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Vishay General Semiconductor - Diodes Division SMAJ40-E3/5A
- Part No.:
- SMAJ40-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40-E3/5A.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,418
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Product details
Overview
SMAJ40-E3/5A 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 40 V standoff voltage (VWM), 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 - suitable for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMAJ40-E3/5A datasheet, SMAJ40-E3/5A pinout, SMAJ40-E3/5A application, or SMAJ40-E3/5A equivalent, key selection criteria include unidirectional polarity, 1.0 µA max reverse leakage at VWM, 150 °C junction temperature rating, RoHS-compliant matte tin plating, and J-STD-020 MSL Level 1 moisture sensitivity.
Technical Context
This TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1 ps) and low incremental surge resistance. Its breakdown voltage is specified at 44.4–54.3 V with 1 mA test current, ensuring reliable triggering above system operating voltage while maintaining low leakage during normal operation.
The device operates across -55 °C to +150 °C and is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine). Thermal resistance is 120 °C/W junction-to-ambient and 30 °C/W junction-to-lead, supporting stable performance under transient stress when mounted on 5.0 × 5.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin above 36 V nominal rail. |
| VC @ IPPM | 71.4 V - Clamped voltage at 5.6 A peak pulse; limits downstream component stress during 10/1000 µs surges. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 µs waveform; enables robust protection against IEC 61000-4-5 Level 3 surges. |
| IPPM | 5.6 A - Peak pulse current capability; derived from VC and PPPM, defines surge current threshold before voltage exceeds safe limit. |
| ID @ VWM | 1.0 µA - Reverse leakage at standoff voltage; ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial environments. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with cathode band marking; compatible with automated pick-and-place and reflow. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with two leads; cathode identified by a single band on the body; terminals are matte tin plated for solderability per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias | Connected to lower-potential side of protected line; conducts only during forward surge events (e.g., reverse polarity fault). |
| Cathode | Current exit point in forward bias; clamping terminal in reverse bias | Connected to higher-potential side (e.g., VIN rail); initiates avalanche conduction when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable breakdown characteristics and long-term reliability under repeated surge stress without parameter drift. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking; simplifies manufacturing for high-volume SMT assembly. |
| 400 W peak pulse power (≤78 V) | Provides immunity to common lightning-induced surges (IEC 61000-4-5) and inductive switching spikes in 24–48 V systems. |
| RoHS-compliant E3 suffix | Meets JESD201 Class 1A whisker resistance; eliminates tin whisker risk in commercial-grade applications over 10+ year lifetimes. |
| Low thermal resistance (RθJL = 30 °C/W) | Enables efficient heat transfer to PCB copper, sustaining repetitive surge capability without thermal runaway. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) Signal Lines |
|---|---|
Use Scenario: Protecting 48 V DC input stage of programmable logic controllers (PLCs) against load dump and ISO 7637-2 Pulse 5a transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and ground to clamp positive-going surges before they reach upstream DC-DC converters. Use Value: Limits voltage excursion to ≤71.4 V during 400 W surges, preventing damage to 75 V-rated input capacitors and controller ICs. |
Use Scenario: Safeguarding LIN bus transceiver inputs in door module ECUs exposed to battery disconnect transients and ESD events. IC Role / Device Role / Timing Role: TVS connected from LIN data line to ground to suppress fast-rising noise while preserving signal integrity below 20 kbps. Use Value: 1.0 µA leakage at 40 V ensures no measurable impact on LIN bus pull-up current budget; 71.4 V clamping protects transceiver ESD structures. |
| Telecom Remote Radio Unit (RRU) DC Feeder Protection | Consumer Appliance Motor Drive Board |
Use Scenario: Shielding 48 V PoE-powered remote radio units from induced surges on outdoor feeder cables during thunderstorms. IC Role / Device Role / Timing Role: Primary surge suppression device on DC input path, coordinated with secondary MOV-based front-end protection. Use Value: 400 W rating handles multi-event surges per IEC 61000-4-5; DO-214AC footprint allows dense layout near connector entry point. |
Use Scenario: Protecting gate drivers and microcontroller I/O pins in washing machine motor control boards from commutation spikes. IC Role / Device Role / Timing Role: TVS placed across H-bridge high-side FET source-drain to clamp inductive kickback during PWM switching. Use Value: Fast response time (<1 ps) ensures clamping occurs before FET avalanche failure; 150 °C rating accommodates sealed enclosure thermal conditions. |
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-E3/5A | Lower clamping voltage (64.5 V vs. 71.4 V) and tighter VBR range (44.4–49.1 V vs. 44.4–54.3 V); same 40 V VWM. | Better suited for 36 V systems with tight voltage margins where lower VC reduces stress on downstream 60 V-rated components. | Select SMAJ40A-E3/5A when clamping voltage headroom is critical and VBR consistency across production lots is required. |
| SMCJ40A-E3/57T | Higher power rating (1500 W), larger DO-214AB (SMC) package, same VWM/VC specs as SMAJ40A but not SMAJ40. | Used where higher surge energy absorption is needed (e.g., primary AC/DC input stages), requiring PCB layout change due to larger footprint. | Choose SMCJ40A-E3/57T only if tested surge profiles exceed 400 W; not a drop-in replacement due to package and thermal mass differences. |
Compared with SMAJ40-E3/5A, SMAJ40A-E3/5A offers tighter VBR tolerance and lower clamping for precision 36 V rail protection, while SMCJ40A-E3/57T provides threefold pulse power headroom at the cost of board space and thermal design complexity.
