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Vishay General Semiconductor - Diodes Division SMAJ40CAHM3_A/I
- Part No.:
- SMAJ40CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40CAHM3_A/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,589
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Product details
Overview
SMAJ40CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 40 V standoff voltage (VWM), 44.4–49.1 V breakdown voltage (VBR) at 1 mA, 64.5 V maximum clamping voltage (VC) at 6.2 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - suitable for protecting MOSFETs, ICs, and sensor signal lines in automotive and industrial power rails.
For engineers reviewing the SMAJ40CAHM3_A/I datasheet, SMAJ40CAHM3_A/I pinout, SMAJ40CAHM3_A/I application, or SMAJ40CAHM3_A/I equivalent, this device delivers verified AEC-Q101 qualification, halogen-free RoHS compliance, MSL Level 1 moisture sensitivity, and low incremental surge resistance - critical for high-reliability ESD and load-switching transient suppression in space-constrained surface-mount designs.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling clamping during positive and negative transients without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ps), while the SMA package supports automated placement and meets UL 94 V-0 flammability requirements.
The device is rated for 400 W peak pulse power (derated to 300 W above 78 V), with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It sustains 40 A non-repetitive forward surge current (8.3 ms half-sine) and operates across –55 °C to +150 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering under transient stress. |
| VC @ IPPM | 64.5 V at 6.2 A - Clamped voltage during 10/1000 μs surge; limits downstream component stress to safe levels. |
| PPPM | 400 W - Peak pulse power handling capability; supports high-energy transients like ISO 7637-2 Pulse 1/2a/5a. |
| IFSM | 40 A - Non-repetitive forward surge current rating; validates robustness against inductive kickback events. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint; compatible with standard reflow profiles. |
Pinout & Package
Package: SMA (DO-214AC), bidirectional configuration with no polarity marking; symmetrical two-terminal construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (bidirectional) | Transient conduction path | Both terminals function identically; conducts during either polarity surge - no cathode band marking required. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for modern automotive and industrial supply chains (HM3 suffix). |
| MSL Level 1 | Unlimited floor life at ≤30 °C/85 % RH; eliminates bake-out requirement prior to reflow soldering. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic interfaces. |
| Glass passivated junction | Ensures long-term parameter stability and reduced leakage drift over temperature and lifetime. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppresses load-dump transients (ISO 7637-2 Pulse 5a) on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between power rail and ground, responding within picoseconds to overvoltage events. Use Value: Limits peak rail voltage to ≤64.5 V during 35 V/100 ms load dump, preventing damage to 40 V-rated DC-DC controllers and microcontrollers. |
Use Scenario: Shields analog and digital signal lines (e.g., CAN, LIN, I²C) from ESD and inductive switching noise in factory automation sensors. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF at 0 V) bidirectional shunt clamp on differential or single-ended data paths. Use Value: Clamps ±15 kV contact ESD (IEC 61000-4-2) to <±25 V, preserving signal integrity and avoiding latch-up in precision ADC front-ends. |
| Consumer Power Adapter Input Protection | Telecom DC Power Feed Protection |
Use Scenario: Protects primary-side rectifier and controller ICs in universal-input AC-DC adapters against surges from mains transients (IEC 61000-4-5). IC Role / Device Role / Timing Role: Secondary-level TVS placed across bulk capacitor input, triggered after MOV clamping to handle residual energy. Use Value: Absorbs 400 W surge energy without degradation, maintaining system uptime and reducing need for oversized upstream components. |
Use Scenario: Safeguards PoE-powered equipment (IEEE 802.3af/at) from induced surges on 48 V DC feed lines in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Bidirectional clamp on each conductor pair, referenced to local ground plane to suppress common-mode transients. Use Value: Withstands repeated 10/1000 μs surges up to 6.2 A while maintaining VWM = 40 V margin above nominal 48 V supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40CAHE3_A/I | Same electrical specs but RoHS-compliant without halogen-free certification (E3 vs HM3). | Acceptable for commercial/industrial use where halogen-free is not mandated; not AEC-Q101 qualified. | Select when automotive qualification is unnecessary and cost optimization is prioritized. |
| SMBJ40CAHM3_A/I | Same VWM/VC ratings but SMB package (DO-214AA); 600 W PPPM, higher IPPM (10.3 A). | Better suited for higher-energy transients; larger footprint may conflict with dense PCB layouts. | Choose when surge energy exceeds 400 W and board space allows SMB's 7.11 mm × 6.22 mm outline. |
Compared with SMAJ40CAHE3_A/I, the SMAJ40CAHM3_A/I adds halogen-free compliance and AEC-Q101 qualification for automotive use; versus SMBJ40CAHM3_A/I, it trades 200 W higher pulse power for 30 % smaller PCB area - optimizing for space-constrained, automotive-grade protection.
