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Taiwan Semiconductor Corporation SMDJ70AH
- Part No.:
- SMDJ70AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ70AH.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,554
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Product details
Overview
SMDJ70AH 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 AEC-Q101 qualified and designed for automotive and industrial surge protection in power supply rails and signal lines.
For engineers reviewing the SMDJ70AH datasheet, SMDJ70AH pinout, SMDJ70AH application, or SMDJ70AH equivalent, key selection criteria include its DO-214AB (SMC) package, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, <1.0ps response time, 175°C max junction temperature, and unidirectional polarity marking.
Technical Context
The SMDJ70AH operates as a unidirectional avalanche diode, clamping transients by entering breakdown when reverse voltage exceeds VBR (77.8–86.0V). Its glass-passivated junction ensures stable leakage (<1µA at 70V) and robust ESD immunity.
It delivers 3000W peak pulse power (10/1000µs waveform), with thermal resistance of 75°C/W (junction-to-ambient) and 15°C/W (junction-to-lead), enabling reliable operation under repetitive surge stress in automotive ECUs and industrial PLC I/O modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1mA | 77.8–86.0 V - Confirmed breakdown threshold ensuring predictable turn-on during transients |
| VC @ IPPM=26.5A | 113 V - Clamping voltage limiting downstream circuit stress during 3000W surge events |
| PPK | 3000 W - Peak pulse power handling per 10/1000µs waveform per Fig.5 |
| TJ max | 175 °C - Enables operation in under-hood automotive environments without derating |
| Response time | <1.0 ps - Sub-picosecond junction response ensures protection before sensitive ICs are damaged |
| Package | DO-214AB (SMC) - Standardized surface-mount outline compatible with automated placement and reflow |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, cathode band marking polarity for unidirectional operation, UL 94V-0 rated compound, and 0.290g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional TVS configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V rail); marked by band; conducts during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage across temperature and lifetime |
| Moisture sensitivity level 1 | No floor life limitation or baking required prior to reflow soldering |
| Halogen-free construction | Complies with IEC 61249-2-21, supporting RoHS and environmental compliance programs |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12V/24V battery-fed control units (e.g., body controllers, lighting modules) from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges above 70V while maintaining normal operation below VWM. Use Value: Limits clamped voltage to 113V during 3000W pulses, preventing damage to downstream DC-DC converters and microcontrollers. | Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) in factory automation systems exposed to relay-induced switching noise. IC Role / Device Role / Timing Role: Low-capacitance TVS on signal line to ground, suppressing fast transients without distorting mV-level signals. Use Value: Sub-1ps response captures nanosecond-scale spikes before they propagate into precision ADC front-ends. |
| Telecom DC Power Input Protection | Motor Drive Gate Driver Supply Clamp |
Use Scenario: Securing -48V telecom rectifier outputs against lightning-induced surges on central office equipment backplanes. IC Role / Device Role / Timing Role: Unidirectional TVS on input rail to chassis ground, sized for long-duration 10/1000µs threats per ITU-T K.20. Use Value: 3000W rating sustains multiple high-energy hits without degradation, extending system field life. | Use Scenario: Clamping bootstrap supply rails in 3-phase inverter gate driver ICs subjected to shoot-through induced voltage spikes. IC Role / Device Role / Timing Role: Fast-acting TVS on isolated 12V gate supply to prevent overvoltage latch-up in driver ICs. Use Value: 113V clamping voltage stays well below typical 150V absolute max ratings of gate drivers like IR2110 or UCC27531. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC70 | Lower peak power (1500W), higher VC (125V @ 13.5A), same DO-214AB package | Not suitable for ISO 7637-2 Pulse 1; limited to lower-energy transients | Select only if system-level surge energy is verified ≤1500W and clamping margin allows 125V |
| 1.5SMC70A | Same VWM/VBR range but lower PPK (1500W), higher VC (125V), non-AEC-Q101 | Lacks automotive qualification and ISO 7637-2 validation; intended for commercial use only | Acceptable for cost-sensitive industrial designs where AEC-Q101 and automotive standards are not required |
Compared with SAC70 and 1.5SMC70A, the SMDJ70AH provides 100% higher peak power rating, 12V lower clamping voltage at rated current, and full AEC-Q101 + ISO 7637-2 certification-making it the only option qualified for under-hood automotive deployment.
Availability
SMDJ70AH is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controller I/O modules, and telecom power entry circuits requiring stable component supply and long-term lifecycle support.
Supply support for SMDJ70AH 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, and rectifiers with global distribution and AEC-Q101 validation capability.
The SMDJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing robust clamping performance, fast response, and process-controlled glass passivation.
FAQ
What is the maximum clamping voltage of the SMDJ70AH under standard test conditions?
The SMDJ70AH has a maximum clamping voltage (VC) of 113 V at 26.5 A peak pulse current (IPPM) using the 10/1000 µs waveform defined in IEC 61000-4-5. This value is measured per the manufacturer's test method and ensures predictable overvoltage limiting for downstream components in the SMDJ70AH protection circuit.
Is the SMDJ70AH suitable for bidirectional transient suppression?
No, the SMDJ70AH is unidirectional. For bidirectional operation, Taiwan Semiconductor offers the SMDJ70CAH variant, which uses a center-tapped dual-die configuration. The SMDJ70AH must be installed with correct polarity-cathode toward the protected line-to function as intended in the SMDJ70AH design.
Does the SMDJ70AH meet automotive qualification standards?
Yes, the SMDJ70AH is AEC-Q101 qualified and explicitly validated to meet ISO 7637-2 test pulses 1, 2a, 2b, 3a, and 3b. These certifications confirm its suitability for use in automotive power networks, including engine control units and body electronics where the SMDJ70AH is deployed.
What is the thermal resistance specification for the SMDJ70AH?
The SMDJ70AH has a junction-to-ambient thermal resistance (RθJA) of 75°C/W and a junction-to-lead thermal resistance (RθJL) of 15°C/W, measured under standard JEDEC PCB mounting conditions. These values directly inform heatsinking requirements and power derating curves for the SMDJ70AH in sustained surge environments.
How is polarity indicated on the SMDJ70AH package?
The SMDJ70AH uses a cathode band marking on the DO-214AB (SMC) case to indicate polarity. This band aligns with the cathode terminal and must face the protected line (e.g., 12V rail) during PCB layout. Incorrect orientation will prevent proper clamping operation of the SMDJ70AH.
SMDJ70AH 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ70AH FAQ
1.How can I place an order for SMDJ70AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ70AH 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 SMDJ70AH reliable?
The price and inventory of SMDJ70AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ70AH is usually 5 days.
3.What payment methods are accepted for SMDJ70AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ70AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ70AH?
SMDJ70AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ70AH 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 SMDJ70AH?
For technical support, including SMDJ70AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ70AH requirements.
6.How does Aetrix verify that SMDJ70AH is sourced from the original manufacturer or authorized distributors?
All SMDJ70AH 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 SMDJ70AH meets industry standards.
7.What is the process for return or replacement of SMDJ70AH?
All SMDJ70AH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ70AH, 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 SMDJ70AH part is unused and in its original packaging.
Return procedure for SMDJ70AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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