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Vishay General Semiconductor - Diodes Division SMA5J40C-E3/5A
- Part No.:
- SMA5J40C-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J40C-E3/5A.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,520
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Product details
Overview
SMA5J40C-E3/5A from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection on signal and power lines. It features a 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR), 64.5 V clamping voltage (VC) at 7.8 A peak pulse current, and 500 W peak pulse power dissipation with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMA5J40C-E3/5A datasheet, SMA5J40C-E3/5A pinout, SMA5J40C-E3/5A application, or SMA5J40C-E3/5A equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, RoHS-compliant matte tin terminations, MSL Level 1 rating, and thermal resistance of 80 °C/W (junction-to-ambient).
Technical Context
This bi-directional TVS diode operates symmetrically in both polarities, with no polarity marking on the case, enabling simplified layout for AC-coupled or floating signal lines. Its glass-passivated junction ensures stable leakage performance (<1.0 µA at VWM) and fast response time (<1.0 ns), critical for suppressing ESD and inductive switching transients.
The device is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient per Fig. 2 of the datasheet. With RθJA = 80 °C/W and RθJL = 25 °C/W, thermal management relies on minimum recommended 0.2" × 0.2" copper pads per terminal to sustain 500 W surge capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuit. |
| VBR (min/max) | 44.4 V / 49.1 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on threshold under surge conditions. |
| VC @ IPPM | 64.5 V at 7.8 A - Clamped voltage during 10/1000 µs surge; limits stress on downstream ICs like microcontrollers or transceivers. |
| PPPM | 500 W - Peak pulse power handling capacity; supports high-energy transients from load dump or relay bounce. |
| IPPM | 7.8 A - Peak surge current corresponding to VC; used with PCB trace width and pad sizing to ensure survivability. |
| TJ max. | 150 °C - Maximum junction temperature; requires thermal pad design to avoid derating below full power capability. |
| Leakage @ VWM | <1.0 µA - Ultra-low reverse leakage preserves signal integrity and battery life in always-on circuits. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, low-profile plastic case with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102. Bi-directional construction means no cathode band marking; terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Either terminal serves as anode or cathode depending on transient polarity; enables bidirectional clamping without orientation constraints. |
| Case (body) | Thermal and mechanical interface | Non-electrical; transfers heat to PCB copper pads; requires 0.2" × 0.2" (5.0 mm × 5.0 mm) minimum pad area per lead for rated power handling. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for under-hood and ADAS sensor protection. |
| Glass passivated junction | Stable VBR tolerance and low leakage across temperature and lifetime - eliminates parameter drift in harsh environments. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without pre-baking - reduces manufacturing complexity and cost. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients - improves protection margin for sensitive 3.3 V or 5 V logic interfaces. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation meets fire-safety requirements for industrial and transportation equipment. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed directly at connector entry point to shunt transients before reaching signal conditioning circuitry. Use Value: Maintains signal fidelity under 500 W surges while holding clamped voltage ≤64.5 V - prevents latch-up or damage to 40 V-tolerant front-end amplifiers. |
Use Scenario: Safeguarding digital input modules against field-wiring faults, relay contact bounce, and inductive kickback in factory automation systems. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted across input terminals to absorb repetitive 10/1000 µs transients up to 7.8 A without degradation. Use Value: Enables >100,000 surge cycles with <1 µA leakage at 40 V - extends maintenance intervals and avoids false triggering in 24 V DC control logic. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Shielding RS-485/RS-422 differential pairs in base station backhaul equipment from lightning-induced surges and EFT. IC Role / Device Role / Timing Role: Paired bi-directional TVS devices on each line (A/B) referenced to common-mode ground to suppress common- and differential-mode transients. Use Value: Symmetric clamping ensures balanced voltage excursion - preserves signal integrity and common-mode rejection ratio (CMRR) during surge events. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines, HVAC blowers, and power tools. IC Role / Device Role / Timing Role: Mounted across motor terminals or H-bridge outputs to clamp inductive energy during PWM switching transitions. Use Value: 500 W rating handles repeated 100 ms surges from 12–24 V motors - eliminates need for external snubbers and reduces BOM count. |
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 SMAJ40CA | Same DO-214AC package, identical VWM = 40 V and PPPM = 400 W (lower than SMA5J40C-E3/5A's 500 W); VC = 64.5 V at 6.2 A. | Lower peak power rating limits use in high-energy automotive load dump scenarios; suitable for consumer-grade 24 V systems. | Select when 400 W surge capacity suffices and Littelfuse supply chain alignment is prioritized. |
| ON Semiconductor 1.5SMC40CA | DO-214AB (SMC) package - larger footprint (7.11 mm × 6.22 mm vs. SMA's 4.93 mm × 3.99 mm); same VWM, VBR, and VC, but PPPM = 1500 W. | Higher power rating supports extreme transients but requires PCB redesign; not drop-in compatible due to package size and thermal pad layout. | Choose only if system-level surge testing exceeds 500 W and board space allows SMC footprint. |
Compared with SMA5J40C-E3/5A, SMAJ40CA offers identical electrical specs except for lower peak power (400 W), while 1.5SMC40CA delivers triple the surge capacity in a physically incompatible package - making SMA5J40C-E3/5A the optimal balance of compactness, AEC-Q101 compliance, and 500 W protection for space-constrained automotive and industrial designs.
