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Vishay General Semiconductor - Diodes Division SMCJ40CAHM3/H
- Part No.:
- SMCJ40CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40CAHM3/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,863
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Product details
Overview
SMCJ40CAHM3/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 40 V standoff voltage (VWM), 64.5 V maximum clamping voltage (VC) at 23.3 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial motor drives.
For engineers reviewing the SMCJ40CAHM3/H datasheet, SMCJ40CAHM3/H pinout, SMCJ40CAHM3/H application, or SMCJ40CAHM3/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, halogen-free RoHS compliance, and thermal resistance (RθJA = 75 °C/W) for board-level surge immunity validation.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown mechanism, delivering symmetrical reverse/forward conduction for bidirectional transients. Its glass-passivated junction ensures stable breakdown characteristics across -55 °C to +150 °C operating range, and its low incremental surge resistance enables fast response (<1 ns) to ESD and lightning-induced surges.
The SMCJ40CAHM3/H is rated for 1500 W peak pulse power under standardized 10/1000 μs waveform, with clamping performance validated at 23.3 A IPPM. Its 75 °C/W junction-to-ambient thermal resistance requires minimum 8.0 mm × 8.0 mm copper pad area per terminal for full power derating per Vishay's layout guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse working voltage before clamping initiates |
| VBR (min/max) | 44.4 V / 49.1 V - Breakdown voltage range at 1 mA test current; defines clamping onset threshold |
| VC @ IPPM | 64.5 V - Clamped voltage at 23.3 A peak pulse current; determines protected circuit stress level |
| PPPM | 1500 W - Peak transient power handling capability with 10/1000 μs waveform |
| ID @ VWM | 1.0 μA - Reverse leakage at 40 V; ensures minimal standby power loss |
| TJ max. | +150 °C - Maximum junction temperature; supports under-hood automotive operation |
| RθJA | 75 °C/W - Thermal resistance requiring defined PCB copper area for thermal management |
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 |
|---|---|---|
| Cathode (marked end) | Reference node for unidirectional devices; unused polarity marker for bidirectional types | No functional polarity - bidirectional conduction means either terminal serves as anode/cathode depending on transient polarity |
| Anode (unmarked end) | Complementary terminal to cathode | Electrically identical to cathode in SMCJ40CAHM3/H; symmetric I-V curve enables AC-coupled line protection without orientation constraints |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per JESD22 standards |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets automotive environmental requirements and EU Directive 2011/65/EU without brominated flame retardants |
| Low incremental surge resistance | Enables tighter clamping (64.5 V at 23.3 A) versus higher-resistance TVS devices, reducing voltage overshoot on protected ICs |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
| Glass passivated junction | Ensures long-term parameter stability and reduced parameter drift over temperature and lifetime |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in engine control units against load dump and jump-start transients. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly at power entry point to shunt >100 V spikes within nanoseconds. Use Value: Withstands 1500 W surges while clamping to ≤64.5 V, preventing MCU brownout or latch-up during ISO 7637-2 Pulse 5a events. | Use Scenario: Safeguarding analog outputs of pressure sensors connected to PLC analog input modules exposed to field wiring noise. IC Role / Device Role / Timing Role: Bidirectional clamping element on 4–20 mA current loop lines to absorb induced common-mode transients. Use Value: Symmetrical VBR (44.4–49.1 V) and VC (64.5 V) ensure equal protection for positive/negative surges without polarity-sensitive placement. |
| Telecom Line Interface Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Shielding Ethernet PHY interface power pins (e.g., MDI-X) from ESD and induced surges in PoE-powered network equipment. IC Role / Device Role / Timing Role: Secondary-level TVS placed after primary gas discharge tube (GDT) to refine clamping and limit let-through voltage. Use Value: Low 1.0 μA leakage at 40 V minimizes quiescent current impact on always-on PHY circuits; 75 °C/W RθJA allows compact layout near connector. | Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, blenders). IC Role / Device Role / Timing Role: Across-motor terminals to clamp inductive kickback and prevent MOSFET drain-source overvoltage. Use Value: 231 V breakdown upper limit (per family spec) ensures compatibility with higher-voltage variants; 1500 W PPPM handles repetitive switching surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC40CA | Same VWM (40 V) and PPPM (1500 W), but SOD-123FL package (smaller, lower power dissipation) | Limited to lower-energy transients due to higher RθJA (~125 °C/W); unsuitable for sustained surge duty cycles | Select only for space-constrained consumer designs where peak surge energy is <50% of SMCJ40CAHM3/H rating |
| SMCJ40CAHE3/H | Identical electrical specs and SMC package, but RoHS-compliant commercial grade (non-halogen-free, non-AEC-Q101) | Lacks automotive qualification and halogen-free certification; not approved for under-hood or safety-critical systems | Choose for cost-sensitive industrial or computing applications where AEC-Q101 and halogen-free status are not required |
Compared with SAC40CA and SMCJ40CAHE3/H, the SMCJ40CAHM3/H uniquely combines AEC-Q101 qualification, halogen-free construction, and full 1500 W surge capability in the robust SMC package - making it the only option qualified for automotive power rail protection with zero material compliance trade-offs.
