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Taiwan Semiconductor Corporation SA70CH
- Part No.:
- SA70CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA70CH.pdf
- Description:
- 500W, 86.5V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,200
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Product details
Overview
SA70CH 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 AEC-Q101 qualification for automotive-grade surge protection in power supply rails and interface lines.
For engineers reviewing the SA70CH datasheet, SA70CH pinout, SA70CH application, or SA70CH equivalent, this device is selected for high-reliability DC bus protection where fast clamping (<1.0ps response), low leakage (<1μA @ 70V), and 175°C junction temperature capability are critical in automotive ECU, lighting control, and industrial power modules.
Technical Context
The SA70CH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (77.8–95.1V). Its low dynamic impedance enables rapid energy diversion during 10/1000μs transients, limiting downstream voltage to ≤125V at 4.2A IPPM.
Designed for automotive environments, it meets AEC-Q101 stress requirements including temperature cycling, humidity bias, and mechanical shock. The DO-204AC package supports lead-free soldering per J-STD-002 and passes JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 12/24/48V systems. |
| VBR @ 1mA | 77.8–95.1 V - Breakdown threshold range; ensures reliable turn-on above nominal system voltage with process tolerance. |
| VC @ IPPM | 125 V - Clamped voltage at 4.2A peak pulse; determines maximum transient overvoltage seen by protected ICs. |
| PPK | 500 W - Peak pulse power rating at 10/1000μs waveform; validates robustness against ISO 7637-2 Pulse 1/2/5a surges. |
| IR @ VWM | <1 μA - Reverse leakage at 70V; minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood automotive locations without derating. |
| Package | DO-204AC (DO-15) - Industry-standard axial-leaded package with 0.400g mass; compatible with legacy through-hole assembly and reflow-compatible leads. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy case with cathode band marking. Leads are pure tin-plated, solderable per J-STD-002, and meet UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-side return path; establishes reference for unidirectional clamping action. |
| Cathode | Protected line input | Connected to the line being protected (e.g., battery rail, CAN-H); conducts surge current to ground when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use across temperature, humidity, and mechanical stress tests-enables direct deployment in ECUs and ADAS modules without additional qualification. |
| Clamping voltage ≤125V at 4.2A | Ensures protected ICs (e.g., microcontrollers, gate drivers) experience no more than 125V during worst-case 10/1000μs surge-within typical 135V absolute maximum ratings. |
| Response time <1.0ps | Enables sub-nanosecond turn-on to suppress ESD and fast transients before sensitive circuitry latches or fails. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS directives-supports green manufacturing and export compliance for global OEMs. |
| 175°C junction rating | Permits placement near heat sources (e.g., power MOSFETs, inductors) without thermal derating in engine control units. |
Applications
| Automotive Power Rail Protection | Industrial DC Motor Drive Inputs |
|---|---|
Use Scenario: Protecting 24V battery-fed microcontroller power inputs in body control modules against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VCC and GND to clamp positive-going transients exceeding 70V. Use Value: Limits voltage excursion to ≤125V during ISO 7637-2 Pulse 5a (100V/100ms), preventing MCU brownout or latch-up. |
Use Scenario: Safeguarding H-bridge gate driver ICs from inductive kickback when stopping brushed DC motors in factory automation systems. IC Role / Device Role / Timing Role: Mounted across motor supply terminals to absorb flyback energy during PWM turn-off. Use Value: Absorbs 500W peak surge energy within 1ms, eliminating need for snubber RC networks and reducing BOM count. |
| LED Driver Input Stage | Telecom Power Interface |
Use Scenario: Shielding constant-current LED driver ICs from EFT bursts and lightning-induced surges on 48V input lines in streetlight controllers. IC Role / Device Role / Timing Role: Front-end unidirectional TVS on main DC input, upstream of bulk capacitor and controller. Use Value: Withstands ≥10,000 EFT pulses (IEC 61000-4-4) due to low IR and stable VBR, ensuring long-term reliability in outdoor deployments. |
Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras) from induced surges on 48V PSE lines in building infrastructure. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input rail before DC-DC converter stage. Use Value: 125V clamping voltage aligns with IEEE 802.3bt Class 5/6 surge immunity requirements, enabling single-stage protection architecture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A | Same DO-214AC package; 70V VWM but bidirectional configuration (±70V), higher VC = 115V @ 4.3A. | Requires polarity-insensitive placement; unsuitable where ground-referenced unidirectional clamping is mandatory. | Select SMAJ70A only if bidirectional protection is needed (e.g., data lines); SA70CH provides tighter clamping margin for DC rails. |
| P6SMB70A | DO-214AA package; identical VWM/VBR/VC specs but lower PPK = 600W (vs. SA70CH's 500W), higher IPPM = 4.8A. | Larger footprint and thermal mass; better suited for high-volume industrial PCBs with ample copper area. | Choose P6SMB70A for higher surge margin in non-automotive settings; SA70CH offers AEC-Q101 assurance and smaller DO-15 footprint. |
Compared with SMAJ70A and P6SMB70A, the SA70CH uniquely combines AEC-Q101 qualification, DO-204AC form factor, and 125V clamping at 4.2A-making it the preferred choice for space-constrained, automotive-grade 70V rail protection where certification and thermal reliability are non-negotiable.