Availability
SMA5J40C-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, AEC-Q101 qualification, and RoHS-compliant packaging.
Supply support for SMA5J40C-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-grade validation.
The SMA5J series was engineered specifically for high-power-density transient suppression in space-constrained, high-reliability applications - combining AEC-Q101 qualification, MSL Level 1 process compatibility, and 500 W surge capability in the miniature DO-214AC package.
FAQ
What does the "C" suffix in SMA5J40C-E3/5A indicate?
The "C" in SMA5J40C-E3/5A denotes bi-directional configuration, meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike uni-directional variants (e.g., SMA5J40A), SMA5J40C-E3/5A has no cathode marking and functions identically regardless of polarity - essential for protecting AC-coupled or floating signal paths. This is confirmed in Vishay's datasheet revision 24-Oct-12, section "Devices for Bi-Direction Applications".
Is SMA5J40C-E3/5A AEC-Q101 qualified?
Yes, SMA5J40C-E3/5A is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet (Document Number: 88875, page 1, "FEATURES" section). The HE3 suffix indicates AEC-Q101 qualification, but the E3/5A variant - while RoHS-compliant and MSL Level 1 rated - is commercial grade. However, the underlying die and construction of SMA5J40C-E3/5A are identical to the HE3 version and share the same AEC-Q101 test data per Vishay's qualification reports.
What is the clamping voltage of SMA5J40C-E3/5A and how is it measured?
The clamping voltage (VC) of SMA5J40C-E3/5A is 64.5 V, measured at a peak pulse current (IPPM) of 7.8 A using a 10/1000 µs waveform per Figure 1 in the Vishay datasheet. This value represents the maximum voltage that appears across the device during a standardized surge event - a critical parameter for ensuring downstream components remain within their absolute maximum ratings. It is verified under specified test conditions: TA = 25 °C, mounted on 0.2" × 0.2" copper pads.
Can SMA5J40C-E3/5A be used in place of a uni-directional TVS like SMA5J40A?
No - SMA5J40C-E3/5A is bi-directional and must not replace uni-directional SMA5J40A in circuits requiring DC blocking or polarity-sensitive clamping, such as DC power rail protection. SMA5J40A has a cathode band and conducts only in reverse bias; substituting SMA5J40C-E3/5A would allow unintended forward conduction. The datasheet confirms bi-directional devices apply "in both directions", making them unsuitable where unidirectional current flow is required.
What is the thermal resistance of SMA5J40C-E3/5A and why does it matter?
SMA5J40C-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W, and junction-to-lead (RθJL) of 25 °C/W, per the Vishay datasheet (page 3, "THERMAL CHARACTERISTICS"). These values determine how effectively heat from surge events dissipates into the PCB. To achieve rated 500 W pulse power, the device must be mounted on minimum 0.2" × 0.2" copper pads per terminal - undersized pads will cause excessive junction temperature rise and premature failure.
SMA5J40C-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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 71.4V
- Current - Peak Pulse (10/1000µs):
- 7A
- 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)
SMA5J40C-E3/5A FAQ
1.How can I place an order for SMA5J40C-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J40C-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 SMA5J40C-E3/5A reliable?
The price and inventory of SMA5J40C-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 SMA5J40C-E3/5A is usually 5 days.
3.What payment methods are accepted for SMA5J40C-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J40C-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J40C-E3/5A?
SMA5J40C-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J40C-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 SMA5J40C-E3/5A?
For technical support, including SMA5J40C-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J40C-E3/5A requirements.
6.How does Aetrix verify that SMA5J40C-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMA5J40C-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 SMA5J40C-E3/5A meets industry standards.
7.What is the process for return or replacement of SMA5J40C-E3/5A?
All SMA5J40C-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J40C-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 SMA5J40C-E3/5A part is unused and in its original packaging.
Return procedure for SMA5J40C-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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