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Vishay General Semiconductor - Diodes Division SA45CA-E3/73
- Part No.:
- SA45CA-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA45CA-E3/73.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,430
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Product details
Overview
SA45CA-E3/73 from Vishay General Semiconductor is a bidirectional Transient Voltage Suppressor (TVS) diode in DO-15 package, designed for clamping voltage transients on signal or power lines. It features 500 W peak pulse power (10/1000 μs), 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR at 1.0 mA), and clamps to ≤72.7 V at 6.9 A peak pulse current - used in automotive sensor protection and industrial I/O interface surge suppression.
For engineers reviewing the SA45CA-E3/73 datasheet, SA45CA-E3/73 pinout, SA45CA-E3/73 application, or SA45CA-E3/73 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, DO-15 mechanical compatibility, low leakage (<1.0 μA at 45 V), and thermal stability up to +175 °C junction temperature.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche breakdown in both polarities, enabling robust ESD and lightning surge immunity without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance (±5 %) and low incremental surge resistance, critical for fast transient response under repetitive 0.01 % duty cycle conditions.
The SA45CA-E3/73 is rated for 3.0 W steady-state power dissipation at 75 °C lead temperature and supports surge currents up to 6.9 A (10/1000 μs), with clamping voltage tightly bounded at 72.7 V - directly limiting stress on downstream ICs such as CAN transceivers or microcontroller GPIOs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - maximum continuous reverse operating voltage before conduction begins; defines safe working margin below breakdown. |
| VBR (min/max) | 50.0 V / 55.3 V at 1.0 mA - precise avalanche onset range ensuring predictable clamping threshold across production lots. |
| VC @ IPPM | 72.7 V at 6.9 A - maximum clamped voltage during 10/1000 μs surge; determines worst-case stress on protected circuitry. |
| PPPM | 500 W - peak pulse power handling capacity; enables compliance with IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge testing. |
| ID @ VWM | <1.0 μA - ultra-low reverse leakage at stand-off voltage; prevents signal distortion or bias shift in high-impedance interfaces. |
| TJ max | +175 °C - extended junction temperature rating supporting under-hood automotive and industrial ambient environments. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per JESD47. |
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. Bidirectional construction means no polarity marking; both terminals are functionally identical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals conduct identically during overvoltage events in either polarity; no cathode band marking required. |
| Lead 1 / Lead 2 | PCB interconnect interface | Leads support soldering at 275 °C for 10 s (JESD 22-B106); whisker-resistant per JESD 201 Class 1A (E3 suffix). |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance (±5 %) and long-term parameter consistency across thermal and humidity stress. |
| 500 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 surge immunity up to 1 kV open-circuit / 0.5 kA short-circuit test levels. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during transients, reducing risk of latch-up or gate oxide damage in protected MOSFETs or ICs. |
| UL 94 V-0 molding compound | Provides flame-retardant housing essential for safety-critical industrial and transportation equipment. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) in engine control modules from load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across sensor signal line and ground to shunt transient energy before it reaches ADC input or signal conditioner. Use Value: Limits voltage excursion to ≤72.7 V during 6.9 A surges, preserving signal integrity and preventing ADC saturation or front-end damage. | Use Scenario: Shielding digital input channels of programmable logic controllers from field-wiring induced surges in factory automation systems. IC Role / Device Role / Timing Role: Standoff protector mounted at connector entry point to divert EFT/burst energy away from optocoupler or Schmitt trigger inputs. Use Value: Maintains <1.0 μA leakage at 45 V, avoiding false triggering while clamping 10/1000 μs transients within safe logic-level margins. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Safeguarding RS-485 transceiver bus lines against lightning-induced surges in outdoor network equipment. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) referenced to ground, leveraging symmetrical breakdown to suppress differential and common-mode transients. Use Value: Delivers matched clamping performance (VC ≤72.7 V) on both lines, preserving differential signaling integrity during multi-kV surge events. | Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances like washing machines or HVAC blowers. IC Role / Device Role / Timing Role: Across-the-line protector bridging motor terminals to absorb inductive kickback energy during MOSFET/FET switching transitions. Use Value: Handles repetitive 500 W pulses at 0.01 % duty cycle without degradation, extending motor driver lifespan and reducing EMI emissions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CA | Same VWM (45 V) and PPPM (400 W), but SMA package (smaller footprint, lower IPPM = 5.9 A) | Preferred for space-constrained PCBs where thermal mass is managed externally; not AEC-Q101 qualified | Select when board area is limited and automotive qualification is not required. |
| 1.5KE45CA | Higher PPPM (1500 W), DO-204AL package, same VWM/VBR range, but larger size and higher clamping voltage (73.0 V) | Better suited for primary-side AC line protection or high-energy industrial surge zones | Choose for higher energy absorption where DO-15 mechanical fit is acceptable and tighter clamping is secondary. |
Compared with SMAJ45CA and 1.5KE45CA, the SA45CA-E3/73 offers AEC-Q101 qualification and optimized clamping (72.7 V) in the industry-standard DO-15 through-hole package - making it ideal for automotive and industrial applications requiring proven reliability and legacy board compatibility.