Availability
SA70CH is available at Aetrix Electronics and suitable for automotive electronics, industrial motor drives, LED lighting systems, and telecom power interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SA70CH 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, and power devices since 1979.
The SA Series was developed specifically for AEC-Q101-compliant automotive transient suppression, targeting 12V/24V/48V power domains where high clamping accuracy, low leakage, and extreme temperature resilience are essential.
FAQ
What is the clamping voltage of SA70CH at its rated peak pulse current?
The SA70CH has a maximum clamping voltage (VC) of 125 V at 4.2 A peak pulse current (IPPM), measured under the standard 10/1000 μs waveform. This value ensures protected downstream components-such as microcontrollers or gate drivers-remain within their absolute maximum voltage ratings during surge events. The SA70CH datasheet specifies this parameter under TA = 25°C with defined test conditions.
Is SA70CH suitable for automotive applications?
Yes, SA70CH is explicitly AEC-Q101 qualified, as indicated by the "H" suffix in its ordering code. It undergoes rigorous stress testing-including temperature cycling, high-temperature reverse bias, and mechanical shock-to meet automotive reliability standards. Its 175°C maximum junction temperature and DO-204AC package with JESD201 Class 2 whisker resistance make it appropriate for under-hood and ECU applications.
What does the "H" suffix in SA70CH signify?
The "H" suffix in SA70CH denotes AEC-Q101 qualification per Taiwan Semiconductor's ordering nomenclature. It confirms the device has passed all required automotive stress tests and is manufactured under an IATF 16949-certified quality system. This distinguishes SA70CH from non-H variants like SA70A, which lack formal automotive qualification despite similar electrical specs.
How does SA70CH differ from SA70A?
SA70CH and SA70A share identical electrical parameters-including VWM = 70 V, VBR = 77.8–95.1 V, and VC = 125 V-but differ in qualification status. SA70CH carries AEC-Q101 certification and is produced in an automotive-grade flow, while SA70A is intended for commercial/industrial use only. Their DO-204AC packaging and marking conventions are otherwise identical.
What is the reverse leakage current of SA70CH at its working voltage?
The SA70CH exhibits a maximum reverse leakage current (IR) of less than 1 μA at its 70 V working stand-off voltage (VWM), tested at TA = 25°C. This ultra-low leakage minimizes power loss in always-on automotive circuits and prevents false triggering in high-impedance sensing nodes-critical for battery-sensitive applications such as telematics and ADAS modules.
SA70CH 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:
- 125V
- Current - Peak Pulse (10/1000µs):
- 4.2A
- 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)
SA70CH FAQ
1.How can I place an order for SA70CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA70CH 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 SA70CH reliable?
The price and inventory of SA70CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA70CH is usually 5 days.
3.What payment methods are accepted for SA70CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA70CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA70CH?
SA70CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA70CH 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 SA70CH?
For technical support, including SA70CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA70CH requirements.
6.How does Aetrix verify that SA70CH is sourced from the original manufacturer or authorized distributors?
All SA70CH 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 SA70CH meets industry standards.
7.What is the process for return or replacement of SA70CH?
All SA70CH units undergo pre-shipment inspection (PSI). If there is an issue with SA70CH, 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 SA70CH part is unused and in its original packaging.
Return procedure for SA70CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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