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Vishay General Semiconductor - Diodes Division SMCJ26CAHM3/I
- Part No.:
- SMCJ26CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ26CAHM3/I.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,097
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Product details
Overview
SMCJ26CAHM3/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 26 V standoff voltage (VWM), 42.1 V maximum clamping voltage (VC) at 35.6 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 SMCJ26CAHM3/I datasheet, SMCJ26CAHM3/I pinout, SMCJ26CAHM3/I application, or SMCJ26CAHM3/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), thermal resistance (RθJA = 75 °C/W), and junction temperature range (–55 °C to +150 °C).
Technical Context
This device operates as a voltage-clamped surge protector with symmetrical breakdown behavior in both polarities due to its bidirectional construction. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1 ns), while the SMC package supports automated placement and meets MSL Level 1 reflow requirements (260 °C peak).
Clamping performance is validated under standardized 10/1000 µs surge waveforms with derating above 25 °C ambient per Fig. 2. The device exhibits a positive temperature coefficient of breakdown voltage (+0.097 %/°C), ensuring predictable voltage shift across operating temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 28.9 V / 31.9 V - Verified breakdown occurs within this band at 1.0 mA test current |
| VC @ IPPM | 42.1 V - Clamped voltage seen by protected circuit during full 1500 W surge event |
| IPPM | 35.6 A - Peak surge current capability under 10/1000 µs waveform with derated thermal conditions |
| PPPM | 1500 W - Peak pulse power handling capacity defining transient energy absorption limit |
| TJ range | –55 °C to +150 °C - Full operational junction temperature range supporting automotive under-hood use |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient, critical for PCB copper pad layout design |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified (HM3 suffix). Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); cathode band absent (bidirectional type).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A | One end of bidirectional PN junction; electrically symmetric with Cathode terminal |
| Cathode | Terminal K | Other end of bidirectional PN junction; no polarity marking on package per spec |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| AEC-Q101 qualification | Validated reliability for automotive applications including engine control, ADAS sensors, and infotainment buses |
| Halogen-free HM3 suffix | Meets strict environmental compliance (IEC 61249-2-21) and JESD201 Class 2 whisker resistance |
| Low incremental surge resistance | Minimizes VC overshoot during fast transients, improving protection margin for downstream ICs |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without moisture-induced failure risk |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly at connector entry point to shunt surge energy before it reaches signal conditioning circuitry. Use Value: Maintains signal integrity under ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-2 ESD (±15 kV air) due to sub-ns response and 42.1 V clamping at 35.6 A. | Use Scenario: Safeguarding PLC digital input modules and fieldbus terminations against induced surges from relay switching and lightning coupling. IC Role / Device Role / Timing Role: Bidirectional transient suppressor mounted across differential pairs or single-ended inputs to clamp common-mode and differential-mode transients. Use Value: Enables robust operation in harsh industrial environments with repeated 1500 W surge exposure, supported by 150 °C max junction temperature rating. |
| Telecom Line Protection | Consumer Power Adapter Input |
Use Scenario: Shielding Ethernet PHY interfaces and PoE injectors from fast-rising transients caused by nearby AC line switching or electrostatic discharge. IC Role / Device Role / Timing Role: Primary-level TVS on RJ45 magnetics secondary side or DC bias feed lines to absorb coupled energy before reaching PHY IC. Use Value: Symmetrical clamping ensures equal protection for both polarities of differential signaling, preserving signal balance and minimizing jitter impact. | Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters and USB PD chargers exposed to mains-borne surges and capacitor discharge events. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after rectification but before bulk capacitor to prevent overvoltage damage to controller ICs and optocouplers. Use Value: 26 V VWM allows compatibility with 24 V nominal output rails while providing 1500 W surge headroom and low leakage (<1.0 µA) to avoid standby power penalty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26CAHM3/I | Lower PPPM (600 W), smaller SMB package (DO-214AA), same VWM/VC specs | Reduced surge energy handling; suitable only for lower-risk consumer-grade interfaces | Select when board space is constrained and surge threat level is limited to IEC 61000-4-5 Level 3 (0.5 kV) |
| SMCJ26AHE3/I | Unidirectional variant, identical VWM/VC/PPPM, commercial-grade (not AEC-Q101), RoHS-compliant E3 suffix | Requires external polarity awareness; not qualified for automotive under-hood deployment | Choose for cost-sensitive industrial applications where AEC-Q101 is unnecessary and unidirectional signal paths exist |
Compared with SMCJ26CAHM3/I, SMBJ26CAHM3/I trades surge robustness for footprint reduction, while SMCJ26AHE3/I sacrifices automotive qualification and bidirectionality for lower unit cost-making the original part uniquely suited for high-reliability, polarity-agnostic, automotive-grade protection.