Availability
SMAJ40-E3/5A is available at Aetrix Electronics and suitable for industrial power supply input protection, automotive BCM signal line safeguarding, and telecom RRU DC feeder protection requiring stable component supply and full traceability.
Supply support for SMAJ40-E3/5A 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, and protection devices with emphasis on reliability, efficiency, and manufacturability.
The SMAJ series is engineered for surface-mount transient suppression in space-constrained, high-reliability applications across industrial, automotive, and telecom markets - prioritizing consistent clamping performance and JEDEC-compliant assembly compatibility.
FAQ
What is the maximum clamping voltage of the SMAJ40-E3/5A under a 10/1000 µs surge?
The SMAJ40-E3/5A has a maximum clamping voltage (VC) of 71.4 V at 5.6 A peak pulse current (IPPM) when subjected to a 10/1000 µs waveform. This value is measured per Fig. 1 and Fig. 3 in Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMAJ40-E3/5A maintains this clamping performance across its full operating temperature range.
Is the SMAJ40-E3/5A unidirectional or bidirectional, and how is polarity marked?
The SMAJ40-E3/5A is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix in its part number. Polarity is marked by a single cathode band on the DO-214AC (SMA) package body; the banded end is the cathode and must be connected toward the higher-potential side of the protected line. The SMAJ40-E3/5A does not conduct in reverse bias until voltage exceeds its breakdown threshold.
What is the reverse leakage current specification for SMAJ40-E3/5A at its standoff voltage?
The SMAJ40-E3/5A exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 40 V standoff voltage (VWM), measured at 25 °C ambient temperature. This low leakage ensures minimal power loss and signal interference in high-impedance monitoring or communication circuits. The SMAJ40-E3/5A maintains this specification across its full -55 °C to +150 °C junction temperature range.
Does SMAJ40-E3/5A meet automotive qualification standards such as AEC-Q101?
No, the SMAJ40-E3/5A is a commercial-grade device with E3 suffix (RoHS-compliant, JESD201 Class 1A whisker resistance) and does not carry AEC-Q101 qualification. For automotive applications, Vishay specifies the HE3 suffix variant (e.g., SMAJ40AHE3/5A), which undergoes additional stress testing and screening per AEC-Q101. The SMAJ40-E3/5A is intended for industrial, telecom, and consumer use cases where extended temperature operation is required but automotive qualification is not mandated.
What is the thermal resistance profile of SMAJ40-E3/5A, and how does it affect PCB layout?
The SMAJ40-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W when mounted on 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per terminal. To maintain reliability under repetitive surges, PCB layout must provide adequate copper area and thermal vias - undersized pads will elevate junction temperature beyond the 150 °C maximum, degrading clamping consistency. The SMAJ40-E3/5A's thermal performance is validated only with this minimum pad configuration.
SMAJ40-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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-E3/5A FAQ
1.How can I place an order for SMAJ40-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40-E3/5A 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 SMAJ40-E3/5A reliable?
The price and inventory of SMAJ40-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ40-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ40-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40-E3/5A?
SMAJ40-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40-E3/5A 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 SMAJ40-E3/5A?
For technical support, including SMAJ40-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40-E3/5A requirements.
6.How does Aetrix verify that SMAJ40-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ40-E3/5A 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 SMAJ40-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ40-E3/5A?
All SMAJ40-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40-E3/5A, 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 SMAJ40-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ40-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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