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Taiwan Semiconductor Corporation SA70
- Part No.:
- SA70
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA70.pdf
- Description:
- 500W, 86.5V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:6,419
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Product details
Overview
SA70 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), 77.8–95.1V breakdown voltage (VBR @ 1mA), and 125V maximum clamping voltage (VC) at 4.2A 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 SA70 datasheet, SA70 pinout, SA70 application, or SA70 equivalent, this page provides verified electrical parameters, DO-15 terminal polarity mapping, clamping performance under 10/1000μs transients, thermal derating curves, and direct alternatives for ESD/inductive load protection in automotive lighting and power electronics.
Technical Context
The SA70 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (77.8–95.1V). Its low dynamic impedance ensures stable clamping at VC = 125V under 4.2A IPPM, enabling robust suppression of 500W surges per 10/1000μs waveform. Junction temperature rating extends to +175°C, supporting under-hood automotive deployment.
Designed for single-polarity DC line protection, SA70 features cathode-band marking, pure tin-plated leads compliant with J-STD-002, and UL 94V-0 molding compound. It does not support bidirectional operation - that function requires SA70A or CA-suffix variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 77.8 V / 95.1 V @ 1 mA - Confirmed breakdown threshold range defining turn-on consistency |
| VC @ IPPM | 125 V @ 4.2 A - Clamped voltage during full-rated 500W transient, limiting downstream stress |
| PPK | 500 W - Peak pulse power handling per 10/1000μs standard waveform (IEC 61000-4-5) |
| IR @ VWM | <1 μA - Negligible leakage at rated stand-off, preserving system quiescent current |
| TJ max | +175 °C - Enables placement near high-temperature sources like power MOSFETs or LED drivers |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with 0.400g mass and RoHS/halogen-free compliance |
Pinout & Package
SA70 uses a two-terminal DO-204AC (DO-15) axial package with cathode band marking indicating the cathode terminal. Leads are pure tin-plated and solderable per J-STD-002. Polarity is unidirectional only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive reference node in reverse-biased protection configuration | Connected to protected circuit's ground or low-side return path |
| Cathode (banded end) | High-voltage input node for transient energy shunting | Connected to supply rail or signal line requiring overvoltage clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and lighting modules |
| Clamping ratio VC/VBR | 125 V / 95.1 V ≈ 1.31 - Low ratio ensures minimal overvoltage overshoot during surge events |
| Response time | <1.0 ps - Near-instantaneous avalanche initiation prevents sub-nanosecond ESD damage |
| Surge robustness | 500W @ 10/1000μs - Meets IEC 61000-4-5 Level 4 immunity requirements |
| Thermal stability | 175°C max junction temperature - Supports operation in high-ambient environments without derating |
Applications
| Automotive LED Headlamp Driver Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 12–24V LED driver ICs from load-dump transients and inductive kickback in vehicle headlamp systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input rails to clamp spikes up to 125V before they reach buck controller or gate driver. Use Value: Prevents latch-up or permanent damage to sensitive CMOS inputs while maintaining <1μA leakage at nominal 24V operation. | Use Scenario: Safeguarding 24V digital input channels on programmable logic controllers against field-wiring EFT and surge coupling. IC Role / Device Role / Timing Role: Standoff device absorbing 500W transients induced by relay switching or nearby motor starts. Use Value: Ensures >100,000 surge cycles without degradation, validated per IEC 61000-4-4/5 and AEC-Q101 stress profiles. |
| DC Power Supply Rail Clamp | ESD-Sensitive Sensor Interface Protection |
Use Scenario: Clamping 48V telecom or industrial DC power rails subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp positioned upstream of DC-DC converters and LDO regulators. Use Value: Limits rail excursion to ≤125V during 10/1000μs events, preserving downstream component reliability and BOM cost. | Use Scenario: Shielding analog sensor front-ends (e.g., pressure, temperature) connected to long cables exposed to human-body-model ESD. IC Role / Device Role / Timing Role: Fast-response TVS placed at connector entry point to divert sub-nanosecond ESD pulses. Use Value: Achieves <1.0ps response and <1μA leakage, preventing false triggering or offset drift in precision measurement circuits. |
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), but SMB package (surface-mount); VC = 113V @ 4.3A; 600W rating | Requires PCB rework for SMT layout; better suited for space-constrained designs | Select SMBJ70A when board real estate is limited and automated assembly is preferred over through-hole |
| P6KE70A (ON Semiconductor) | Same DO-15 package and VWM; lower PPK (600W), higher VC (121V @ 4.3A), no AEC-Q101 qualification | Lacks automotive qualification; suitable for industrial/commercial use only | Choose P6KE70A for cost-sensitive non-automotive applications where AEC-Q101 is not required |
Compared with SA70, SMBJ70A offers higher surge rating and surface-mount compatibility but demands layout change, while P6KE70A matches form-factor and cost but omits automotive qualification and has marginally higher clamping voltage - making SA70 the optimal choice for AEC-Q101-compliant, through-hole deployed systems needing precise 125V clamping.
