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Vishay General Semiconductor - Diodes Division SMCJ70A-E3/57T
- Part No.:
- SMCJ70A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70A-E3/57T.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,375
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Product details
Overview
SMCJ70A-E3/57T 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 under surge. It is widely deployed in automotive power supply inputs and industrial sensor interface circuits.
For engineers reviewing the SMCJ70A-E3/57T datasheet, SMCJ70A-E3/57T pinout, SMCJ70A-E3/57T application, or SMCJ70A-E3/57T equivalent, key selection criteria include unidirectional polarity, 1500 W surge rating, 70 V working voltage, RoHS-compliant matte tin terminations, and AEC-Q101 qualification eligibility via HE3 suffix variants - all critical for automotive-grade ESD and load-dump protection design.
Technical Context
The SMCJ70A-E3/57T operates as a silicon avalanche diode with glass-passivated junction, delivering sub-nanosecond response to transients. Its clamping behavior is defined by low incremental surge resistance and stable thermal performance up to TJ = 150 °C, supported by RθJA = 75 °C/W and RθJL = 15 °C/W.
It complies with ANSI/IEEE C62.35 for surge suppression and meets UL 497B recognition (QVGQ2). The device is rated for non-repetitive 10/1000 µs surges on 8.0 mm × 8.0 mm copper pads and is MSL Level 1 compatible (260 °C reflow peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail protection threshold. |
| VBR (min/max) | 77.8 V / 86.0 V at IT = 1 mA - Ensures reliable avalanche initiation within tight tolerance for predictable clamping onset. |
| VC @ IPPM | ≤113 V at IPPM = 13.3 A - Clamped voltage during full 1500 W surge; determines maximum stress on downstream ICs. |
| PPPM | 1500 W (10/1000 µs) - Peak surge energy handling capacity; supports automotive load-dump and ISO 7637-2 Pulse 5a. |
| ID @ VWM | ≤1.0 µA - Ultra-low leakage ensures minimal standby power loss in battery-backed or low-power systems. |
| TJ max. | +150 °C - Enables operation in under-hood automotive environments and high-temperature industrial enclosures. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
Pinout & Package
SMCJ70A-E3/57T uses the SMC (DO-214AB) package: a molded, halogen-free, UL 94 V-0 compliant case with matte tin-plated leads solderable per J-STD-002. Polarity is marked by a cathode band; anode and cathode terminals are located at opposite ends of the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line (e.g., +12 V rail); conducts during overvoltage events to shunt energy to ground. |
| Anode (unmarked end) | Reference/return node | Typically tied to system ground or low-side reference; completes conduction path during transient clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term reliability and stable VBR over temperature and lifetime; eliminates moisture-induced degradation. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping precision and downstream component safety. |
| MSL Level 1 rating | Supports standard SMT reflow without baking or special handling; simplifies manufacturing integration. |
| AEC-Q101 qualification path | HE3 suffix variants are automotive-qualified; enables drop-in use in automotive ECUs, ADAS sensors, and infotainment power stages. |
| UL 497B recognition (QVGQ2) | Validates compliance for telecom and industrial surge protection applications requiring certified safety agency approval. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V power inputs in engine control units (ECUs) against ISO 7637-2 load-dump pulses (up to 60 V, 400 ms) and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and input filter capacitor to clamp transients before they reach DC-DC converters and microcontrollers. Use Value: Limits peak voltage to ≤113 V during 1500 W surges, preventing damage to 36 V-rated input stages and ensuring ASIL-B system continuity. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) in factory-floor pressure/temperature transmitters from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 µA) TVS placed across signal and return lines to absorb ±8 kV contact ESD per IEC 61000-4-2 without affecting loop accuracy. Use Value: Maintains signal integrity with <0.01% full-scale error impact while surviving >10,000 ESD events due to stable VBR and low capacitance. |
| Telecom DC Power Feeds | Consumer Appliance Motor Drive Inputs |
|
Use Scenario: Safeguarding -48 V DC power feeds in remote radio heads and base station backhaul equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional-capable family member (unidirectional variant used with polarity-aware layout) clamping both positive and negative transients on telecom power bus. Use Value: Delivers 1500 W surge capability with ≤113 V clamping, meeting Telcordia GR-1089-CORE Level 3 requirements for central office equipment. |
Use Scenario: Protecting BLDC motor driver inputs in smart washing machines and HVAC systems from commutation spikes and relay bounce. IC Role / Device Role / Timing Role: Mounted directly at motor controller PCB entry point to divert inductive kickback (L·di/dt) away from gate drivers and MCU I/O. Use Value: Withstands 200 A IFSM (8.3 ms half-sine), enabling robust protection against repeated motor startup surges without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC70A-TB-E3 | Same VWM (70 V), lower PPPM (600 W), DO-214AA (SMA) package, smaller footprint but higher RθJA (100 °C/W). | Limited to lower-energy transients (e.g., IEC 61000-4-5 Level 3); unsuitable for automotive load-dump. | Select when board space is constrained and surge energy is ≤600 W; verify thermal margin at 50 °C ambient. |
| 1.5SMC70AHE3_A/H | Identical electrical specs and SMC package; AEC-Q101 qualified, HE3 suffix, same RoHS compliance. | Approved for automotive production; supports PPAP documentation and extended temperature validation (-40 to +150 °C). | Choose for OEM automotive programs requiring qualified components; no layout change needed vs. SMCJ70A-E3/57T. |
Compared with SMCJ70A-E3/57T, SAC70A-TB-E3 trades surge capacity and thermal robustness for compactness, while 1.5SMC70AHE3_A/H delivers identical protection with formal automotive qualification - making it a direct drop-in for safety-critical vehicle systems.