Availability
SMCJ26CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and telecom line safeguarding requiring stable component supply across extended production lifecycles.
Supply support for SMCJ26CAHM3/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 demanding environments, targeting automotive, industrial, and telecom systems where robustness against ISO 7637, IEC 61000-4-2/4-5, and lightning-induced surges is mandatory.
FAQ
What does the 'CA' suffix indicate in SMCJ26CAHM3/I?
The 'CA' suffix in SMCJ26CAHM3/I denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression in both forward and reverse directions. This eliminates polarity dependency during board layout and enables protection of AC-coupled or floating signal lines. Unlike unidirectional variants (e.g., SMCJ26A), the CA version has no cathode band marking and exhibits matched breakdown characteristics in either polarity, as confirmed in the Vishay datasheet Table on page 2.
Is SMCJ26CAHM3/I qualified for automotive applications?
Yes, SMCJ26CAHM3/I is AEC-Q101 qualified, as indicated by the 'HM3' suffix-where 'H' signifies AEC-Q101 qualification and 'M3' denotes halogen-free, RoHS-compliant construction. This certification validates its reliability under automotive temperature cycling, mechanical shock, and humidity testing per the AEC standard. It is explicitly intended for under-hood and chassis-mounted applications where junction temperatures reach up to +150 °C.
What is the maximum clamping voltage of SMCJ26CAHM3/I and under what test condition?
The maximum clamping voltage (VC) of SMCJ26CAHM3/I is 42.1 V, measured at a peak pulse current (IPPM) of 35.6 A using the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during worst-case transient events, as specified in the Vishay Electrical Characteristics table on page 2 of document 88394.
How does the thermal resistance of SMCJ26CAHM3/I affect PCB layout?
The typical junction-to-ambient thermal resistance (RθJA) of SMCJ26CAHM3/I is 75 °C/W, which directly impacts required copper pad area and thermal vias. To maintain safe junction temperature under sustained 6.5 W power dissipation, the datasheet recommends mounting on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. Reducing pad size increases RθJA, risking thermal runaway during repetitive surges-so layout must strictly follow Vishay's recommended footprint.
Can SMCJ26CAHM3/I be used in place of a unidirectional TVS like SMCJ26AHE3/I?
No-SMCJ26CAHM3/I is not a direct replacement for unidirectional parts like SMCJ26AHE3/I due to fundamental differences in polarity behavior and application context. While both share identical VWM (26 V) and VC (42.1 V), the CA version clamps symmetrically and lacks polarity marking, whereas the A version requires correct cathode orientation and conducts forward current. Substitution would require circuit review to ensure bidirectional operation is acceptable and no forward conduction path exists.
SMCJ26CAHM3/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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 35.6A
- 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)
SMCJ26CAHM3/I FAQ
1.How can I place an order for SMCJ26CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ26CAHM3/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 SMCJ26CAHM3/I reliable?
The price and inventory of SMCJ26CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ26CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ26CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ26CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ26CAHM3/I?
SMCJ26CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ26CAHM3/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 SMCJ26CAHM3/I?
For technical support, including SMCJ26CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ26CAHM3/I requirements.
6.How does Aetrix verify that SMCJ26CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ26CAHM3/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 SMCJ26CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ26CAHM3/I?
All SMCJ26CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ26CAHM3/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 SMCJ26CAHM3/I part is unused and in its original packaging.
Return procedure for SMCJ26CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ26CAHM3/I Tags
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