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Taiwan Semiconductor Corporation SMDJ70A
- Part No.:
- SMDJ70A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ70A.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,671
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Product details
Overview
SMDJ70A from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode with a 70V working stand-off voltage, 77.8–86.0V breakdown voltage at 1mA test current, and 113V maximum clamping voltage at 26.5A peak pulse current. It is designed for robust ESD and surge protection in DC power rails of industrial control systems, automotive electronics, and telecom infrastructure.
For engineers reviewing the SMDJ70A datasheet, SMDJ70A pinout, SMDJ70A application, or SMDJ70A equivalent, key selection criteria include its DO-214AB (SMC) package compatibility, 175°C junction temperature rating, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The SMDJ70A operates as a single-die, unidirectional avalanche diode optimized for high-energy transients. Its clamping behavior is defined by a 113V VC at IPPM = 26.5A under 10/1000μs waveform, with thermal resistance RθJA = 75°C/W and RθJL = 15°C/W enabling reliable operation up to 175°C junction temperature.
It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, supporting lead-free reflow assembly without preconditioning. The device exhibits <5μA reverse leakage at 70V and forward voltage of 3.5V at 100A - consistent with SMDJ10A–SMDJ90A unidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 77.8 V / 86.0 V at IT = 1 mA - Ensures predictable avalanche onset across production lot |
| VC @ IPPM | 113 V at 26.5 A - Limits downstream voltage stress during 10/1000μs surges |
| PPK | 3000 W - Peak pulse power handling per single non-repetitive event |
| TJ max | +175 °C - Enables use in high-ambient environments like engine compartments or enclosed industrial enclosures |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 7.11 mm x 6.22 mm footprint and cathode band marking |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, UL 94V-0 rated compound, polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., +70V rail); cathode band marks this terminal on PCB silkscreen |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR over lifetime and improved humidity resistance vs. non-passivated alternatives |
| ISO 7637-2 compliance | Validated for automotive load-dump and switching transient immunity (Pulse 1/2a/2b/3a/3b) |
| Sub-1 ps response time | Clamps ESD events before sensitive ICs experience overstress - critical for USB, CAN, and sensor interfaces |
| J-STD-020 MSL Level 1 | Zero floor life limitation - can be mounted directly from reel without baking or dry-pack requirements |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and microcontroller I/O against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Unidirectional TVS placed between MCU GPIO and relay coil return path to clamp negative transients. Use Value: Withstands 3000W pulses while limiting voltage to ≤113V, preventing latch-up or permanent damage to 3.3V/5V logic inputs. | Use Scenario: Safeguarding LIN bus transceivers and power supply inputs against battery disconnect spikes and alternator load dump. IC Role / Device Role / Timing Role: Primary clamping device on 12V rail upstream of LDO regulators and communication ICs. Use Value: Meets ISO 7637-2 Pulse 5a (load dump) requirements with 113V clamping, keeping downstream 24V-rated components within safe margin. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: Surge suppression on -48V DC distribution lines feeding base station radios and remote radio units. IC Role / Device Role / Timing Role: Standoff-rated TVS on input stage of DC-DC converters handling telecom-grade power delivery. Use Value: 70V VWM matches nominal -48V system with 20% tolerance; 113V VC ensures converter primary-side MOSFETs remain below 200V VDS rating. | Use Scenario: Input-stage protection for PV string combiner boxes exposed to lightning-induced surges on DC strings. IC Role / Device Role / Timing Role: First-line clamping element on each string before MPPT controller input. Use Value: 3000W PPK rating handles multi-kA induced surges; DO-214AB package supports automated placement in high-volume solar manufacturing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70A (Bourns) | Same DO-214AA (SMB) package; 3000W rating but lower PPK derating above 75°C due to higher RθJA (~90°C/W) | Less suitable for high-ambient industrial enclosures where SMDJ70A's 75°C/W thermal resistance provides better margin | Select SMDJ70A when board space allows DO-214AB and ambient exceeds 75°C |
| 1.5SMC70A (ON Semiconductor) | Identical DO-214AB (SMC) package and 3000W rating; VBR min/max = 77.8–86.0V same as SMDJ70A, but IR@VWM = 10µA (vs. 1µA for SMDJ70A) | Higher leakage may affect ultra-low-power standby circuits; otherwise functionally interchangeable in most DC rail protection | Prefer SMDJ70A for battery-backed or energy-harvesting systems requiring <5µA leakage |
Compared with SMBJ70A and 1.5SMC70A, the SMDJ70A offers superior thermal performance (RθJA = 75°C/W), tighter leakage specification (1µA), and full ISO 7637-2 validation - making it optimal for automotive and high-reliability industrial deployments where long-term stability and surge margin are critical.
