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Taiwan Semiconductor Corporation SMDJ30A
- Part No.:
- SMDJ30A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ30A.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,824
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Product details
Overview
SMDJ30A from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 30 V working stand-off voltage, 33.3–36.8 V breakdown voltage at 1 mA, 48.4 V maximum clamping voltage at 62 A peak pulse current, and 175 °C maximum junction temperature. It protects power rails and I/O lines in industrial motor drives against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMDJ30A datasheet, SMDJ30A pinout, SMDJ30A application, or SMDJ30A equivalent, key selection criteria include clamping performance under 10/1000 µs surge, thermal resistance (RθJA = 75 °C/W), unidirectional polarity marking, moisture sensitivity level 1 compliance, and DO-214AB footprint compatibility with automated SMT placement.
Technical Context
The SMDJ30A operates as a silicon avalanche diode that enters breakdown when reverse voltage exceeds VBR, diverting surge energy to ground while limiting downstream voltage to ≤48.4 V at 62 A. Its glass-passivated junction ensures stable leakage (<1 µA at 30 V) and fast response (<1.0 ps).
Designed for single-pulse transient suppression per IEC 61000-4-5 and ISO 7637-2, it sustains 3000 W peak pulse power (1 ms) with thermal derating above 25 °C and supports 300 A non-repetitive forward surge (8.3 ms half-sine) - critical for load-switching events in 24/48 V DC systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before leakage rises significantly; sets safe DC rail margin. |
| VBR @ IT=1 mA | 33.3–36.8 V - Measured breakdown range confirming avalanche onset threshold for design margining. |
| VC @ IPPM=62 A | 48.4 V - Clamped voltage during 10/1000 µs surge; defines worst-case stress on protected IC inputs. |
| PPK | 3000 W - Peak pulse power handling per 1 ms waveform; enables robust protection against lightning-induced surges. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; determines required PCB copper area for sustained power dissipation. |
| TJ max | 175 °C - Maximum allowable junction temperature; supports operation in high-ambient industrial enclosures. |
Pinout & Package
DO-214AB (SMC) surface-mount package with cathode band marking for polarity identification. Matte tin-plated leads meet J-STD-002 solderability and JESD 201 Class 2 whisker resistance requirements. Weight: 0.290 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to system ground or low-impedance return path to shunt surge current. |
| Cathode | Protected line input | Connected to line under protection (e.g., 24 V supply rail); marked by band on package body. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage (<1 µA) across temperature and lifetime. |
| ISO 7637-2 compliance | Validated for automotive-grade transients (Pulse 1/2a/2b/3a/3b), enabling use in vehicle ECUs and industrial gateways. |
| Moisture sensitivity level 1 | Eliminates bake requirement prior to reflow; compatible with standard SMT assembly without floor-life constraints. |
| UL 94V-0 molding compound | Prevents flame propagation during fault conditions, meeting safety standards for enclosed power electronics. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of 24 V DC control inputs against inductive kickback from contactor coils and relay switching. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input terminal and chassis ground. Use Value: Limits transient voltage to ≤48.4 V, preventing damage to microcontroller GPIOs rated for 3.3 V or 5 V logic levels. | Use Scenario: Input-stage surge suppression on -48 V telecom rectifier outputs exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC distribution bus upstream of DC-DC converters. Use Value: Absorbs 3000 W peak energy without failure, maintaining bus integrity during 10/1000 µs transients per IEC 61000-4-5. |
| Automotive Body Control Modules | PLC Digital I/O Cards |
Use Scenario: CAN bus power rail protection in BCMs subjected to ISO 7637-2 Pulse 2b (load dump simulation). IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V auxiliary supply feeding CAN transceivers. Use Value: Withstands 300 A 8.3 ms forward surge, ensuring survival during battery disconnection events. | Use Scenario: 24 V digital input protection on programmable logic controller modules interfacing with field sensors. IC Role / Device Role / Timing Role: Line-side transient suppressor mounted directly at connector entry point. Use Value: Delivers <1.0 ps response to ESD events, preserving signal integrity on opto-isolated input channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC30-0.5 | Lower PPK (500 W), higher VC (53 V), DO-214AA (SMB) package | Not suitable for ISO 7637-2 Pulse 1/2a/2b; limited to lower-energy ESD-only scenarios | Select only if board space is constrained and surge energy is below 500 W. |
| 1.5KE30A | Through-hole DO-201 package, same VWM/VC, but RθJA ≈ 50 °C/W and no MSL-1 rating | Requires wave soldering; unsuitable for fully SMT production or high-humidity environments | Choose only for legacy through-hole designs where rework is acceptable and thermal budget allows. |
Compared with SAC30-0.5 and 1.5KE30A, the SMDJ30A delivers 6× higher peak power handling, tighter clamping (48.4 V vs. 53 V), and full SMT manufacturability with MSL-1 compliance - making it the preferred choice for new industrial and automotive designs requiring robust, automated assembly.