Availability
SMCJ40CAHM3/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom line protection requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ40CAHM3/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 and automotive-grade qualification.
The SMCJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure tolerance and long-term parametric stability are critical.
FAQ
What does the "HM3" suffix indicate in SMCJ40CAHM3/H?
The HM3 suffix in SMCJ40CAHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with automotive environmental standards and material restrictions, distinguishing it from commercial-grade variants like SMCJ40CAHE3/H. This makes SMCJ40CAHM3/H suitable for under-hood and safety-critical applications where both reliability and regulatory compliance are mandatory.
Is SMCJ40CAHM3/H bidirectional, and how does that affect PCB layout?
Yes, SMCJ40CAHM3/H is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients without polarity dependence. Unlike unidirectional variants, it has no cathode marking and can be placed in either orientation on the PCB - simplifying layout and eliminating orientation errors during automated assembly. This feature is essential for protecting AC-coupled or differential signal lines.
What is the maximum clamping voltage of SMCJ40CAHM3/H, and at what current is it specified?
The maximum clamping voltage (VC) of SMCJ40CAHM3/H is 64.5 V, measured at a peak pulse current (IPPM) of 23.3 A under the standard 10/1000 μs waveform. This value defines the highest voltage imposed on the protected circuit during a worst-case surge event and is critical for ensuring downstream components remain within their absolute maximum ratings.
Does SMCJ40CAHM3/H require heatsinking for full 1500 W surge capability?
SMCJ40CAHM3/H does not require external heatsinking for single-event 1500 W surges, but its thermal performance depends on PCB layout. Vishay specifies full power rating when mounted on 8.0 mm × 8.0 mm copper pads per terminal. Without this copper area, power derating applies per Figure 2 in the datasheet - so proper pad design is essential to maintain clamping performance during repeated or high-duty-cycle transients.
How does SMCJ40CAHM3/H differ from SMCJ40A in terms of electrical behavior?
SMCJ40CAHM3/H is bidirectional with symmetrical breakdown and clamping in both directions, while SMCJ40A is unidirectional and conducts only in reverse bias. The "CA" suffix explicitly denotes bidirectional functionality - critical for protecting AC signals or floating nodes. Additionally, SMCJ40CAHM3/H carries AEC-Q101 qualification and halogen-free materials, whereas SMCJ40A variants may lack these certifications unless explicitly ordered with HM3/HE3 suffixes.
SMCJ40CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 23.3A
- 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)
SMCJ40CAHM3/H FAQ
1.How can I place an order for SMCJ40CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40CAHM3/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 SMCJ40CAHM3/H reliable?
The price and inventory of SMCJ40CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ40CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40CAHM3/H?
SMCJ40CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40CAHM3/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 SMCJ40CAHM3/H?
For technical support, including SMCJ40CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40CAHM3/H requirements.
6.How does Aetrix verify that SMCJ40CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ40CAHM3/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 SMCJ40CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMCJ40CAHM3/H?
All SMCJ40CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40CAHM3/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 SMCJ40CAHM3/H part is unused and in its original packaging.
Return procedure for SMCJ40CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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