threshold defining turn-on precision for surge initiation |
| VC @ IPPM=123A | 24.4 V - Clamped voltage limiting downstream circuit stress during worst-case 3000W transient |
| PPK | 3000 W - Peak pulse power handling per single 10/1000μs surge, non-repetitive |
| TJ max | 175 °C - Maximum junction temperature enabling use in high-ambient industrial environments |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 7.11 × 6.22 mm footprint and cathode band marking |
| Response time | <1.0 ps - Sub-picosecond junction response ensures suppression before ESD or lightning-induced edges propagate |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band on unidirectional devices. Weight ≈ 0.290 g. UL 94V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V rail); conducts when voltage exceeds VBR, shunting surge to anode |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| ISO 7637-2 compliance | Validated immunity to automotive load-dump and inductive-switching transients (Pulse 1/2a/2b/3a/3b) |
| Level 1 moisture sensitivity | Enables standard SMT reflow without baking or special handling per J-STD-020 |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS directives for environmentally constrained applications |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 24V DC input rails against inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Unidirectional TVS placed between rail and chassis ground to clamp transients ≤100V within 1µs. Use Value: Limits voltage excursion to 24.4V during 123A surges, preventing damage to upstream DC-DC controllers and microcontrollers. | Use Scenario: Safeguarding LIN bus transceivers and sensor inputs from battery dump and alternator ripple. IC Role / Device Role / Timing Role: Primary surge clamp on 12V supply line, coordinated with secondary RC filtering. Use Value: Meets ISO 7637-2 Pulse 2b (load dump) requirements with <1ps response, preserving signal integrity. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: Input-stage protection for PoE-powered remote units exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-line TVS on 48V DC feed, sized to absorb 3000W pulses without thermal runaway. Use Value: Clamps 10/1000μs surges to 24.4V while maintaining 15V nominal operation-no false triggering. | Use Scenario: DC-link overvoltage suppression in solar string inverters subjected to grid switching transients. IC Role / Device Role / Timing Role: Parallel-mounted TVS across 600V+ DC bus to limit transient overshoot during IGBT commutation faults. Use Value: Withstands 175°C junction temperature and delivers repeatable clamping after multiple 3000W events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ15A | Same DO-214AC (SMA) package; 24.4V VC @ 123A; slightly higher IR (10 µA vs. 5 µA) | Lower power rating (400W vs. 3000W); suitable only for secondary/signal-level protection | Select SMAJ15A only for low-energy ESD where board space limits SMC footprint |
| ON Semiconductor 1.5SMC15A | Identical DO-214AB (SMC) package and 3000W rating; VBR min 16.7V, same VC 24.4V | Same ISO 7637-2 compliance; differs in JEDEC qualification and traceability documentation | 1.5SMC15A offers alternate supply chain with identical electrical and mechanical specs for drop-in replacement |
Compared with SMDJ15A, SMAJ15A serves lower-power roles due to its 400W limit and smaller SMA package, while 1.5SMC15A matches all critical parameters and can be used interchangeably in high-energy industrial and automotive designs requiring full 3000W capability.
Availability
SMDJ15A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power feeds, and renewable energy inverters requiring stable component supply across multi-year production cycles.
Supply support for SMDJ15A 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, and power MOSFETs since 1979.
The SMDJ series was developed specifically for high-reliability, high-power transient suppression in harsh-environment applications including automotive, industrial automation, and telecom infrastructure.
FAQ
What is the maximum clamping voltage of the SMDJ15A under standard test conditions?
The SMDJ15A has a maximum clamping voltage (VC) of 24.4 V when subjected to a 10/1000 μs waveform with a peak pulse current (IPPM) of 123 A. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuits during worst-case transients. The SMDJ15A maintains this clamping performance consistently across its qualified operating temperature range.
Is the SMDJ15A suitable for bidirectional transient protection?
No, the SMDJ15A is a unidirectional TVS diode intended for DC rail protection where polarity is fixed. For bidirectional applications such as AC lines or data buses, the SMDJ15CA variant must be used. The SMDJ15A's cathode band marking and forward voltage specification (VF = 3.5 V at 100 A) confirm its unidirectional design and functionality.
What is the thermal resistance from junction to ambient for the SMDJ15A?
The SMDJ15A has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on a standard FR-4 PCB with minimum copper area. This value assumes natural convection cooling and is critical for calculating safe power derating above 25°C ambient. The device also specifies RθJL = 15 °C/W for lead-to-junction conduction paths.
Does the SMDJ15A meet automotive surge immunity standards?
Yes, the SMDJ15A meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (inductive switch-off), Pulse 3a (capacitive discharge), and Pulse 3b (capacitive discharge with line impedance). Its 3000W rating and sub-1ps response enable robust protection in automotive body control modules and infotainment power supplies.
What is the moisture sensitivity level (MSL) of the SMDJ15A and how does it affect assembly?
The SMDJ15A is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/60% RH and subjected to standard lead-free reflow profiles without pre-baking. This eliminates moisture-related popcorning risk and simplifies SMT line integration-no dry pack or floor life tracking is required for the SMDJ15A.
SMDJ15A 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 123A
- 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)
SMDJ15A FAQ
1.How can I place an order for SMDJ15A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ15A 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 SMDJ15A reliable?
The price and inventory of SMDJ15A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ15A is usually 5 days.
3.What payment methods are accepted for SMDJ15A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ15A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ15A?
SMDJ15A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ15A 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 SMDJ15A?
For technical support, including SMDJ15A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ15A requirements.
6.How does Aetrix verify that SMDJ15A is sourced from the original manufacturer or authorized distributors?
All SMDJ15A 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 SMDJ15A meets industry standards.
7.What is the process for return or replacement of SMDJ15A?
All SMDJ15A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ15A, 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 SMDJ15A part is unused and in its original packaging.
Return procedure for SMDJ15A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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