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Vishay General Semiconductor - Diodes Division SA45A-E3/54
- Part No.:
- SA45A-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA45A-E3/54.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,751
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Product details
Overview
SA45A-E3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode in DO-15 package, designed for overvoltage protection of sensitive electronics. It features a 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR), 72.7 V clamping voltage at 6.9 A peak pulse current, 500 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SA45A-E3/54 datasheet, SA45A-E3/54 pinout, SA45A-E3/54 application, or SA45A-E3/54 equivalent, this device is selected for robust ESD and surge protection on DC power rails and signal lines where fast response (<1 ns), low clamping ratio, and stable junction temperature up to +175 °C are required.
Technical Context
The SA45A-E3/54 operates as a unidirectional avalanche diode with glass-passivated junction, optimized for transient suppression in DC circuits. Its electrical behavior follows standardized IEC 61000-4-2/4-5 and ISO 7637-2 waveforms, delivering consistent clamping performance across -55 °C to +175 °C operating range.
It exhibits 1.0 μA maximum reverse leakage at 45 V, 3.5 V forward voltage at 100 A surge, and 52 mV/°C temperature coefficient of VBR, enabling predictable thermal drift compensation in high-reliability designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin for 48 V nominal systems. |
| VBR (min/max) | 50.0 V / 55.3 V at 1.0 mA - Confirmed avalanche onset range; ensures reliable triggering above system transients but below damage thresholds. |
| VC @ IPPM | 72.7 V at 6.9 A - Clamped voltage during 10/1000 μs surge; limits downstream IC stress to <1.6× VWM. |
| PPPM | 500 W - Peak pulse power handling per single transient; supports repetitive surges at 0.01% duty cycle without degradation. |
| IFSM | 70 A - Non-repetitive 10 ms half-sine surge rating; withstands inductive switch-off events in automotive power distribution. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood or industrial enclosures without derating. |
| Leakage @ VWM | 1.0 μA - Ultra-low reverse current at rated stand-off; avoids parasitic loading on low-power sensor or communication lines. |
Pinout & Package
Package: DO-15 (DO-204AC), axial leaded, epoxy-molded case with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102. Cathode indicated by color band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance return plane; carries full surge current during clamping. |
| Cathode | Protected line connection / Surge sink | Connected to protected node (e.g., 48 V rail or CAN_H); initiates avalanche conduction when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable, repeatable avalanche characteristics over 1000+ surge events without parameter shift. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS power domains. |
| 500 W peak pulse power (10/1000 μs) | Meets ISO 7637-2 Pulse 1, 2a, 3a/b and IEC 61000-4-5 Level 3 requirements without external series impedance. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD >15 kV contact discharge). |
| Solder dip 275 °C / 10 s | Supports standard wave soldering processes without delamination or parametric shift. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs against load dump and alternator transients in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp surges before LDO or DC-DC converter. Use Value: Limits peak voltage to 72.7 V during 100 V/100 ms load dump, preventing overvoltage failure of downstream 80 V-rated MOSFETs and regulators. | Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: TVS mounted at connector interface to absorb induced surges from nearby motor drives or relay switching. Use Value: 1.0 μA leakage preserves 16-bit ADC accuracy; 72.7 V clamping prevents latch-up in op-amp front-ends powered from ±15 V supplies. |
| Telecom DC Power Input Protection | Consumer USB-C PD Port Protection |
Use Scenario: Safeguarding 48 V PoE++ (IEEE 802.3bt) powered devices against cable-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: Primary TVS on PSE-side DC input, upstream of active rectification and isolation. Use Value: 500 W rating handles worst-case 10/1000 μs surges per IEC 61000-4-5; DO-15 footprint allows compact placement near RJ45 jack. | Use Scenario: Secondary overvoltage clamp on USB-C VBUS line after buck-boost controller in portable chargers. IC Role / Device Role / Timing Role: Fast-acting shunt device triggered only during fault conditions (e.g., adapter misconfiguration or cable short). Use Value: 45 V VWM aligns with USB PD 3.0 48 V profile; 72.7 V VC stays below 75 V absolute maximum rating of common GaN FETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A | Same VWM/VBR/VC specs, but SMA package (surface-mount); lower IFSM (40 A vs. 70 A). | Preferred for space-constrained PCBs; unsuitable for high-energy 10 ms surges requiring 70 A IFSM. | Select SMAJ45A only if board layout prohibits axial DO-15 and surge energy is limited to <200 W. |
| 1.5KE45A | Higher PPPM (1500 W), same DO-15 package, but larger case (DO-201AD); higher VC (73 V) and leakage (5.0 μA). | Better for extreme surge environments (e.g., outdoor telecom cabinets); higher leakage may affect precision analog nodes. | Choose 1.5KE45A when system-level testing requires >500 W immunity and leakage tolerance >1 μA is acceptable. |
Compared with SMAJ45A and 1.5KE45A, SA45A-E3/54 delivers optimal balance of high surge current capability (70 A), ultra-low leakage (1.0 μA), and AEC-Q101 qualification-making it the preferred choice for automotive and industrial 48 V systems where reliability and parametric stability are critical.