Availability
SMCJ70A-E3/57T is available at Aetrix Electronics and suitable for automotive power input protection, industrial sensor interface hardening, telecom DC feed safeguarding, and consumer appliance motor drive surge suppression requiring stable component supply and traceable sourcing.
Supply support for SMCJ70A-E3/57T 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, efficiency, and application-specific optimization.
The SMCJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against load dump, ESD, and lightning surges is mandatory.
FAQ
What is the maximum clamping voltage of the SMCJ70A-E3/57T under a 1500 W surge?
The SMCJ70A-E3/57T clamps to a maximum of 113 V when subjected to its rated 1500 W peak pulse power (10/1000 µs waveform). This value is measured at IPPM = 13.3 A and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The clamping voltage is guaranteed across the full operating temperature range and is critical for ensuring downstream ICs remain within their absolute maximum ratings. SMCJ70A-E3/57T maintains this performance with low incremental resistance and stable thermal characteristics.
Is the SMCJ70A-E3/57T suitable for automotive applications?
The SMCJ70A-E3/57T is RoHS-compliant and manufactured to commercial-grade specifications; however, Vishay offers the functionally identical 1.5SMC70AHE3_A/H variant with full AEC-Q101 qualification for automotive use. While SMCJ70A-E3/57T shares the same electrical parameters and SMC package, it lacks the extended temperature validation, humidity testing, and PPAP documentation required for Tier 1 automotive production. For non-safety-critical or aftermarket automotive designs, SMCJ70A-E3/57T may be used with engineering validation; for OEM programs, the HE3-suffixed part is mandated. SMCJ70A-E3/57T remains a valid choice for industrial and telecom applications.
What is the thermal resistance of the SMCJ70A-E3/57T, and how does it affect PCB layout?
The SMCJ70A-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W, measured on 8.0 mm × 8.0 mm copper pads per terminal. These values require adequate copper pour area and thermal vias beneath the SMC pad to maintain TJ ≤ 150 °C under sustained 6.5 W power dissipation. Layouts must avoid narrow traces or isolated pads - minimum recommended pad dimensions are 0.31" × 0.31" (8.0 mm × 8.0 mm) per lead. Failure to meet these thermal guidelines risks premature failure during repetitive surge events. SMCJ70A-E3/57T performance is validated only under these mounting conditions.
Does the SMCJ70A-E3/57T have bidirectional capability?
No, the SMCJ70A-E3/57T is a unidirectional transient voltage suppressor, indicated by the "A" suffix and cathode band marking. It conducts only when the cathode is biased positively relative to the anode - protecting against positive-going transients on DC lines referenced to ground. For bidirectional protection (e.g., AC lines or data buses), the SMCJ70CA variant must be used. The "CA" suffix denotes symmetrical breakdown in both polarities, with identical VBR min/max in either direction. SMCJ70A-E3/57T cannot substitute for SMCJ70CA without circuit redesign and polarity verification.
What packaging format is used for the SMCJ70A-E3/57T, and what does "/57T" signify?
The SMCJ70A-E3/57T is supplied in 7-inch diameter plastic tape and reel packaging, with 850 units per reel. The "/57T" suffix explicitly denotes this delivery format per Vishay's ordering nomenclature. The "E3" indicates RoHS-compliant, commercial-grade construction with matte tin-plated leads. This packaging supports high-speed automated assembly and is compatible with standard SMT pick-and-place equipment. Reel dimensions, orientation, and pocket depth conform to EIA-481-D standards. SMCJ70A-E3/57T reels are labeled with full traceability including lot code, date code, and compliance markings.
SMCJ70A-E3/57T 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 (SMCJ)
SMCJ70A-E3/57T FAQ
1.How can I place an order for SMCJ70A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70A-E3/57T 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-E3/57T reliable?
The price and inventory of SMCJ70A-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ70A-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ70A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70A-E3/57T?
SMCJ70A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70A-E3/57T 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-E3/57T?
For technical support, including SMCJ70A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70A-E3/57T requirements.
6.How does Aetrix verify that SMCJ70A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ70A-E3/57T 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-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ70A-E3/57T?
All SMCJ70A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70A-E3/57T, 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-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ70A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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