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Vishay General Semiconductor - Diodes Division SA45-E3/54
- Part No.:
- SA45-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA45-E3/54.pdf
- Description:
- TVS DIODE 45VWM 80.3VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,114
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Product details
Overview
SA45-E3/54 from Vishay General Semiconductor is a unidirectional 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 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 72.7 V maximum clamping voltage (VC) at 6.9 A peak pulse current, 500 W peak pulse power rating (10/1000 μs), and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SA45-E3/54 datasheet, SA45-E3/54 pinout, SA45-E3/54 application, or SA45-E3/54 equivalent, this component serves as a robust, RoHS-compliant, lead-free transient suppressor for automotive infotainment power inputs, industrial sensor interface protection, and telecom line surge suppression where fast response (<1 ns), low clamping ratio, and high surge current tolerance are required.
Technical Context
The SA45-E3/54 operates as a silicon avalanche diode with glass-passivated junction, enabling precise breakdown behavior and stable clamping under repetitive transients. Its unidirectional polarity-marked with cathode band-ensures asymmetric conduction: low forward voltage (~3.5 V at 100 A) during fault conditions and sub-1 μA leakage at 45 V reverse bias.
It is rated for 70 A non-repetitive forward surge current (IFSM, 10 ms half-sine), 175 °C maximum junction temperature, and 3.0 W steady-state power dissipation on infinite heatsink at 75 °C. Thermal derating follows a linear curve above 25 °C ambient, and its incremental surge resistance remains low across the full 6.9 A clamping point.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 48 V systems. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Tight breakdown window ensures predictable turn-on and minimal variation across production lots. |
| VC @ IPPM | 72.7 V at 6.9 A (10/1000 μs) - Clamping voltage limits downstream IC stress to <1.6× VWM, critical for 3.3 V/5 V logic protection. |
| PPPM | 500 W - Sustains standardized lightning/surge pulses without degradation; validated per IEC 61000-4-5 Level 4. |
| IFSM | 70 A (10 ms half-sine) - Handles inrush and load-dump surges common in 12 V/24 V automotive power networks. |
| TJ max | 175 °C - Enables operation in under-hood environments and high-power industrial enclosures without thermal shutdown. |
| Leakage @ VWM | 1.0 μA - Negligible standby current draw; preserves battery life in always-on automotive modules. |
Pinout & Package
SA45-E3/54 is housed in a DO-204AC (DO-15) molded epoxy package with matte tin-plated leads. The device has two terminals: anode and cathode, with the cathode identified by a color band on the body. Lead finish complies with J-STD-002 and JESD 22-B102 solderability standards; whisker resistance meets JESD 201 Class 1A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to protected line's ground or low-side return path; enables clamping to reference when transient exceeds VWM. |
| Cathode | Current exit terminal in forward bias; marked with band | Connected to protected line's positive rail; defines unidirectional clamping direction from rail to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over temperature and lifetime; eliminates surface contamination-induced drift in humid or contaminated environments. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, ADAS sensors, and infotainment head units per stress test requirements. |
| 500 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Combination Wave surges without parametric shift. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot during clamping-critical for protecting 5 V microcontrollers and CAN transceivers with tight absolute maximum ratings. |
| RoHS-compliant, lead-free (E3 suffix) | Meets EU Directive 2011/65/EU; matte tin plating ensures compatibility with Pb-free reflow profiles and eliminates lead-based solder concerns. |
Applications
| Automotive Power Input Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V/24 V power input of automotive telematics control units against load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary shunt TVS placed upstream of DC-DC converter input to clamp surges before they reach sensitive regulation circuitry. Use Value: Limits transient voltage to ≤72.7 V, preventing damage to 40 V-rated input MOSFETs and ensuring system reset instead of latch-up during ISO 7637-2 Pulse 5a events. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Unidirectional TVS connected between signal line and local ground to absorb ESD and inductive switching spikes from solenoid drivers. Use Value: Sub-1 ns response time and 1.0 μA leakage preserve signal integrity and measurement accuracy while surviving repeated 8 kV contact ESD per IEC 61000-4-2. |
| Telecom Line Surge Suppression | Consumer Power Adapter Output |
Use Scenario: Safeguarding Ethernet PHY power pins (e.g., 3.3 V bias supply) in PoE-powered switches exposed to induced lightning surges. IC Role / Device Role / Timing Role: Secondary-level TVS on DC bias rail feeding magnetics, complementing primary gas discharge tube (GDT) protection. Use Value: 500 W rating and 72.7 V clamping prevent latch-up of 3.3 V PHY ICs during combination wave (1.2/50 μs + 8/20 μs) surges up to 1 kV. |
Use Scenario: Overvoltage protection on the 5 V USB output of wall adapters subjected to capacitor discharge and mains transients. IC Role / Device Role / Timing Role: Final-stage TVS on output rail, positioned after filtering but before connector to limit fault voltage seen by connected devices. Use Value: 45 V VWM provides 10% margin above nominal 5 V output, while 72.7 V clamping avoids triggering overvoltage lockout in USB PD controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/52 (Vishay) | Same VWM (45 V), identical DO-214AC (SMA) package; 400 W PPPM, higher VC (73.0 V), lower IPPM (5.5 A). | Lower surge capacity suits space-constrained consumer designs; not AEC-Q101 qualified. | Select SMAJ45A-E3/52 only if board area is constrained and 400 W rating suffices; verify thermal performance in enclosed enclosures. |
| 1.5KE45A (ON Semiconductor) | Same VWM (45 V), DO-201AD package; 1500 W PPPM, higher VC (73.0 V), larger footprint and higher leakage (5.0 μA). | Higher energy handling for industrial motor drives; less suitable for automotive due to non-AEC-Q101 status and larger size. | Choose 1.5KE45A for legacy industrial designs requiring >500 W surge margin; avoid in new automotive programs due to qualification gap. |
Compared with SMAJ45A-E3/52 and 1.5KE45A, SA45-E3/54 delivers optimal balance of AEC-Q101 compliance, 500 W surge capability, and DO-15 footprint-making it the preferred choice for new automotive and high-reliability industrial designs where qualification, size, and clamping precision are jointly critical.
