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Taiwan Semiconductor Corporation SMCJ70H
- Part No.:
- SMCJ70H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70H.pdf
- Description:
- 1500W, 86.5V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:8,086
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Product details
Overview
SMCJ70H 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), 77.8–95.1V breakdown voltage (VBR), and 125V maximum clamping voltage (VC) at 12.6A peak pulse current - designed to protect automotive power rails and industrial I/O interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ70H datasheet, SMCJ70H pinout, SMCJ70H application, or SMCJ70H equivalent, key selection criteria include clamping performance under 10/1000μs surge, AEC-Q101 qualification for automotive use, unidirectional polarity marking, and thermal resistance (RθJA = 55°C/W) for PCB layout thermal management.
Technical Context
The SMCJ70H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (77.8–95.1V at 1mA test current), clamping transients to ≤125V within <1.0ps response time. It sustains 1500W peak pulse power (1ms, 10/1000μs waveform) and exhibits <1μA reverse leakage at 70V.
Designed for automotive-grade reliability, it meets AEC-Q101 stress testing and ISO 7637-2 immunity requirements for load dump and inductive switching events. Its glass-passivated junction and matte tin-plated leads support automated SMT assembly and JESD201 Class 2 whisker resistance.
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 / 95.1 V @ 1 mA - Ensures reliable turn-on margin above VWM with production tolerance |
| VC @ IPPM | 125 V @ 12.6 A - Clamped voltage during 10/1000μs surge; defines protected circuit's max overvoltage exposure |
| PPK | 1500 W - Peak pulse power handling per single 1ms transient per Fig.5 |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance; guides minimum copper area for 150°C max TJ at full power |
| IR @ VWM | <1 μA - Low leakage ensures minimal standby power loss in always-on systems |
| Polarity | Cathode band marked - Unidirectional operation; requires correct orientation in series with protected line |
Pinout & Package
DO-214AB (SMC) surface-mount package: 2-terminal device with cathode band marking on one end; body dimensions 7.11 × 6.22 × 2.39 mm; matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected line (e.g., battery+, signal source) | Connected to upstream power or signal source; carries full surge current into device during clamping |
| Cathode | Ground reference or return path | Marked with band; ties to system ground or low-impedance return; establishes unidirectional conduction path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood and chassis applications per stress test conditions including temperature cycling, HTRB, and ESD |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (capacitive coupling) without degradation |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives; supports 150°C TJ max |
| Fast response time | <1.0 ps rise time enables clamping before sensitive downstream ICs experience overvoltage stress |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow; compatible with standard SMT lines without dry pack handling |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 12V/24V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input stage. Use Value: Limits voltage to ≤125V during 12V ISO 7637-2 Pulse 5a (load dump), preventing damage to LDOs and microcontrollers. | Use Scenario: Shielding 24V digital input channels in programmable logic controllers from field-wiring surges. IC Role / Device Role / Timing Role: Front-end transient suppressor on isolated input optocoupler supply path. Use Value: Clamps induced lightning-induced transients (IEC 61000-4-5 Level 3) to safe levels before reaching isolation barrier. |
| Telecom Line Interface Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Safeguarding RS-485 transceivers connected to outdoor cabling in security systems. IC Role / Device Role / Timing Role: Bidirectional protection not applicable; SMCJ70H used only on DC bias rail feeding transceiver VCC. Use Value: Absorbs coupled energy from nearby AC mains surges, maintaining transceiver VCC within 5% regulation window. | Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart home appliances. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals or H-bridge supply rail. Use Value: Dissipates 1500W peak energy from 200A inductive kick, preventing MOSFET avalanche failure and gate driver latch-up. |
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 (vs. 1500W); SMB package (smaller footprint, higher RθJA = 75°C/W) | Lower energy handling limits use to sub-10A surge environments; unsuitable for ISO 7637-2 Pulse 5a | Select SMCJ70H where full 1500W capability and AEC-Q101 validation are required. |
| 1.5SMC70A | Same 1500W rating and DO-214AB package; manufactured by ON Semiconductor; VBR 77.8–95.1V identical | Functionally identical clamping behavior; differs only in branding, traceability, and minor process variations | Drop-in alternative if dual-sourcing or lead-time constraints require second-source availability. |
Compared with SMBJ70A, SMCJ70H delivers 2.5× higher surge energy capacity and lower thermal resistance for sustained automotive duty cycles; versus 1.5SMC70A, it offers identical electrical performance with Taiwan Semiconductor's AEC-Q101 certification scope and supply chain continuity.
