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onsemi SA70CA
- Part No.:
- SA70CA
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA70CA.pdf
- Description:
- TVS DIODE 70VWM 113VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:4,941
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Product details
Overview
SA70CA from Fairchild Semiconductor is a 500 W bidirectional transient voltage suppressor (TVS) diode in DO-15 package, with 70 V reverse stand-off voltage (VRWM), 77.8–86.0 V breakdown voltage (VBR), and 113 V clamping voltage (VC) at 4.4 A peak pulse current. It provides robust ESD and surge protection for DC power rails and signal lines in industrial control and telecom interfaces.
For engineers reviewing the SA70CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping symmetry, low leakage (<1 µA at 70 V), fast response (<5 ns), 175 °C junction rating, and DO-15 mechanical compatibility with legacy PCB footprints.
Technical Context
The SA70CA employs a glass-passivated silicon junction optimized for unidirectional and bidirectional transient suppression on 10/1000 µs waveforms. Its bipolar construction ensures identical electrical characteristics in both directions, eliminating polarity concerns during board-level integration.
Designed for high-energy surge events, it delivers 500 W peak pulse power with low incremental surge resistance and clamps transients within 5 ns-critical for protecting sensitive analog inputs and RS-485 transceivers against lightning-induced surges and inductive switching spikes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 500 W - sustains single high-energy surges without failure |
| Reverse Stand-off Voltage (VRWM) | 70 V - maximum continuous DC voltage before conduction begins |
| Breakdown Voltage (VBR) | 77.8–86.0 V @ 1.0 mA - defined threshold where avalanche conduction initiates |
| Clamping Voltage (VC) | 113 V @ 4.4 A - maximum voltage seen by protected circuit during rated surge |
| Peak Pulse Current (IPPM) | 4.4 A - peak current supported at specified clamping voltage |
| Reverse Leakage (IR) | <1 µA @ 70 V - negligible standby power loss and minimal loading on source |
| Junction Temperature Range | −65 to +175 °C - enables operation in harsh industrial and automotive under-hood environments |
Pinout & Package
SA70CA is housed in a standard DO-15 axial-leaded package with no cathode band (bidirectional configuration). Leads are tinned and suitable for wave or hand soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction terminals | No polarity marking; interchangeable connection - protects against positive and negative transients equally |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enhanced moisture resistance and long-term reliability under thermal cycling and humid conditions |
| Fast response time | <5 ns turn-on - limits voltage overshoot before clamping engages |
| Low incremental surge resistance | Enables tighter clamping and lower let-through energy during high-current transients |
| 500 W peak pulse rating | Meets IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 kV line-to-ground) surge immunity requirements |
| DO-15 package compatibility | Direct replacement for legacy TVS diodes in existing through-hole designs without layout change |
Applications
| Industrial PLC I/O Protection | Telecom Line Interface |
|---|---|
Use Scenario: Protecting 24 V DC digital input modules from field-wiring induced surges and ground-loop transients. IC Role / Device Role / Timing Role: Bidirectional clamping device placed across input terminals to shunt surge energy to ground. Use Value: Prevents false triggering and latch-up of optocoupler inputs while maintaining <1 µA leakage at nominal 24 V supply. |
Use Scenario: Safeguarding RS-485 transceiver bus lines in outdoor base stations exposed to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Symmetrical TVS pair (line-to-line and line-to-ground) suppressing differential and common-mode transients. Use Value: Clamps 4.4 A surges to ≤113 V within 5 ns, preserving signal integrity and preventing transceiver damage per IEC 61000-4-5. |
| AC/DC Power Supply Input | Automotive Body Control Module |
Use Scenario: Secondary-side overvoltage protection on 70 V-rated auxiliary DC outputs in industrial SMPS units. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing residual switching spikes and load-dump reflections. Use Value: 70 V VRWM aligns with 24 V system derated to 70 V max, enabling precise clamping without premature conduction. |
Use Scenario: Protecting LIN bus nodes and sensor inputs in body electronics subject to battery load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamp on LIN data line and 12 V supply rail to absorb coupled transients. Use Value: 175 °C operating junction temperature supports under-dash mounting; DO-15 form factor fits constrained PCB space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70CA (onsemi) | Same VRWM (70 V), but SMB package (surface-mount); 600 W rating; slightly higher VC (115 V) | Requires PCB redesign for SMT footprint; better suited for high-volume automated assembly | Select when migrating to surface-mount or requiring higher pulse power margin |
| P6SMB70CA (Littelfuse) | Identical DO-15 package and VRWM; same 500 W rating; VC = 113 V; IR = 1 µA max - functionally aligned | Drop-in mechanical and electrical replacement; validated in same test standards (IEC 61000-4-5) | Preferred for second-source continuity in legacy through-hole designs |
Compared with SMBJ70CA and P6SMB70CA, the SA70CA offers proven DO-15 through-hole reliability for serviceable industrial hardware, while matching key clamping and leakage specs - making it optimal for field-replaceable modules and long-lifecycle deployments where solder-joint inspection and manual rework matter.
