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Vishay General Semiconductor - Diodes Division SMCJ70CAHM3/H
- Part No.:
- SMCJ70CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ70CAHM3/H.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,465
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Product details
Overview
SMCJ70CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 70 V standoff voltage (VWM), 1500 W peak pulse power (PPPM), and clamps transients to ≤113 V at 13.3 A (10/1000 μs waveform), with AEC-Q101 qualification for automotive applications.
For engineers reviewing the SMCJ70CAHM3/H datasheet, SMCJ70CAHM3/H pinout, SMCJ70CAHM3/H application, or SMCJ70CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, 1500 W surge rating, -55 °C to +150 °C operating junction temperature, halogen-free RoHS compliance, and automotive-grade reliability per AEC-Q101.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal lines without polarity concerns. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at VWM), while the low incremental surge resistance supports fast, repeatable clamping under repetitive transient events.
The device is rated for 1500 W peak pulse power with a 10/1000 μs waveform and exhibits a typical thermal resistance of 75 °C/W (junction-to-ambient) on standard 8.0 mm × 8.0 mm copper pads. Its breakdown voltage range is 77.8 V to 86.0 V at 1 mA test current, with a temperature coefficient of 0.105 %/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for protected circuitry. |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | ≤113 V at 13.3 A - Clamped voltage under full-rated 10/1000 μs surge; determines maximum stress imposed on downstream components. |
| PPPM | 1500 W - Peak transient energy handling capacity; enables protection against high-energy surges like ISO 7637-2 Pulse 1/2a/5a. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures. |
| Package | SMC (DO-214AB) - Surface-mount outline with 2.06 mm minimum cathode band width; compatible with automated placement and reflow soldering. |
| AEC-Q101 | Qualified - Validated for automotive use including temperature cycling, HTRB, and ESD testing; supports ASIL-B system-level designs. |
Pinout & Package
SMCJ70CAHM3/H uses the standard SMC (DO-214AB) package: a surface-mount, two-terminal device with no polarity marking for bidirectional operation. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Provides symmetrical conduction path during positive or negative voltage excursions beyond VBR. |
| Cathode | Transient return path (bidirectional) | Functions identically to anode in bidirectional configuration; no functional distinction-both terminals are electrically equivalent. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses (e.g., CAN, RS-485), and floating sensor interfaces without external polarity management. |
| 1500 W peak pulse rating | Withstands high-energy transients such as load dump (ISO 16750-2) and inductive switching spikes in automotive power distribution networks. |
| AEC-Q101 qualified | Validated for automotive under-hood and chassis-mounted applications requiring long-term reliability across -55 °C to +150 °C ambient conditions. |
| Halogen-free & RoHS-compliant | Meets global environmental regulations (IEC 61249-2-21) and supports lead-free reflow profiles up to 260 °C peak temperature (MSL Level 1). |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during suppression, reducing stress on downstream ICs like microcontrollers, transceivers, and analog front-ends. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V supply rails in body control modules against load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp absorbing >1500 W surges while limiting rail voltage to ≤113 V. Use Value: Prevents latch-up or permanent damage to PMICs and MCU power inputs during ISO 16750-2 Pulse 5a events. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA, 0–10 V) of pressure or temperature sensors in factory automation. IC Role / Device Role / Timing Role: Fast-response transient suppressor shunting ESD and EFT bursts before they reach precision ADC inputs. Use Value: Maintains signal integrity and measurement accuracy by clamping transients within 1 ns, with <1.0 μA leakage at 70 V. |
| Automotive CAN Bus Protection | Consumer Audio Line Protection |
Use Scenario: Shielding high-speed CAN FD transceivers (e.g., TJA1044) from coupled transients on vehicle wiring harnesses. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed across CANH/CANL differential pair. Use Value: Preserves signal rise/fall times (typical CJ < 100 pF at 0 V) while meeting ISO 11898-2 EMC immunity requirements. | Use Scenario: Protecting line-out jacks and headphone amplifiers in smart speakers from user-handling ESD (±8 kV contact discharge). IC Role / Device Role / Timing Role: Primary ESD clamp on unbalanced audio outputs, placed immediately at connector. Use Value: Eliminates pop/noise artifacts and prevents amplifier latch-up without degrading audio bandwidth (no series impedance added). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70CAHE3/A | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), same VWM and bidirectional structure. | Suitable for space-constrained consumer PCBs where surge energy is limited (e.g., USB ports); not recommended for automotive load dump. | Select when board area is critical and peak surge energy remains below 400 W. |
| 1.5KE70CA | Through-hole DO-201 package, identical VWM/VC/PPPM specs, but larger size and manual assembly requirement. | Used in legacy industrial power supplies where through-hole mounting and serviceability are prioritized over density. | Choose for prototyping, repair, or high-reliability systems requiring mechanical robustness and thermal mass. |
Compared with SMAJ70CAHE3/A and 1.5KE70CA, SMCJ70CAHM3/H delivers optimal balance of high-energy surge handling (1500 W), AEC-Q101 qualification, and SMC package compatibility with automated manufacturing-making it the preferred choice for production automotive and industrial designs requiring validated reliability and scalability.