Availability
SA45A-E3/54 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom DC inputs, and consumer USB-C PD port protection requiring stable component supply and long-term lifecycle support.
Supply support for SA45A-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 AEC-Q qualification.
The SAxxA series is engineered specifically for robust transient suppression in automotive, industrial, and telecom infrastructure-delivering consistent clamping performance under harsh thermal and surge conditions.
FAQ
What is the maximum clamping voltage of SA45A-E3/54 and under what test condition?
The SA45A-E3/54 has a maximum clamping voltage (VC) of 72.7 V, measured at a peak pulse current (IPPM) of 6.9 A using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed per the Vishay datasheet revision 27-Sep-2021 (Document Number: 88378), and reflects worst-case clamping performance at TA = 25 °C.
Is SA45A-E3/54 suitable for automotive applications?
Yes, SA45A-E3/54 is AEC-Q101 qualified and explicitly listed in the "Notes" section of the Vishay datasheet (page 3, Note 1). Its DO-15 package, 175 °C max junction temperature, and validated surge performance make it suitable for engine control, body electronics, and ADAS power domains where automotive-grade reliability is mandatory.
What does the "E3/54" suffix mean in SA45A-E3/54?
The "E3" suffix indicates RoHS-compliant, commercial-grade construction with JESD 201 Class 1A whisker resistance; "/54" denotes the preferred package code for 13-inch paper tape and reel packaging, with a base quantity of 4000 units per reel. This matches the ordering information table in the Vishay datasheet (page 3).
How does SA45A-E3/54 differ from bidirectional SA45CA?
SA45A-E3/54 is unidirectional with cathode marking and conducts only in reverse bias; SA45CA is bidirectional with no polarity marking and clamps in both directions. The SA45A-E3/54 has lower leakage (1.0 μA vs. 600 μA for SA45CA at VWM) and is intended for DC rail protection, whereas SA45CA suits AC-coupled or differential signal lines like RS-485 or CAN.
Can SA45A-E3/54 be used in parallel for higher surge current handling?
No-SA45A-E3/54 is not characterized or recommended for parallel operation. Mismatched VBR tolerances (50.0–55.3 V) cause current imbalance, leading to premature failure of one device. For higher surge capacity, select a single higher-rated part (e.g., 1.5KE45A) or implement staged protection with series impedance.
SA45A-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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 6.9A
- 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)
SA45A-E3/54 FAQ
1.How can I place an order for SA45A-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA45A-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 SA45A-E3/54 reliable?
The price and inventory of SA45A-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 SA45A-E3/54 is usually 5 days.
3.What payment methods are accepted for SA45A-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA45A-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA45A-E3/54?
SA45A-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA45A-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 SA45A-E3/54?
For technical support, including SA45A-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA45A-E3/54 requirements.
6.How does Aetrix verify that SA45A-E3/54 is sourced from the original manufacturer or authorized distributors?
All SA45A-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 SA45A-E3/54 meets industry standards.
7.What is the process for return or replacement of SA45A-E3/54?
All SA45A-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA45A-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 SA45A-E3/54 part is unused and in its original packaging.
Return procedure for SA45A-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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