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Vishay General Semiconductor - Diodes Division SA40A-E3/54
- Part No.:
- SA40A-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA40A-E3/54.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
SA40A-E3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode in DO-15 package, designed for circuit protection against ESD and surge transients. It features 40 V stand-off 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.
For engineers reviewing the SA40A-E3/54 datasheet, SA40A-E3/54 pinout, SA40A-E3/54 application, or SA40A-E3/54 equivalent, key selection criteria include clamping performance under 7.8 A surge, thermal derating above 25 °C, unidirectional polarity marking, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
The SA40A-E3/54 operates as a silicon avalanche diode with glass-passivated junction, responding to transient overvoltage events within picoseconds. Its unidirectional configuration uses a cathode band for polarity identification and exhibits 3.5 V maximum forward voltage at 100 A, enabling robust surge handling without latch-up.
Thermal management is defined by 175 °C maximum junction temperature and 3.0 W steady-state power dissipation on infinite heatsink at 75 °C lead temperature. The device complies with JESD 22-B106 soldering (275 °C, 10 s) and JESD 201 Class 1A whisker testing via E3 suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 44.4 V / 49.1 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 64.5 V - Clamped voltage across device at 7.8 A peak pulse current, limiting downstream stress |
| PPPM | 500 W - Peak transient energy absorption capability with 10/1000 μs waveform |
| IFSM | 70 A - Non-repetitive forward surge current rating (10 ms half-sine), critical for inductive switch-off events |
| TJ max | 175 °C - Maximum junction temperature, supporting operation in under-hood automotive environments |
| ID @ VWM | 1.0 μA - Reverse leakage at rated stand-off voltage, ensuring minimal standby power loss |
Pinout & Package
Package: DO-15 (DO-204AC), axial-leaded, molded epoxy case with matte tin-plated leads. Cathode identified by color band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to protected line ground or low-side reference; carries full surge current during clamping |
| Cathode | Reverse-biased terminal / Clamping node | Marked with band; tied to supply rail or signal line to be protected; conducts avalanche current when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche behavior and long-term reliability under repetitive surge stress |
| 500 W peak pulse power (10/1000 μs) | Provides sufficient energy absorption for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity compliance |
| AEC-Q101 qualified (E3 suffix) | Validated for automotive applications including engine control units and body electronics |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), improving protection margin |
| UL 94 V-0 molding compound | Ensures flame-retardant housing suitable for enclosed industrial and automotive enclosures |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges exceeding 40 V. Use Value: Limits voltage to ≤64.5 V during 7.8 A transients, preventing damage to downstream regulators and microcontrollers. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to PLC inputs. IC Role / Device Role / Timing Role: TVS mounted at connector interface to shunt induced lightning or EFT noise on signal lines. Use Value: Sub-100 ns response ensures clamping before sensitive ADC front-ends are overstressed. |
| Consumer Power Adapter Input Stage | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side DC output protection in wall adapters subject to user-induced plug-in surges. IC Role / Device Role / Timing Role: Unidirectional suppressor across +VOUT/GND to absorb capacitive discharge spikes. Use Value: 1.0 μA leakage at 40 V preserves no-load efficiency while maintaining fast clamping action. | Use Scenario: Primary protection on Ethernet or RS-485 data lines exposed to field wiring transients. IC Role / Device Role / Timing Role: TVS placed differential-to-ground to suppress common-mode surges per IEC 61000-4-4. Use Value: 500 W rating supports repeated 4 kV EFT bursts without parameter drift or failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ40A | Same DO-214AC package; 40 V VWM, 64.5 V VC @ 7.8 A; identical PPPM and AEC-Q101 qualification | No functional difference; compatible in same PCB footprint with minor layout adjustment for lead spacing | Select SMAJ40A if dual-sourcing or alternate logistics required; verify tape-and-reel packaging compatibility |
| ON Semiconductor 1.5KE40A | Higher power (1500 W), larger DO-201AD package; 40 V VWM, 64.3 V VC @ 23.3 A; not AEC-Q101 qualified | Suitable for high-energy industrial surges but requires board space increase and lacks automotive qualification | Choose 1.5KE40A only for non-automotive systems needing higher single-pulse energy margin |
Compared with SMAJ40A and 1.5KE40A, the SA40A-E3/54 offers identical clamping and automotive qualification in the smaller DO-15 package, enabling compact designs where space and qualification are critical-unlike the larger 1.5KE40A, and more readily available than SMAJ40A in certain regional distribution channels.
