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Taiwan Semiconductor Corporation SA7.0
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- Part No.:
- SA7.0
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA7.0.pdf
- Description:
- 500W, 8.6V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,522
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Product details
Overview
SA7.0 from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, designed for primary overvoltage protection of DC power rails and signal lines. It features 7.78–9.51 V breakdown voltage (VBR), 7.0 V working stand-off voltage (VWM), 150 A peak pulse current (IPPM), 39.0 V clamping voltage (VC) at IPPM, and 500 W surge rating at 10/1000 µs waveform - deployed in automotive lighting control modules and industrial sensor interfaces.
For engineers reviewing the SA7.0 datasheet, SA7.0 pinout, SA7.0 application, or SA7.0 equivalent, this page delivers verified electrical parameters, DO-204AC terminal polarity mapping, real-world clamping performance under 10/1000 µs transients, thermal derating behavior up to 175 °C junction temperature, and validated alternatives for ESD and load-dump protection in 12 V automotive subsystems.
Technical Context
The SA7.0 operates as a silicon avalanche diode with unidirectional polarity, triggered when reverse voltage exceeds its specified VBR range (7.78–9.51 V at 10 mA). Its low dynamic impedance enables rapid clamping response (<1.0 ps rise time from 0 V to VBR) and limits transient energy dissipation across protected ICs.
It complies with IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT) immunity requirements when applied with proper PCB layout. The device sustains 70 A non-repetitive forward surge current (IFSM) and maintains <1 µA leakage above 10 V, ensuring minimal standby power loss in always-on circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for safe DC rail operation. |
| VBR @ 10 mA | 7.78–9.51 V - Breakdown voltage range defining turn-on threshold; ensures reliable triggering during 12 V system transients. |
| VC @ 150 A | 39.0 V - Clamped voltage at full rated surge; determines maximum stress imposed on downstream circuitry. |
| IPPM | 150 A - Peak pulse current capability at 10/1000 µs waveform; defines single-event surge handling capacity. |
| PPK | 500 W - Peak pulse power rating; validates suitability for ISO 7637-2 Load Dump Pulse 5a (12 V systems). |
| TJMAX | 175 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| Leakage @ VWM | <1 µA - Reverse leakage at 7.0 V; guarantees negligible quiescent current draw in battery-powered nodes. |
Pinout & Package
Package: DO-204AC (DO-15), axial-leaded, epoxy-molded case with UL 94V-0 flammability rating. Cathode indicated by band marking; anode and cathode terminals are electrically isolated except during avalanche conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Low-side reference node | Connected to ground or return path; forms current sink during transient clamping. |
| Cathode (banded end) | High-side transient input | Connected to protected line (e.g., 12 V supply); conducts avalanche current to ground when VIN > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Avalanche clamping speed | <1.0 ps response from 0 V to VBR - minimizes voltage overshoot before protection engages. |
| Surge robustness | 500 W peak power at 10/1000 µs - meets ISO 7637-2 Pulse 5a for 12 V automotive load dump. |
| Thermal stability | 175 °C max junction temperature - enables placement near heat-generating components without derating. |
| Leakage control | <1 µA at 7.0 V - preserves battery life in always-on vehicle modules (e.g., CAN wake-up receivers). |
| Material compliance | RoHS-compliant and halogen-free per IEC 61249-2-21 - satisfies automotive Tier-1 environmental requirements. |
Applications
| Automotive Lighting Control | Industrial Sensor Interface |
|---|---|
|
Use Scenario: Protecting LED driver ICs and microcontrollers from load-dump transients in headlamp and tail lamp modules. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V supply rail upstream of DC-DC converter input. Use Value: Limits clamped voltage to 39.0 V, preventing damage to 40 V-rated input stages while sustaining 150 A surge events. |
Use Scenario: Shielding analog front-end amplifiers and ADC inputs in factory-floor pressure/temperature sensors. IC Role / Device Role / Timing Role: Fast-response shunt protector on 5–24 V signal/power lines exposed to relay switching noise. Use Value: Sub-1 ps turn-on ensures clamping occurs before sensitive op-amps exceed absolute maximum ratings during EFT bursts. |
| USB-C Power Delivery Port | Smart Meter Communication Module |
|
Use Scenario: Safeguarding USB PD controller VBUS monitoring circuitry against hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Standoff-rated TVS on VBUS line between connector and buck converter input. Use Value: 7.0 V VWM allows clean operation across 5–20 V PD profiles while clamping to 39.0 V during 10/1000 µs surges. |
