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Vishay General Semiconductor - Diodes Division SMAJ40-E3/61
- Part No.:
- SMAJ40-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40-E3/61.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,666
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Product details
Overview
SMAJ40-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on power and signal lines. It features a 40 V stand-off voltage (VWM), 44.4–54.3 V breakdown voltage (VBR), 71.4 V maximum clamping voltage (VC) at 5.6 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMAJ40-E3/61 datasheet, SMAJ40-E3/61 pinout, SMAJ40-E3/61 application, or SMAJ40-E3/61 equivalent, this page delivers verified electrical parameters, JEDEC-compliant DO-214AC terminal mapping, real-world protection use cases, and two validated alternative parts with documented differences in clamping performance and reliability grade.
Technical Context
This unidirectional TVS diode operates as a fast-acting shunt clamp, activating when reverse voltage exceeds VWM = 40 V to divert surge current away from sensitive downstream circuitry. Its glass-passivated junction enables sub-nanosecond response time and low incremental surge resistance, critical for suppressing ESD and inductive switching spikes.
Rated for 150 °C maximum junction temperature and MSL Level 1 per J-STD-020, SMAJ40-E3/61 supports reflow soldering up to 260 °C. It delivers 400 W peak pulse power (derated to 300 W above 78 V) on 0.2 × 0.2″ copper pads, with 1.0 µA max reverse leakage at VWM and 5.6 A IPPM at VC = 71.4 V under standardized 10/1000 µs surge conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range. |
| VBR (min/max) | 44.4 V / 54.3 V at 1.0 mA test current - Ensures reliable turn-on margin above VWM while avoiding premature conduction. |
| VC @ IPPM | 71.4 V at 5.6 A - Clamped voltage during worst-case 10/1000 µs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W - Peak transient energy absorption capability; sufficient for IEC 61000-4-5 Level 3 surges on 24 V systems. |
| IFSM | 40 A - Single half-sine surge rating (8.3 ms); supports protection of 24–48 V DC power rails against load dump events. |
| Junction Temp Range | −55 °C to +150 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, molded plastic case with matte tin-plated leads compliant with J-STD-002 and JESD22-B102. Cathode indicated by band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential side (e.g., GND or return path) in unidirectional configuration; must be tied to system reference to enable clamping. |
| Cathode | Reverse-biased clamping node | Connected to protected line (e.g., 40 V rail or signal trace); conducts surge current to anode when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables robust protection against lightning-induced surges and inductive kickback in 24–48 V industrial control systems. |
| 71.4 V clamping voltage at 5.6 A | Limits transient overvoltage to safe levels for 3.3 V/5 V logic interfaces and gate drivers sharing same supply domain. |
| DO-214AC (SMA) package | Standardized footprint compatible with automated SMT placement and reflow; meets UL 94 V-0 flammability rating. |
| RoHS-compliant, commercial-grade E3 suffix | Meets JESD201 Class 1A whisker resistance; suitable for high-volume consumer and industrial production without special handling. |
| 1.0 µA max reverse leakage at VWM | Minimizes standby power loss in battery-backed or energy-sensitive applications such as remote sensors and IoT nodes. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers from field-wiring induced transients and relay coil flyback. IC Role / Device Role / Timing Role: Shunt-clamp TVS placed between input terminal and ground, activated within <1 ns to limit voltage to ≤71.4 V during 1 kV/500 A surge. Use Value: Prevents damage to optocoupler input stages and microcontroller GPIOs while maintaining signal integrity under repeated surge exposure. |
Use Scenario: Safeguarding LIN bus transceivers and power window motor drivers against load dump and jump-start events in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Unidirectional TVS connected across VBAT and GND, clamping 12 V rail to 71.4 V during 35 V/100 ms load dump pulses. Use Value: Extends lifetime of 40 V-rated FETs and communication ICs without requiring oversized input capacitors or additional series impedance. |
| Telecom Power Supply Input | Consumer Appliance Motor Control |
|
Use Scenario: Suppressing AC line surges and transformer ringing on primary-side 40 V auxiliary supplies in DSL modems and base stations. IC Role / Device Role / Timing Role: Fast-response TVS placed after bridge rectifier and bulk capacitor, clamping transients before they reach PWM controller ICs. Use Value: Eliminates need for redundant overvoltage crowbar circuits while meeting IEC 61000-4-5 surge immunity requirements at minimal BOM cost. |
Use Scenario: Shielding BLDC motor gate drivers and Hall-effect sensors from commutation spikes in washing machine and HVAC fan modules. IC Role / Device Role / Timing Role: Localized TVS mounted adjacent to motor driver IC, conducting surge current directly to local ground plane with <0.5 nH loop inductance. Use Value: Reduces electromagnetic emissions and prevents false triggering of fault protection logic during high-dI/dt motor phase switching. |
