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Vishay General Semiconductor - Diodes Division SMCJ70A-M3/57T
- Part No.:
- SMCJ70A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70A-M3/57T.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,119
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Product details
Overview
SMCJ70A-M3/57T from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 70 V standoff voltage (VWM), 77.8–86.0 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 μs), 13.3 A peak pulse current (IPPM), and clamps to ≤113 V at rated surge. It is widely deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMCJ70A-M3/57T datasheet, SMCJ70A-M3/57T pinout, SMCJ70A-M3/57T application, or SMCJ70A-M3/57T equivalent, key selection criteria include unidirectional polarity, 1500 W surge rating, 70 V working voltage, thermal resistance (RθJA = 75 °C/W), and halogen-free RoHS compliance per M3 suffix - critical for automotive-grade reliability and PCB assembly compatibility.
Technical Context
The SMCJ70A-M3/57T operates as a clamping-type TVS diode with avalanche breakdown behavior, triggered when reverse voltage exceeds its specified VBR range (77.8–86.0 V). Its low incremental surge resistance ensures minimal voltage overshoot during transient events, while glass-passivated junction enhances long-term stability under repetitive surges.
Designed for unidirectional protection only, it exhibits a forward voltage drop of 3.5 V at 100 A (IF), supports 200 A non-repetitive forward surge (IFSM), and maintains operation across -55 °C to +150 °C junction temperature range. Its SMC package enables automated placement and meets J-STD-020 MSL Level 1 with 260 °C reflow peak.
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 1 mA - guaranteed avalanche onset range for reliable trigger threshold |
| VC @ IPPM | ≤113 V at 13.3 A - clamped voltage during full 1500 W surge, limiting downstream stress |
| PPPM | 1500 W (10/1000 μs) - standardized surge energy handling capability for IEC 61000-4-5 compliance |
| ID @ VWM | ≤1.0 μA - ultra-low leakage preserves system efficiency in standby and low-power modes |
| TJ max. | +150 °C - enables use in under-hood automotive and high-ambient industrial environments |
| RθJA | 75 °C/W - defines thermal derating on standard PCB pads; requires layout-aware heatsinking above 25 °C ambient |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads, polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Protected line connection (anode tied to ground or lower potential) | Reverse-biased during normal operation; conducts only during overvoltage to clamp to safe level |
| Anode | Reference/return path (typically system ground) | Serves as low-impedance sink for surge current; must be routed with low-inductance ground plane |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables single-device protection against severe transients like ISO 7637-2 Pulse 5a (load dump) in 12 V automotive systems |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes voltage overshoot during surge, reducing risk of damage to downstream ICs such as MCUs and CAN transceivers |
| Glass passivated junction | Improves long-term reliability under thermal cycling and humidity exposure, critical for automotive and industrial field life |
| MSL Level 1, 260 °C peak reflow | Supports lead-free SMT assembly without moisture-related popcorning or delamination |
| AEC-Q101 qualification available (HE3/HM3 variants) | Confirms robustness for automotive electronics; SMCJ70A-M3/57T is commercial-grade but shares identical die and package design |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump transients up to 120 V and 400 ms duration. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp surges before LDO or DC-DC converter. Use Value: Limits peak voltage to ≤113 V, preventing overvoltage failure of upstream regulators and microcontrollers. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) in factory automation sensors exposed to ESD and inductive switching noise. IC Role / Device Role / Timing Role: TVS connected across signal and ground to absorb fast-rising transients (<1 ns rise time) before reaching ADC or op-amp input stage. Use Value: Sub-100 ns response time and <1.0 μA leakage preserve signal integrity and measurement accuracy in precision sensing. |
| Telecom DC Power Feeds | Consumer Device USB Power Input |
Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras) from surges induced on 48 V DC input lines during lightning-induced coupling. IC Role / Device Role / Timing Role: Primary clamping device on DC input before isolation transformer or DC-DC controller. Use Value: 1500 W rating handles multi-kV surge events defined in IEC 61000-4-5 Level 4, ensuring system-level immunity certification. | Use Scenario: Guarding USB-C PD input circuits in portable devices against accidental 20 V adapter misconnection or hot-swap transients. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between VBUS and GND to prevent latch-up or gate oxide rupture in USB PD controllers. Use Value: 70 V VWM allows safe operation with 20 V PD profiles while clamping >30 V faults within nanoseconds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A-E3/61 | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), same VWM/VBR range | Not suitable for automotive load dump; limited to low-energy ESD and inductive spikes in space-constrained consumer PCBs | Select when board area is critical and surge energy is ≤400 W; verify thermal margin due to higher thermal resistance. |
| SMCJ70CA-M3/57T | Bidirectional variant (symmetrical VBR), same package, 1500 W rating, no polarity marking | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN bus); unsuitable for DC rail protection where polarity matters | Choose for bidirectional protection needs; note that clamping occurs in both directions and ID is doubled for VWM ≤10 V (not applicable here). |
Compared with SMAJ70A-E3/61 and SMCJ70CA-M3/57T, the SMCJ70A-M3/57T uniquely balances high-energy 1500 W clamping, unidirectional polarity control, and SMC thermal performance - making it optimal for automotive and industrial DC power rail protection where both surge magnitude and thermal reliability are non-negotiable.
