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Vishay General Semiconductor - Diodes Division SA40-E3/54
- Part No.:
- SA40-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA40-E3/54.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,945
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Product details
Overview
SA40-E3/54 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for primary overvoltage protection of DC power rails and signal lines. It features a 40 V stand-off voltage (VWM), 64.5 V maximum clamping voltage (VC) at 7.8 A peak pulse current (IPPM), and 500 W peak pulse power rating with 10/1000 μs waveform - suitable for protecting MOSFETs, ICs, and sensor interfaces against inductive switching transients in industrial control systems.
For engineers reviewing the SA40-E3/54 datasheet, SA40-E3/54 pinout, SA40-E3/54 application, or SA40-E3/54 equivalent, this page delivers verified electrical parameters, JEDEC-compliant packaging details, AEC-Q101 qualification status, thermal derating behavior, and real-world clamping performance under standardized surge conditions.
Technical Context
The SA40-E3/54 operates as a silicon avalanche diode with glass-passivated junction, enabling fast response (<1 ns) to transient overvoltages and low incremental surge resistance. Its breakdown voltage (VBR) is specified at 44.4–49.1 V with 10 mA test current, and it maintains stable clamping up to 175 °C junction temperature.
It supports repetitive surge events at 0.01 % duty cycle and complies with JESD22-B106 soldering requirements (275 °C, 10 s). The device is RoHS-compliant (E3 suffix), matte tin-plated, and qualified to AEC-Q101 for automotive-grade reliability - though its base P/N-E3 variant is commercial grade per Vishay's ordering matrix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48 V systems. |
| VBR (min/max) | 44.4 V / 49.1 V at 10 mA - ensures predictable avalanche onset across production lot; critical for consistent protection threshold. |
| VC @ IPPM | 64.5 V at 7.8 A (10/1000 μs) - limits downstream voltage stress during worst-case surge; enables robust interface protection. |
| PPPM | 500 W - peak transient energy absorption capacity; sufficient for IEC 61000-4-5 Level 3 surges on 24–48 V lines. |
| ID @ VWM | 1.0 μA - ultra-low leakage preserves battery life and signal integrity in always-on sensor circuits. |
| TJ max. | 175 °C - supports operation in high-temperature enclosures such as motor drives and power converters. |
| Package | DO-204AC (DO-15) - industry-standard axial leaded package with UL 94 V-0 epoxy; compatible with wave and reflow soldering. |
Pinout & Package
SA40-E3/54 uses a two-terminal DO-204AC (DO-15) axial package. Polarity is marked by a cathode band on the body; the banded end is the cathode (K), and the unmarked end is the anode (A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Current entry point in forward bias; connected to protected circuit ground or low-side return path | Provides reference node for clamping action; must be routed with low-inductance path to ground plane. |
| Cathode (K) | Current exit point in forward bias; connected to protected line (e.g., +48 V rail or signal trace) | Defines clamping polarity; reverse-biased during normal operation and avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Enables stable, repeatable avalanche characteristics and long-term reliability under thermal cycling. |
| 500 W peak pulse power (10/1000 μs) | Supports repeated surge events without degradation - validated per Fig. 1 and Fig. 2 derating curves. |
| AEC-Q101 qualified variant available (HE3 suffix) | Confirms suitability for automotive electronics where qualification beyond commercial grade is required. |
| Low incremental clamping resistance | Minimizes voltage overshoot during high di/dt transients - evident from flat VC vs. IPPM curve in Fig. 7. |
| RoHS-compliant matte tin plating | Ensures solderability per J-STD-002 and JESD 22-B102; meets whisker resistance Class 1A (JESD 201). |
Applications
| Industrial Motor Drive Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Suppresses inductive kickback from relay coils and solenoid drivers in PLC I/O modules. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed across coil terminals to limit flyback voltage to <65 V. Use Value: Prevents MOSFET gate oxide damage and extends lifetime of 40 V-rated power switches in 24 V control circuits. |
Use Scenario: Protects LIN bus transceivers and microcontroller GPIOs from load dump and jump-start transients. IC Role / Device Role / Timing Role: Standoff protector on 12 V supply rail upstream of LDO regulators. Use Value: Clamps 12 V rail to ≤64.5 V during ISO 7637-2 Pulse 5a events, preserving regulator input rating and system uptime. |
| Telecom Power Supply Input | Consumer Appliance Sensor Interface |
Use Scenario: Shields AC/DC adapter secondary-side outputs against lightning-induced surges on PoE-powered equipment. IC Role / Device Role / Timing Role: Secondary-side TVS on +48 V output rail before DC-DC converter input. Use Value: Limits transient energy to <500 W while maintaining 40 V nominal operation - compliant with IEC 61000-4-5 Ed. 3. |
Use Scenario: Guards analog outputs of temperature/humidity sensors in smart home hubs exposed to ESD and cable coupling. IC Role / Device Role / Timing Role: Low-leakage (1.0 μA) protector on 3.3 V or 5 V analog signal lines. Use Value: Preserves measurement accuracy with negligible offset error while surviving 8 kV contact ESD per IEC 61000-4-2. |
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-E3/52 (Vishay) | Same VWM (40 V), same DO-214AC (SMA) package; lower PPPM (400 W), higher VF (1.2 V @ 10 A) | Surface-mount alternative for space-constrained PCBs; less robust for high-energy surges | Select SMAJ40A-E3/52 only when board area is constrained and surge energy remains ≤400 W. |
| P4KE40A (Littelfuse) | Same VWM (40 V), DO-41 package; identical 500 W rating but higher VC (69.4 V @ 7.2 A); no AEC-Q101 option | Legacy through-hole alternative with wider availability; slightly higher clamping increases downstream stress | Choose P4KE40A if legacy DO-41 footprint compatibility is required and 4.9 V higher VC is acceptable. |
Compared with SMAJ40A-E3/52 and P4KE40A, SA40-E3/54 offers optimal balance of clamping tightness (64.5 V), proven reliability in DO-15 axial form factor, and direct path to AEC-Q101 qualification via HE3 variant - making it preferred for new industrial and automotive designs requiring field-proven surge resilience.
