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Vishay General Semiconductor - Diodes Division SMCJ78AHM3/H
- Part No.:
- SMCJ78AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78AHM3/H.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,368
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Product details
Overview
SMCJ78AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 78 V standoff voltage (VWM), 86.7–95.8 V breakdown voltage (VBR), and 1500 W peak pulse power (PPPM) at 10/1000 µs waveform. It clamps transients to ≤126 V at 11.9 A peak pulse current (IPPM), and is halogen-free, RoHS-compliant, and qualified to AEC-Q101 for automotive use.
For engineers reviewing the SMCJ78AHM3/H datasheet, SMCJ78AHM3/H pinout, SMCJ78AHM3/H application, or SMCJ78AHM3/H equivalent, this device is selected for robust overvoltage protection on DC power rails, automotive sensor interfaces, and industrial control I/O lines where fast response (<1 ns), low clamping voltage, and high surge immunity are critical.
Technical Context
The SMCJ78AHM3/H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified VBR range (86.7–95.8 V at 1 mA test current). Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1 µA at 78 V), while its low incremental surge resistance enables effective energy diversion during transient events.
Thermally, it features RθJA = 75 °C/W and RθJL = 15 °C/W, supporting reliable operation up to TJ = +150 °C. The device meets J-STD-020 MSL Level 1 (peak reflow 260 °C) and is rated for non-repetitive 8.3 ms half-sine surge currents up to 200 A (IFSM), making it suitable for both single-event and repetitive surge environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 78 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR (Breakdown Voltage) | 86.7–95.8 V at 1 mA - Confirmed avalanche initiation range; ensures predictable turn-on under surge conditions. |
| VC (Clamping Voltage) | 126 V at IPPM = 11.9 A - Peak voltage seen by protected circuit during 1500 W transient; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 1500 W at 10/1000 µs - Energy-handling capacity for standardized lightning/surge waveforms per IEC 61000-4-5. |
| ID (Reverse Leakage) | <1 µA at 78 V - Negligible standby power loss and minimal impact on high-impedance signal paths. |
| TJ max. | +150 °C - Enables deployment in under-hood automotive and industrial environments without derating. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per AEC standard. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential node in unidirectional configuration; carries forward surge current during clamping. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 78 V rail); avalanche conduction initiates here when Vreverse ≥ VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power rating | Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 78 V DC systems without failure. |
| Glass passivated junction | Ensures consistent VBR tolerance and long-term stability across thermal cycling and humidity exposure. |
| AEC-Q101 qualification (HM3 suffix) | Validated for automotive applications including engine control units, ADAS sensors, and infotainment power supplies. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements for green manufacturing. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; compatible with high-volume SMT assembly. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 78 V battery-derived supply rails in commercial vehicle ECUs against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between rail and ground, activated within <1 ns of overvoltage event. Use Value: Limits rail voltage to ≤126 V during 11.9 A surge, preventing damage to downstream PMICs and microcontrollers rated for 80 V absolute maximum. |
Use Scenario: Safeguarding analog input channels of PLC analog I/O modules connected to 4–20 mA current loops exposed to field wiring transients. IC Role / Device Role / Timing Role: Standoff-connected TVS on signal line-to-ground path, absorbing induced surges before reaching precision ADC front-end. Use Value: Maintains signal integrity with <1 µA leakage at 78 V, while clamping fast-rising transients to prevent ADC saturation or latch-up. |
| Telecom DC Power Feeder Protection | Renewable Energy Charge Controller Input |
|
Use Scenario: Shielding -48 V telecom rectifier outputs from lightning-induced surges on outdoor plant cabling. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at power entry point, shunting surge energy directly to chassis ground. Use Value: Withstands repeated 1500 W pulses without parameter shift, ensuring multi-year field reliability in harsh outdoor cabinets. |
Use Scenario: Protecting MPPT charge controller inputs connected to solar panel strings operating near 78 V open-circuit voltage. IC Role / Device Role / Timing Role: Primary overvoltage clamp on PV+ line, activated only during rare lightning or switching transients. Use Value: Provides fail-safe clamping without loading the PV string under normal operation due to sub-µA leakage at VWM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ78A-E3/57T | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), same VWM/VBR range. | Restricted to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 or automotive load dump. | Select only for space-constrained consumer electronics with <500 W surge requirements. |
| SMCJ78AHE3_A/H | Identical electrical specs and SMC package, but RoHS-compliant commercial grade (not AEC-Q101 qualified). | Lacks automotive qualification testing; not approved for safety-critical vehicle subsystems. | Choose for cost-sensitive industrial or telecom applications where AEC-Q101 is not mandated. |
Compared with SMAJ78A-E3/57T and SMCJ78AHE3_A/H, the SMCJ78AHM3/H uniquely combines 1500 W surge capability, AEC-Q101 qualification, and halogen-free construction-making it the only option among the three validated for high-reliability automotive power rail protection.
