My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ78CA-M3/57T
- Part No.:
- SMCJ78CA-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78CA-M3/57T.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,737
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ78CA-M3/57T from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with 126 V maximum clamping voltage at 11.9 A peak pulse current, 78 V standoff voltage, and ±10% breakdown voltage tolerance (86.7–95.8 V). It protects signal lines and power rails in automotive sensor interfaces and industrial I/O modules.
For engineers reviewing the SMCJ78CA-M3/57T datasheet, SMCJ78CA-M3/57T pinout, SMCJ78CA-M3/57T application, or SMCJ78CA-M3/57T equivalent, key selection criteria include bidirectional clamping capability, 1500 W 10/1000 μs surge rating, 75 °C/W junction-to-ambient thermal resistance, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at 78 V) across -55 °C to +150 °C operating temperature range.
The device delivers fast response time (<1.0 ps) to transient events and maintains low incremental surge resistance, resulting in consistent clamping performance under repetitive surge stress. Its SMC package supports high-power dissipation while meeting J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 1500 W - sustains high-energy surges common in automotive load-dump and industrial switching noise |
| Standoff Voltage (VWM) | 78 V - defines maximum continuous reverse operating voltage before clamping initiates |
| Breakdown Voltage (VBR) | 86.7–95.8 V at 1 mA - tight ±10% tolerance ensures predictable turn-on threshold |
| Clamping Voltage (VC) | 126 V at 11.9 A IPPM - limits downstream voltage stress during surge events |
| Junction Temperature Range | -55 °C to +150 °C - enables deployment in under-hood automotive and industrial control environments |
| Thermal Resistance (RθJA) | 75 °C/W - determines required copper pad area (8.0 mm × 8.0 mm per terminal) for thermal management |
| Leakage Current (ID) | ≤1.0 μA at 78 V - minimizes standby power loss in always-on sensor circuits |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); polarity unmarked for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (bidirectional) | Accepts surge current from either polarity; connects to protected line or node |
| Cathode | Transient current exit point (bidirectional) | Routes clamped current to ground or return path; no band marking on SMCJ78CA |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), and floating nodes without polarity constraints |
| 1500 W peak pulse rating | Withstands ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Combination Wave surges in automotive ECUs |
| Halogen-free & RoHS-compliant (M3) | Meets environmental compliance requirements for industrial and automotive OEM supply chains |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow compatibility without dry-pack handling or baking |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and low leakage under thermal cycling and humidity stress |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from ESD and load-dump transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between signal line and chassis ground, responding within picoseconds to overvoltage events. Use Value: Prevents latch-up or permanent damage to 5 V or 12 V sensor interface ICs by limiting transient voltage to ≤126 V at 11.9 A. |
Use Scenario: Safeguarding 4–20 mA current-loop inputs and 0–10 V analog inputs in programmable logic controllers against field-wiring induced surges. IC Role / Device Role / Timing Role: Primary transient suppressor mounted directly at connector entry point, shunting surge energy before reaching precision ADC or op-amp stages. Use Value: Maintains signal integrity by holding clamped voltage below 126 V while supporting >100,000 surge cycles per IEC 61000-4-5. |
| Telecom Line Card Protection | Power Supply Input Stage |
Use Scenario: Shielding Ethernet PHYs, PoE injectors, and DSL line drivers from lightning-induced surges on twisted-pair telecom lines. IC Role / Device Role / Timing Role: Secondary-level protector used downstream of gas discharge tubes or polymer PTCs in multi-stage telecom surge architectures. Use Value: Provides low-clamping-voltage follow-on protection with <1.0 μA leakage to avoid degrading 100BASE-TX signal integrity. |
Use Scenario: Clamping input rail transients on DC-DC converters and LDO regulators in battery-powered edge devices and IoT gateways. IC Role / Device Role / Timing Role: Fast-acting parallel suppressor across 78 V nominal input rails (e.g., 48 V telecom systems with 20% tolerance). Use Value: Limits input voltage excursion to 126 V during 1500 W surges, preventing overvoltage shutdown or internal FET failure in upstream regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78CA-M3/57T | Lower 600 W peak pulse power; same 78 V VWM and bidirectional configuration; SMB package (smaller footprint, higher RθJA = 110 °C/W) | Preferred where board space is constrained but surge energy is lower (e.g., consumer USB ports) | Select when thermal budget allows higher junction temperature rise and PCB area is limited |
| SMCJ78A-M3/57T | Unidirectional version; identical VWM, VBR, VC, and package; requires correct polarity orientation during layout | Used only in DC-biased circuits where reverse conduction must be blocked (e.g., 78 V supply rail) | Choose only if system topology mandates unidirectional blocking; otherwise SMCJ78CA-M3/57T offers greater design flexibility |
Compared with SMBJ78CA-M3/57T, SMCJ78CA-M3/57T provides 2.5× higher surge power handling and better thermal performance; compared with SMCJ78A-M3/57T, it eliminates polarity dependency-critical for AC-coupled or floating signal protection where layout orientation cannot be guaranteed.
