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Vishay General Semiconductor - Diodes Division SMAJ40CA-M3/5A
- Part No.:
- SMAJ40CA-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40CA-M3/5A.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,668
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Product details
Overview
SMAJ40CA-M3/5A 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 (10/1000 μs waveform). It is widely deployed to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power supply interfaces.
For engineers reviewing the SMAJ40CA-M3/5A datasheet, SMAJ40CA-M3/5A pinout, SMAJ40CA-M3/5A application, or SMAJ40CA-M3/5A equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.38), halogen-free RoHS-compliant construction (M3 suffix), and AEC-Q101 qualification readiness via HM3 variant - critical for automotive ECU and battery management system designs.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional CA configuration, enabling protection against positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable leakage performance (<1.0 μA at VWM) and fast response time (<1 ns), while the low incremental surge resistance supports effective energy diversion during ESD or load-switching events.
The device is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its 3.3 W steady-state power dissipation and 40 A IFSM rating make it suitable for high-reliability DC power rail and interface line protection where repetitive surge immunity is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 36–42 V nominal systems. |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on above normal operating voltage with margin. |
| VC @ IPPM | 64.5 V at 6.2 A - Clamped voltage under 10/1000 μs surge; limits downstream stress to ≤64.5 V during 400 W transient events. |
| PPPM | 400 W - Peak pulse power handling (10/1000 μs); sufficient for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| IFSM | 40 A - Non-repetitive forward surge current (8.3 ms half-sine); supports robustness against inrush or fault currents in DC power paths. |
| TJ max | 150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount, low-profile package with matte tin-plated leads; compatible with automated reflow assembly per J-STD-020 MSL level 1. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with glass passivated chip junction; dimensions 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); cathode band not marked (bidirectional type).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of symmetrical PN junction; accepts reverse surge current during negative transients. |
| Cathode | Transient current entry (positive polarity) | Other terminal of symmetrical PN junction; accepts reverse surge current during positive transients; electrically identical to Anode in CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN bus, RS-485) without polarity concerns. |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients common in 12/24 V automotive power nets and industrial motor drive feedback circuits. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for global automotive and industrial OEMs; no brominated flame retardants. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during clamping, reducing risk of latch-up or damage to protected 48 V-tolerant receivers. |
| AEC-Q101 qualification path | HM3 variant available; supports qualification-ready design-in for automotive body control modules and ADAS power domains. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V power inputs of electronic control units (ECUs) against load dump and jump-start transients per ISO 7637-2. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converters and LDOs to limit input rail excursions. Use Value: Limits peak voltage to 64.5 V during 400 W surges, preventing damage to downstream 65 V-rated power management ICs. |
Use Scenario: Shielding analog and digital signal lines (e.g., 4–20 mA, thermocouple, or I²C) in factory automation sensors from ESD and inductive coupling. IC Role / Device Role / Timing Role: Bidirectional shunt protector across differential or single-ended signal pairs to clamp ±2 kV contact ESD (IEC 61000-4-2). Use Value: Sub-1 ns response ensures clamping occurs before sensitive ADC or MCU I/O structures experience overstress. |
| Telecom DC Power Feeds | Consumer Device USB/Type-C Port Protection |
|
Use Scenario: Safeguarding -48 V telecom power supplies and PoE injectors against lightning-induced surges on long-line feeds. IC Role / Device Role / Timing Role: Secondary-level TVS on DC output rails to absorb residual energy after primary GDT or MOV stages. Use Value: 400 W rating complements upstream protection, enabling staged surge handling without thermal runaway. |
Use Scenario: Providing robust ESD immunity on USB 2.0/3.0 data lines and VBUS pins in portable electronics. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF at 0 V) bidirectional clamp integrated into compact PCB layout near connector. Use Value: Maintains signal integrity up to 480 Mbps while meeting ±15 kV air/±8 kV contact IEC 61000-4-2 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 |
|---|---|---|---|
| SMAJ40CA-E3/5A | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Approved for commercial-grade industrial use; not accepted by automotive OEMs requiring halogen-free materials. | Select SMAJ40CA-M3/5A when halogen-free compliance is mandated (e.g., VW 80101, GMW3172). |
| SMBJ40CA-M3 | Same VWM/VC, but SMB (DO-214AA) package: 30 % larger footprint, 600 W PPPM, higher IPPM (10.3 A). | Better suited for higher-energy surge environments (e.g., outdoor telecom cabinets); requires PCB layout change. | Choose SMBJ40CA-M3 only if 600 W rating is required and board space allows larger package. |
Compared with SMAJ40CA-E3/5A, SMAJ40CA-M3/5A provides identical protection performance with halogen-free construction essential for automotive Tier 1 supply chains; versus SMBJ40CA-M3, it offers footprint compatibility with space-constrained layouts while delivering sufficient 400 W surge handling for most in-vehicle and industrial control applications.
