My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ51CAHM3_A/I
- Part No.:
- SMCJ51CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51CAHM3_A/I.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,847
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ51CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge 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 (10/1000 µs waveform), commonly deployed on automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SMCJ51CAHM3_A/I datasheet, SMCJ51CAHM3_A/I pinout, SMCJ51CAHM3_A/I application, or SMCJ51CAHM3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and thermal resistance (RθJA = 75 °C/W) under standard PCB pad layout.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown characteristics in both directions (VBR min = 56.7 V, VBR max = 62.7 V at IT = 1 mA), enabling robust protection against ESD, lightning-induced transients, and inductive switching spikes without polarity sensitivity. Its glass-passivated junction ensures stable leakage (<1 µA at VWM) and fast response time (<1 ns).
Thermally, it supports continuous operation up to TJ = 150 °C and delivers 6.5 W power dissipation at TA = 50 °C on infinite heatsink. The SMC package provides low incremental surge resistance and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum reverse working voltage before clamping begins; defines safe operating range for protected circuit. |
| VC @ IPPM | 82.4 V - Clamped voltage during 18.2 A 10/1000 µs surge; determines maximum stress on downstream ICs. |
| PPPM | 1500 W - Peak pulse power handling capacity; enables protection against high-energy transients like ISO 7637-2 Pulse 5a. |
| IPPM | 18.2 A - Peak surge current supported at rated clamping voltage; correlates directly with system-level surge test margin. |
| TJ max | +150 °C - Maximum junction temperature; allows reliable operation in under-hood automotive environments. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads; informs board-level thermal design. |
| Package | SMC (DO-214AB) - Surface-mount package with 2.06 mm height and 7.75 mm body length; compatible with automated placement and reflow. |
Pinout & Package
SMCJ51CAHM3_A/I uses a 2-terminal SMC (DO-214AB) package with no polarity marking (bidirectional configuration). Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker test requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Provides symmetrical conduction path during positive or negative voltage excursions beyond VBR. |
| Cathode | Transient return path (bidirectional) | Functionally identical to Anode in CA-series devices; no cathode band marking required. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces per stress test requirements. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance mandates for Tier 1 automotive suppliers and industrial OEMs with strict material restrictions. |
| 1500 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV line-earth, 2 kV line-line) surge immunity without external series impedance. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio TVS devices, preserving signal integrity. |
| MSL Level 1 moisture sensitivity | Enables standard SMT assembly without dry-pack or baking, reducing manufacturing overhead and yield risk. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and jump-start transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Voltage-clamping transient suppressor placed directly at connector interface, acting as first-line defense before signal conditioning circuitry. Use Value: Maintains <1 µA leakage at 51 V while clamping 18.2 A surges to ≤82.4 V, preventing latch-up or damage to 5 V or 3.3 V microcontrollers. | Use Scenario: Safeguarding digital input/output channels of programmable logic controllers against field-wiring induced surges in factory automation environments. IC Role / Device Role / Timing Role: Bidirectional shunt protector across isolated 24 V DC I/O lines, absorbing energy from relay coil flyback and ESD events. Use Value: Delivers 1500 W surge rating with symmetric clamping, eliminating need for dual unidirectional devices and simplifying BOM management. |
| Telecom Line Interface Protection | Consumer Power Adapter ESD Protection |
Use Scenario: Shielding Ethernet PHY interfaces and PoE injectors from lightning-induced surges on outdoor cabling in enterprise networking equipment. IC Role / Device Role / Timing Role: Primary surge suppression element on RJ45 jack side, coordinated with secondary GDT or polymer PTC for multi-stage protection. Use Value: Fast <1 ns response ensures clamping occurs before transient propagates into magnetics or PHY IC, preserving data integrity during surge events. | Use Scenario: Adding robust ESD immunity to USB-C and barrel-jack power inputs of smart home hubs and audio amplifiers subjected to user-handling discharge. IC Role / Device Role / Timing Role: Secondary-level TVS placed after fuse and upstream of DC-DC converter, targeting IEC 61000-4-2 ±15 kV contact discharge. Use Value: Halogen-free HM3 construction satisfies UL/IEC safety certifications for consumer end-products, while 82.4 V clamping avoids overvoltage stress on 12 V input rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51CA-E3/57T | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), non-AEC-Q101, RoHS-compliant only (E3) | Not suitable for automotive under-hood use; limited to low-energy consumer or office equipment. | Select when space-constrained layouts prioritize size over surge rating and automotive qualification. |
