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Vishay General Semiconductor - Diodes Division SMCJ78CAHM3_A/H
- Part No.:
- SMCJ78CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78CAHM3_A/H.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,500
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Product details
Overview
SMCJ78CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with 126 V clamping voltage at 11.9 A peak surge current. It features 78 V standoff voltage, 86.7–95.8 V breakdown voltage range at 1 mA test current, and operates across -55 °C to +150 °C junction temperature.
For engineers reviewing the SMCJ78CAHM3_A/H datasheet, SMCJ78CAHM3_A/H pinout, SMCJ78CAHM3_A/H application, or SMCJ78CAHM3_A/H equivalent, this device is selected for robust overvoltage protection on DC power rails, automotive sensor interfaces, and industrial I/O lines where fast response (<1 ns), low clamping ratio, and AEC-Q101 qualification are required.
Technical Context
This bidirectional TVS diode operates symmetrically in both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA at 78 V), while the SMC package delivers high thermal dissipation (RθJL = 15 °C/W) and meets MSL Level 1 reflow compatibility.
The device complies with ANSI/IEEE C62.35 surge waveform standards using 10/1000 μs pulses and is rated for 200 A unidirectional surge (not applicable here due to bidirectional configuration). Temperature coefficient of VBR is +0.106 %/°C, supporting predictable voltage drift over operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VWM) | 78 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin below clamping threshold. |
| Breakdown Voltage (VBR) | 86.7–95.8 V at 1 mA - Confirmed voltage range where device transitions into avalanche conduction; ensures reliable triggering under transient stress. |
| Clamping Voltage (VC) | 126 V at 11.9 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; determines maximum stress on downstream components. |
| Peak Pulse Power (PPPM) | 1500 W - Surge energy handling capacity per IEEE C62.35 10/1000 μs waveform; supports high-energy transients like ISO 7637-2 Pulse 5a. |
| Junction Temperature Range | -55 °C to +150 °C - Validated operating envelope for automotive under-hood and industrial environments with thermal cycling. |
| Leakage Current (ID) | <1 μA at 78 V - Minimal standby power loss and negligible loading on sensitive analog or low-power circuits. |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal relief; supports automated placement and J-STD-020-compliant reflow. |
Pinout & Package
SMCJ78CAHM3_A/H uses the SMC (DO-214AB) package: a 2-terminal, non-polarized surface-mount case with no cathode/anode 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 |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as symmetrical connection point; no polarity dependency enables flexible PCB layout on differential or floating nodes. |
| Terminal 2 | Anode/Cathode (bidirectional) | Electrically identical to Terminal 1; bidirectional symmetry eliminates orientation constraints during assembly and simplifies routing. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces per stress test requirements. |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for industrial and consumer electronics without compromising surge robustness. |
| Low incremental surge resistance | Enables tighter clamping (126 V at 11.9 A) versus competing TVS devices, reducing voltage overshoot on protected ICs. |
| Fast response time (<1 ns) | Clamps transients before they propagate through system traces, protecting high-speed logic and precision analog front-ends. |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without preconditioning, eliminating moisture sensitivity handling overhead. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching spikes in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across signal/power pair to shunt surge energy to ground before reaching interface IC. Use Value: Maintains signal integrity during ISO 16750-2 load dump events (up to 120 V) while preserving <1 μA leakage for accurate sensor biasing. |
Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Primary overvoltage clamp on channel-level inputs, coordinated with upstream fusing and filtering. Use Value: Withstands repeated 1500 W surges without degradation, extending maintenance intervals and reducing false-trip failures in factory automation. |
| Telecom Power Rail Protection | Consumer USB Port Protection |
|
Use Scenario: Guarding 48 V PoE-powered Ethernet switch ports against lightning-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: Secondary-stage TVS after primary GDT or MOV, providing precise clamping near IC absolute maximum ratings. Use Value: 126 V clamping voltage ensures protected PHY ICs remain within 30 V safety margin relative to 100 V max rating. |
Use Scenario: Adding robust ESD and surge immunity to USB 2.0 data lines and VBUS in smart home hubs and portable chargers. IC Role / Device Role / Timing Role: Low-capacitance bidirectional suppressor placed directly at connector, minimizing trace inductance impact. Use Value: Sub-100 pF junction capacitance (typ.) preserves signal integrity up to 480 Mbps while meeting IEC 61000-4-2 Level 4 (±15 kV air). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78CAHM3_A/H | Lower PPPM (600 W), same VWM/VC, SMB package (smaller footprint, lower thermal mass) | Better suited for space-constrained consumer PCBs with moderate surge exposure (IEC 61000-4-5 0.5 kV) | Select when board area is critical and peak surge energy does not exceed 600 W; verify thermal derating at elevated ambient. |
| SMCJ78AHE3_A/H | Unidirectional version, identical VWM/VC/PPPM, same SMC package, commercial-grade (non-AEC-Q101) | Applicable in cost-sensitive industrial power supplies where polarity is fixed and automotive qualification is unnecessary | Choose for non-automotive designs requiring identical clamping performance without AEC-Q101 validation overhead. |
Compared with SMCJ78CAHM3_A/H, SMBJ78CAHM3_A/H trades surge capacity for compactness, while SMCJ78AHE3_A/H removes bidirectionality and automotive qualification-both require explicit validation of polarity and environmental compliance in target systems.