Availability
SMAJ40CA-M3/5A is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power feeds, and consumer USB port protection requiring stable component supply and full traceability.
Supply support for SMAJ40CA-M3/5A 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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-speed transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, consistency, and regulatory compliance are non-negotiable.
FAQ
What is the clamping voltage of SMAJ40CA-M3/5A at its rated peak pulse current?
The SMAJ40CA-M3/5A 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 guarantees that downstream circuitry will not experience voltages exceeding 64.5 V during a 400 W transient event. The SMAJ40CA-M3/5A maintains this clamping performance across its specified operating temperature range (-55 °C to +150 °C).
Is SMAJ40CA-M3/5A suitable for automotive applications?
Yes - SMAJ40CA-M3/5A is halogen-free and RoHS-compliant, and its automotive-qualified variant (SMAJ40CA-HM3_X) meets AEC-Q101 requirements. While the base SMAJ40CA-M3/5A part itself is commercial-grade, its construction, thermal performance (TJ max = 150 °C), and surge robustness align with automotive subsystem needs such as body electronics and infotainment power rails. For certified deployment, specify the HM3 suffix with revision code (e.g., HM3_A).
How does the bidirectional design of SMAJ40CA-M3/5A affect its circuit placement?
The bidirectional nature of SMAJ40CA-M3/5A eliminates polarity constraints: it can be placed across any two nodes requiring symmetrical overvoltage protection - such as differential signal lines (CAN_H/CAN_L), AC-coupled interfaces, or floating power domains. Unlike unidirectional TVS diodes, SMAJ40CA-M3/5A has no cathode marking and functions identically regardless of orientation, simplifying layout and reducing BOM complexity in balanced protection schemes.
What is the thermal resistance of SMAJ40CA-M3/5A, and how does it impact PCB layout?
SMAJ40CA-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under sustained power dissipation, designers must provide adequate copper area and avoid excessive trace length between the device and ground/power planes. The RθJL of 30 °C/W indicates efficient heat conduction to PCB leads, supporting reliability in thermally demanding environments.
Does SMAJ40CA-M3/5A meet industry-standard ESD and surge immunity requirements?
Yes - SMAJ40CA-M3/5A delivers sub-1 ns response time and 400 W peak pulse power (10/1000 μs), enabling compliance with IEC 61000-4-5 Level 3 (1 kV line-earth, 2 kV line-line) and IEC 61000-4-2 Level 4 (±15 kV air, ±8 kV contact) when properly implemented with appropriate layout and grounding. Its low clamping voltage and stable leakage (<1.0 μA at 40 V) ensure minimal interference with normal operation while providing fail-safe transient suppression.
SMAJ40CA-M3/5A 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ40CA-M3/5A FAQ
1.How can I place an order for SMAJ40CA-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40CA-M3/5A 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 SMAJ40CA-M3/5A reliable?
The price and inventory of SMAJ40CA-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ40CA-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ40CA-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40CA-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40CA-M3/5A?
SMAJ40CA-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40CA-M3/5A 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 SMAJ40CA-M3/5A?
For technical support, including SMAJ40CA-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40CA-M3/5A requirements.
6.How does Aetrix verify that SMAJ40CA-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ40CA-M3/5A 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 SMAJ40CA-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ40CA-M3/5A?
All SMAJ40CA-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40CA-M3/5A, 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 SMAJ40CA-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ40CA-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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