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Vishay General Semiconductor - Diodes Division SMA5J40CA-E3/5A
- Part No.:
- SMA5J40CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J40CA-E3/5A.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,755
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Product details
Overview
SMA5J40CA-E3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on power and signal lines. It features a 40 V stand-off voltage (VWM), 49.1 V maximum breakdown voltage (VBR), 64.5 V clamping voltage (VC) at 7.8 A peak pulse current (IPPM), and 500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMA5J40CA-E3/5A datasheet, SMA5J40CA-E3/5A pinout, SMA5J40CA-E3/5A application, or SMA5J40CA-E3/5A equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification eligibility (via HE3/HM3 variants), RoHS-compliant matte tin terminations, and thermal resistance (RθJA = 80 °C/W) under standard PCB pad layout.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with clamping action triggered when reverse or forward voltage exceeds VBR (44.4–49.1 V). Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ps), critical for protecting MOSFET gates and microcontroller I/O against ESD and inductive switching transients.
The device sustains non-repetitive 10/1000 μs surges up to 7.8 A while limiting voltage to ≤64.5 V, and handles 40 A unidirectional forward surge (IFSM) - though SMA5J40CA is bidirectional and thus excludes IFSM rating. Junction temperature range spans −55 °C to +150 °C, with MSL Level 1 moisture sensitivity and 260 °C reflow compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 36–40 V nominal systems. |
| VBR (min/max) | 44.4 V / 49.1 V - Breakdown occurs within this band at 1 mA test current; ensures reliable turn-on without premature conduction. |
| VC @ IPPM | 64.5 V at 7.8 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on protected downstream circuitry. |
| PPPM | 500 W - Peak pulse power handling per 10/1000 μs waveform; enables robust protection against IEC 61000-4-5 Level 3/4 surges. |
| ID @ VWM | ≤1.0 μA - Reverse leakage at stand-off voltage; negligible power loss and no measurable loading on 40 V bias rails. |
| RθJA | 80 °C/W - Thermal resistance junction-to-ambient on 5.0 mm × 5.0 mm copper pads; informs derating above 25 °C ambient. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (unmarked) | Bidirectional terminal pair | No polarity marking; symmetrical conduction in either direction - eliminates orientation errors during automated placement. |
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 external polarity management. |
| 500 W peak pulse power | Withstands 10/1000 μs surges up to 7.8 A - sufficient for IEC 61000-4-5 4 kV/2 Ω combination wave testing on 40 V rails. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., relay coil flyback), improving protection margin for sensitive IC inputs. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without pre-baking; compatible with high-volume automated manufacturing. |
| AEC-Q101 qualification path | HE3/HM3 variants available - enables drop-in use in automotive ECUs, body control modules, and ADAS sensor interfaces requiring automotive-grade reliability. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of engine coolant temperature sensors exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across sensor supply and ground to shunt transients before reaching ADC input or regulator. Use Value: Limits voltage excursion to ≤64.5 V during 40 V system load dump events, preventing latch-up or permanent damage to 5 V or 3.3 V signal conditioning circuitry. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers against field-wiring induced surges and contact bounce. IC Role / Device Role / Timing Role: Primary surge suppression element at connector entry point, upstream of optocoupler or Schmitt trigger input stage. Use Value: Clamps 1 kV/0.5 Ω IEC 61000-4-5 surges to <65 V within nanoseconds, preserving input logic state integrity and extending optocoupler lifetime. |
| Telecom Line Interface | Consumer Power Adapter Output |
Use Scenario: Transient suppression on POTS line interface circuits in VoIP gateways subjected to lightning-induced longitudinal surges. IC Role / Device Role / Timing Role: Common-mode TVS across tip/ring pair referenced to chassis ground, operating in bidirectional mode during differential and common-mode events. Use Value: Symmetric clamping ensures equal protection regardless of surge polarity - critical for legacy telephone line compliance with GR-1089-CORE. |
Use Scenario: Secondary-side overvoltage protection on 40 V DC output of laptop power adapters during no-load regulation faults or feedback loop failure. IC Role / Device Role / Timing Role: Last-line defense parallel to output capacitor, clamping fault voltage before it reaches USB-PD controller or battery management IC. Use Value: 40 V VWM aligns precisely with adapter nominal output; 64.5 V VC prevents exceedance of 65 V absolute maximum ratings in downstream silicon. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J40A-E3/5A | Unidirectional variant; cathode marked; 40 A IFSM rating; same VWM/VBR/VC/PPPM. | Requires polarity-aware layout; suitable only where DC bias polarity is fixed and forward conduction must be supported. | Select SMA5J40A-E3/5A only if protecting unidirectional DC rails with known polarity and need for surge current handling in forward direction. |
| SMB5J40CA-E3/5A | Same electrical specs but SMB (DO-214AA) package - 2.54 mm lead pitch vs. SMA's 2.29 mm; 600 W PPPM rating. | Larger footprint; higher power handling; less dense placement; better thermal dissipation on minimal copper. | Choose SMB5J40CA-E3/5A when board space allows and higher surge margin (600 W) or improved thermal performance is required. |
Compared with SMA5J40CA-E3/5A, the unidirectional SMA5J40A-E3/5A adds forward surge capability but requires strict polarity control, while the SMB5J40CA-E3/5A trades compactness for 20 % higher pulse power and relaxed thermal constraints - making SMA5J40CA-E3/5A optimal for space-constrained bidirectional protection at 40 V nominal systems.
