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Vishay General Semiconductor - Diodes Division SMA5J40A-E3/5A
- Part No.:
- SMA5J40A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J40A-E3/5A.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,224
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Product details
Overview
SMA5J40A-E3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on DC power rails and signal lines. It features a 40 V standoff voltage (VWM), 44.4–49.1 V breakdown voltage (VBR), 64.5 V clamping voltage at 7.8 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform - used to safeguard MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMA5J40A-E3/5A datasheet, SMA5J40A-E3/5A pinout, SMA5J40A-E3/5A application, or SMA5J40A-E3/5A equivalent, key selection criteria include unidirectional polarity, 150 °C max junction temperature, RoHS-compliant matte tin-plated leads, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a clamping device that remains non-conductive below VWM = 40 V and rapidly avalanches above VBR (min 44.4 V) to limit transient overvoltages. Its low incremental surge resistance and fast response time ensure effective suppression of inductive switching spikes and ESD events.
The device uses a glass-passivated silicon junction housed in an SMA (DO-214AC) surface-mount package with cathode band marking. Thermal resistance is RθJA = 80 °C/W (typical) and RθJL = 25 °C/W, enabling reliable operation up to TJ = 150 °C when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin for 36–42 V systems |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - guaranteed avalanche initiation range; ensures consistent clamping onset across production lots |
| VC @ IPPM | 64.5 V at 7.8 A - clamped voltage during 500 W transient; determines protected circuit's maximum stress level |
| PPPM | 500 W - peak pulse power handling with 10/1000 µs waveform; supports IEC 61000-4-5 Level 3/4 surge immunity |
| IFSM | 40 A - non-repetitive forward surge current (8.3 ms half-sine); enables robustness against power-rail fault currents |
| TJ max | 150 °C - maximum junction temperature; sets thermal derating envelope for sustained surge duty cycles |
| Package | SMA (DO-214AC) - industry-standard SMT outline with 5.28 mm × 4.50 mm footprint and 2.29 mm height; compatible with J-STD-020 reflow |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, unidirectional configuration with cathode band marking on one end. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge events |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line (e.g., +40 V rail); avalanches into conduction when transient exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMA package | Enables high-density PCB layouts and compatibility with automated pick-and-place equipment (MSL Level 1, 260 °C peak) |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| 500 W peak pulse power | Provides single-event surge immunity per IEC 61000-4-5 (10/1000 µs) without degradation up to rated junction temperature |
| 64.5 V clamping at 7.8 A | Limits downstream voltage stress to safe levels for 3.3 V/5 V logic interfaces and 40 V-rated power MOSFETs |
| RoHS-compliant, commercial grade | E3 suffix indicates lead-free, halogen-free compliance per JEDEC standards; suitable for consumer and industrial applications |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V/42 V battery-connected ECUs from load-dump transients and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power input and ground to shunt surges exceeding 40 V. Use Value: Clamps transients to ≤64.5 V within nanoseconds, preventing damage to MCU power domains and CAN transceivers. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC modules from ESD and cable-induced noise. IC Role / Device Role / Timing Role: Low-capacitance TVS on signal line to ground, leveraging fast response and minimal leakage (<1 µA at 40 V). Use Value: Maintains signal integrity while suppressing ±8 kV contact ESD per IEC 61000-4-2 without loading the sensor output. |
| DC-DC Converter Input Stage | Telecom Power Supply Surge Suppression |
Use Scenario: Safeguarding buck converter inputs in PoE-powered devices subjected to lightning-induced surges on Ethernet cables. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V input rail, coordinated with upstream fuse and downstream filtering. Use Value: Absorbs 500 W pulses without failure, preserving converter ICs and enabling compliance with UL 60950-1 surge requirements. |
Use Scenario: Front-end protection in telecom base station power supplies exposed to AC mains transients and induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on rectified 48 V DC bus, selected for high IPPM and thermal stability. Use Value: Withstands repeated 10/1000 µs surges at elevated ambient temperatures due to RθJA = 80 °C/W and TJ max = 150 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ40A | Same SMA package, VWM = 40 V, VC = 64.5 V @ 7.8 A, but higher typical leakage (5 µA vs. 1 µA at VWM) | Less suitable for ultra-low-power always-on sensor nodes where standby current matters | Select SMA5J40A-E3/5A when <1 µA leakage at 40 V is required for battery-backed systems |
| ON Semiconductor 1.5SMC40A | Higher package profile (DO-214AB), same electrical specs, but RθJA = 100 °C/W (vs. 80 °C/W) limits power density | Requires larger PCB area and exhibits greater thermal derating above 75 °C ambient | Prefer SMA5J40A-E3/5A for space-constrained designs needing optimal thermal performance in SMA footprint |
Compared with SMAJ40A and 1.5SMC40A, the SMA5J40A-E3/5A delivers tighter leakage control and superior thermal efficiency in the same industry-standard SMA outline - making it preferred for high-reliability, thermally dense, and low-quiescent-current applications.
