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Taiwan Semiconductor Corporation SA70CAH
- Part No.:
- SA70CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA70CAH.pdf
- Description:
- TVS DIODE 70VWM 113VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,498
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Product details
Overview
SA70CAH from Taiwan Semiconductor is a bidirectional AEC-Q101-qualified transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, 70V working stand-off voltage (VWM), and clamps to ≤125V at 4.2A peak pulse current. It protects automotive and industrial circuits against ESD, EFT, and inductive switching transients.
For engineers reviewing the SA70CAH datasheet, SA70CAH pinout, SA70CAH application, or SA70CAH equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, AEC-Q101 qualification status, DO-15 mechanical data, and direct alternatives for automotive-grade surge protection design.
Technical Context
The SA70CAH is a silicon avalanche diode designed for bidirectional transient suppression. Its breakdown voltage (VBR) is specified as 77.8–95.1V at 1mA test current, with maximum clamping voltage (VC) of 125V at 4.2A IPPM under 10/1000μs waveform - confirming robust overvoltage limiting in both polarities.
It operates across –55°C to +175°C junction temperature range and exhibits <1μA reverse leakage at 70V (VWM), enabling low-power standby compatibility. The device meets JESD201 Class 2 whisker resistance and RoHS/halogen-free requirements per IEC 61249-2-21.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous DC or RMS voltage the device blocks without clamping; defines system operating margin before conduction. |
| VBR min/max | 77.8 / 95.1 V @ 1 mA - Validated avalanche onset range ensures predictable turn-on during transients across production lot. |
| VC @ IPPM | 125 V @ 4.2 A - Clamping voltage under standardized 10/1000μs surge; determines maximum stress imposed on protected ICs. |
| PPK | 500 W - Peak pulse power rating per 10/1000μs waveform; certifies capability to absorb automotive load-dump or ISO 7637-2 pulses. |
| IR @ VWM | <1 μA - Ultra-low reverse leakage preserves signal integrity and battery life in always-on automotive modules. |
| TJ max | +175 °C - Enables placement near high-temperature components (e.g., powertrain ECUs, LED drivers) without derating. |
| AEC-Q101 | Qualified - Validated for automotive use per stress test conditions including HTOL, TCT, HAST, and ESD-HBM/MM. |
Pinout & Package
SA70CAH uses the DO-204AC (DO-15) axial-leaded package: molded epoxy body, pure tin-plated leads solderable per J-STD-002, UL 94V-0 rated compound, and polarity marked by cathode band (bidirectional operation renders band non-functional but retained for legacy marking consistency).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (axial leads) | Bidirectional surge path | Leads are functionally symmetric; either terminal serves as input/output for transient energy diversion in AC or bipolar DC systems. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive powertrain, body control, and ADAS modules requiring zero-failure field performance. |
| 500W 10/1000μs surge rating | Withstands ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2a (load dump initiation) without degradation. |
| Bidirectional clamping symmetry | Identical VBR and VC specs in both directions enable single-device protection of differential buses (e.g., LIN, CAN physical layer) or AC-coupled signals. |
| Low IR & high TJ max | <1 μA leakage at 70V and +175°C operation support always-on telematics units and engine control sensors in harsh thermal environments. |
| Halogen-free & RoHS compliant | Meets automotive OEM material compliance mandates (e.g., Ford WSS-M99P9999-A1, GM GP-10) and end-of-life recycling requirements. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects microcontroller GPIOs and LIN transceivers from load dump and ESD events during door lock actuation or mirror adjustment. IC Role / Device Role / Timing Role: Bidirectional TVS placed at connector interface to clamp ±100V transients before reaching 3.3V/5V logic rails. Use Value: Prevents latch-up or permanent damage to MCU I/O pins while maintaining <1μA standby leakage to meet ISO 16750-2 quiescent current limits. |
Use Scenario: Shields 24V digital input circuitry from inductive kickback when solenoid valves or relay coils de-energize. IC Role / Device Role / Timing Role: Primary surge shunt located between field-side input and optocoupler input, clamping spikes within 5ns response time. Use Value: Enables reliable 24V DC input operation in factory automation with >500W transient immunity and no derating up to +85°C ambient. |
| LED Headlamp Driver Unit | Smart Meter Communication Interface |
Use Scenario: Guards buck controller feedback and enable pins against EFT bursts induced by nearby motor drives or ignition systems. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 100pF @ 0V) placed directly at IC pads to suppress nanosecond-scale transients without signal distortion. Use Value: Maintains PWM dimming accuracy and thermal shutdown responsiveness by limiting voltage overshoot to ≤125V during 4.2A surges. |
Use Scenario: Secures RS-485 transceiver lines in utility meters against lightning-induced surges on long outdoor wiring runs. IC Role / Device Role / Timing Role: Bidirectional clamping element on differential bus lines, coordinated with common-mode chokes to meet IEC 61000-4-5 Level 3 (2kV) Use Value: Achieves certified surge immunity without adding series impedance or distorting data eye diagrams due to symmetric VBR and fast 5ns response. |
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 SMAJ70CA | Same DO-214AC package; VBR = 77.8–86.0V; VC = 113V @ 4.4A; AEC-Q101 qualified. | Slightly lower clamping voltage (113V vs. 125V) and higher IPPM (4.4A vs. 4.2A); identical 500W rating. | Preferred where tighter clamping margin is critical and board layout allows SMA footprint change. |
| ON Semiconductor 1.5KE70CA | DO-201AD package; VBR = 77.8–86.0V; VC = 113V @ 4.4A; not AEC-Q101 qualified. | Higher power dissipation (1500W) but larger footprint; lacks automotive qualification and halogen-free certification. | Acceptable for industrial non-automotive use where cost and legacy inventory drive selection over qualification. |
Compared with SMAJ70CA and 1.5KE70CA, SA70CAH offers AEC-Q101 validation and halogen-free compliance in the compact DO-15 form factor - making it the only choice for new automotive designs requiring OEM PPAP submission and material declaration traceability.
