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onsemi SA45CA
- Part No.:
- SA45CA
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA45CA.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:4,543
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Product details
Overview
SA45CA from Fairchild Semiconductor is a 500 W bidirectional transient voltage suppressor (TVS) diode in DO-15 package, with 45 V reverse stand-off voltage (VRWM), 50.0–55.3 V breakdown voltage (VBR), and 72.7 V clamping voltage (VC) at 6.9 A peak pulse current (IPPM) on 10/1000 μs waveform - used for surge protection in AC power inputs and telecom line interfaces.
For engineers reviewing the SA45CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping symmetry, low incremental surge resistance, sub-5 ns response time, IR < 1.0 μA at VRWM, and DO-15 thermal derating compliance up to +175°C junction temperature.
Technical Context
The SA45CA operates as a bipolar junction TVS device with symmetrical clamping in both directions, enabling robust protection against positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance and low leakage across temperature.
Designed for 10/1000 μs surge waveforms per R.E.A., it delivers 500 W peak pulse power with fast turn-on (< 5.0 ns response) and maintains clamping performance under repetitive surge stress up to 4 pulses/minute at 8.3 ms half-sine waveform per JEDEC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPPM) | 500 W on 10/1000 μs waveform - defines maximum single-event surge energy handling capability |
| Reverse Stand-off Voltage (VRWM) | 45 V - maximum continuous operating voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 50.0–55.3 V at 1.0 mA - precise conduction onset threshold for bidirectional clamping |
| Clamping Voltage (VC) | 72.7 V at 6.9 A IPPM - limits protected circuit voltage during surge events |
| Peak Pulse Current (IPPM) | 6.9 A on 10/1000 μs waveform - quantifies surge current capacity at rated clamping level |
| Reverse Leakage (IR) | < 1.0 μA at VRWM - ensures minimal standby power loss and signal integrity in high-impedance circuits |
| Junction Temperature (TJ) | +175 °C - supports operation in high-ambient industrial and automotive under-hood environments |
Pinout & Package
SA45CA is housed in a DO-15 axial-leaded package with no cathode band (standard for bidirectional TVS devices). Leads are tinned and rated for 0.375" lead length at 75°C ambient for 1.0 W steady-state dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current entry point (negative transient) | Conducts during negative excursions; symmetric with cathode for bidirectional clamping |
| Cathode | Surge current entry point (positive transient) | Conducts during positive excursions; identical electrical behavior to anode due to CA suffix design |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over temperature and long-term reliability in humid or contaminated environments |
| 500 W peak pulse power rating | Supports IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 kV line-to-ground) surge immunity testing |
| Sub-5 ns response time | Enables effective suppression of fast-rising ESD and lightning-induced transients before downstream IC damage occurs |
| Symmetrical bidirectional clamping | Eliminates need for polarity-aware placement; simplifies PCB layout and reduces BOM count in AC-coupled systems |
Applications
| AC Power Input Protection | Telecom Line Interface |
|---|---|
Use Scenario: Protecting AC mains input stages of industrial power supplies and motor drives from lightning-induced surges and switching transients. IC Role / Device Role / Timing Role: Primary surge clamp placed across L-N or L/N-PE lines to limit transient overvoltage before rectification and filtering. Use Value: Clamps 45 V AC-derived transients to ≤72.7 V within 5 ns, preventing damage to bridge rectifiers and bulk capacitors. | Use Scenario: Safeguarding analog and digital subscriber line (DSL/POTS) interface circuits from induced surges on twisted-pair telephone lines. IC Role / Device Role / Timing Role: Bidirectional shunt protector between tip/ring conductors and ground, referenced to system common. Use Value: Symmetrical clamping preserves signal integrity on full-duplex lines while meeting GR-1089-CORE lightning surge requirements. |
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
Use Scenario: Suppressing load dump and ISO 7637-2 pulse 5a/b transients on 12 V battery-fed modules in passenger vehicles. IC Role / Device Role / Timing Role: Secondary-level TVS placed after primary fusing and upstream of linear regulators or CAN transceivers. Use Value: Withstands 175°C junction temperature and clamps 12 V system transients to safe levels for 5 V/3.3 V logic rails. | Use Scenario: Shielding 4–20 mA current loop or RS-485 transceiver inputs from EFT and surge coupling in factory automation sensors. IC Role / Device Role / Timing Role: Low-leakage (≤1 μA) bidirectional clamp across differential signal pairs or supply rails. Use Value: Prevents false triggering and latch-up in precision analog front-ends without adding offset or noise via leakage current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45CA | DO-214AA (SMB) package; same VRWM/VBR/VC specs; higher thermal mass but larger footprint | Better suited for surface-mount assembly and higher board density; requires rework of pad layout | Select when automated SMT production and improved thermal cycling endurance are prioritized over through-hole compatibility |
| P6KE45CA | DO-15 package; lower PPPM (600 W); wider VBR tolerance (45–50.6 V); higher VC (73.0 V) | Legacy alternative with looser parametric control; acceptable where tighter clamping is not critical | Choose only if legacy inventory or cross-compatibility with older designs is required |
Compared with SMBJ45CA and P6KE45CA, the SA45CA offers optimal balance of DO-15 through-hole manufacturability, tight 50.0–55.3 V VBR window, and 72.7 V clamping - making it preferred for cost-sensitive industrial controls requiring proven reliability and easy hand-soldering serviceability.
