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Vishay General Semiconductor - Diodes Division SMCJ78AHM3/I
- Part No.:
- SMCJ78AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78AHM3/I.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,841
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Product details
Overview
SMCJ78AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 78 V standoff voltage (VWM), 126 V clamping voltage (VC) at 11.9 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM). It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMCJ78AHM3/I datasheet, SMCJ78AHM3/I pinout, SMCJ78AHM3/I application, or SMCJ78AHM3/I equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant HM3 suffix, 1500 W 10/1000 µs surge rating, and SMC package compatibility with automated placement and J-STD-020 MSL level 1 reflow.
Technical Context
This TVS diode operates as a unidirectional clamping device with a reverse standoff voltage of 78 V and a minimum breakdown voltage of 86.7 V at 1 mA test current. Its low incremental surge resistance and fast response time enable effective suppression of inductive switching transients and lightning-induced surges on DC power rails and signal paths.
The device features glass passivated junction construction, matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and meets UL 94 V-0 flammability requirements. Its thermal resistance (RθJA = 75 °C/W) and maximum junction temperature of 150 °C support reliable operation under repetitive surge conditions when mounted per recommended 8.0 mm × 8.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min / max | 86.7 V / 95.8 V at 1 mA - Ensures predictable turn-on threshold across production lot |
| VC @ IPPM | 126 V at 11.9 A - Clamped voltage during 10/1000 µs surge, limiting stress on downstream components |
| PPPM | 1500 W - Peak surge power handling capability under standardized waveform |
| ID @ VWM | 1.0 µA - Ultra-low leakage preserves efficiency in high-impedance bias networks |
| TJ max | +150 °C - Enables use in under-hood automotive environments and industrial enclosures |
| Package | SMC (DO-214AB) - Surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
SMCJ78AHM3/I uses the standard SMC (DO-214AB) package: a surface-mount, molded plastic case with two terminals and a cathode band marking. The device is unidirectional; the banded end denotes the cathode terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink | Connected to protected line; conducts transient energy to ground during overvoltage events |
| Anode | Reference node | Typically tied to system ground or low-impedance return path for clamping action |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock per JESD22 standards |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations without compromising solderability or long-term stability |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow without preconditioning; eliminates moisture-related popcorning risk |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes voltage overshoot during surge, reducing stress margin requirements for protected ICs |
| 1500 W 10/1000 µs rating | Handles high-energy transients common in 24 V/48 V industrial and commercial power systems |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24 V supply rails in body control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤126 V, preventing damage to 36 V-rated input capacitors and controller ICs. | Use Scenario: Shielding analog input channels of programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Primary surge suppression element on 0–10 V or 4–20 mA sensor interface lines. Use Value: Withstands repeated 1 kV/500 A surges per IEC 61000-4-5, preserving measurement accuracy and channel integrity. |
| Telecom DC Power Feeds | Motor Drive Gate Driver Protection |
Use Scenario: Safeguarding -48 V telecom rectifier outputs and backplane power distribution against lightning-induced surges. IC Role / Device Role / Timing Role: High-power TVS placed at power entry point upstream of bulk filtering and regulation stages. Use Value: Absorbs up to 1500 W of surge energy without degradation, maintaining uninterrupted service during transient events. | Use Scenario: Protecting high-side and low-side gate drivers in 3-phase inverters from Miller-induced voltage spikes. IC Role / Device Role / Timing Role: Clamp diode on driver VDD rail to suppress ringing and cross-conduction risks. Use Value: Fast response (<1 ps) and low clamping voltage prevent false triggering and ensure robust MOSFET switching behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ78A-E3/57T | Lower PPPM (400 W), SMA package (smaller footprint, lower thermal mass) | Suitable only for lower-energy transients; not rated for automotive load dump | Select when space-constrained and surge energy is limited to <400 W |
| SMCJ78AHE3_A/I | Same electrical specs but E3 suffix (RoHS-compliant, non-halogen-free, commercial grade) | Lacks AEC-Q101 qualification and JESD201 Class 2 whisker resistance | Choose for cost-sensitive industrial designs where automotive qualification is unnecessary |
Compared with SMCJ78AHM3/I, SMAJ78A-E3/57T offers reduced surge capacity in a smaller package, while SMCJ78AHE3_A/I provides identical clamping performance without halogen-free or automotive-grade assurance-making SMCJ78AHM3/I the optimal choice for AEC-Q101–mandated and high-reliability industrial deployments.
