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Vishay General Semiconductor - Diodes Division SMCJ51CAHM3_A/H
- Part No.:
- SMCJ51CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51CAHM3_A/H.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,231
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Product details
Overview
SMCJ51CAHM3_A/H 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 at 18.2 A peak pulse current (IPPM), and 1500 W peak pulse power dissipation with 10/1000 μs waveform - deployed in automotive sensor signal lines, industrial I/O ports, and telecom interface protection.
For engineers reviewing the SMCJ51CAHM3_A/H datasheet, SMCJ51CAHM3_A/H pinout, SMCJ51CAHM3_A/H application, or SMCJ51CAHM3_A/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 75 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during transients: when reverse voltage exceeds its breakdown range (56.7–62.7 V at 1 mA), it switches to low-impedance conduction within <1 ps, limiting downstream voltage to ≤82.4 V at 18.2 A. Its glass-passivated junction ensures stable leakage (<1 μA at 51 V) and repeatable clamping performance across -55 °C to +150 °C junction temperature.
The SMCJ51CAHM3_A/H is engineered for unclamped inductive switching events (e.g., relay coil flyback, motor commutation) and lightning-induced surges per IEC 61000-4-5. Its bidirectional architecture eliminates polarity concerns in AC-coupled or differential signal paths, while MSL Level 1 rating supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe signal swing margin in protected circuit. |
| VBR min/max | 56.7 V / 62.7 V at 1 mA - Verified breakdown threshold range ensuring consistent turn-on across production lot and temperature. |
| VC @ IPPM | 82.4 V at 18.2 A - Clamped voltage under 10/1000 μs surge; determines maximum stress imposed on downstream ICs or MOSFETs. |
| PPPM | 1500 W - Peak transient energy handling capacity; enables protection against high-energy ESD and surge events per ISO 16750-2. |
| ID @ VWM | ≤1 μA - Ultra-low reverse leakage preserves signal integrity and battery life in always-on sensor nodes. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and enclosed industrial enclosures without derating. |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient on standard 8 mm × 8 mm pads; informs heatsinking requirements for sustained surge duty cycles. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); matte tin-plated leads solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; common node for bidirectional clamping path | Connected to protected line (e.g., CAN_H, RS-485 A); no polarity marking required for bidirectional function. |
| Cathode | Current exit terminal in forward bias; symmetric counterpart to anode in bidirectional mode | Connected to same protected line (e.g., CAN_L, RS-485 B); forms symmetrical clamp between terminals - no cathode band marking. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Equal VBR and VC in both directions - eliminates need for polarity-aware layout in differential or AC signal paths. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, UHAST, and mechanical shock - suitable for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS | Meets JEDEC J-STD-203 and EU RoHS Directive 2011/65/EU - supports green manufacturing and end-of-life compliance. |
| Low incremental surge resistance | Enables tighter VC tolerance and faster voltage stabilization during multi-pulse surge events (e.g., ISO 7637-2 Pulse 5a). |
| MSL Level 1 | Unlimited floor life at ≤30 °C/60% RH; withstands JEDEC-standard lead-free reflow profile with 260 °C peak. |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across sensor output and ground to shunt transients before reaching ADC input or signal conditioner. Use Value: Maintains signal fidelity below 51 V DC offset while clamping spikes to ≤82.4 V - prevents ADC saturation and latch-up in downstream microcontrollers. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers (e.g., SN65HVD230) in factory automation PLC backplanes subject to cable ESD and ground loop surges. IC Role / Device Role / Timing Role: Differential-line TVS connected between A and B bus lines to suppress common-mode transients without distorting data eye. Use Value: Symmetric 56.7–62.7 V breakdown ensures equal clamping on both lines - preserves differential voltage margin and avoids false logic transitions. |
| Telecom DSL Line Protection | Consumer USB Port ESD Suppression |
Use Scenario: Front-end protection of ADSL/VDSL line drivers and receivers in residential gateways subjected to lightning-induced longitudinal surges on twisted-pair lines. IC Role / Device Role / Timing Role: Bidirectional TVS installed between tip/ring conductors to clamp mode-converted surges before transformer coupling. Use Value: 1500 W PPPM rating handles IEC 61000-4-5 Level 4 (4 kV) surges; 82.4 V VC limits stress on isolation transformers and PHY ICs. |
Use Scenario: ESD safeguard for USB 2.0 D+/D− lines in portable media players where space-constrained layout prohibits discrete capacitor+TVS solutions. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp integrated directly at USB connector to absorb ±15 kV contact discharge per IEC 61000-4-2. Use Value: Sub-1 μA leakage at 51 V prevents pull-up resistor loading; fast response (<1 ps) prevents ESD-induced bit errors or enumeration failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51CAHE3_A/H | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Not suitable for >1 kV surge environments; limited to consumer-grade USB or low-energy I/O | Select only when board space is critical and surge threat level is ≤IEC 61000-4-2 Level 2. |
| SMCJ51AHE3_A/H | Unidirectional variant; includes cathode band marking; identical VWM, VC, and PPPM but asymmetric clamping | Requires polarity-aware routing; unsuitable for AC or differential signals without external diode pairing | Choose only for DC-biased single-ended lines (e.g., 12 V supply rail) where reverse conduction must be blocked. |
Compared with SMAJ51CAHE3_A/H and SMCJ51AHE3_A/H, the SMCJ51CAHM3_A/H delivers higher surge robustness in the same footprint, AEC-Q101 qualification for automotive use, and halogen-free construction - making it the preferred choice for industrial and automotive designs requiring long-term reliability under repetitive surge stress.