Availability
SMCJ70A-M3/57T is available at Aetrix Electronics and suitable for automotive power modules, industrial sensor interfaces, telecom DC feeds, and consumer USB-C PD input stages requiring stable component supply and halogen-free compliance.
Supply support for SMCJ70A-M3/57T 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure applications demanding AEC-Q101 readiness and robust surge immunity.
FAQ
What is the maximum clamping voltage of the SMCJ70A-M3/57T under full-rated surge conditions?
The SMCJ70A-M3/57T clamps to a maximum of 113 V when subjected to its rated 13.3 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is guaranteed per Vishay's datasheet (Document Number: 88394, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during worst-case transients. The SMCJ70A-M3/57T achieves this with low incremental surge resistance, minimizing overshoot beyond the clamping plateau.
Is the SMCJ70A-M3/57T suitable for automotive applications requiring AEC-Q101 qualification?
The SMCJ70A-M3/57T itself is a commercial-grade part (M3 suffix denotes halogen-free RoHS compliance), not AEC-Q101 qualified. However, Vishay offers functionally identical AEC-Q101 variants under ordering codes SMCJ70AHE3_X or SMCJ70AHM3_X (where "_X" is revision letter). The SMCJ70A-M3/57T shares the same die, package, and electrical specs - enabling direct design-in migration to qualified versions when automotive qualification is mandated.
How does the SMCJ70A-M3/57T differ from the bidirectional SMCJ70CA-M3/57T?
The SMCJ70A-M3/57T is unidirectional with cathode band marking and conducts only in reverse breakdown; the SMCJ70CA-M3/57T is bidirectional with symmetrical breakdown in both polarities and no polarity marking. Both share identical VWM (70 V), VBR (77.8–86.0 V), PPPM (1500 W), and SMC package. The SMCJ70A-M3/57T is used on DC rails where polarity is fixed; the CA version is required for AC or differential signal lines like CAN or RS-485.
What is the thermal resistance and how does it affect PCB layout for the SMCJ70A-M3/57T?
The SMCJ70A-M3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the minimum recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad per terminal. This value assumes standard FR-4 PCB with no internal planes. To maintain TJ ≤150 °C under continuous 6.5 W dissipation, designers must either limit average power or increase copper area/thermal vias. The SMCJ70A-M3/57T's thermal performance directly impacts surge repetition rate and long-term reliability in high-ambient environments.
Can the SMCJ70A-M3/57T be used in place of a 70 V Zener diode for voltage regulation?
No - the SMCJ70A-M3/57T is not intended for steady-state voltage regulation. It is a transient suppressor optimized for short-duration, high-energy surges (e.g., 10/1000 μs pulses), with high dynamic impedance outside its clamping region. Its leakage current is specified only at VWM (≤1.0 μA), and it lacks the tight tolerance, low dynamic impedance, and thermal stability required for precision regulation. For regulation, use dedicated Zener or shunt reference ICs; the SMCJ70A-M3/57T serves exclusively as a protective clamp.
SMCJ70A-M3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- 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):
- 13.3A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ70A-M3/57T FAQ
1.How can I place an order for SMCJ70A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70A-M3/57T 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 SMCJ70A-M3/57T reliable?
The price and inventory of SMCJ70A-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ70A-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ70A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70A-M3/57T?
SMCJ70A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70A-M3/57T 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 SMCJ70A-M3/57T?
For technical support, including SMCJ70A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70A-M3/57T requirements.
6.How does Aetrix verify that SMCJ70A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ70A-M3/57T 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 SMCJ70A-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ70A-M3/57T?
All SMCJ70A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70A-M3/57T, 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 SMCJ70A-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ70A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ70A-M3/57T Tags
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