Availability
SMAJ40CAHM3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer power adapters, and telecom DC feeds requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ40CAHM3_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 SMAJ series is engineered for high-speed transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness, small size, and qualification compliance are mandatory.
FAQ
What is the clamping voltage of SMAJ40CAHM3_A/I at its rated peak pulse current?
The SMAJ40CAHM3_A/I has a maximum clamping voltage (VC) of 64.5 V at 6.2 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ40CAHM3_A/I maintains this clamping performance across its full operating temperature range and after repeated surge exposures.
Is SMAJ40CAHM3_A/I suitable for automotive applications?
Yes, SMAJ40CAHM3_A/I is AEC-Q101 qualified and specifically designated for automotive use via the HM3 suffix. It undergoes rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD validation per JESD47. The SMAJ40CAHM3_A/I is commonly deployed in body control modules, infotainment power supplies, and ADAS sensor interfaces where compliance with automotive reliability standards is mandatory.
How does the bidirectional configuration of SMAJ40CAHM3_A/I affect its circuit implementation?
The bidirectional configuration of SMAJ40CAHM3_A/I means it functions identically in both polarities - no cathode marking is present, and it clamps transients regardless of voltage polarity. This simplifies layout by eliminating orientation concerns and enables direct placement across ungrounded signal pairs or floating power rails. Unlike unidirectional variants, the SMAJ40CAHM3_A/I provides symmetrical protection without requiring external biasing or series diodes.
What is the thermal resistance profile of SMAJ40CAHM3_A/I, and how does it impact PCB layout?
SMAJ40CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W when mounted on 0.2" × 0.2" copper pads. To maintain safe junction temperatures under repetitive surge conditions, PCB layout must provide adequate copper area per terminal - minimum 5.0 mm × 5.0 mm pad dimensions are specified. Reducing RθJA through internal layer copper pours directly improves surge endurance for the SMAJ40CAHM3_A/I.
Does SMAJ40CAHM3_A/I meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes, SMAJ40CAHM3_A/I is rated MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C. This means it has unlimited floor life at standard conditions (≤30 °C / 85 % RH) and requires no pre-baking before lead-free soldering. The MSL Level 1 rating is confirmed in the Vishay datasheet and applies specifically to the HM3 variant, ensuring process compatibility for high-volume SMT assembly of the SMAJ40CAHM3_A/I.
SMAJ40CAHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- 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):
- 6.2A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ40CAHM3_A/I FAQ
1.How can I place an order for SMAJ40CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40CAHM3_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 SMAJ40CAHM3_A/I reliable?
The price and inventory of SMAJ40CAHM3_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 SMAJ40CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ40CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40CAHM3_A/I?
SMAJ40CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40CAHM3_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 SMAJ40CAHM3_A/I?
For technical support, including SMAJ40CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ40CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ40CAHM3_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 SMAJ40CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ40CAHM3_A/I?
All SMAJ40CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40CAHM3_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 SMAJ40CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ40CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ40CAHM3_A/I Tags
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