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Vishay General Semiconductor - Diodes Division SMCJ51CAHM3/I
- Part No.:
- SMCJ51CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51CAHM3/I.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,251
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Product details
Overview
SMCJ51CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 51 V standoff voltage (VWM), 82.4 V maximum clamping voltage (VC) at 18.2 A peak pulse current (IPPM), and 1500 W peak pulse power dissipation (10/1000 µs waveform), making it suitable for automotive sensor line protection and industrial I/O interface surge suppression.
For engineers reviewing the SMCJ51CAHM3/I datasheet, SMCJ51CAHM3/I pinout, SMCJ51CAHM3/I application, or SMCJ51CAHM3/I equivalent, this device delivers AEC-Q101-qualified transient immunity with halogen-free, RoHS-compliant construction - critical for automotive-grade ECU designs, industrial PLC analog inputs, and telecom power rail protection where reliability under repetitive surge stress is mandatory.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with breakdown voltage (VBR) specified between 56.7 V and 62.7 V at 1 mA test current. Its low incremental surge resistance enables fast clamping response (<1 ns), while the glass-passivated junction ensures stable performance across -55 °C to +150 °C operating temperature range.
The device meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), supports automated SMT placement, and exhibits <1.0 µA reverse leakage at VWM, minimizing standby power impact on protected circuits such as CAN transceiver bias rails or ADC reference inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 48 V nominal systems. |
| VBR min/max | 56.7 V / 62.7 V - Breakdown occurs within this band at 1 mA; ensures predictable turn-on threshold across production lots. |
| VC @ IPPM | 82.4 V - Clamped voltage during 18.2 A 10/1000 µs surge; limits downstream IC stress to safe levels. |
| PPPM | 1500 W - Peak pulse power handling capacity; sustains high-energy transients like ISO 7637-2 Pulse 5a without failure. |
| IPPM | 18.2 A - Peak surge current supported at rated clamping voltage; validates protection level against IEC 61000-4-5 Combination Wave. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal design; compatible with IPC-7351B footprint. |
Pinout & Package
SMCJ51CAHM3/I is a two-terminal bidirectional TVS diode housed in the SMC (DO-214AB) package. No polarity marking is present on the case, as conduction occurs identically in both directions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as anode or cathode depending on applied polarity; no fixed polarity designation. |
| Terminal 2 | Anode/Cathode (bidirectional) | Electrically identical to Terminal 1; symmetrical connection enables flexible PCB layout without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN FD differential pairs) without polarity concerns. |
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces requiring zero-failure reliability under thermal cycling and vibration. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC J-STD-20D; eliminates brominated flame retardants for safer end-of-life processing. |
| Low clamping ratio (VC/VBR) | 1.45 typical (82.4 V / 56.7 V); minimizes let-through energy during surge events compared to higher-ratio alternatives. |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without moisture-induced popcorning; eliminates pre-bake requirement in high-volume SMT lines. |
Applications
| Automotive Sensor Protection | Industrial Analog Input Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and pressure sensor outputs in engine bay ECUs exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across sensor supply and ground pins to shunt surge energy before it reaches precision amplifiers or microcontroller ADC inputs. Use Value: Maintains signal integrity by limiting transient overvoltage to ≤82.4 V, preventing latch-up or gate oxide damage in 5 V tolerant automotive MCUs. | Use Scenario: Safeguarding 4–20 mA current loop receivers and thermocouple amplifier inputs in factory automation PLCs subjected to lightning-induced surges on field wiring. IC Role / Device Role / Timing Role: Primary overvoltage limiter installed at connector entry point, absorbing multi-kW transients before they propagate into isolated signal conditioning stages. Use Value: Withstands repeated 1 kV/500 A surges per IEC 61000-4-5 Level 4, extending system uptime and reducing field return rates. |
| Telecom Power Rail Protection | Consumer USB Port ESD/Surge Protection |
Use Scenario: Guarding -48 V DC telecom power distribution boards against accidental short-circuit recovery spikes and induced surges from nearby AC mains. IC Role / Device Role / Timing Role: High-power crowbar element placed between -48 V rail and chassis ground, activated only during overvoltage fault conditions. Use Value: 1500 W peak power rating ensures survival of 10/1000 µs surges exceeding 1000 V, preserving upstream DC-DC converter reliability. | Use Scenario: Secondary-level surge suppression on USB 2.0 VBUS lines in smart home hubs, complementing primary ESD arrays near connectors. IC Role / Device Role / Timing Role: Bulk energy absorber handling longer-duration transients (e.g., capacitive discharge from human body model >100 ns) that exceed ESD diode limits. Use Value: Clamps 100 A surge to <90 V within nanoseconds, preventing thermal runaway in USB switch ICs rated for 6 V absolute maximum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC51CA | Lower PPPM (500 W), smaller SMA package, higher VC/VBR ratio (1.62) | Limited to lower-energy threats (IEC 61000-4-2 ESD only); unsuitable for IEC 61000-4-5 surge. | Select when board space is constrained and surge threat level is limited to contact ESD. |
| 1.5KE51CA | Through-hole DO-201 package, same VWM/VC, but slower thermal response and no AEC-Q101 qualification. | Not suitable for automotive SMT production or high-reliability industrial environments requiring traceable qualification. | Choose only for legacy through-hole designs or cost-sensitive non-automotive applications where reflow compatibility is not required. |
Compared with SAC51CA and 1.5KE51CA, SMCJ51CAHM3/I provides superior surge robustness (1500 W vs. 500 W or 1500 W with inferior thermal performance), AEC-Q101 validation for automotive use, and SMC package compatibility with modern high-speed SMT lines - making it the preferred choice for new designs targeting functional safety and long-term supply stability.