Availability
SMDJ70A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, RoHS-compliant packaging, and traceable sourcing for production programs.
Supply support for SMDJ70A 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, serving global industrial, automotive, and consumer markets since 1979.
The SMDJ series belongs to TSC's high-power TVS portfolio, engineered specifically for robust transient immunity in harsh electromagnetic environments - emphasizing low clamping ratio, repeatable breakdown, and AEC-Q200-aligned reliability testing.
FAQ
What is the maximum clamping voltage of the SMDJ70A under standard test conditions?
The SMDJ70A has a maximum clamping voltage (VC) of 113 V at a peak pulse current (IPPM) of 26.5 A, measured using the 10/1000 μs waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events. The SMDJ70A maintains this clamping performance consistently due to its glass-passivated junction and tight VBR tolerance.
Is the SMDJ70A suitable for bidirectional transient protection?
No, the SMDJ70A is a unidirectional TVS diode intended only for DC line protection with defined polarity. For bidirectional applications such as AC lines or data buses, the SMDJ70CA variant must be used instead. The SMDJ70A features a cathode band marking and exhibits forward conduction behavior - using it in reverse-biased AC configurations risks failure. Always verify polarity alignment during PCB layout for the SMDJ70A.
Does the SMDJ70A meet automotive surge immunity standards?
Yes, the SMDJ70A 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 automotive body electronics and infotainment power supplies. It is not AEC-Q200 qualified out-of-box, but its construction, thermal specs, and test validation align with Tier 2 supplier requirements when supported by system-level qualification. Confirm full AEC-Q200 status with Taiwan Semiconductor for safety-critical applications.
What is the moisture sensitivity level (MSL) rating for the SMDJ70A?
The SMDJ70A is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and can be mounted directly from tape-and-reel packaging without baking, dry-pack, or humidity exposure controls. This simplifies SMT line integration and reduces manufacturing overhead compared to MSL Level 2 or higher devices. The DO-214AB (SMC) molding compound and matte tin plating contribute to this robust moisture resistance.
How does the SMDJ70A compare to the SMBJ70A in terms of thermal performance?
The SMDJ70A offers significantly better thermal performance than the SMBJ70A, with a junction-to-ambient thermal resistance (RθJA) of 75°C/W versus ~90°C/W for the SMBJ70A. This 15°C/W improvement enables higher sustained power dissipation in compact layouts and elevated ambient temperatures. The SMDJ70A's lower RθJA stems from its larger DO-214AB (SMC) package footprint and optimized leadframe design - a key differentiator when designing for industrial or automotive under-hood applications where thermal headroom is constrained.
SMDJ70A 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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 26.5A
- 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)
SMDJ70A FAQ
1.How can I place an order for SMDJ70A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ70A 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 SMDJ70A reliable?
The price and inventory of SMDJ70A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ70A is usually 5 days.
3.What payment methods are accepted for SMDJ70A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ70A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ70A?
SMDJ70A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ70A 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 SMDJ70A?
For technical support, including SMDJ70A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ70A requirements.
6.How does Aetrix verify that SMDJ70A is sourced from the original manufacturer or authorized distributors?
All SMDJ70A 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 SMDJ70A meets industry standards.
7.What is the process for return or replacement of SMDJ70A?
All SMDJ70A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ70A, 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 SMDJ70A part is unused and in its original packaging.
Return procedure for SMDJ70A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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