Availability
SMCJ78CA-M3/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC analog inputs, telecom line card protection, and power supply input stage designs requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMCJ78CA-M3/57T 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, power efficiency, and automotive qualification.
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 and IEC 61000-4-5 surges is mandatory.
FAQ
What is the clamping voltage of SMCJ78CA-M3/57T at its rated peak pulse current?
The SMCJ78CA-M3/57T has a maximum clamping voltage (VC) of 126 V at 11.9 A peak pulse current (IPPM), measured under the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-rated surge event and is confirmed in Vishay's datasheet Document Number 88394, page 2. The SMCJ78CA-M3/57T maintains this clamping performance across its full operating temperature range.
Is SMCJ78CA-M3/57T suitable for automotive applications?
Yes, the SMCJ78CA-M3/57T meets AEC-Q101 qualification when ordered with HE3 or HM3 suffixes; however, the M3/57T variant is commercial-grade and not AEC-Q101 certified. It remains widely used in non-safety-critical automotive subsystems-including body control modules and infotainment interfaces-where its 1500 W surge rating and -55 °C to +150 °C operating range satisfy functional requirements. For AEC-Q101 compliance, specify SMCJ78CA-HM3/57T instead of SMCJ78CA-M3/57T.
How does the bidirectional configuration of SMCJ78CA-M3/57T affect PCB layout?
The SMCJ78CA-M3/57T has no polarity marking and functions identically in both directions, eliminating orientation constraints during PCB layout and automated placement. Unlike unidirectional variants (e.g., SMCJ78A-M3/57T), it requires no cathode band alignment, reducing assembly errors and enabling use in AC-coupled or differential signal paths such as RS-485 or CAN FD. This symmetry simplifies design reuse across multiple interface types without layout revision.
What is the thermal resistance and recommended pad layout for SMCJ78CA-M3/57T?
The SMCJ78CA-M3/57T 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, as specified in Vishay's datasheet. To achieve this rating, each pad must be solid, unbroken, and thermally connected to internal ground planes via ≥4 thermal vias (0.3 mm diameter). Deviation from this layout increases junction temperature and reduces surge endurance-especially critical in repeated transient scenarios.
Does SMCJ78CA-M3/57T have halogen-free and RoHS-compliant construction?
Yes, the "M3" suffix in SMCJ78CA-M3/57T explicitly denotes halogen-free, RoHS-compliant construction per JEDEC standards, including lead-free matte tin plating and UL 94 V-0 compliant molding compound. This makes the SMCJ78CA-M3/57T suitable for environmentally regulated markets and industrial OEMs requiring full material declarations. The "E3" suffix indicates RoHS compliance without halogen-free assurance, while "HM3" adds AEC-Q101 qualification.
SMCJ78CA-M3/57T 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ78CA-M3/57T FAQ
1.How can I place an order for SMCJ78CA-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78CA-M3/57T 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 SMCJ78CA-M3/57T reliable?
The price and inventory of SMCJ78CA-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ78CA-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ78CA-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78CA-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78CA-M3/57T?
SMCJ78CA-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78CA-M3/57T 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 SMCJ78CA-M3/57T?
For technical support, including SMCJ78CA-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78CA-M3/57T requirements.
6.How does Aetrix verify that SMCJ78CA-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ78CA-M3/57T 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 SMCJ78CA-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ78CA-M3/57T?
All SMCJ78CA-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78CA-M3/57T, 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 SMCJ78CA-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ78CA-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ78CA-M3/57T Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
