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Vishay General Semiconductor - Diodes Division SA45C-E3/73
- Part No.:
- SA45C-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA45C-E3/73.pdf
- Description:
- TVS DIODE 45VWM 80.3VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,634
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Product details
Overview
SA45C-E3/73 from Vishay General Semiconductor is a bi-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for clamping voltage transients on signal or power lines. It features 45 V stand-off voltage (VWM), 500 W peak pulse power (10/1000 µs), clamping voltage of 72.7 V at 6.9 A peak pulse current, and operates across –55 °C to +175 °C junction temperature - deployed in automotive sensor interface protection and industrial I/O line surge suppression.
For engineers reviewing the SA45C-E3/73 datasheet, SA45C-E3/73 pinout, SA45C-E3/73 application, or SA45C-E3/73 equivalent, this page delivers verified electrical specs, polarity-free terminal behavior, AEC-Q101 qualification status, thermal derating curves, and direct replacement guidance for bi-directional TVS selection in high-reliability 12 V/24 V systems.
Technical Context
The SA45C-E3/73 implements a glass-passivated silicon junction optimized for fast response (<1 ps) to ESD and lightning-induced transients. Its bi-directional architecture enables symmetrical clamping in AC-coupled or floating circuits without polarity constraints, with breakdown voltage (VBR) specified at 50.0–55.3 V (min/max) under 1 mA test current.
It complies with AEC-Q101 stress testing for automotive use and supports repetitive surge events at ≤0.01% duty cycle. The device exhibits low incremental surge resistance and maintains stable clamping performance up to TJ = 175 °C, with thermal derating defined per Fig. 5 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for 12 V/24 V bus interfaces. |
| VBR (min/max) | 50.0 V / 55.3 V at IT = 1 mA - Ensures predictable turn-on threshold across production lot and temperature. |
| VC @ IPPM | 72.7 V at 6.9 A (10/1000 µs) - Clamping voltage limits downstream IC stress during 500 W transient events. |
| PPPM | 500 W - Peak pulse power handling capability for standardized lightning/surge immunity per IEC 61000-4-5. |
| IPPM | 6.9 A - Peak pulse current capacity directly derived from VC and PPPM; used for PCB trace sizing and fuse coordination. |
| TJ max. | +175 °C - Enables operation in under-hood automotive environments and high-ambient industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD-HBM/MM. |
Pinout & Package
Package: DO-204AC (DO-15), axial-leaded, molded epoxy case meeting UL 94 V-0. Bi-directional construction means no cathode marking; terminals are symmetric and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (either end) | Bi-directional transient clamp node | Either lead connects to protected line; no polarity dependency - simplifies layout and eliminates orientation errors. |
| Case / Body | Non-conductive encapsulation | Provides mechanical protection and electrical isolation; no thermal pad or metal tab - heat dissipation via leads only. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable VBR tolerance and long-term reliability under humidity and thermal cycling. |
| 500 W peak pulse power (10/1000 µs) | Meets IEC 61000-4-5 Level 3/4 surge requirements for industrial and automotive electronics. |
| AEC-Q101 qualification | Validates suitability for automotive body control modules, ADAS sensor interfaces, and infotainment power rails. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on downstream MOSFETs, op-amps, or microcontroller I/O pins. |
| Matte tin-plated leads | Ensures solderability per J-STD-002 and whisker resistance per JESD 201 Class 1A (E3 suffix). |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
|
Use Scenario: Protecting CAN/LIN transceiver data lines and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role: Bi-directional clamping element placed between signal line and ground, absorbing transients without DC bias dependency. Use Value: Maintains signal integrity during 12 V battery system surges up to ±100 V, with VC limiting voltage seen by 5 V ADC front-end to <73 V. |
Use Scenario: Shielding 4–20 mA current loop inputs in programmable logic controllers against field-wiring induced surges and ESD. IC Role / Device Role: Line-to-ground TVS on input terminals, operating symmetrically across bidirectional current flow paths. Use Value: Prevents latch-up in precision instrumentation amplifiers by clamping transients within 1 ns, with no forward conduction during normal operation. |
| Telecom Power Feeding | Consumer Appliance Motor Control |
|
Use Scenario: Safeguarding PoE-powered Ethernet PHYs and auxiliary DC feeds in telecom base stations exposed to lightning-induced common-mode surges. IC Role / Device Role: Secondary-level bi-directional clamp on isolated DC feed lines, complementing primary MOV/GDT stages. Use Value: Adds fast-response layer with precise VWM = 45 V to avoid false triggering on nominal 48 V PoE voltages while clamping >100 V spikes. |