Availability
SMCJ51CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial analog input modules, and telecom power distribution systems requiring stable component supply and full AEC-Q101 compliance.
Supply support for SMCJ51CAHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where sustained surge immunity and long-term parametric stability are mission-critical.
FAQ
What is the clamping voltage of SMCJ51CAHM3/I at its rated peak pulse current?
The SMCJ51CAHM3/I has a maximum clamping voltage (VC) of 82.4 V when subjected to its rated peak pulse current (IPPM) of 18.2 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees consistent overvoltage limiting behavior across production units. The SMCJ51CAHM3/I's low clamping ratio supports reliable protection of 5 V and 3.3 V logic interfaces in automotive and industrial systems.
Is SMCJ51CAHM3/I qualified for automotive applications?
Yes, SMCJ51CAHM3/I is AEC-Q101 qualified, as indicated by the "HM3" suffix denoting halogen-free, RoHS-compliant, and automotive-grade construction. It undergoes rigorous stress testing including temperature cycling, humidity bias HAST, and mechanical shock to validate suitability for engine control units, ADAS sensors, and infotainment power supplies. The SMCJ51CAHM3/I's qualification documentation is available via Vishay's official product page and distributor portals.
What does the "CA" suffix mean in SMCJ51CAHM3/I?
The "CA" suffix in SMCJ51CAHM3/I denotes a bidirectional configuration, meaning the device provides symmetrical transient suppression in both forward and reverse polarities. Unlike unidirectional variants (e.g., SMCJ51A), the SMCJ51CAHM3/I has no cathode marking and functions identically regardless of voltage polarity - essential for protecting AC-coupled or floating signal paths such as CAN bus lines or transformer-isolated interfaces.
What is the thermal resistance of SMCJ51CAHM3/I from junction to ambient?
The SMCJ51CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB construction and natural convection cooling. For high-power surge duty cycles, thermal derating per Figure 2 in the Vishay datasheet (Document Number: 88394) must be applied to maintain TJ ≤ 150 °C. The SMCJ51CAHM3/I's RθJL of 15 °C/W further supports efficient heat transfer to PCB traces.
How does SMCJ51CAHM3/I differ from SMCJ51A in practical circuit design?
SMCJ51CAHM3/I is bidirectional with no polarity marking, enabling direct placement across floating or AC-coupled nodes like RS-485 differential pairs or transformer secondaries, whereas SMCJ51A is unidirectional and requires correct cathode orientation relative to system ground. The SMCJ51CAHM3/I also exhibits identical VBR, VC, and PPPM specs but lacks forward voltage (VF) specification since it conducts equally in both directions. In automotive CAN FD designs, SMCJ51CAHM3/I eliminates orientation errors during SMT assembly - a key reliability advantage over SMCJ51A.
SMCJ51CAHM3/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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 18.2A
- 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)
SMCJ51CAHM3/I FAQ
1.How can I place an order for SMCJ51CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51CAHM3/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 SMCJ51CAHM3/I reliable?
The price and inventory of SMCJ51CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ51CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ51CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51CAHM3/I?
SMCJ51CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51CAHM3/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 SMCJ51CAHM3/I?
For technical support, including SMCJ51CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51CAHM3/I requirements.
6.How does Aetrix verify that SMCJ51CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ51CAHM3/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 SMCJ51CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ51CAHM3/I?
All SMCJ51CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51CAHM3/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 SMCJ51CAHM3/I part is unused and in its original packaging.
Return procedure for SMCJ51CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51CAHM3/I Tags
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