Availability
SMCJ70CAHM3/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, CAN bus safeguarding, and consumer audio line protection requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ70CAHM3/H 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 performance.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure applications where robustness and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMCJ70CAHM3/H at its rated peak pulse current?
The SMCJ70CAHM3/H clamps to a maximum of 113 V at its rated peak pulse current of 13.3 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 standards and confirmed in Vishay's datasheet Document Number 88394, page 2. The clamping voltage directly determines the maximum stress imposed on protected circuitry during surge events, making it a critical parameter for system-level overvoltage design validation.
Is SMCJ70CAHM3/H suitable for automotive applications?
Yes, SMCJ70CAHM3/H is AEC-Q101 qualified and specifically designated for automotive use with the "HM3" suffix indicating halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. It meets requirements for temperature cycling, high-temperature reverse bias, and ESD robustness, supporting deployment in engine control units, body electronics, and infotainment power rails per ISO 16750-2 and ISO 11898-2 standards.
How does the bidirectional nature of SMCJ70CAHM3/H affect its circuit placement?
The bidirectional architecture of SMCJ70CAHM3/H eliminates polarity sensitivity, allowing direct placement across AC-coupled or differential signal pairs-such as CANH/CANL or RS-485 A/B-without regard to terminal orientation. Unlike unidirectional TVS diodes, SMCJ70CAHM3/H has no cathode marking and functions identically in either direction, simplifying layout and reducing BOM complexity in balanced interface protection schemes.
What is the thermal resistance of SMCJ70CAHM3/H, and how does it impact PCB layout?
SMCJ70CAHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's package drawing; reducing pad area increases RθJA and risks thermal runaway during repeated surges. Designers must allocate sufficient copper area and consider thermal vias if operating near PD = 6.5 W in sustained conditions.
Does SMCJ70CAHM3/H require derating at elevated ambient temperatures?
Yes, SMCJ70CAHM3/H requires derating above TA = 25 °C, as shown in Figure 2 of Vishay's datasheet 88394. At 85 °C ambient, its peak pulse power capability drops to approximately 70 % of the rated 1500 W, and at 125 °C, it falls to ~40 %. This derating is essential for reliable operation in under-hood automotive or enclosed industrial environments and must be factored into worst-case surge event analysis.
SMCJ70CAHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- 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)
SMCJ70CAHM3/H FAQ
1.How can I place an order for SMCJ70CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ70CAHM3/H 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 SMCJ70CAHM3/H reliable?
The price and inventory of SMCJ70CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ70CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ70CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ70CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ70CAHM3/H?
SMCJ70CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ70CAHM3/H 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 SMCJ70CAHM3/H?
For technical support, including SMCJ70CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ70CAHM3/H requirements.
6.How does Aetrix verify that SMCJ70CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ70CAHM3/H 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 SMCJ70CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMCJ70CAHM3/H?
All SMCJ70CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ70CAHM3/H, 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 SMCJ70CAHM3/H part is unused and in its original packaging.
Return procedure for SMCJ70CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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