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Vishay General Semiconductor - Diodes Division SMAJ40A-M3/61
- Part No.:
- SMAJ40A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40A-M3/61.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,776
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Product details
Overview
SMAJ40A-M3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection on DC power rails and signal lines. 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 in automotive body control modules to protect 3.3 V/5 V/12 V microcontroller I/O and CAN transceiver interfaces against ESD and load dump transients.
For engineers reviewing the SMAJ40A-M3/61 datasheet, SMAJ40A-M3/61 pinout, SMAJ40A-M3/61 application, or SMAJ40A-M3/61 equivalent, this device is selected for its halogen-free RoHS-compliant construction (M3 suffix), AEC-Q101 qualification readiness, low incremental surge resistance, and compatibility with automated SMT placement on standard SMA (DO-214AC) footprints.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: under normal conditions it presents <1 μA reverse leakage at 40 V; during transient events exceeding VBR, it avalanches rapidly (<1 ns response) to clamp the line at ≤64.5 V while diverting up to 6.2 A of surge current. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surges.
The device is thermally rated for TJ = –55 °C to +150 °C, with RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 30 °C/W, enabling operation in high-temperature automotive engine bay and industrial control environments without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 40 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin for 36–42 V systems. |
| VBR (Breakdown Voltage) | 44.4–49.1 V at 1 mA - Confirmed avalanche initiation range; ensures reliable triggering above system nominal voltage. |
| VC (Clamping Voltage) | 64.5 V at IPPM = 6.2 A - Measured peak voltage during 10/1000 μs surge; determines protected IC's absolute maximum stress level. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy-handling capability per single 10/1000 μs transient; sufficient for ISO 7637-2 Pulse 1/2/5a in 12 V automotive. |
| IFSM (Surge Current) | 40 A - Peak forward surge rating (8.3 ms half-sine); supports protection against sustained inductive kickback in relay/motor drive circuits. |
| TJ Range | –55 °C to +150 °C - Full automotive-grade junction temperature range; validated for under-hood and battery management use. |
| Package | SMA (DO-214AC) - Standardized 2-pin surface-mount outline with cathode band marking; compatible with IPC-7351B footprint. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 (260 °C reflow peak), UL 94 V-0 rated compound. Cathode indicated by a band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry terminal during clamping | Connected to protected line (e.g., VCC or signal); conducts surge current toward ground when VAK > VBR. |
| Cathode (banded end) | Current exit terminal during clamping | Connected to system ground or low-impedance return path; establishes polarity-sensitive clamping direction for unidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables compliance with ISO 7637-2 Pulse 5a (load dump) in 12 V automotive systems without derating. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets EU Directive 2015/863 and automotive OEM material declarations; eliminates brominated flame retardants. |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes overvoltage stress on downstream ICs-critical for protecting 5 V logic and 3.3 V MCU I/O pins. |
| Fast response time (< 1 ns) | Clamps transients before propagation into sensitive analog or digital circuitry; prevents latch-up or gate oxide damage. |
| AEC-Q101 qualification option (HM3 suffix) | Supports drop-in upgrade path to automotive-qualified version without PCB or layout change. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 12 V supply rail and LIN bus lines in BCM against alternator load dump and ESD. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between VBAT and chassis ground, triggered within nanoseconds upon overvoltage. Use Value: Limits transient voltage to ≤64.5 V, preventing damage to 3.3 V microcontrollers and LIN transceivers rated for 40 V absolute max. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Primary front-end protection element on each optocoupler input channel, clamping fast-rising transients before isolation barrier. Use Value: Withstands 400 W pulses without degradation, ensuring >100,000 surge cycles in factory automation environments. |
| Consumer Appliance Motor Drive Board | Telecom Power Supply Front-End |
Use Scenario: Shielding MCU GPIOs and H-bridge gate drivers from back-EMF spikes generated by brushed DC motors. IC Role / Device Role / Timing Role: Localized TVS mounted adjacent to motor driver IC, providing sub-ns response to inductive switching noise. Use Value: Clamps 6.2 A surges at 64.5 V, maintaining gate drive integrity and preventing false triggering or MOSFET failure. |
Use Scenario: Secondary-side overvoltage suppression on +48 V telecom rectifier outputs feeding PoE PSE controllers. IC Role / Device Role / Timing Role: Standoff-rated protector on DC output rail, activated only during fault conditions such as rectifier short or capacitor failure. Use Value: 40 V VWM allows stable operation across full 48 V ±10% tolerance range while clamping faults below 65 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-E3/61 | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Approved for commercial/industrial use; not accepted by automotive OEMs requiring halogen-free materials. | Select SMAJ40A-E3/61 only if halogen content is unrestricted and cost sensitivity outweighs material compliance requirements. |
| SMAJ43A-M3/61 | Higher VWM (43 V), VBR (47.8–52.8 V), and VC (69.4 V); same package and power rating. | Better suited for 42 V battery systems or higher-margin 36 V rails where tighter clamping is less critical than increased standoff headroom. | Choose SMAJ40A-M3/61 when protecting 12 V or 24 V systems with strict clamping limits; select SMAJ43A-M3/61 for 36–42 V applications needing wider VWM margin. |
Compared with SMAJ40A-E3/61, SMAJ40A-M3/61 adds halogen-free compliance without performance trade-offs; versus SMAJ43A-M3/61, it provides lower clamping voltage at the expense of reduced standoff margin-making it optimal for 12 V/24 V systems where voltage headroom is constrained.