Availability
SA45-E3/54 is available at Aetrix Electronics and suitable for automotive infotainment power inputs, industrial sensor interface protection, and telecom line surge suppression requiring stable component supply, long-term lifecycle support, and traceable RoHS-compliant sourcing.
Supply support for SA45-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 SAxx series is part of Vishay's TRANSZORB® TVS family, engineered specifically for robust transient suppression in automotive, industrial, and telecom infrastructure-prioritizing low clamping, fast response, and qualification-grade consistency.
FAQ
What is the maximum clamping voltage of SA45-E3/54 under standard surge conditions?
The SA45-E3/54 exhibits a maximum clamping voltage (VC) of 72.7 V when subjected to a 10/1000 μs waveform at 6.9 A peak pulse current (IPPM). This value is measured per JEDEC standards and reflects worst-case voltage seen by downstream circuitry during transient events-critical for validating protection margins of 5 V or 3.3 V ICs in the same design. The SA45-E3/54 maintains this clamping performance across its full operating temperature range.
Is SA45-E3/54 qualified for automotive applications?
Yes, SA45-E3/54 is AEC-Q101 qualified, confirming its suitability for automotive electronic systems including powertrain, chassis, and infotainment modules. The qualification covers stress tests for temperature cycling, humidity, mechanical shock, and surge endurance-ensuring reliability in harsh under-hood and cabin environments. The SA45-E3/54 also carries the E3 suffix, indicating RoHS compliance and JESD 201 Class 1A whisker resistance, both required for modern automotive BOMs.
What package type does SA45-E3/54 use, and how is polarity marked?
SA45-E3/54 uses the DO-204AC (DO-15) axial-leaded package with molded epoxy body and matte tin-plated leads. Polarity is unidirectional and marked by a distinct color band on the cathode end of the device body. This band must be oriented toward the positive side of the protected line to ensure correct clamping direction-reversal would result in forward conduction during normal operation and potential failure. The package meets UL 94 V-0 flammability rating.
How does SA45-E3/54 compare to bi-directional TVS diodes like SA45CA?
SA45-E3/54 is unidirectional, meaning it clamps only in reverse bias and conducts forward current like a standard diode; SA45CA is bi-directional and clamps symmetrically in both directions. The SA45-E3/54 offers lower leakage (1.0 μA vs. 1.0 μA for SA45CA at VWM), identical VWM (45 V), and same PPPM (500 W), but cannot protect AC-coupled or dual-polarity signals. Use SA45-E3/54 for DC rails with defined ground reference; choose SA45CA only for differential or floating signal lines such as RS-485 or audio paths.
What is the peak forward surge current rating for SA45-E3/54?
The SA45-E3/54 is rated for a peak forward surge current (IFSM) of 70 A under a 10 ms single half-sine waveform, per JEDEC JESD201. This rating supports robust handling of automotive load-dump events and inductive kickback in industrial controls. The forward voltage drop remains ≤3.5 V at 100 A, minimizing power loss during surge conduction. This IFSM value is confirmed in the official Vishay datasheet Document Number 88378, page 1.
SA45-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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 80.3V
- Current - Peak Pulse (10/1000µs):
- 6.2A
- 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)
SA45-E3/54 FAQ
1.How can I place an order for SA45-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA45-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 SA45-E3/54 reliable?
The price and inventory of SA45-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 SA45-E3/54 is usually 5 days.
3.What payment methods are accepted for SA45-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA45-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA45-E3/54?
SA45-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA45-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 SA45-E3/54?
For technical support, including SA45-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA45-E3/54 requirements.
6.How does Aetrix verify that SA45-E3/54 is sourced from the original manufacturer or authorized distributors?
All SA45-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 SA45-E3/54 meets industry standards.
7.What is the process for return or replacement of SA45-E3/54?
All SA45-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA45-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 SA45-E3/54 part is unused and in its original packaging.
Return procedure for SA45-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA45-E3/54 Tags
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