Availability
SMCJ78AHM3/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC analog I/O modules, telecom DC feeder systems, and renewable energy charge controllers requiring stable component supply and full AEC-Q101 compliance.
Supply support for SMCJ78AHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in automotive, industrial, and telecom infrastructure where robustness against lightning, ESD, and inductive switching surges is mandatory.
FAQ
What is the clamping voltage of the SMCJ78AHM3/H at its rated peak pulse current?
The SMCJ78AHM3/H has a maximum clamping voltage (VC) of 126 V when subjected to its rated peak pulse current (IPPM) of 11.9 A under a 10/1000 µs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number: 88394, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ78AHM3/H maintains this clamping performance consistently due to its glass-passivated junction and low incremental surge resistance.
Is the SMCJ78AHM3/H suitable for automotive applications?
Yes, the SMCJ78AHM3/H is explicitly qualified to AEC-Q101 and carries the HM3 suffix denoting halogen-free, RoHS-compliant, and automotive-grade construction. It undergoes rigorous stress testing-including temperature cycling, highly accelerated life testing (HALT), and ESD validation-to ensure reliability in under-hood and chassis-mounted automotive systems. The SMCJ78AHM3/H is approved for use in engine control units, ADAS sensor power supplies, and body electronics where sustained operation at +150 °C and immunity to load dump transients are required.
How does the SMCJ78AHM3/H differ from the SMCJ78AHE3_A/H variant?
The SMCJ78AHM3/H and SMCJ78AHE3_A/H share identical electrical specifications (VWM = 78 V, VBR = 86.7–95.8 V, VC = 126 V, PPPM = 1500 W) and SMC (DO-214AB) package, but differ in qualification and material content. The SMCJ78AHM3/H is halogen-free and AEC-Q101 qualified, whereas the SMCJ78AHE3_A/H is RoHS-compliant but commercial-grade only. This makes the SMCJ78AHM3/H the required choice for automotive OEM designs, while the SMCJ78AHE3_A/H serves cost-sensitive industrial applications without qualification mandates.
What is the maximum reverse leakage current for the SMCJ78AHM3/H at its stand-off voltage?
The SMCJ78AHM3/H exhibits a maximum reverse leakage current (ID) of 1 µA at its stand-off voltage (VWM) of 78 V and ambient temperature of 25 °C. This ultra-low leakage ensures minimal power loss in always-on systems and prevents loading of high-impedance sensor signal paths or precision reference circuits. The value is confirmed in the "ELECTRICAL CHARACTERISTICS" table of the Vishay datasheet (88394), and remains stable across the full operating temperature range due to the device's glass-passivated junction structure.
Can the SMCJ78AHM3/H be used in bidirectional configurations?
No, the SMCJ78AHM3/H is a unidirectional TVS diode, as indicated by the "A" suffix and absence of "CA" in its part number. Its cathode band marking and internal structure support clamping only in reverse bias; forward conduction is limited to 3.5 V at 100 A (per datasheet note 6). For bidirectional protection-such as AC line or data bus applications-Vishay specifies variants with the "CA" suffix (e.g., SMCJ78CA), which provide symmetrical clamping in both polarities. Using the SMCJ78AHM3/H in bidirectional roles would result in unintended forward conduction and potential failure.
SMCJ78AHM3/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:
- 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/H FAQ
1.How can I place an order for SMCJ78AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78AHM3/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 SMCJ78AHM3/H reliable?
The price and inventory of SMCJ78AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ78AHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ78AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78AHM3/H?
SMCJ78AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78AHM3/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 SMCJ78AHM3/H?
For technical support, including SMCJ78AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78AHM3/H requirements.
6.How does Aetrix verify that SMCJ78AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ78AHM3/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 SMCJ78AHM3/H meets industry standards.
7.What is the process for return or replacement of SMCJ78AHM3/H?
All SMCJ78AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78AHM3/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 SMCJ78AHM3/H part is unused and in its original packaging.
Return procedure for SMCJ78AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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