My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ40CAHM3_A/I
- Part No.:
- SMCJ40CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40CAHM3_A/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,525
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ40CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 40 V standoff voltage, 1500 W peak pulse power rating, and 64.5 V maximum clamping voltage at 23.3 A peak pulse current. It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMCJ40CAHM3_A/I datasheet, SMCJ40CAHM3_A/I pinout, SMCJ40CAHM3_A/I application, or SMCJ40CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and thermal resistance of 75 °C/W junction-to-ambient under standard pad layout.
Technical Context
This device operates as a voltage-clamped transient protector using an avalanche breakdown mechanism, with symmetrical bidirectional behavior enabling suppression of both positive and negative polarity transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at 40 V).
Designed for 10/1000 μs waveform surge immunity, it delivers 23.3 A peak pulse current while maintaining clamping below 64.5 V - critical for safeguarding 3.3 V/5 V/12 V logic interfaces and power rails. Thermal performance is defined by RθJA = 75 °C/W on 8.0 mm × 8.0 mm copper pads, supporting operation up to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for 40 V nominal systems. |
| VBR min/max | 44.4 V / 49.1 V - Measured at 1 mA test current; ensures reliable, repeatable breakdown onset across production lots. |
| VC @ IPPM | 64.5 V - Clamping voltage at 23.3 A peak pulse; limits downstream voltage stress during ESD or lightning-induced surges. |
| PPPM | 1500 W - Peak pulse power handling for 10/1000 μs waveform; enables robust protection against IEC 61000-4-5 Level 4 surges. |
| TJ max | +150 °C - Maximum junction temperature; supports under-hood automotive and high-temperature industrial environments. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8 mm × 8 mm pads; informs heatsinking requirements for sustained surge duty cycles. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. No polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge current during negative transients; symmetrical with cathode for bidirectional operation. |
| Cathode | Transient current entry (positive polarity) | Accepts forward surge current during positive transients; identical electrical behavior to anode due to bidirectional design. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns - eliminates need for dual unidirectional devices. |
| AEC-Q101 qualification | Validates reliability for automotive powertrain, body control, and ADAS modules where field failure risk must be minimized. |
| 1500 W peak pulse power | Supports IEC 61000-4-5 4 kV/2 Ω surge testing with margin, protecting against load dump and inductive switching events. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD), improving protection fidelity for high-speed digital interfaces. |
| MSL Level 1 (260 °C) | Allows standard reflow assembly without moisture sensitivity precautions - reduces manufacturing complexity and cost. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protecting 12 V/24 V power inputs in body control modules from load dump and alternator transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤64.5 V, preventing latch-up or permanent damage to downstream 3.3 V/5 V logic circuitry. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) in factory automation sensors from EFT and surge coupling. IC Role / Device Role / Timing Role: Bidirectional shunt protector across signal and return paths to suppress common-mode and differential transients. Use Value: Maintains signal integrity by clamping transients within ±64.5 V while adding <1.0 μA leakage at 40 V operating bias. |
| Telecom Power Feeds | Consumer Device USB Ports |
Use Scenario: Safeguarding PoE (Power over Ethernet) midspan injectors and splitters against induced lightning surges on DC feed lines. IC Role / Device Role / Timing Role: High-power TVS placed at DC input terminals to absorb multi-kW surge energy before reaching isolation transformers. Use Value: Handles 1500 W peak pulses without degradation, preserving system uptime in outdoor telecom infrastructure. | Use Scenario: Adding secondary-level surge protection on VBUS lines of USB-C ports in laptops and docking stations. IC Role / Device Role / Timing Role: Fast-response clamp between VBUS and GND to suppress contact ESD and hot-plug transients. Use Value: Responds in picoseconds to clamp 8 kV contact ESD to <64.5 V, meeting IEC 61000-4-2 Level 4 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CAHM3_A/I | Lower PPPM (600 W), smaller SMB (DO-214AA) package, same VWM/VC ratings. | Suitable for space-constrained consumer designs with lower surge threat levels (IEC 61000-4-5 Level 2). | Select when board area is limited and peak surge energy does not exceed 600 W. |
| SMCJ40CAHE3_A/I | Same electrical specs and package, but RoHS-compliant commercial grade (non-halogen-free, non-AEC-Q101). | Applicable in non-automotive industrial or computing applications where halogen-free and automotive qualification are not required. | Choose for cost-sensitive commercial designs lacking automotive or green material mandates. |
Compared with SMCJ40CAHM3_A/I, SMBJ40CAHM3_A/I offers reduced surge capacity in a smaller footprint, while SMCJ40CAHE3_A/I provides identical protection performance without halogen-free or AEC-Q101 compliance - enabling trade-offs between reliability, environmental compliance, and cost.
Availability
SMCJ40CAHM3_A/I is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, and telecom power feed applications requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ40CAHM3_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 high-reliability and automotive-grade solutions.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where robustness against load dump, EFT, and lightning-induced surges is mandatory.
FAQ
What is the clamping voltage of the SMCJ40CAHM3_A/I under maximum rated surge current?
The SMCJ40CAHM3_A/I clamps to a maximum of 64.5 V at its rated peak pulse current of 23.3 A (10/1000 μs waveform). This value is guaranteed across temperature and production lot variations per Vishay's datasheet Document Number 88394, ensuring consistent overvoltage protection for downstream 40 V-rated circuits.
Is the SMCJ40CAHM3_A/I suitable for automotive applications?
Yes, the SMCJ40CAHM3_A/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It is explicitly intended for use in automotive power distribution, body electronics, and ADAS subsystems where validated reliability under temperature cycling and surge stress is required.
How does the bidirectional configuration of SMCJ40CAHM3_A/I affect PCB layout?
The SMCJ40CAHM3_A/I has no polarity marking and functions identically in both directions, simplifying PCB layout by eliminating orientation constraints. Unlike unidirectional TVS diodes, it can be placed across any two nodes requiring symmetrical transient suppression - such as differential signal pairs or floating DC rails - without concern for anode/cathode alignment.
What is the thermal resistance of SMCJ40CAHM3_A/I, and how does it impact derating?
The SMCJ40CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per JEDEC standards. At ambient temperatures above 25 °C, its peak pulse power must be linearly derated - for example, to ~1125 W at 75 °C ambient - to maintain junction temperature ≤150 °C.
Does the SMCJ40CAHM3_A/I meet UL recognition requirements?
Yes, the SMCJ40CAHM3_A/I carries Underwriters Laboratories recognition under file number E136766 for both unidirectional and bidirectional configurations, complying with UL 497B for signal and power line protectors. This certification validates its safety performance in end-equipment requiring UL listing, including industrial controls and telecom infrastructure.
SMCJ40CAHM3_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):
- 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_A/I FAQ
1.How can I place an order for SMCJ40CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40CAHM3_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 SMCJ40CAHM3_A/I reliable?
The price and inventory of SMCJ40CAHM3_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 SMCJ40CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ40CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40CAHM3_A/I?
SMCJ40CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40CAHM3_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 SMCJ40CAHM3_A/I?
For technical support, including SMCJ40CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40CAHM3_A/I requirements.
6.How does Aetrix verify that SMCJ40CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ40CAHM3_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 SMCJ40CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ40CAHM3_A/I?
All SMCJ40CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40CAHM3_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 SMCJ40CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ40CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40CAHM3_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 …