Availability
SMCJ51CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial RS-485 networks, telecom DSL line cards, and consumer USB host devices requiring stable component supply across extended product lifecycles.
Supply support for SMCJ51CAHM3_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 part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be mitigated without compromising signal integrity.
FAQ
What does the "CA" suffix indicate in SMCJ51CAHM3_A/H?
The "CA" suffix denotes a bidirectional configuration - meaning the SMCJ51CAHM3_A/H provides symmetrical transient voltage suppression in both polarities, with identical breakdown (56.7–62.7 V) and clamping (82.4 V) characteristics across its two terminals. This eliminates polarity marking and simplifies layout for AC-coupled or differential interfaces like RS-485 or CAN, unlike unidirectional variants such as SMCJ51AHE3_A/H.
Is SMCJ51CAHM3_A/H qualified for automotive applications?
Yes, SMCJ51CAHM3_A/H is AEC-Q101 qualified, verified per stress tests including high-temperature operating life (HTOL), temperature cycling (TC), unbiased highly accelerated stress test (UHAST), and mechanical shock. Its halogen-free, RoHS-compliant construction and MSL Level 1 rating further support use in engine control units, ADAS camera modules, and body electronics where long-term reliability under thermal and vibration stress is mandatory.
How does the 1500 W peak pulse power rating of SMCJ51CAHM3_A/H translate to real-world surge protection?
The 1500 W rating for SMCJ51CAHM3_A/H is specified at the standardized 10/1000 μs double-exponential surge waveform - matching IEC 61000-4-5 test conditions. At 51 V standoff, this enables clamping of up to 18.2 A surge current while limiting voltage to 82.4 V, protecting downstream components such as RS-485 transceivers or automotive sensor signal conditioners from damage during load dump or lightning-induced transients.
What is the significance of the "HM3" suffix in SMCJ51CAHM3_A/H?
The "HM3" suffix in SMCJ51CAHM3_A/H indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing it from commercial-grade "E3" or "M3" variants. It meets JEDEC J-STD-203 for halogen content (<900 ppm Br, <900 ppm Cl) and supports environmentally regulated markets while maintaining full automotive reliability validation, unlike non-H variants which lack AEC-Q101 certification.
Can SMCJ51CAHM3_A/H be used in place of unidirectional TVS diodes like SMCJ51AHE3_A/H?
No - SMCJ51CAHM3_A/H is strictly bidirectional and lacks polarity marking, so it cannot replace unidirectional types like SMCJ51AHE3_A/H in DC-biased circuits where reverse conduction must be blocked (e.g., 12 V supply rail protection). Substituting it would allow unintended reverse current flow. For bidirectional signal paths (e.g., CAN, RS-485), however, SMCJ51CAHM3_A/H is the correct and optimized choice due to its symmetrical clamping behavior.
SMCJ51CAHM3_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):
- 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_A/H FAQ
1.How can I place an order for SMCJ51CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51CAHM3_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 SMCJ51CAHM3_A/H reliable?
The price and inventory of SMCJ51CAHM3_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 SMCJ51CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ51CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51CAHM3_A/H?
SMCJ51CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51CAHM3_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 SMCJ51CAHM3_A/H?
For technical support, including SMCJ51CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51CAHM3_A/H requirements.
6.How does Aetrix verify that SMCJ51CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ51CAHM3_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 SMCJ51CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ51CAHM3_A/H?
All SMCJ51CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51CAHM3_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 SMCJ51CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMCJ51CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51CAHM3_A/H Tags
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