Availability
SMDJ30A is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, automotive body control modules, and PLC digital I/O cards requiring stable component supply and long-term lifecycle support.
Supply support for SMDJ30A 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 and automotive markets.
The SMDJ series is designed specifically for high-energy transient suppression in surface-mount power electronics, emphasizing reliability under ISO 7637-2 and IEC 61000-4-5 stress conditions.
FAQ
What is the maximum clamping voltage of the SMDJ30A under surge conditions?
The SMDJ30A has a maximum clamping voltage (VC) of 48.4 V at 62 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during transient events. The SMDJ30A maintains this clamping performance consistently across its specified operating temperature range.
Is the SMDJ30A suitable for bidirectional transient protection?
No, the SMDJ30A is unidirectional. For bidirectional protection, the SMDJ30CA variant must be used. The SMDJ30A features a cathode band marking and is intended for DC line protection where polarity is fixed. Using SMDJ30A in AC or bipolar signal paths risks forward conduction and failure during negative half-cycles.
What is the thermal resistance of the SMDJ30A, and how does it affect PCB layout?
The SMDJ30A has a junction-to-ambient thermal resistance (RθJA) of 75 °C/W. To maintain TJ ≤175 °C under 3000 W peak pulses, adequate copper pour on both sides of the PCB is required - typically ≥250 mm² per pad with thermal vias. Layout must follow the recommended DO-214AB pad dimensions in TSC's datasheet to ensure mechanical reliability and thermal performance.
Does the SMDJ30A meet automotive transient immunity standards?
Yes, the SMDJ30A meets ISO 7637-2 test requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (inductive switch-off), and Pulses 3a/3b (capacitive coupling). Its 3000 W rating and sub-1 ps response make it suitable for protecting 12 V and 24 V automotive subsystems including body control modules and infotainment power rails.
What is the moisture sensitivity level (MSL) rating for the SMDJ30A, and what does it mean for manufacturing?
The SMDJ30A is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and requires no baking prior to reflow soldering. This eliminates moisture-related popcorning risk and simplifies SMT line integration - especially important for high-volume industrial and automotive production where process consistency and yield are critical. The SMDJ30A can be stored and handled under standard ambient conditions.
SMDJ30A 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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 62A
- 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)
SMDJ30A FAQ
1.How can I place an order for SMDJ30A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ30A 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 SMDJ30A reliable?
The price and inventory of SMDJ30A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ30A is usually 5 days.
3.What payment methods are accepted for SMDJ30A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ30A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ30A?
SMDJ30A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ30A 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 SMDJ30A?
For technical support, including SMDJ30A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ30A requirements.
6.How does Aetrix verify that SMDJ30A is sourced from the original manufacturer or authorized distributors?
All SMDJ30A 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 SMDJ30A meets industry standards.
7.What is the process for return or replacement of SMDJ30A?
All SMDJ30A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ30A, 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 SMDJ30A part is unused and in its original packaging.
Return procedure for SMDJ30A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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