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Taiwan Semiconductor Corporation SA70A
- Part No.:
- SA70A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA70A.pdf
- Description:
- TVS DIODE 70VWM 113VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,979
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Product details
Overview
SA70A from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 70V working stand-off voltage (VWM), 77.8–86.0V breakdown voltage (VBR @ 1mA), and 113V maximum clamping voltage (VC) at 4.6A peak pulse current. It delivers fast response (<1.0ps), low leakage (<1μA @ 70V), and AEC-Q101 qualification for automotive-grade surge protection.
For engineers reviewing the SA70A datasheet, SA70A pinout, SA70A application, or SA70A equivalent, this page provides verified electrical parameters, clamping behavior under 10/1000μs transients, thermal derating curves, polarity marking guidance, and direct alternatives for ESD and inductive load protection in 12V–48V DC systems.
Technical Context
The SA70A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (77.8–86.0V). Its low dynamic impedance ensures stable clamping at 113V under 4.6A 10/1000μs surge, limiting energy dissipation to protect downstream ICs. The device sustains 175°C junction temperature and meets JESD201 Class 2 whisker resistance.
Designed for single-polarity DC rail protection, SA70A features pure tin-plated leads compliant with J-STD-002, UL 94V-0 molding compound, and cathode band polarity marking. It is not rated for bidirectional use - SA70CA or SA70A variants with "CA" suffix are required for bipolar applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before conduction begins; sets safe margin below system nominal voltage (e.g., 48V or 60V rails) |
| VBR @ 1mA | 77.8–86.0 V - Breakdown threshold range; defines precise turn-on point for transient suppression |
| VC @ IPPM | 113 V at 4.6 A - Clamped voltage during 10/1000μs surge; determines maximum stress on protected circuitry |
| PPK | 500 W - Peak pulse power rating per 10/1000μs waveform; quantifies single-event surge handling capability |
| IR @ VWM | <1 μA - Reverse leakage at 70V; ensures minimal standby power loss and signal integrity in high-impedance nodes |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood automotive environments |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with 0.400g mass; compatible with wave soldering and manual rework |
Pinout & Package
SA70A uses a two-terminal DO-204AC (DO-15) package with axial leads. Polarity is marked by a cathode band (colored stripe) on the case; the banded end is the cathode (K), and the unmarked end is the anode (A). Leads are pure tin-plated and solderable per J-STD-002. No internal pin numbering applies - terminals are functionally defined solely by polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward current entry / Reverse voltage reference | Connected to system ground or lower-potential node in unidirectional clamp configuration |
| Cathode (banded end) | Clamping output / Surge sink | Connected to protected line (e.g., 48V supply rail); conducts surge current to ground when VREV > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, HAST, and mechanical shock - supports ASIL-B system integration |
| 500W 10/1000μs surge rating | Withstands IEC 61000-4-5 Level 4 (4kV) surges without degradation when properly mounted on 10×10 mm copper pads |
| <1.0 ps response time | Activates before most microsecond-scale transients fully develop - critical for protecting high-speed CAN/LIN transceivers and MCU I/O |
| RoHS + halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - suitable for export-controlled and green manufacturing programs |
| UL 94V-0 molding | Self-extinguishing epoxy compound prevents flame propagation in overvoltage fault conditions - required for EN 60335 and ISO 26262-compliant enclosures |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
|
Use Scenario: Protecting 48V battery management system (BMS) supply inputs against load dump and alternator switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between 48V rail and chassis ground, clamping spikes above 77.8V within sub-nanosecond. Use Value: Limits peak voltage to 113V during 500W surges, preventing damage to buck converters and monitoring ICs rated for ≤120V absolute maximum. |
Use Scenario: Safeguarding 24V digital input channels of programmable logic controllers (PLCs) against field-wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Standoff protector on each optocoupler input line, absorbing ±8kV contact ESD per IEC 61000-4-2 with <1μA leakage at 24V. Use Value: Maintains signal integrity during normal operation while diverting >4.6A transient current away from sensitive input buffers. |
| LED Driver Overvoltage Clamp | DC Motor Controller Flyback Suppression |
|
Use Scenario: Clamping voltage overshoot on constant-current LED driver outputs during hot-plug or short-circuit recovery events. IC Role / Device Role / Timing Role: Parallel-connected TVS across LED string output, activated only during abnormal overvoltage (>77.8V) to avoid interfering with PWM dimming. Use Value: Prevents catastrophic failure of MOSFET switches and current-sense amplifiers by capping transient voltage at 113V with no latency. |
