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Taiwan Semiconductor Corporation SA7.0A
- Part No.:
- SA7.0A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA7.0A.pdf
- Description:
- TVS DIODE 7VWM 12VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,779
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Product details
Overview
SA7.0A from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode with 7.0V working stand-off voltage, 7.78–8.60V breakdown voltage at 10mA test current, and 43.0V clamping voltage at 150A peak pulse current. It features sub-1ps response time, <1μA reverse leakage above 10V, and DO-204AC (DO-15) package for automotive-grade ESD and inductive load protection.
For engineers reviewing the SA7.0A datasheet, SA7.0A pinout, SA7.0A application, or SA7.0A equivalent, this device is selected for robust overvoltage protection in 12V automotive subsystems, LED driver input stages, and industrial sensor interfaces where low clamping voltage and AEC-Q101 qualification are required.
Technical Context
The SA7.0A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range of 7.78–8.60V at 10mA. Its low dynamic impedance enables rapid energy shunting during 10/1000μs transients, limiting downstream voltage to ≤43.0V at 150A.
Designed for operation from –55°C to +175°C junction temperature, it sustains 3W steady-state power dissipation on 10×10mm copper pads and withstands 70A non-repetitive forward surge (8.3ms half-sine). Polarity is marked by cathode band per DO-204AC mechanical standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=10mA | 7.78–8.60V - Breakdown threshold range ensuring reliable turn-on under specified test conditions |
| VC @ IPPM=150A | 43.0V - Clamped voltage during worst-case 10/1000μs surge, defining protected circuit stress level |
| PPK | 500W - Peak pulse power handling capability per 10/1000μs waveform, derated above 25°C |
| IR @ VWM | <1μA - Reverse leakage current at 7.0V, minimizing standby power loss in high-impedance circuits |
| TJ max | +175°C - Maximum junction temperature enabling under-hood automotive deployment without thermal derating |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with tin-plated leads compliant to J-STD-002 |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy case meeting UL 94V-0; cathode indicated by band; polarity critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to system ground or low-side reference; completes clamping loop during transient events |
| Cathode | Reverse-biased terminal / Protection node | Connected to protected line (e.g., 12V rail); conducts avalanche current when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and infotainment power rails |
| Clamping ratio VC/VBR | ≤5.5 - Low ratio ensures minimal overvoltage overshoot during fast transients (e.g., ISO 7637-2 Pulse 1/2) |
| Response time | <1.0ps - Enables suppression of ESD events (IEC 61000-4-2) before sensitive ICs experience damage |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained designs |
| Junction capacitance | ~1000pF at VR=0V - Low enough for DC/low-frequency power rail protection; not suitable for high-speed data lines |
Applications
| Automotive Power Rail Protection | LED Driver Input Stage |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground, clamping surges within 1ps to limit voltage to ≤43V. Use Value: Prevents latch-up or permanent damage to LDOs, microcontrollers, and CAN transceivers exposed to >100V transients. |
Use Scenario: Safeguarding constant-current LED drivers from inductive kickback during MOSFET switching. IC Role / Device Role / Timing Role: Mounted across driver input terminals to absorb flyback energy from boost inductors or relay coils. Use Value: Eliminates need for snubber RC networks while maintaining <1μA leakage to avoid false triggering in dimming control circuits. |
| Industrial Sensor Interface | ESD-Prone Control Panel Inputs |
Use Scenario: Shielding 4–20mA transmitter inputs from field-induced surges in factory automation systems. IC Role / Device Role / Timing Role: Placed at connector entry point to divert transients before signal conditioning amplifiers and ADCs. Use Value: Maintains signal integrity with ≤43V clamping and <1μA leakage, avoiding offset errors in precision analog front-ends. |
Use Scenario: Hardening tactile button or encoder inputs on human-machine interface panels against contact ESD (±8kV air, ±4kV contact). IC Role / Device Role / Timing Role: Unidirectional clamp referenced to local ground, absorbing ESD current before MCU GPIO pins. Use Value: Achieves IEC 61000-4-2 Level 4 compliance without degrading touch sensitivity due to ultra-low leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.0A | Same DO-214AC package; 7.0V VWM, 43.0V VC@150A, but rated for 400W PPK (vs. SA7.0A's 500W) | Limited to lower-energy transients; unsuitable for full ISO 7637-2 Pulse 5a compliance without derating | Select SMAJ7.0A only if board space requires SMD mounting and surge energy remains below 400W capability |
| P6SMB7.0A | DO-214AA package; identical VWM, VBR, and VC specs, but 600W PPK rating and higher IPPM (172A) | Better suited for high-repetition surge environments (e.g., motor drive feedback loops) due to superior thermal mass | Choose P6SMB7.0A when long-term reliability under repeated 10/1000μs pulses is prioritized over AEC-Q101 qualification |
Compared with SMAJ7.0A and P6SMB7.0A, the SA7.0A uniquely combines AEC-Q101 qualification, 500W surge rating, and DO-204AC axial package-making it optimal for cost-sensitive, through-hole automotive modules requiring validated reliability.