Availability
SMA5J40A-E3/5A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC supply surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMA5J40A-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, TVS devices, and optoelectronics with emphasis on reliability, power density, and AEC-Q qualification.
The SMA5J series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in automotive, industrial, and telecom power systems where compact size and repeatable clamping performance are critical.
FAQ
What is the polarity configuration of the SMA5J40A-E3/5A?
The SMA5J40A-E3/5A is a unidirectional TVS diode, with the cathode identified by a band on the SMA (DO-214AC) package body. It conducts in forward direction like a standard diode and clamps reverse transients above its breakdown voltage. This polarity must be observed during PCB layout to ensure correct protection orientation on the protected line.
Does the SMA5J40A-E3/5A meet automotive qualification standards?
The SMA5J40A-E3/5A is RoHS-compliant and commercial-grade (E3 suffix). While AEC-Q101 qualified versions exist (e.g., SMA5J40AHE3_A), the SMA5J40A-E3/5A itself is not AEC-Q101 certified. For automotive applications requiring qualification, engineers should specify the HE3 suffix variant instead of E3/5A.
What is the maximum clamping voltage of the SMA5J40A-E3/5A under surge conditions?
The SMA5J40A-E3/5A has a maximum clamping voltage VC of 64.5 V at IPPM = 7.8 A, measured with a 10/1000 µs waveform. This value represents the peak voltage seen by downstream circuitry during a 500 W transient event and is critical for ensuring protected components remain within their absolute maximum ratings.
How does the SMA5J40A-E3/5A compare to bidirectional variants like SMA5J40CA?
The SMA5J40A-E3/5A is unidirectional and intended for DC line protection with defined polarity, whereas SMA5J40CA is bidirectional and suitable for AC or floating signal lines. The CA version has identical VWM, VBR, and PPPM but symmetrical clamping in both directions - making SMA5J40A-E3/5A inappropriate for AC-coupled or differential bus protection.
What is the recommended PCB pad layout for optimal thermal performance of the SMA5J40A-E3/5A?
Vishay specifies mounting the SMA5J40A-E3/5A on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated thermal resistance (RθJA = 80 °C/W). Smaller pads increase junction temperature and reduce surge capability; internal copper planes and thermal vias further improve heat dissipation in high-duty-cycle applications.
SMA5J40A-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:
- 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):
- 7.8A
- Power - Peak Pulse:
- 500W
- 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)
SMA5J40A-E3/5A FAQ
1.How can I place an order for SMA5J40A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J40A-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 SMA5J40A-E3/5A reliable?
The price and inventory of SMA5J40A-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 SMA5J40A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMA5J40A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J40A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J40A-E3/5A?
SMA5J40A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J40A-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 SMA5J40A-E3/5A?
For technical support, including SMA5J40A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J40A-E3/5A requirements.
6.How does Aetrix verify that SMA5J40A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMA5J40A-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 SMA5J40A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMA5J40A-E3/5A?
All SMA5J40A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J40A-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 SMA5J40A-E3/5A part is unused and in its original packaging.
Return procedure for SMA5J40A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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