My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ78CAHM3_A/I
- Part No.:
- SMCJ78CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78CAHM3_A/I.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,375
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ78CAHM3_A/I 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 126 V at 11.9 A peak pulse current (10/1000 μs), with 1500 W peak pulse power rating and 78 V standoff voltage. It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive, industrial, and telecom systems against inductive switching surges and lightning-induced transients.
For engineers reviewing the SMCJ78CAHM3_A/I datasheet, SMCJ78CAHM3_A/I pinout, SMCJ78CAHM3_A/I application, or SMCJ78CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, 126 V clamping voltage at rated surge current, and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown junction, responding in <1 ps to transient overvoltages. Its bidirectional symmetry ensures identical electrical characteristics in both polarities, eliminating polarity concerns in AC-coupled or floating signal paths.
Designed for high-energy surge suppression, it sustains 1500 W peak pulse power under standardized 10/1000 μs waveform conditions, with thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), enabling reliable operation up to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VWM) | 78 V - Maximum continuous reverse operating voltage before clamping begins |
| Breakdown Voltage (VBR) | 86.7 V min / 95.8 V max at 1 mA - Confirmed avalanche initiation range under DC test |
| Clamping Voltage (VC) | 126 V at 11.9 A IPPM - Peak voltage seen by protected circuit during full-rated surge event |
| Peak Pulse Power (PPPM) | 1500 W - Energy-handling capacity per IEEE C62.35 10/1000 μs waveform |
| Junction Temperature Range | -55 °C to +150 °C - Validated operating envelope for automotive and industrial environments |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal requirement |
| AEC-Q101 Qualified | Yes - Certified for automotive electronic systems per stress-test qualification protocol |
| Halogen-Free & RoHS | Yes - Meets JEDEC JESD201 Class 2 whisker resistance and UL 94 V-0 flammability |
Pinout & Package
SMCJ78CAHM3_A/I uses the SMC (DO-214AB) package: a surface-mount, molded plastic case with two coplanar matte tin-plated leads, no polarity marking (bidirectional), and mechanical dimensions of 7.75 mm × 6.22 mm × 2.62 mm (L × W × H). Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal per Vishay's thermal derating guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (either polarity) | One of two symmetrical terminals; bidirectional conduction enables AC/DC line protection without orientation constraints |
| Cathode | Transient current entry point (either polarity) | Second symmetrical terminal; identical to Anode in bidirectional configuration - no cathode band marking |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates polarity-sensitive layout and supports floating or AC-coupled interfaces |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for ADAS, body control, and infotainment modules |
| 1500 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when properly mounted on recommended copper area |
| Low clamping ratio (VC/VWM) | 1.61 - Ensures protected circuit remains below safe voltage thresholds during worst-case transients |
| Halogen-free & RoHS-compliant | Meets JESD201 Class 2 whisker resistance and global environmental regulations - supports green manufacturing and export compliance |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting 12 V/24 V power rails in engine control units (ECUs) and lighting modules from load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of LDOs and microcontrollers to limit rail voltage excursions. Use Value: Clamps to 126 V during 11.9 A surge, preventing latch-up or gate oxide damage in downstream silicon while maintaining AEC-Q101 compliance. | Use Scenario: Shielding analog outputs of pressure or temperature sensors connected to PLC I/O modules from EFT and surge coupling. IC Role / Device Role / Timing Role: Bidirectional shunt protector on differential or single-ended signal pairs exposed to noisy factory environments. Use Value: Symmetric clamping ensures equal protection for positive/negative transients without polarity-dependent design constraints. |
| Telecom Interface Port Protection | Consumer Device USB/DisplayPort Lines |
Use Scenario: Safeguarding Ethernet PHY or RS-485 transceivers in base station backhaul equipment against lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Secondary-level TVS placed after gas discharge tube (GDT) primary protection to handle residual energy. Use Value: 1500 W rating absorbs residual 10/1000 μs surges after GDT crowbarring, reducing let-through voltage to sub-130 V levels. | Use Scenario: Protecting high-speed interface lines (e.g., USB 2.0 D+/D−, DisplayPort AUX CH) in smart TVs and set-top boxes from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF typical at 0 V) bidirectional clamp placed adjacent to connector. Use Value: Maintains signal integrity up to 480 Mbps while suppressing ±15 kV contact ESD per IEC 61000-4-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ78CA-E3/57T | Lower PPPM (400 W), smaller SMA package, higher RθJA (110 °C/W), same VWM/VC | Not suitable for 1500 W surge events; limited to lower-energy IEC 61000-4-2/4-4 scenarios | Select only where board space is constrained and surge energy is ≤400 W |
| SMCJ78AHE3_A/I | Unidirectional version; includes cathode band marking; identical VWM, VBR, VC, PPPM, and package | Requires polarity-aware layout; unsuitable for AC or floating nodes | Choose only when circuit topology enforces fixed polarity and unidirectional clamping suffices |
Compared with SMAJ78CA-E3/57T and SMCJ78AHE3_A/I, the SMCJ78CAHM3_A/I uniquely combines 1500 W surge handling, bidirectional symmetry, AEC-Q101 qualification, and halogen-free construction - making it the only option among the three qualified for high-reliability automotive power rail protection.