| SMCJ51CAHE3_A/I | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant commercial grade (HE3) instead of halogen-free (HM3); same SMC package and pinout. | Acceptable for non-halogen-restricted automotive programs; not compliant with EU automotive material declarations requiring halogen-free content. | Choose when halogen-free requirement is waived but AEC-Q101 and 1500 W rating remain mandatory. |
Compared with SMCJ51CAHM3_A/I, SMAJ51CA-E3/57T offers reduced surge capability and no automotive qualification, while SMCJ51CAHE3_A/I matches performance but lacks halogen-free certification-making SMCJ51CAHM3_A/I the sole option meeting full AEC-Q101 + halogen-free + 1500 W requirements.
Availability
SMCJ51CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line interfaces, and consumer power adapter designs requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ51CAHM3_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 and application-specific performance.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, high PPPM, and stable clamping are critical.
FAQ
What does the "CA" suffix indicate in SMCJ51CAHM3_A/I?
The "CA" suffix denotes a bidirectional configuration, meaning SMCJ51CAHM3_A/I provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMCJ51A), it has no cathode marking and exhibits identical breakdown and clamping behavior in either direction-ideal for AC-coupled or differential signal lines.
Is SMCJ51CAHM3_A/I qualified for automotive use?
Yes, SMCJ51CAHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure (HM3 suffix indicates halogen-free + AEC-Q101). This qualification covers stress tests including HTGB, HTRB, TCT, and mechanical shock, validating its suitability for engine control units, ADAS sensors, and infotainment systems in passenger vehicles.
How does the HM3 suffix differ from HE3 in SMCJ51CAHM3_A/I?
The HM3 suffix in SMCJ51CAHM3_A/I specifies halogen-free, RoHS-compliant, and AEC-Q101-qualified construction, whereas HE3 denotes RoHS-compliant and AEC-Q101-qualified but not halogen-free. Both share identical electrical specs and SMC packaging, but HM3 meets stricter material declarations required by EU automotive OEMs and green electronics initiatives.
What is the maximum clamping voltage of SMCJ51CAHM3_A/I under surge conditions?
The maximum clamping voltage (VC) of SMCJ51CAHM3_A/I is 82.4 V at 18.2 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and represents the upper limit of voltage seen by protected circuitry during worst-case surge events, ensuring compatibility with 5 V–12 V logic and interface ICs.
Can SMCJ51CAHM3_A/I be used in place of a unidirectional TVS like SMCJ51A?
No-SMCJ51CAHM3_A/I is bidirectional and lacks polarity marking, making it unsuitable as a direct replacement for unidirectional SMCJ51A in DC-biased circuits. Using it in place of SMCJ51A would expose protected components to forward conduction during normal operation. Always verify circuit topology: bidirectional TVS devices require AC-coupled or floating signal paths.
SMCJ51CAHM3_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):
- 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/I FAQ
1.How can I place an order for SMCJ51CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51CAHM3_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 SMCJ51CAHM3_A/I reliable?
The price and inventory of SMCJ51CAHM3_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 SMCJ51CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ51CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51CAHM3_A/I?
SMCJ51CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51CAHM3_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 SMCJ51CAHM3_A/I?
For technical support, including SMCJ51CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51CAHM3_A/I requirements.
6.How does Aetrix verify that SMCJ51CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ51CAHM3_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 SMCJ51CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ51CAHM3_A/I?
All SMCJ51CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51CAHM3_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 SMCJ51CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ51CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51CAHM3_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 …