Availability
SA45CA-E3/73 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer appliance motor control requiring stable component supply and long-term lifecycle support.
Supply support for SA45CA-E3/73 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, precision, and application-specific optimization.
The SAxxCA series is part of Vishay's TRANSZORB® TVS portfolio, engineered specifically for bidirectional transient suppression in harsh environments including automotive, industrial, and telecommunications infrastructure.
FAQ
What is the breakdown voltage range of the SA45CA-E3/73?
The SA45CA-E3/73 has a minimum breakdown voltage (VBR) of 50.0 V and a maximum of 55.3 V at 1.0 mA test current, measured per ANSI/IEEE C62.35. This tight ±5.5 % tolerance ensures consistent clamping behavior across production units and supports reliable design margining in safety-critical circuits.
Is the SA45CA-E3/73 suitable for automotive applications?
Yes, the SA45CA-E3/73 is AEC-Q101 qualified and explicitly rated for automotive use. Its construction - including glass-passivated junction, DO-15 package with matte tin leads, and operation up to +175 °C junction temperature - meets requirements for engine bay, chassis, and ADAS sensor interface applications where reliability under thermal and vibration stress is mandatory.
Does the SA45CA-E3/73 have polarity markings?
No, the SA45CA-E3/73 is a bidirectional TVS diode and carries no polarity marking. Both terminals are functionally identical, allowing installation without orientation concern - a key advantage for automated assembly and maintenance of symmetric protection schemes on differential or AC-coupled signal paths.
What is the maximum clamping voltage of the SA45CA-E3/73 under surge conditions?
The SA45CA-E3/73 clamps to a maximum of 72.7 V when subjected to its rated peak pulse current of 6.9 A (10/1000 μs waveform). This value is guaranteed per datasheet specifications and defines the upper voltage limit imposed on protected circuitry during standardized surge events, enabling accurate overvoltage margin analysis.
How does the SA45CA-E3/73 compare to unidirectional TVS diodes in circuit design?
The SA45CA-E3/73 eliminates the need for polarity-aware layout or external biasing networks required by unidirectional TVS diodes. Its symmetrical breakdown allows direct placement across AC signals, transformer-coupled lines, or bidirectional data buses (e.g., RS-485), simplifying schematic design and reducing bill-of-materials count compared to dual-unidirectional solutions.
SA45CA-E3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SA45CA-E3/73 FAQ
1.How can I place an order for SA45CA-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA45CA-E3/73 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 SA45CA-E3/73 reliable?
The price and inventory of SA45CA-E3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA45CA-E3/73 is usually 5 days.
3.What payment methods are accepted for SA45CA-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA45CA-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA45CA-E3/73?
SA45CA-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA45CA-E3/73 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 SA45CA-E3/73?
For technical support, including SA45CA-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA45CA-E3/73 requirements.
6.How does Aetrix verify that SA45CA-E3/73 is sourced from the original manufacturer or authorized distributors?
All SA45CA-E3/73 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 SA45CA-E3/73 meets industry standards.
7.What is the process for return or replacement of SA45CA-E3/73?
All SA45CA-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA45CA-E3/73, 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 SA45CA-E3/73 part is unused and in its original packaging.
Return procedure for SA45CA-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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