My Inquiry
My Account
Taiwan Semiconductor Corporation SMCJ70A
- Part No.:
- SMCJ70A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70A.pdf
- Description:
- TVS DIODE 70VWM 113VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:1,270
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ70A from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 70V working stand-off voltage (VWM), 77.8–86V breakdown voltage (VBR), and 113V maximum clamping voltage (VC) at 13.9A peak pulse current-designed for automotive load-dump and inductive switching protection in power supply rails.
For engineers reviewing the SMCJ70A datasheet, SMCJ70A pinout, SMCJ70A application, or SMCJ70A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature limits up to +150°C, moisture sensitivity level 1 compliance, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The SMCJ70A operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR range (77.8–86V @ IT = 1mA), limiting transient energy via low-impedance conduction while maintaining <1μA leakage at 70V. Its glass-passivated junction ensures stable breakdown and fast response (<1.0ps rise time).
Thermally, it features RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable operation at TJ up to +150°C. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards for high-reliability industrial and automotive PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 77.8 V / 86 V @ 1 mA - Confirmed avalanche initiation range for robust overvoltage margin |
| VC @ IPPM | 113 V @ 13.9 A - Clamped voltage during 10/1000μs surge, limiting downstream IC stress |
| PPK | 1500 W - Peak pulse power handling per single 1ms transient per Fig.5 waveform |
| IR @ VWM | <1 μA - Negligible leakage at rated stand-off, preserving low-power system quiescent current |
| TJ max | +150 °C - Enables placement near heat sources (e.g., power MOSFETs, DC-DC converters) |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with cathode band marking and 0.210g mass |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, cathode band indicating terminal polarity; compliant with J-STD-002 solderability and J-STD-020 MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path (cathode-banded side is cathode) | Connected to ground or low-impedance return path; defines unidirectional clamping direction |
| Cathode | Transient voltage reference node | Connected to protected line (e.g., 12V rail); conducts avalanche current to ground during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Fast response time | <1.0 ps from 0 V to VBR min - Ensures clamping activation before sensitive logic or analog circuitry sustains damage |
| Glass passivated junction | Stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 12V battery-fed ECU power input subjected to load-dump transients up to 120V per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between rail and chassis ground, absorbing >1500W surge energy within microseconds. Use Value: Limits rail voltage to ≤113V during 35V–120V transients, protecting downstream DC-DC controllers and microcontrollers without derating. | Use Scenario: 24V digital input channel on programmable logic controller exposed to relay coil flyback and EFT bursts. IC Role / Device Role / Timing Role: Front-end transient suppressor on signal line, shunting induced spikes before optocoupler or Schmitt trigger input stage. Use Value: Maintains <1μA leakage at 24V nominal, avoiding false triggering; clamps 4kV EFT pulses to safe levels per IEC 61000-4-4. |
| LED Driver Overvoltage Clamp | Telecom DC Feed Protection |
Use Scenario: Constant-current LED driver board powered from 48V PoE-derived supply, vulnerable to hot-swap surges and cable discharge events. IC Role / Device Role / Timing Role: Rail-to-ground TVS on output stage, activated only during overvoltage, remaining high-impedance during normal operation. Use Value: Withstands 1500W peak pulses while adding zero insertion loss or capacitance impact on PWM dimming signals. | Use Scenario: Central office line card receiving -48V DC feed over long copper pairs subject to lightning-induced surges. IC Role / Device Role / Timing Role: Primary protection device on feed input, coordinated with gas discharge tube (GDT) secondary stage. Use Value: Fast <1ps response captures initial surge edge; 113V clamping prevents damage to upstream DC/DC and monitoring ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70A | 600W rating, same VWM/VBR/VC but lower IPPM (7.5A vs. 13.9A), SMB package (smaller footprint, higher RθJA) | Suitable for space-constrained consumer electronics with lower-energy transients; not recommended for automotive load-dump | Select SMCJ70A when 1500W surge immunity and automotive-grade thermal performance are required. |
| 1.5KE70A | Through-hole DO-201 package, identical electrical specs (VWM=70V, VC=113V), but slower response (~1ns) and no MSL Level 1 rating | Legacy designs requiring through-hole assembly or where automated SMT placement is unavailable | Choose SMCJ70A for new SMT designs needing J-STD-020 compliance and superior thermal dissipation. |
Compared with SMBJ70A and 1.5KE70A, the SMCJ70A delivers 2.5× higher peak power handling in an SMT-optimized package with certified moisture resistance and faster response-making it the preferred choice for next-generation automotive and industrial power interfaces.
Availability
SMCJ70A is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, LED drivers, and telecom power feeds requiring stable component supply across extended temperature and surge environments.
Supply support for SMCJ70A 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, specializing in high-reliability protection devices, rectifiers, and power management components.
The SMCJ series belongs to TSC's transient voltage suppressor product line, engineered specifically for ISO 7637-2-compliant automotive and industrial surge immunity-emphasizing robust clamping, low leakage, and MSL Level 1 manufacturability.
FAQ
What is the polarity configuration of the SMCJ70A?
The SMCJ70A is a unidirectional TVS diode, with cathode indicated by a band on the DO-214AB (SMC) package body. It conducts only when the cathode is biased positive relative to the anode-making it suitable for DC rail clamping where polarity is fixed. This differs from bidirectional variants (e.g., SMCJ70CA), which suppress transients in both directions.
Does the SMCJ70A meet automotive qualification standards?
Yes, the SMCJ70A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for automotive electrical disturbances. While not AEC-Q200 qualified itself, its electrical performance, thermal rating (TJ max = +150°C), and construction (glass-passivated junction, MSL Level 1) align with Tier-1 automotive subsystem design practices for non-safety-critical power rail protection.
What is the maximum clamping voltage of the SMCJ70A under surge conditions?
The SMCJ70A has a maximum clamping voltage (VC) of 113 V at 13.9 A peak pulse current (IPPM), measured using the standard 10/1000μs double-exponential waveform per Fig.5. This value is guaranteed across the full operating temperature range and ensures downstream components see no more than 113 V during worst-case transients.
Can the SMCJ70A be used in bidirectional signal lines?
No-the SMCJ70A is strictly unidirectional and must not be used on AC or bidirectional signal paths. For such applications, select the bidirectional variant SMCJ70CA, which provides symmetrical clamping in both polarities. Using SMCJ70A on a bidirectional line risks forward conduction during negative half-cycles and potential device failure.
What is the leakage current specification for the SMCJ70A at its rated stand-off voltage?
The SMCJ70A exhibits maximum reverse leakage current (IR) of less than 1 μA when biased at its 70 V working stand-off voltage (VWM) and tested at TA = 25°C. This ultra-low leakage preserves system efficiency in always-on circuits and avoids false triggering in high-impedance sensing nodes.
SMCJ70A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- 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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ70A FAQ
1.How can I place an order for SMCJ70A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70A 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 reliable?
The price and inventory of SMCJ70A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ70A is usually 5 days.
3.What payment methods are accepted for SMCJ70A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70A?
SMCJ70A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70A 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?
For technical support, including SMCJ70A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70A requirements.
6.How does Aetrix verify that SMCJ70A is sourced from the original manufacturer or authorized distributors?
All SMCJ70A 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 meets industry standards.
7.What is the process for return or replacement of SMCJ70A?
All SMCJ70A units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70A, 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 part is unused and in its original packaging.
Return procedure for SMCJ70A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ70A Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