Availability
SMA5J40CA-E3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply, RoHS compliance, and consistent tape-and-reel delivery for SMT production.
Supply support for SMA5J40CA-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, MOSFETs, and protection devices with emphasis on reliability, power density, and automotive qualification.
The SMA5J series targets high-power-density transient suppression in space-constrained applications - engineered for robustness in harsh environments including automotive under-hood, factory automation, and outdoor telecom infrastructure.
FAQ
What is the polarity configuration of SMA5J40CA-E3/5A?
SMA5J40CA-E3/5A is a bidirectional TVS diode with no polarity marking on the SMA (DO-214AC) package. It provides symmetrical clamping in both forward and reverse directions, making it suitable for AC-coupled or floating signal paths where voltage transients may occur with either polarity - unlike unidirectional variants such as SMA5J40A-E3/5A which feature a cathode band.
Does SMA5J40CA-E3/5A meet automotive qualification standards?
SMA5J40CA-E3/5A itself is commercial-grade (E3 suffix), but Vishay offers AEC-Q101 qualified versions under ordering codes SMA5J40CAHE3_X and SMA5J40CAHM3_X. These variants undergo stress testing per AEC-Q101 and are intended for automotive applications such as body electronics and ADAS sensor interfaces - SMA5J40CA-E3/5A serves as the baseline commercial part in the same platform.
What is the maximum clamping voltage for SMA5J40CA-E3/5A and under what test condition?
The maximum clamping voltage for SMA5J40CA-E3/5A is 64.5 V, measured at a peak pulse current (IPPM) of 7.8 A using the standardized 10/1000 μs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and is guaranteed across the full operating temperature range.
Can SMA5J40CA-E3/5A be used in place of SMA5J40A-E3/5A?
SMA5J40CA-E3/5A can replace SMA5J40A-E3/5A only in bidirectional or AC-coupled applications - it lacks unidirectional forward surge capability (IFSM = 40 A) and does not support sustained forward conduction. In DC-biased circuits requiring forward surge handling or polarity-specific protection, SMA5J40A-E3/5A remains necessary; layout changes may be needed due to absence of cathode marking on SMA5J40CA-E3/5A.
What PCB pad layout is recommended for optimal thermal performance of SMA5J40CA-E3/5A?
Vishay specifies mounting SMA5J40CA-E3/5A on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve the rated RθJA of 80 °C/W. Reducing pad area increases thermal resistance and reduces surge current derating - especially critical in high-temperature environments. The SMA5J40CA-E3/5A datasheet provides exact dimensions in Document Number 88875, Figure "Mounting Pad Layout".
SMA5J40CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMA5J40CA-E3/5A FAQ
1.How can I place an order for SMA5J40CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J40CA-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 SMA5J40CA-E3/5A reliable?
The price and inventory of SMA5J40CA-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 SMA5J40CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMA5J40CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J40CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J40CA-E3/5A?
SMA5J40CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J40CA-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 SMA5J40CA-E3/5A?
For technical support, including SMA5J40CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J40CA-E3/5A requirements.
6.How does Aetrix verify that SMA5J40CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMA5J40CA-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 SMA5J40CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMA5J40CA-E3/5A?
All SMA5J40CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J40CA-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 SMA5J40CA-E3/5A part is unused and in its original packaging.
Return procedure for SMA5J40CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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