Availability
SMCJ70H is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC input modules, and telecom power rail protection requiring stable component supply and AEC-Q101-compliant surge immunity.
Supply support for SMCJ70H 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 automotive, industrial, and consumer markets since 1979.
The SMCJ series is part of TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for robust transient immunity in harsh automotive and industrial environments with validated ISO 7637-2 compliance.
FAQ
What is the clamping voltage of SMCJ70H at its rated peak pulse current?
The SMCJ70H has a maximum clamping voltage (VC) of 125 V at 12.6 A peak impulse current (IPPM), measured under the standardized 10/1000 μs double-exponential surge waveform per IEC 61000-4-5 and ANSI/IEEE C62.35. This value defines the upper voltage limit imposed on protected circuits during worst-case transient events and is confirmed in the Electrical Specifications table on page 3 of the official SMCJ5.0(A)H–SMCJ170(A)H datasheet revision A2102.
Is SMCJ70H suitable for bidirectional transient suppression?
No, SMCJ70H is a unidirectional TVS diode intended for DC-biased lines only. For bidirectional protection, Taiwan Semiconductor specifies parts with "CH" or "CAH" suffixes (e.g., SMCJ70CH). The SMCJ70H features a cathode band marking and conducts only in reverse breakdown; applying significant forward voltage may exceed its 3.5 V VF rating and cause thermal overstress.
Does SMCJ70H meet AEC-Q101 requirements for automotive use?
Yes, SMCJ70H is explicitly AEC-Q101 qualified per the manufacturer's documentation. This includes passing stress tests for high-temperature reverse bias (HTRB), temperature cycling, humidity bias HAST, and mechanical shock - validating its suitability for under-hood and chassis-mounted automotive electronics where reliability under thermal and vibration stress is critical. Certification applies to the full SMCJxH family, including SMCJ70H.
What is the thermal resistance of SMCJ70H, and how does it affect PCB layout?
The SMCJ70H has a junction-to-ambient thermal resistance (RθJA) of 55°C/W under standard JEDEC test conditions. To maintain junction temperature below 150°C during 1500W transient dissipation, PCB layout must incorporate ≥200 mm² of 2-oz copper connected to both terminals, with thermal vias to inner/ground planes. Insufficient copper area will cause localized overheating and premature failure during repetitive surges.
How does the SMCJ70H compare to SMCJ70AH in terms of breakdown voltage tolerance?
The SMCJ70H has a VBR range of 77.8–95.1 V (min/max), while the SMCJ70AH variant tightens this to 77.8–86.0 V. This narrower tolerance reduces design margin uncertainty in clamping onset but does not alter VWM (70 V), VC (125 V), or PPK (1500 W). Use SMCJ70AH where tighter VBR control is needed for precise threshold alignment; otherwise, SMCJ70H provides broader process yield and cost efficiency without compromising protection integrity.
SMCJ70H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- 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:
- 125V
- Current - Peak Pulse (10/1000µs):
- 12.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ70H FAQ
1.How can I place an order for SMCJ70H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70H 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 SMCJ70H reliable?
The price and inventory of SMCJ70H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ70H is usually 5 days.
3.What payment methods are accepted for SMCJ70H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70H?
SMCJ70H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70H 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 SMCJ70H?
For technical support, including SMCJ70H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70H requirements.
6.How does Aetrix verify that SMCJ70H is sourced from the original manufacturer or authorized distributors?
All SMCJ70H 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 SMCJ70H meets industry standards.
7.What is the process for return or replacement of SMCJ70H?
All SMCJ70H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70H, 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 SMCJ70H part is unused and in its original packaging.
Return procedure for SMCJ70H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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