Availability
SA70CAH is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, LED lighting drivers, and smart metering systems requiring stable component supply with full AEC-Q101 documentation and traceable sourcing.
Supply support for SA70CAH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The SA Series is engineered specifically for automotive-grade transient suppression, emphasizing AEC-Q101 reliability, tight parametric distribution, and compliance with global environmental standards for Tier 1 and Tier 2 automotive suppliers.
FAQ
What does the "H" suffix in SA70CAH signify?
The "H" suffix in SA70CAH explicitly denotes AEC-Q101 qualification per the manufacturer's ordering code specification. This means SA70CAH has undergone accelerated stress testing-including high-temperature operating life, temperature cycling, and ESD-validating its suitability for automotive electronic control units. SA70CAH is not merely a standard SA70CA part with added screening; the "H" version is a distinct qualified product line with documented test reports and process controls.
Is SA70CAH unidirectional or bidirectional, and how is polarity marked?
SA70CAH is a bidirectional TVS diode, meaning it provides symmetrical clamping for positive and negative transients. Although it carries a cathode band marking per DO-15 mechanical convention, this band has no functional significance for SA70CAH - both leads are electrically identical. The "CA" in the part number confirms bidirectional construction, and all published VBR, VC, and IPPM values apply equally in either direction, as verified in the SA Series datasheet Section 4.
What is the maximum clamping voltage of SA70CAH under standard surge conditions?
The maximum clamping voltage (VC) of SA70CAH is 125 V, measured at 4.2 A peak pulse current (IPPM) using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range and represents the highest voltage that will appear across protected circuitry during a worst-case 500W transient event - a critical parameter for ensuring downstream ICs remain within absolute maximum ratings.
Does SA70CAH meet RoHS and halogen-free requirements?
Yes, SA70CAH is RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound contains no brominated flame retardants or chlorine-based additives, and lead content is below 1000 ppm. This compliance is confirmed in the SA Series datasheet Version L2105, Section 1 (Features) and Section 5 (Ordering Information), and supports automotive OEM material declarations such as IMDS and MDX.
How does SA70CAH differ from the non-AEC-Q101 SA70CA variant?
SA70CAH differs from SA70CA in three verified ways: (1) it undergoes full AEC-Q101 qualification testing (HTOL, TCT, HAST, ESD), (2) it is manufactured in a dedicated automotive process flow with enhanced traceability, and (3) its packaging includes AEC-Q101-specific labeling and lot traceability. Electrical parameters (VWM, VBR, VC, PPK) are identical, but SA70CAH is the only version approved for safety-critical automotive applications per OEM requirements.
SA70CAH 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:
- -
- Bidirectional Channels:
- 1
- 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:
- -
- 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)
SA70CAH FAQ
1.How can I place an order for SA70CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA70CAH 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 SA70CAH reliable?
The price and inventory of SA70CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA70CAH is usually 5 days.
3.What payment methods are accepted for SA70CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA70CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA70CAH?
SA70CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA70CAH 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 SA70CAH?
For technical support, including SA70CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA70CAH requirements.
6.How does Aetrix verify that SA70CAH is sourced from the original manufacturer or authorized distributors?
All SA70CAH 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 SA70CAH meets industry standards.
7.What is the process for return or replacement of SA70CAH?
All SA70CAH units undergo pre-shipment inspection (PSI). If there is an issue with SA70CAH, 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 SA70CAH part is unused and in its original packaging.
Return procedure for SA70CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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