Availability
SA45CA is available at Aetrix Electronics and suitable for AC power input protection, telecom line interface, and automotive body control module applications requiring stable component supply, long-lifecycle support, and traceable sourcing from authorized channels.
Supply support for SA45CA 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
Fairchild Semiconductor was a leading designer and manufacturer of power semiconductors, analog ICs, and discrete components, acquired by ON Semiconductor in 2016; its legacy TVS portfolio remains widely deployed in industrial and automotive systems.
The SAxxCA series was engineered specifically for high-reliability bidirectional surge suppression in harsh environments - emphasizing low leakage, tight VBR distribution, and robust thermal performance in axial-leaded packages.
FAQ
What is the clamping voltage of the SA45CA at its rated peak pulse current?
The SA45CA has a maximum clamping voltage (VC) of 72.7 V at its rated peak pulse current (IPPM) of 6.9 A on a 10/1000 μs waveform. This value is measured under standardized surge conditions and defines the upper voltage limit imposed on protected circuits during transient events. The SA45CA maintains this clamping performance consistently across its specified operating temperature range, ensuring predictable protection behavior in real-world applications.
Is the SA45CA unidirectional or bidirectional, and how does that affect its use in circuit design?
The SA45CA is a bidirectional TVS diode, indicated by the "CA" suffix, meaning it provides symmetrical clamping for both positive and negative transients. This eliminates polarity sensitivity during placement - unlike unidirectional types that require correct anode/cathode orientation. In circuit design, the SA45CA can be placed across AC lines, differential signal pairs, or any node subject to voltage reversals without risk of incorrect installation or failure to protect one polarity of surge.
What is the maximum junction temperature rating for the SA45CA, and why is it important?
The SA45CA is rated for a maximum operating junction temperature (TJ) of +175°C. This high-temperature capability allows reliable operation in demanding environments such as automotive engine compartments, industrial motor drives, and enclosed power supplies where ambient temperatures exceed 100°C. Maintaining functionality at elevated TJ ensures sustained clamping performance and long-term reliability without thermal runaway or parameter drift - a critical factor for safety-critical surge protection.
How does the SA45CA's reverse leakage current compare to other TVS diodes in its class?
The SA45CA specifies a maximum reverse leakage current (IR) of less than 1.0 μA at its 45 V reverse stand-off voltage (VRWM), which is among the lowest in the DO-15 500 W TVS family. This ultra-low leakage minimizes power loss in high-impedance sensing circuits and prevents false triggering in precision analog systems. Compared to alternatives like P6KE45CA (same IR spec) or older SMAJ45CA variants (often ≥5 μA), the SA45CA delivers superior signal integrity retention in battery-powered or low-power sensor interfaces.
Can the SA45CA be used as a direct replacement for the P6KE45CA in existing designs?
The SA45CA shares the DO-15 package and similar electrical specifications with the P6KE45CA, but it is not a guaranteed drop-in replacement due to differences in peak pulse power rating (500 W vs. 600 W), VBR range (50.0–55.3 V vs. 45–50.6 V), and clamping voltage (72.7 V vs. 73.0 V). While many designs tolerate these variances, validation of surge margin and thermal performance is required before substitution. The SA45CA should be selected based on its tighter VBR tolerance and lower leakage - not assumed interchangeable without testing.
SA45CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-15
SA45CA FAQ
1.How can I place an order for SA45CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SA45CA 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 reliable?
The price and inventory of SA45CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA45CA is usually 5 days.
3.What payment methods are accepted for SA45CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA45CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA45CA?
SA45CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA45CA 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?
For technical support, including SA45CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA45CA requirements.
6.How does Aetrix verify that SA45CA is sourced from the original manufacturer or authorized distributors?
All SA45CA 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 meets industry standards.
7.What is the process for return or replacement of SA45CA?
All SA45CA units undergo pre-shipment inspection (PSI). If there is an issue with SA45CA, 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 part is unused and in its original packaging.
Return procedure for SA45CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA45CA Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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