Availability
SMCJ78AHM3/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, telecom DC power feeds, and motor drive gate driver protection requiring stable component supply and full traceability.
Supply support for SMCJ78AHM3/I 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, TVS devices, and optoelectronics 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 applications where robustness against ISO 7637-2, IEC 61000-4-5, and lightning-induced surges is critical.
FAQ
What is the clamping voltage of SMCJ78AHM3/I at its rated peak pulse current?
The SMCJ78AHM3/I has a maximum clamping voltage (VC) of 126 V at its specified peak pulse current (IPPM) of 11.9 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream circuitry. The SMCJ78AHM3/I maintains this clamping performance across its qualified operating temperature range.
Is SMCJ78AHM3/I qualified for automotive applications?
Yes, SMCJ78AHM3/I is AEC-Q101 qualified, as indicated by the "HM3" suffix. It undergoes rigorous stress testing-including temperature cycling, humidity, and mechanical shock-to meet automotive reliability requirements. The SMCJ78AHM3/I is approved for use in engine control units, body electronics, and ADAS power supplies where sustained operation at 150 °C junction temperature is required.
What does the "HM3" suffix signify in SMCJ78AHM3/I?
The "HM3" suffix in SMCJ78AHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with JESD201 Class 2 whisker resistance, MSL Level 1 reflow capability (260 °C peak), and UL 94 V-0 flammability rating. The SMCJ78AHM3/I is distinct from E3-suffix variants, which lack halogen-free and automotive-grade certifications.
How is the polarity marked on SMCJ78AHM3/I?
The SMCJ78AHM3/I is a unidirectional TVS diode with polarity indicated by a cathode band on the SMC (DO-214AB) package body. The banded end corresponds to the cathode terminal, which must be connected toward the side of the circuit to be protected (e.g., positive rail), while the anode connects to ground or reference. No marking appears on bidirectional variants, but SMCJ78AHM3/I is explicitly unidirectional.
What is the maximum peak pulse current rating for SMCJ78AHM3/I?
The SMCJ78AHM3/I is rated for a maximum peak pulse current (IPPM) of 11.9 A under the standard 10/1000 µs double-exponential waveform. This rating assumes mounting on 8.0 mm × 8.0 mm copper pads per terminal, as defined in the Vishay datasheet. Derating applies above 25 °C ambient temperature per Figure 2 in document 88394, and the SMCJ78AHM3/I retains full functionality within its -55 °C to +150 °C junction temperature range.
SMCJ78AHM3/I 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 78V
- Voltage - Breakdown (Min):
- 86.7V
- Voltage - Clamping (Max) @ Ipp:
- 126V
- Current - Peak Pulse (10/1000µs):
- 11.9A
- 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)
SMCJ78AHM3/I FAQ
1.How can I place an order for SMCJ78AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78AHM3/I 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 SMCJ78AHM3/I reliable?
The price and inventory of SMCJ78AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ78AHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ78AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78AHM3/I?
SMCJ78AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78AHM3/I 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 SMCJ78AHM3/I?
For technical support, including SMCJ78AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78AHM3/I requirements.
6.How does Aetrix verify that SMCJ78AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ78AHM3/I 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 SMCJ78AHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ78AHM3/I?
All SMCJ78AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78AHM3/I, 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 SMCJ78AHM3/I part is unused and in its original packaging.
Return procedure for SMCJ78AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ78AHM3/I Tags
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