Availability
SA40-E3/54 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power supplies, and consumer appliance sensor interfaces requiring stable component supply and long-term obsolescence management.
Supply support for SA40-E3/54 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, efficiency, and application-specific optimization.
The SAxxA series was developed for cost-effective, high-energy transient suppression in DC power and signal lines - targeting industrial automation, automotive subsystems, and infrastructure equipment where robustness and JEDEC-standard packaging are essential.
FAQ
What is the clamping voltage of SA40-E3/54 under standard surge conditions?
The SA40-E3/54 exhibits a maximum clamping voltage (VC) of 64.5 V when subjected to a 10/1000 μs waveform at 7.8 A peak pulse current (IPPM), as specified in the Vishay datasheet (Document Number: 88378, page 2). This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during transient events. The SA40-E3/54 maintains this clamping performance across its rated junction temperature range (–55 °C to +175 °C), with minor derating above 25 °C per Fig. 2.
Is SA40-E3/54 suitable for automotive applications?
The SA40-E3/54 itself is the commercial-grade variant (E3 suffix), not AEC-Q101 qualified. However, Vishay offers the SA40HE3/54 - identical electrical specs with AEC-Q101 qualification - for automotive use. Engineers selecting SA40-E3/54 for automotive prototypes must verify whether qualification is mandatory for their Tier 1 or OEM requirement; for production, SA40HE3/54 is the designated automotive-grade version of the SA40-E3/54 platform.
What is the leakage current of SA40-E3/54 at its rated stand-off voltage?
The SA40-E3/54 has a maximum reverse leakage current (ID) of 1.0 μA at its rated stand-off voltage (VWM) of 40 V and ambient temperature of 25 °C, as confirmed in the Electrical Characteristics table (page 2 of datasheet 88378). This ultra-low leakage ensures minimal power loss in battery-backed or always-on circuits and avoids false triggering in high-impedance sensor interfaces - a key design advantage over higher-leakage alternatives like older P4KE series.
Does SA40-E3/54 have a bi-directional counterpart?
No - SA40-E3/54 is strictly a uni-directional TVS diode. Its bi-directional counterpart in the same SAxx family is SA40CA-E3/54, which carries the "CA" suffix and provides symmetrical clamping for AC-coupled or floating signal lines. The SA40CA-E3/54 shares identical VWM (40 V), PPPM (500 W), and DO-204AC packaging but differs in polarity marking (no band) and bidirectional breakdown behavior - confirming that SA40-E3/54 must not be substituted for AC protection without circuit redesign.
What is the maximum surge current rating for SA40-E3/54?
The SA40-E3/54 is rated for a peak pulse current (IPPM) of 7.8 A under the standard 10/1000 μs double-exponential waveform, derived from its 500 W peak pulse power rating and 64.5 V clamping voltage (IPPM = PPPM / VC). This value is explicitly listed in the Electrical Characteristics table for SA40A (page 2, datasheet 88378). For non-repetitive 8.3 ms half-sine surges, the device supports up to 70 A peak forward surge current (IFSM), applicable only in uni-directional configuration.
SA40-E3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- 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):
- 7A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA40-E3/54 FAQ
1.How can I place an order for SA40-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA40-E3/54 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 SA40-E3/54 reliable?
The price and inventory of SA40-E3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA40-E3/54 is usually 5 days.
3.What payment methods are accepted for SA40-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA40-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA40-E3/54?
SA40-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA40-E3/54 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 SA40-E3/54?
For technical support, including SA40-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA40-E3/54 requirements.
6.How does Aetrix verify that SA40-E3/54 is sourced from the original manufacturer or authorized distributors?
All SA40-E3/54 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 SA40-E3/54 meets industry standards.
7.What is the process for return or replacement of SA40-E3/54?
All SA40-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA40-E3/54, 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 SA40-E3/54 part is unused and in its original packaging.
Return procedure for SA40-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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