Use Scenario: Suppressing flyback voltage spikes generated by brushed DC motor commutation in automotive seat/mirror actuators. IC Role / Device Role / Timing Role: Mounted across motor terminals or H-bridge low-side switch, conducting reverse energy into ground during inductive collapse. Use Value: Enables reliable operation at 175°C ambient by sustaining repeated 4.6A pulses without parameter drift or bond wire failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70A (Bourns) | Same VWM (70V), slightly higher VC (115V @ 4.3A); SMB package (surface-mount) vs. DO-15 (through-hole) | Requires PCB redesign for SMT placement; better for high-density layouts but lacks axial lead serviceability | Select SMBJ70A when board space is constrained and automated assembly is used; verify thermal pad layout matches SMB footprint. |
| P6SMB70A (Littelfuse) | Identical VWM (70V), same DO-204AC package, but lower PPK (600W) and higher VC (118V @ 4.3A); RoHS-compliant but not AEC-Q101 qualified | Lacks automotive qualification; suitable for industrial/commercial use only where AEC-Q101 is not mandated | Choose P6SMB70A for cost-sensitive non-automotive designs requiring identical form factor and basic 70V clamping. |
Compared with SMBJ70A and P6SMB70A, SA70A uniquely combines AEC-Q101 qualification, 500W rating in through-hole DO-15, and 113V clamping - making it optimal for automotive body control modules and industrial field I/O where reliability, serviceability, and qualification compliance are jointly required.
Availability
SA70A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC input hardening, LED driver overvoltage clamping, and DC motor controller flyback suppression requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SA70A 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs, with ISO/TS 16949 and AEC-Q200 certified production lines.
The SA Series was developed specifically for robust transient suppression in automotive and industrial environments, emphasizing AEC-Q101 qualification, high-temperature stability, and repeatable clamping performance under real-world surge waveforms.
FAQ
What is the exact breakdown voltage range for SA70A?
The SA70A has a guaranteed breakdown voltage (VBR) range of 77.8 V to 86.0 V at 1 mA test current, measured per ANSI/IEEE C62.35. This range reflects process variation and ensures reliable triggering above the 70 V working stand-off voltage while maintaining margin below system overvoltage limits. Each SA70A unit falls within this spec - no binning is required.
Is SA70A suitable for bidirectional transient protection?
No, SA70A is strictly unidirectional. Its cathode band marking and electrical characteristics apply only in reverse-bias mode. For bidirectional protection, select SA70CA (if available) or SA70A's counterpart with "CA" suffix - which exhibits symmetrical VBR in both directions and is explicitly rated for bipolar applications per TSC documentation.
What is the maximum clamping voltage of SA70A under standard surge conditions?
The SA70A clamps to a maximum of 113 V when subjected to a 10/1000 μs surge waveform with peak current of 4.6 A. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during worst-case transient events - critical for validating compatibility with downstream IC absolute maximum ratings.
Does SA70A require derating at elevated ambient temperatures?
Yes, SA70A must be derated above 25°C ambient per Figure 2 in the datasheet. At 75°C, its peak pulse power drops to ~350W; at 125°C, it falls to ~180W. Derating ensures junction temperature remains ≤175°C. Mounting on 10×10 mm copper pads per JEDEC standards is mandatory to achieve published ratings.
How does SA70A differ from SA70 in terms of electrical performance?
SA70A offers tighter VBR tolerance (77.8–86.0 V) versus SA70 (77.8–95.1 V), lower clamping voltage (113 V vs. 125 V at rated IPPM), and improved temperature coefficient (85 mV/°C vs. 94 mV/°C). These enhancements yield more predictable clamping behavior and reduced voltage overshoot in thermally demanding applications - confirming SA70A as the preferred variant for precision protection.
SA70A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- SA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 4.6A
- 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)
SA70A FAQ
1.How can I place an order for SA70A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA70A 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 SA70A reliable?
The price and inventory of SA70A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA70A is usually 5 days.
3.What payment methods are accepted for SA70A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA70A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA70A?
SA70A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA70A 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 SA70A?
For technical support, including SA70A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA70A requirements.
6.How does Aetrix verify that SA70A is sourced from the original manufacturer or authorized distributors?
All SA70A 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 SA70A meets industry standards.
7.What is the process for return or replacement of SA70A?
All SA70A units undergo pre-shipment inspection (PSI). If there is an issue with SA70A, 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 SA70A part is unused and in its original packaging.
Return procedure for SA70A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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