Availability
SA70CA is available at Aetrix Electronics and suitable for industrial PLC I/O protection, telecom line interface circuits, and AC/DC power supply input stages requiring stable component supply and long-term obsolescence management.
Supply support for SA70CA 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 of high-performance analog and discrete semiconductors, acquired by ON Semiconductor in 2016; its legacy TVS portfolio remains widely deployed and supported.
The SAxxCA series was engineered specifically for ruggedized bidirectional surge suppression in industrial automation and infrastructure equipment, emphasizing mechanical robustness, thermal stability, and repeatable clamping performance across temperature.
FAQ
What is the clamping voltage of SA70CA at its rated peak pulse current?
The SA70CA has a maximum clamping voltage (VC) of 113 V at 4.4 A peak pulse current (IPPM), measured on the standardized 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-rated surge event, ensuring downstream components remain within safe operating limits. The SA70CA maintains this clamping performance across its full operating temperature range.
Is SA70CA unidirectional or bidirectional, and how does that affect circuit placement?
The SA70CA is a bidirectional TVS diode, indicated by the "CA" suffix and confirmed by identical electrical characteristics in both polarities. It requires no orientation during placement - either lead may connect to line or ground - simplifying assembly and eliminating risk of reverse installation. This symmetry makes SA70CA ideal for protecting AC-coupled signals or differential buses like RS-485 where polarity reversal is possible.
Does SA70CA meet IEC 61000-4-5 surge immunity requirements?
Yes, the SA70CA's 500 W peak pulse power rating on the 10/1000 µs waveform directly supports compliance with IEC 61000-4-5 Level 4 (4 kV line-to-line, 2 kV line-to-ground) when used with appropriate series impedance. Its 113 V clamping voltage and sub-5 ns response ensure protected circuits experience minimal overvoltage stress during standardized surge testing - a key requirement for industrial and telecom equipment certification.
What is the maximum operating temperature for SA70CA?
The SA70CA has a maximum operating junction temperature (TJ) of +175 °C and a storage temperature range of −65 to +175 °C. This high-temperature capability allows reliable deployment in demanding environments such as motor drive cabinets, outdoor telecom enclosures, and under-hood automotive ECUs - provided PCB thermal design maintains junction temperature within spec under steady-state power dissipation and surge conditions.
Can SA70CA be used as a direct replacement for P6SMB70CA?
Yes, SA70CA and P6SMB70CA share identical DO-15 packaging, 70 V VRWM, 500 W peak pulse rating, 113 V clamping voltage, and ≤1 µA leakage - confirming functional and mechanical interchangeability. No PCB or schematic changes are needed. Both meet the same IEC 61000-4-5 surge test profiles, making SA70CA a validated second-source option for continuity in long-life industrial designs.
SA70CA 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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 4.4A
- 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
SA70CA FAQ
1.How can I place an order for SA70CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SA70CA 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 SA70CA reliable?
The price and inventory of SA70CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA70CA is usually 5 days.
3.What payment methods are accepted for SA70CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA70CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA70CA?
SA70CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA70CA 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 SA70CA?
For technical support, including SA70CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA70CA requirements.
6.How does Aetrix verify that SA70CA is sourced from the original manufacturer or authorized distributors?
All SA70CA 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 SA70CA meets industry standards.
7.What is the process for return or replacement of SA70CA?
All SA70CA units undergo pre-shipment inspection (PSI). If there is an issue with SA70CA, 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 SA70CA part is unused and in its original packaging.
Return procedure for SA70CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA70CA Tags
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onsemi
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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