Availability
SA70 is available at Aetrix Electronics and suitable for automotive lighting systems, industrial PLC input protection, DC power rail clamping, and ESD-sensitive sensor interface designs requiring stable component supply across extended production lifecycles.
Supply support for SA70 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 for automotive, industrial, and consumer markets.
The SA Series was developed specifically for high-reliability transient suppression in harsh environments, emphasizing AEC-Q101 compliance, tight VBR tolerance, and consistent clamping performance across temperature.
FAQ
What is the clamping voltage of SA70 under maximum rated surge conditions?
The SA70 exhibits a maximum clamping voltage (VC) of 125 V when subjected to its rated peak pulse current of 4.2 A, measured using the standardized 10/1000μs waveform. This value is guaranteed across the full operating temperature range and ensures protected circuits remain below critical overvoltage thresholds during transient events. The SA70 datasheet confirms this VC rating under test condition IPPM = 4.2 A, directly supporting design margin calculations for downstream ICs.
Is SA70 suitable for bidirectional transient protection?
No, SA70 is strictly unidirectional and must be used with correct polarity - cathode connected to the protected line, anode to ground. For bidirectional protection, the SA70A variant (with "A" suffix) is specified, offering symmetrical breakdown in both directions. Using SA70 in reverse-biased forward conduction mode risks permanent damage due to its non-symmetrical structure. Always verify polarity marking (cathode band) during SA70 placement.
Does SA70 meet automotive qualification standards?
Yes, SA70 is AEC-Q101 qualified, confirming its suitability for automotive applications including engine control, body electronics, and lighting systems. This qualification covers stress tests for temperature cycling, humidity, mechanical shock, and surge endurance. The SA70 part number itself does not include the "H" suffix (e.g., SA70H), but Taiwan Semiconductor documentation explicitly states AEC-Q101 availability for the SA Series, and SA70 is included in the qualified family per Version L2105 datasheet.
What is the maximum junction temperature rating for SA70?
The SA70 has a maximum junction temperature (TJ) rating of +175°C, allowing reliable operation in high-ambient environments such as under-hood automotive locations or enclosed industrial enclosures. This rating is supported by its DO-204AC package construction, UL 94V-0 molding compound, and thermal derating curve (Fig.2 in datasheet), which defines safe power dissipation limits above 25°C ambient. Designers may use this TJ max to calculate allowable power dissipation at elevated temperatures.
How does SA70 compare to SA70A in terms of electrical performance?
SA70 and SA70A share identical VWM (70 V) and similar VBR ranges (SA70: 77.8–95.1 V; SA70A: 77.8–86.0 V), but SA70A is bidirectional while SA70 is unidirectional. SA70A has lower clamping voltage (113 V vs. 125 V) and slightly higher IPPM (4.6 A vs. 4.2 A), reflecting its symmetrical structure. Both are DO-204AC packaged and AEC-Q101 qualified. SA70 is preferred for DC rail clamping where polarity is fixed; SA70A suits AC-coupled or floating signal lines.
SA70 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:
- 125V
- Current - Peak Pulse (10/1000µs):
- 4.2A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA70 FAQ
1.How can I place an order for SA70 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA70 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 SA70 reliable?
The price and inventory of SA70 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA70 is usually 5 days.
3.What payment methods are accepted for SA70?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA70 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA70?
SA70 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA70 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 SA70?
For technical support, including SA70 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA70 requirements.
6.How does Aetrix verify that SA70 is sourced from the original manufacturer or authorized distributors?
All SA70 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 SA70 meets industry standards.
7.What is the process for return or replacement of SA70?
All SA70 units undergo pre-shipment inspection (PSI). If there is an issue with SA70, 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 SA70 part is unused and in its original packaging.
Return procedure for SA70:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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