Availability
SMCJ78CAHM3_A/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O modules, telecom PoE port protection, and consumer USB power delivery systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMCJ78CAHM3_A/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 optimization.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where failure resilience and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of the SMCJ78CAHM3_A/H at its rated peak pulse current?
The SMCJ78CAHM3_A/H has a maximum clamping voltage (VC) of 126 V when subjected to its specified peak pulse current of 11.9 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ78CAHM3_A/H maintains this clamping performance across its full operating temperature range.
Is the SMCJ78CAHM3_A/H suitable for automotive applications?
Yes, the SMCJ78CAHM3_A/H is AEC-Q101 qualified and explicitly designated for automotive use, as indicated by the "HM3" suffix denoting halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. It is validated for under-hood and chassis-mounted applications including engine control, body electronics, and ADAS sensor interfaces where sustained operation from -55 °C to +150 °C and immunity to load dump transients are required. The SMCJ78CAHM3_A/H meets all stress test requirements defined in the AEC-Q101 standard.
How does the bidirectional configuration of the SMCJ78CAHM3_A/H affect its circuit implementation?
The bidirectional configuration of the SMCJ78CAHM3_A/H means it conducts identically in both polarities, eliminating the need for polarity-aware placement on PCBs. This allows direct placement across floating signal pairs (e.g., RS-485, CAN differential lines) or AC-coupled power rails without concern for anode/cathode orientation. Unlike unidirectional TVS diodes, the SMCJ78CAHM3_A/H has no band marking and requires no directional routing-simplifying layout and reducing assembly errors. Its symmetric VBR ensures matched clamping in either direction.
What is the thermal resistance profile of the SMCJ78CAHM3_A/H, and how does it impact PCB layout?
The SMCJ78CAHM3_A/H has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient (RθJA) of 75 °C/W when mounted on minimum recommended 8.0 mm × 8.0 mm copper pads per terminal. To maintain reliability under repeated surge conditions, PCB layout must provide adequate copper area for heat spreading-especially critical in high-duty-cycle applications like industrial motor drives. The SMCJ78CAHM3_A/H's low RθJL enables efficient heat transfer to the PCB, but thermal derating above 25 °C ambient must follow Figure 2 in the Vishay datasheet 88394.
Does the SMCJ78CAHM3_A/H meet industry standards for surge immunity testing?
Yes, the SMCJ78CAHM3_A/H is characterized per ANSI/IEEE C62.35 for transient suppression and supports compliance with key immunity standards including IEC 61000-4-5 (surge), IEC 61000-4-2 (ESD), and ISO 7637-2 (automotive transients). Its 1500 W peak pulse power rating and 126 V clamping voltage enable system-level pass-fail margins for Level 3 and Level 4 surge tests. The SMCJ78CAHM3_A/H itself is not certified to these standards, but its electrical parameters are used to design compliant protection networks verified at the system level.
SMCJ78CAHM3_A/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ78CAHM3_A/H FAQ
1.How can I place an order for SMCJ78CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78CAHM3_A/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 SMCJ78CAHM3_A/H reliable?
The price and inventory of SMCJ78CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ78CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ78CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78CAHM3_A/H?
SMCJ78CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78CAHM3_A/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 SMCJ78CAHM3_A/H?
For technical support, including SMCJ78CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78CAHM3_A/H requirements.
6.How does Aetrix verify that SMCJ78CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ78CAHM3_A/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 SMCJ78CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ78CAHM3_A/H?
All SMCJ78CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78CAHM3_A/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 SMCJ78CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMCJ78CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ78CAHM3_A/H Tags
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