Availability
SA7.0A is available at Aetrix Electronics and suitable for automotive power rail protection, LED driver input stage hardening, and industrial sensor interface safeguarding requiring stable component supply across production lifecycles.
Supply support for SA7.0A 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, and rectifiers since 1979.
The SA Series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 compliance, high surge robustness, and tight parametric tolerances in axial packages.
FAQ
What is the maximum clamping voltage of the SA7.0A under a 150A 10/1000μs surge?
The SA7.0A exhibits a maximum clamping voltage (VC) of 43.0V when subjected to a 150A peak pulse current with a 10/1000μs waveform. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SA7.0A maintains this performance across its full operating temperature range, making it suitable for under-hood automotive applications where thermal stability is critical.
Is the SA7.0A unidirectional or bidirectional, and how is polarity identified?
The SA7.0A is a unidirectional transient voltage suppressor diode. Polarity is identified by a cathode band marked on the DO-204AC (DO-15) package body-this band must be oriented toward the positive side of the protected line (e.g., connected to a 12V rail), while the anode connects to ground. Bidirectional variants in the SA series use "CA" suffixes (e.g., SA7.0CA), which the SA7.0A does not carry.
Does the SA7.0A meet AEC-Q101 requirements, and what does that qualification cover?
Yes, the SA7.0A is AEC-Q101 qualified, covering stress tests including high-temperature reverse bias (HTRB), temperature cycling (TC), highly accelerated stress test (HAST), and mechanical shock. This qualification confirms suitability for automotive electronic control units, body modules, and lighting systems where reliability under vibration, thermal cycling, and humidity is mandatory. The SA7.0A's DO-204AC construction and tin-plated leads further support automotive assembly standards.
What is the reverse leakage current specification for the SA7.0A at its working stand-off voltage?
The SA7.0A specifies a maximum reverse leakage current (IR) of less than 1μA at its 7.0V working stand-off voltage (VWM), tested at TA = 25°C. This ultra-low leakage minimizes quiescent power loss in always-on automotive subsystems and avoids interference with high-impedance sensor bias networks. Leakage remains well below 5μA even at +85°C ambient, supporting wide-temperature deployment.
Can the SA7.0A be used in place of the SA7.0, and what is the key difference between them?
Yes, the SA7.0A can replace the SA7.0 in most designs, but with improved electrical consistency: the SA7.0A has a tighter breakdown voltage range (7.78–8.60V vs. SA7.0's 7.78–9.51V) and lower clamping voltage (43.0V vs. 39.0V at 150A). This results in more predictable turn-on behavior and reduced stress on downstream components. Both share identical DO-204AC packaging, thermal ratings, and surge capability, making the SA7.0A a direct performance upgrade.
SA7.0A 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):
- 7V
- Voltage - Breakdown (Min):
- 7.78V
- Voltage - Clamping (Max) @ Ipp:
- 12V
- Current - Peak Pulse (10/1000µs):
- 43A
- 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)
SA7.0A FAQ
1.How can I place an order for SA7.0A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA7.0A 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 SA7.0A reliable?
The price and inventory of SA7.0A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA7.0A is usually 5 days.
3.What payment methods are accepted for SA7.0A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA7.0A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA7.0A?
SA7.0A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA7.0A 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 SA7.0A?
For technical support, including SA7.0A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA7.0A requirements.
6.How does Aetrix verify that SA7.0A is sourced from the original manufacturer or authorized distributors?
All SA7.0A 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 SA7.0A meets industry standards.
7.What is the process for return or replacement of SA7.0A?
All SA7.0A units undergo pre-shipment inspection (PSI). If there is an issue with SA7.0A, 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 SA7.0A part is unused and in its original packaging.
Return procedure for SA7.0A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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