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 | Lower VBR range (44.4–49.1 V), tighter tolerance, 64.5 V clamping at 6.2 A - 9.7% lower VC than SMAJ40-E3/61. | Better suited for 40 V systems with tight voltage margins; preferred where clamping voltage headroom is constrained. | Select SMAJ40A-E3/61 when protecting 3.3 V or 5 V logic powered from regulated 40 V rails with minimal overvoltage allowance. |
| SMAJ40HE3/61 | AEC-Q101 qualified, high-reliability grade; identical electrical specs but enhanced process controls and extended qualification testing. | Required for automotive under-hood applications; not recommended for cost-sensitive consumer designs. | Choose SMAJ40HE3/61 only when automotive qualification and long-term field reliability are mandatory - otherwise, SMAJ40-E3/61 offers optimal cost/performance balance. |
Compared with SMAJ40-E3/61, SMAJ40A-E3/61 provides lower clamping voltage for tighter system margins, while SMAJ40HE3/61 adds automotive qualification without electrical change - enabling design reuse across commercial and automotive platforms with selective reliability upgrades.
Availability
SMAJ40-E3/61 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body electronics, telecom power supplies, and consumer appliance motor control requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMAJ40-E3/61 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, and protection devices with emphasis on reliability, thermal performance, and application-specific optimization.
The SMAJ series was engineered for high-energy transient suppression in space-constrained surface-mount applications, targeting industrial automation, automotive subsystems, and communications infrastructure where fast response and repeatable clamping are critical.
FAQ
What is the maximum clamping voltage of SMAJ40-E3/61 under standard surge conditions?
The SMAJ40-E3/61 exhibits a maximum clamping voltage (VC) of 71.4 V when subjected to its rated peak pulse current of 5.6 A using the industry-standard 10/1000 µs waveform. This value is measured at TA = 25 °C on recommended 0.2 × 0.2″ copper pads and defines the upper voltage limit imposed on protected circuitry during transient events.
Is SMAJ40-E3/61 unidirectional or bidirectional, and how is polarity identified?
SMAJ40-E3/61 is a unidirectional TVS diode. Polarity is marked by a cathode band on the device body - the banded end corresponds to the cathode terminal, which must be connected to the line being protected, while the anode connects to ground or the lower-potential reference. Bidirectional variants use the "CA" suffix (e.g., SMAJ40CA).
Does SMAJ40-E3/61 meet automotive qualification standards?
No, SMAJ40-E3/61 is a commercial-grade part with E3 suffix and RoHS compliance but lacks AEC-Q101 qualification. For automotive applications, the functionally equivalent SMAJ40HE3/61 variant is available - it shares identical electrical characteristics but undergoes extended reliability testing per AEC-Q101 for under-hood deployment.
What is the thermal resistance and maximum junction temperature rating for SMAJ40-E3/61?
SMAJ40-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and a maximum junction temperature (TJ) of +150 °C. These ratings assume mounting on minimum recommended pad layout (0.2 × 0.2″ copper per terminal) and define safe continuous operation limits in ambient temperatures up to +85 °C with appropriate derating.
How does the 400 W peak pulse power rating of SMAJ40-E3/61 scale with pulse duration and temperature?
The 400 W rating applies strictly to the 10/1000 µs waveform at TA = 25 °C. Power derating follows Fig. 2 in Vishay document 88390: at 75 °C ambient, peak pulse power drops to ~280 W; for pulses shorter than 100 µs, power capability increases - e.g., ~600 W at 10 µs - per the non-repetitive curve in Figure 1.
SMAJ40-E3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 71.4V
- Current - Peak Pulse (10/1000µs):
- 5.6A
- 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)
SMAJ40-E3/61 FAQ
1.How can I place an order for SMAJ40-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40-E3/61 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 SMAJ40-E3/61 reliable?
The price and inventory of SMAJ40-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ40-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ40-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40-E3/61?
SMAJ40-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40-E3/61 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 SMAJ40-E3/61?
For technical support, including SMAJ40-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40-E3/61 requirements.
6.How does Aetrix verify that SMAJ40-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ40-E3/61 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 SMAJ40-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ40-E3/61?
All SMAJ40-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40-E3/61, 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 SMAJ40-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ40-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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