Use Scenario: Suppressing inductive kickback from brushed DC motors in washing machines and HVAC blowers connected to microcontroller GPIOs. IC Role / Device Role: Low-capacitance (<100 pF) transient suppressor across motor terminals and MCU driver outputs. Use Value: Eliminates reset events caused by 100 V+ switching spikes, leveraging 175 °C rating for sustained operation near hot motor housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CA | Same VWM (45 V), lower PPPM (400 W), SMA package (surface-mount) | Requires PCB rework for SMT assembly; lacks AEC-Q101 qualification | Select when board space is constrained and automotive qualification is not required. |
| 1.5KE45CA | Same VWM (45 V), higher PPPM (1500 W), DO-201AD package (larger axial) | Higher surge margin but larger footprint and higher clamping voltage (73.0 V) | Select when legacy through-hole compatibility and higher single-pulse robustness are prioritized over size and thermal efficiency. |
Compared with SA45C-E3/73, SMAJ45CA trades AEC-Q101 compliance and power density for SMT compatibility, while 1.5KE45CA offers greater pulse energy handling at the cost of larger DO-201AD packaging and reduced thermal responsiveness in compact enclosures.
Availability
SA45C-E3/73 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom power feeding requiring stable component supply across extended temperature ranges and AEC-Q101-compliant sourcing.
Supply support for SA45C-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, efficiency, and automotive-grade validation.
The SAxxC series was engineered specifically for bi-directional transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where polarity-agnostic clamping and AEC-Q101 compliance are mandatory.
FAQ
What is the polarity configuration of SA45C-E3/73?
The SA45C-E3/73 is a bi-directional TVS diode with no cathode marking and symmetric terminal behavior. Either lead may connect to the protected line or ground, enabling flexible placement in AC-coupled or floating circuits without orientation constraints - a key advantage over uni-directional variants like SA45A-E3/73.
Does SA45C-E3/73 meet AEC-Q101 requirements?
Yes, SA45C-E3/73 is AEC-Q101 qualified, having passed stress tests including high-temperature operating life (HTOL), temperature cycling (TC), unbiased highly accelerated stress test (UHAST), and ESD-HBM/MM. This qualification confirms its suitability for automotive electronic control units and sensor modules.
What is the maximum clamping voltage for SA45C-E3/73 under surge conditions?
The SA45C-E3/73 clamps to 72.7 V at 6.9 A peak pulse current (10/1000 µs waveform), as specified in the Vishay datasheet. This value ensures downstream components see limited overvoltage during standardized surge events, with VC remaining stable across temperature and aging.
Can SA45C-E3/73 replace SA45A-E3/73 in existing designs?
No - SA45C-E3/73 is bi-directional while SA45A-E3/73 is uni-directional with cathode marking. Substitution requires verifying circuit topology: SA45C-E3/73 is appropriate for AC or floating lines, whereas SA45A-E3/73 must be oriented correctly in DC-biased paths. Layout changes may be needed to accommodate polarity independence.
What is the thermal derating behavior of SA45C-E3/73 above 25 °C ambient?
SA45C-E3/73 follows the steady-state power derating curve in Fig. 5 of the datasheet: its 3.0 W power dissipation drops linearly to zero at 175 °C junction temperature. At 75 °C lead temperature (TL), rated power reduces to 3.0 W; beyond that, thermal design must ensure TJ ≤ 175 °C using trace width, copper area, and airflow.
SA45C-E3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SA45C-E3/73 FAQ
1.How can I place an order for SA45C-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA45C-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 SA45C-E3/73 reliable?
The price and inventory of SA45C-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 SA45C-E3/73 is usually 5 days.
3.What payment methods are accepted for SA45C-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA45C-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA45C-E3/73?
SA45C-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA45C-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 SA45C-E3/73?
For technical support, including SA45C-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA45C-E3/73 requirements.
6.How does Aetrix verify that SA45C-E3/73 is sourced from the original manufacturer or authorized distributors?
All SA45C-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 SA45C-E3/73 meets industry standards.
7.What is the process for return or replacement of SA45C-E3/73?
All SA45C-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA45C-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 SA45C-E3/73 part is unused and in its original packaging.
Return procedure for SA45C-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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