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Taiwan Semiconductor Corporation SMDJ17A
- Part No.:
- SMDJ17A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ17A.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,568
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Product details
Overview
SMDJ17A from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode with a 17V working stand-off voltage, 18.9–20.9V breakdown voltage at 1mA test current, and 27.6V maximum clamping voltage at 108.7A 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 SMDJ17A datasheet, SMDJ17A pinout, SMDJ17A application, or SMDJ17A equivalent, key selection criteria include clamping performance under 10/1000μs transients, DO-214AB (SMC) package thermal resistance (RθJA = 75°C/W), unidirectional polarity marking, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b.
Technical Context
The SMDJ17A operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR range (18.9–20.9V) to clamp transient energy into ground. Its glass-passivated junction ensures stable breakdown and low leakage (<5µA at 17V).
With a 3000W peak pulse power rating (tp = 1ms), 175°C maximum junction temperature, and fast response time <1.0ps, it handles high-energy surges from load switching and lightning-induced transients while maintaining reliability in automotive and industrial environments per ISO 7637-2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1mA | 18.9–20.9 V - Verified breakdown threshold ensuring predictable turn-on during transients |
| VC @ IPPM=108.7A | 27.6 V - Clamped voltage limiting downstream IC stress during 10/1000μs surge events |
| PPK | 3000 W - Peak pulse power handling capability per single 1ms transient per Fig.5 |
| RθJA | 75 °C/W - Thermal resistance defining derating above 25°C ambient per Fig.2 |
| Junction temp. range | −55°C to +175°C - Enables operation in extended-temperature industrial and automotive under-hood applications |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional 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 path / Surge return path | Connected to protected line (e.g., 12V rail); conducts during reverse transient to shunt energy |
| Cathode | Clamping reference / Ground connection | Connected to system ground; defines polarity and establishes clamping voltage reference |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable, repeatable breakdown voltage and long-term reliability under repeated surge stress |
| ISO 7637-2 compliance | Validated for automotive load-dump and switching transient immunity (Pulse 1/2a/2b/3a/3b) |
| Fast response time <1.0ps | Enables suppression before sensitive downstream logic or analog circuitry is damaged |
| DO-214AB (SMC) package | Supports automated placement and provides 0.29g mass for mechanical stability on PCBs |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24V digital input channels in programmable logic controllers against inductive kickback and ESD. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between field input and optocoupler input, clamping transients to ≤27.6V. Use Value: Prevents false triggering and latch-up in microcontroller GPIOs by limiting voltage excursion below absolute maximum ratings. | Use Scenario: Safeguarding LIN bus transceiver power supply pins in door module ECUs exposed to battery load dump. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12V supply rail upstream of LDO regulator. Use Value: Absorbs up to 3000W surge energy per ISO 7637-2 Pulse 5a without failure, preserving system uptime. |
| Telecom Power Supply Input | Factory Automation Sensor Interface |
Use Scenario: Front-end protection of AC/DC adapter secondary-side 12V output feeding base station control boards. IC Role / Device Role / Timing Role: Standoff-rated TVS (VWM = 17V) placed after bulk capacitor to suppress conducted surges. Use Value: Maintains <5µA leakage at 17V, minimizing standby power loss while delivering 27.6V clamping during 10/1000μs transients. | Use Scenario: Shielding 4–20mA current loop transmitter inputs from ESD and cable-coupled noise in robotic arms. IC Role / Device Role / Timing Role: Bidirectional-capable layout (with SMDJ17CA variant) but used unidirectionally to protect analog front-end op-amps. Use Value: Leverages 1.0ps response to suppress sub-nanosecond ESD events before op-amp input stage saturation occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC17 | Lower PPK = 1500W; VC = 28.5V @ 52.5A; DO-214AC (SMA) package | Reduced surge margin; suitable only for lower-energy transients or space-constrained layouts | Select SAC17 only if board area is critical and worst-case surge energy remains ≤1500W |
| 1.5SMC17A | Same DO-214AB package; VBR = 18.9–20.9V; VC = 27.6V @ 108.7A; PPK = 1500W | Half the peak power rating limits use in high-energy automotive or industrial environments | Use 1.5SMC17A where cost is prioritized over surge endurance and ISO 7637-2 Pulse 5a compliance is not required |
Compared with SAC17 and 1.5SMC17A, the SMDJ17A delivers double the 3000W peak pulse power in the same DO-214AB footprint, enabling higher system-level surge immunity without PCB redesign-critical for industrial and automotive applications demanding full ISO 7637-2 compliance.
Availability
SMDJ17A is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, telecom power supply inputs, and factory automation sensor interfaces requiring stable component supply across multi-year production cycles.
Supply support for SMDJ17A 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 consumer markets.
The SMDJ series is engineered specifically for high-power transient suppression in harsh environments, emphasizing rugged packaging, ISO 7637-2 compliance, and consistent clamping performance across temperature.
FAQ
What is the maximum clamping voltage of the SMDJ17A under standard test conditions?
The SMDJ17A has a maximum clamping voltage (VC) of 27.6 V when subjected to a 10/1000μs waveform peak pulse current (IPPM) of 108.7 A. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuits during surge events. The SMDJ17A maintains this clamping performance consistently across its specified junction temperature range.
Is the SMDJ17A suitable for bidirectional transient protection?
No, the SMDJ17A is a unidirectional TVS diode intended for DC line protection with defined anode/cathode polarity. For bidirectional applications, the SMDJ17CA variant must be used. The SMDJ17A's cathode band marking and forward voltage specification (VF = 3.5 V @ 100 A) confirm its unidirectional design and prohibit symmetric AC or dual-rail use without external circuitry.
What is the thermal resistance from junction to ambient for the SMDJ17A?
The SMDJ17A has a typical junction-to-ambient thermal resistance (RθJA) of 75°C/W under standard JEDEC PCB mounting conditions. This value governs power derating above 25°C ambient temperature, as shown in Figure 2 of the datasheet. Effective heatsinking or copper pour can improve actual thermal performance beyond this baseline rating.
Does the SMDJ17A meet automotive surge immunity standards?
Yes, the SMDJ17A meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), making it suitable for 12V and 24V automotive subsystems. Its 3000W peak pulse rating and 175°C maximum junction temperature support under-hood and body-control module deployments.
What is the marking code for the SMDJ17A on the device body?
The SMDJ17A is marked with the code "PER" on its package surface. This two-letter alphanumeric code identifies the specific voltage grade within the SMDJ family and is visible adjacent to the cathode band. The marking conforms to Taiwan Semiconductor's standardized SMDJ series coding scheme documented in the ordering information section.
SMDJ17A 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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 108.7A
- 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)
SMDJ17A FAQ
1.How can I place an order for SMDJ17A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ17A 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 SMDJ17A reliable?
The price and inventory of SMDJ17A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ17A is usually 5 days.
3.What payment methods are accepted for SMDJ17A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ17A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ17A?
SMDJ17A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ17A 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 SMDJ17A?
For technical support, including SMDJ17A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ17A requirements.
6.How does Aetrix verify that SMDJ17A is sourced from the original manufacturer or authorized distributors?
All SMDJ17A 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 SMDJ17A meets industry standards.
7.What is the process for return or replacement of SMDJ17A?
All SMDJ17A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ17A, 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 SMDJ17A part is unused and in its original packaging.
Return procedure for SMDJ17A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ17A Tags
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