Use Scenario: Securing RS-485 transceivers and microcontroller GPIOs in utility smart meters subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-level protection on isolated data lines after primary gas discharge tube (GDT) stage. Use Value: Low 1 µA leakage avoids loading bias networks; DO-15 package enables manual rework on high-reliability meter PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ7.0A | Same DO-214AC package; 7.0 V VWM, 39.4 V VC @ 150 A, but 600 W PPK rating. | Higher surge margin suits harsher load-dump profiles (e.g., 24 V commercial vehicles); slightly larger footprint. | Select SMAJ7.0A if higher peak power headroom is required and board space permits SMA package. |
| ON Semiconductor 1.5KE7.0A | DO-201AD package; 7.0 V VWM, 40.0 V VC @ 150 A, 1500 W PPK; higher IFSM (200 A). | Designed for higher-energy transients (e.g., ISO 16750-2 Pulse 5b); not AEC-Q101 qualified. | Choose 1.5KE7.0A only for non-automotive industrial use where AEC-Q101 compliance is not mandated. |
Compared with SMAJ7.0A and 1.5KE7.0A, the SA7.0 offers AEC-Q101 qualification in the smaller DO-15 package, lower leakage (<1 µA vs. 5 µA), and optimized thermal resistance for compact automotive PCB layouts - making it preferred for cost-sensitive, space-constrained 12 V ECUs.
Availability
SA7.0 is available at Aetrix Electronics and suitable for automotive lighting control, industrial sensor interface, and USB-C power delivery port protection requiring stable component supply and AEC-Q101-compliant surge resilience.
Supply support for SA7.0 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 for automotive and industrial markets.
The SA Series was developed specifically for AEC-Q101-compliant transient suppression in 12–48 V automotive subsystems, emphasizing low clamping voltage, fast response, and high-temperature reliability.
FAQ
What is the polarity configuration of the SA7.0?
The SA7.0 is a unidirectional TVS diode with cathode marked by a band on the DO-204AC (DO-15) package. It conducts only in reverse bias above VBR, making it suitable for DC rail protection where polarity is fixed. This differs from bidirectional variants like SA7.0CA, which protect AC or dual-polarity signals.
Does the SA7.0 meet AEC-Q101 qualification?
Yes, the SA7.0 is AEC-Q101 qualified when ordered with the "H" suffix (e.g., SA7.0H). Standard SA7.0 parts are not automatically qualified; AEC-Q101 compliance requires explicit ordering code confirmation and is verified per test condition TSC L2105 specification revision.
What is the maximum clamping voltage of the SA7.0 at rated surge current?
The SA7.0 clamps to a maximum of 39.0 V at 150 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and defines the worst-case voltage seen by downstream components during surge events.
Can the SA7.0 be used in bidirectional signal line protection?
No, the SA7.0 is unidirectional and unsuitable for bidirectional signal lines such as RS-485 or CAN without external polarity management. For such applications, use the bidirectional SA7.0CA variant, which provides symmetrical clamping in both directions and shares the same VBR and VC specs.
How does the SA7.0 perform under elevated ambient temperatures?
The SA7.0 maintains full 500 W surge capability at 25 °C, with linear derating above that point per Fig.2 in TSC L2105. At 100 °C ambient, its peak pulse power drops to ~350 W, and at 150 °C, it retains ~200 W - enabling use in engine bay locations with appropriate thermal design.
SA7.0 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:
- 13.3V
- Current - Peak Pulse (10/1000µs):
- 39A
- 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)
SA7.0 FAQ
1.How can I place an order for SA7.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA7.0 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 SA7.0 reliable?
The price and inventory of SA7.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA7.0 is usually 5 days.
3.What payment methods are accepted for SA7.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA7.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA7.0?
SA7.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA7.0 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 SA7.0?
For technical support, including SA7.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA7.0 requirements.
6.How does Aetrix verify that SA7.0 is sourced from the original manufacturer or authorized distributors?
All SA7.0 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 SA7.0 meets industry standards.
7.What is the process for return or replacement of SA7.0?
All SA7.0 units undergo pre-shipment inspection (PSI). If there is an issue with SA7.0, 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 SA7.0 part is unused and in its original packaging.
Return procedure for SA7.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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