Availability
SMCJ78CAHM3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom infrastructure, and consumer display port protection requiring stable component supply across extended production lifecycles.
Supply support for SMCJ78CAHM3_A/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, 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 applications where robustness against load dump, EFT, and lightning surges is mission-critical.
FAQ
What is the clamping voltage of the SMCJ78CAHM3_A/I at its rated peak pulse current?
The SMCJ78CAHM3_A/I has a maximum clamping voltage (VC) of 126 V at 11.9 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 88394. The clamping performance ensures protected circuits remain within safe operating limits during surge events.
Is the SMCJ78CAHM3_A/I suitable for automotive applications?
Yes, the SMCJ78CAHM3_A/I is AEC-Q101 qualified and explicitly designated for automotive use via its HM3 suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It meets stress-test requirements for temperature cycling, high-temperature reverse bias, and ESD, making it appropriate for engine control units, body electronics, and ADAS subsystems where reliability under thermal and electrical stress is critical.
How does the bidirectional nature of the SMCJ78CAHM3_A/I affect PCB layout?
The SMCJ78CAHM3_A/I has no polarity marking and identical electrical behavior in both directions, so PCB layout requires no orientation alignment - either terminal may connect to either side of the protected line. This simplifies routing for AC-coupled signals, differential buses, or floating grounds, and eliminates risk of misplacement during automated assembly. No cathode band is present, distinguishing it from unidirectional variants like SMCJ78AHE3_A/I.
What thermal pad layout is required for the SMCJ78CAHM3_A/I to achieve full 1500 W rating?
To sustain its full 1500 W peak pulse power rating, the SMCJ78CAHM3_A/I must be mounted on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in Vishay's datasheet. Smaller pads cause thermal derating - e.g., at 25 °C ambient, junction temperature rises ~75 °C/W; insufficient copper reduces effective surge handling and risks parametric shift or failure during repeated transients.
Does the SMCJ78CAHM3_A/I meet RoHS and halogen-free requirements?
Yes, the SMCJ78CAHM3_A/I carries the HM3 suffix, indicating it is halogen-free, RoHS-compliant, and qualified to JESD201 Class 2 for whisker resistance. Its molding compound meets UL 94 V-0 flammability rating, and matte tin-plated leads comply with J-STD-002 and JESD22-B102 solderability standards - fulfilling environmental and reliability mandates for global electronics manufacturing.
SMCJ78CAHM3_A/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:
- 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/I FAQ
1.How can I place an order for SMCJ78CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78CAHM3_A/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 SMCJ78CAHM3_A/I reliable?
The price and inventory of SMCJ78CAHM3_A/I 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/I is usually 5 days.
3.What payment methods are accepted for SMCJ78CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78CAHM3_A/I?
SMCJ78CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78CAHM3_A/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 SMCJ78CAHM3_A/I?
For technical support, including SMCJ78CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78CAHM3_A/I requirements.
6.How does Aetrix verify that SMCJ78CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ78CAHM3_A/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 SMCJ78CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ78CAHM3_A/I?
All SMCJ78CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78CAHM3_A/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 SMCJ78CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ78CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ78CAHM3_A/I 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 …