Availability
SMAJ40A-M3/61 is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and consumer appliance designs requiring stable component supply, halogen-free compliance, and AEC-Q101 upgrade path support.
Supply support for SMAJ40A-M3/61 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, TVS devices, and power MOSFETs with emphasis on reliability, thermal performance, and automotive qualification.
The SMAJ series was engineered specifically for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where robustness, fast response, and long-term stability are mandatory.
FAQ
What is the maximum clamping voltage of the SMAJ40A-M3/61 under a 10/1000 μs surge?
The SMAJ40A-M3/61 has a maximum clamping voltage (VC) of 64.5 V at 6.2 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per JEDEC standards and confirmed in Vishay's datasheet revision 09-Jan-2024 (Document Number: 88390). The clamping voltage directly defines the upper voltage limit imposed on protected circuitry during surge events, making it a critical parameter for ensuring downstream IC survival. SMAJ40A-M3/61 maintains this performance across its full operating temperature range.
Is the SMAJ40A-M3/61 suitable for automotive applications?
Yes-the SMAJ40A-M3/61 is halogen-free and RoHS-compliant (M3 suffix), and its base family is AEC-Q101 qualified when ordered with HM3 suffix (e.g., SMAJ40AHM3_A/H). While the M3 variant itself is not pre-qualified, it shares identical die, construction, and test flow with the HM3 version, enabling straightforward qualification migration. Its 150 °C junction rating, 400 W pulse power, and robust surge current handling make SMAJ40A-M3/61 appropriate for non-safety-critical automotive subsystems including body electronics, infotainment power rails, and sensor interfaces.
How does the SMAJ40A-M3/61 differ from the SMAJ40A-E3/61?
The SMAJ40A-M3/61 and SMAJ40A-E3/61 share identical electrical specifications-including VWM = 40 V, VBR = 44.4–49.1 V, VC = 64.5 V, and PPPM = 400 W-but differ in material composition. The M3 suffix denotes halogen-free molding compound compliant with IEC 61249-2-21, whereas E3 uses brominated flame retardants. Both meet RoHS, but only M3 satisfies automotive OEM requirements for halogen-free content. Physical dimensions, thermal resistance, and solderability are identical between the two variants.
What is the thermal resistance of the SMAJ40A-M3/61, and how does it affect PCB layout?
The SMAJ40A-M3/61 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, and junction-to-lead resistance (RθJL) of 30 °C/W. These values require adherence to Vishay's recommended pad layout (Document 88390, page 5) to ensure reliable operation at full power. Reducing pad area increases RθJA, potentially causing thermal runaway during repetitive surges; therefore, SMAJ40A-M3/61 must be placed on minimum specified copper to sustain 400 W pulses without exceeding 150 °C junction temperature.
Can the SMAJ40A-M3/61 be used in bidirectional configurations?
No-the SMAJ40A-M3/61 is a unidirectional TVS diode, identifiable by its cathode band marking and part number suffix "A" (not "CA"). Bidirectional operation requires the CA variant (e.g., SMAJ40CA-M3/61), which lacks polarity marking and exhibits symmetrical breakdown in both directions. Using SMAJ40A-M3/61 in a bidirectional circuit would result in forward conduction during negative transients, potentially damaging the device or failing to clamp. Always verify polarity alignment during layout: cathode to ground, anode to protected line.
SMAJ40A-M3/61 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ40A-M3/61 FAQ
1.How can I place an order for SMAJ40A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40A-M3/61 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 SMAJ40A-M3/61 reliable?
The price and inventory of SMAJ40A-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ40A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ40A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40A-M3/61?
SMAJ40A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40A-M3/61 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 SMAJ40A-M3/61?
For technical support, including SMAJ40A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40A-M3/61 requirements.
6.How does Aetrix verify that SMAJ40A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ40A-M3/61 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 SMAJ40A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ40A-M3/61?
All SMAJ40A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40A-M3/61, 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 SMAJ40A-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ40A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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