Availability
SA40A-E3/54 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and consumer adapter output stage protection requiring stable component supply across production lifecycles.
Supply support for SA40A-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, and protection devices with emphasis on reliability and automotive-grade validation.
The SAxxA series is part of Vishay's TRANSZORB® TVS family, engineered specifically for cost-effective, high-speed transient suppression in 12 V and 24 V systems across automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of SA40A-E3/54 and how is it measured?
The SA40A-E3/54 has a maximum clamping voltage (VC) of 64.5 V, measured at 7.8 A peak pulse current using a 10/1000 μs waveform per IEC 61000-4-5. This value represents the upper voltage limit imposed on protected circuits during surge events and is confirmed in the Vishay datasheet Document Number 88378, page 2. The SA40A-E3/54 maintains this clamping performance across its specified operating temperature range.
Is SA40A-E3/54 qualified for automotive applications?
Yes, the SA40A-E3/54 is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet (Document Number 88378, page 3, Note 1). The E3 suffix indicates RoHS compliance and commercial grade, while the HE3 variant is designated for AEC-Q101. However, the SA40A-E3/54 itself is listed in the AEC-Q101 qualified table in the datasheet, confirming its suitability for automotive use cases such as body control modules and infotainment power rails.
What is the package type and lead finish of SA40A-E3/54?
The SA40A-E3/54 uses the DO-15 (DO-204AC) axial package with matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards. The E3 suffix confirms RoHS compliance and JESD 201 Class 1A whisker resistance. Lead dimensions and mold outline are specified in the datasheet page 5, with 0.130–0.138 inch diameter and 1.0 inch minimum length.
How does SA40A-E3/54 differ from bidirectional variants like SA40CA?
The SA40A-E3/54 is unidirectional, featuring a cathode band for polarity identification and conducting only in reverse avalanche mode, whereas SA40CA is bidirectional with symmetrical clamping in both directions and no polarity marking. The SA40A-E3/54 has lower leakage (1.0 μA vs. up to 2.0 μA for CA types at same VWM) and is suited for DC power line protection, while SA40CA is used in AC or differential signal paths where polarity reversal may occur.
What is the maximum junction temperature and thermal derating behavior of SA40A-E3/54?
The SA40A-E3/54 has a maximum junction temperature (TJ) of 175 °C and derates linearly above 25 °C ambient, as shown in Figure 2 of the Vishay datasheet. At 100 °C ambient, its peak pulse power drops to approximately 60 % of rated 500 W. Steady-state power dissipation is limited to 3.0 W at 75 °C lead temperature (Figure 5), with thermal resistance from junction to leads estimated at ~25 °C/W based on package geometry and material data.
SA40A-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:
- 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 ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA40A-E3/54 FAQ
1.How can I place an order for SA40A-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA40A-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 SA40A-E3/54 reliable?
The price and inventory of SA40A-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 SA40A-E3/54 is usually 5 days.
3.What payment methods are accepted for SA40A-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA40A-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA40A-E3/54?
SA40A-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA40A-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 SA40A-E3/54?
For technical support, including SA40A-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA40A-E3/54 requirements.
6.How does Aetrix verify that SA40A-E3/54 is sourced from the original manufacturer or authorized distributors?
All SA40A-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 SA40A-E3/54 meets industry standards.
7.What is the process for return or replacement of SA40A-E3/54?
All SA40A-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA40A-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 SA40A-E3/54 part is unused and in its original packaging.
Return procedure for SA40A-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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