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Taiwan Semiconductor Corporation SA70H
- Part No.:
- SA70H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA70H.pdf
- Description:
- 500W, 86.5V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:5,372
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Product details
Overview
SA70H 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 SA70H datasheet, SA70H pinout, SA70H application, or SA70H equivalent, this page provides verified electrical parameters, clamping performance under 10/1000μs transients, thermal derating behavior, polarity marking, and AEC-Q101 compliance status - all critical for ESD and load-dump protection design validation.
Technical Context
The SA70H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (77.8–95.1V). Its low dynamic impedance enables rapid clamping to ≤125V at 4.2A, limiting energy dissipation during 10/1000μs surges. It exhibits <1μA reverse leakage at 70V and a 94mV/°C temperature coefficient of VBR.
Designed for single-polarity DC protection, it features pure tin-plated leads compliant with J-STD-002, UL 94V-0 molding compound, and JESD201 Class 2 whisker resistance. Maximum junction temperature is rated at +175°C, with operating range from –55°C to +175°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse voltage before conduction begins; defines safe operating margin for 70V DC systems. |
| VBR @ 1mA | 77.8–95.1 V - Breakdown voltage range at 1mA test current; ensures reliable turn-on above system nominal voltage. |
| VC @ IPPM | 125 V at 4.2 A - Clamping voltage during 10/1000μs surge; limits downstream IC stress to ≤125V under worst-case 500W transient. |
| PPK | 500 W - Peak pulse power rating per 10/1000μs waveform; supports automotive load-dump and ISO 7637-2 Pulse 5a/b immunity. |
| IR @ VWM | <1 μA - Reverse leakage at 70V; negligible power loss and signal integrity impact in high-impedance bias networks. |
| TJ MAX | +175 °C - Maximum junction temperature; enables placement near hot components (e.g., power MOSFETs, inductors) without thermal derating concerns. |
| Package | DO-204AC (DO-15) - Industry-standard axial-leaded package with cathode band marking; compatible with through-hole reflow and wave soldering. |
Pinout & Package
SA70H is a two-terminal unidirectional TVS diode in DO-204AC (DO-15) package. The cathode is marked by a band on the body; anode is unmarked. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Low-side reference terminal | Connected to circuit ground or low-voltage rail; completes clamping path during overvoltage events. |
| Cathode (banded end) | High-side surge input terminal | Connected to protected line (e.g., 70V supply rail); conducts avalanche current when VLINE > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood applications including engine control units and body electronics. |
| 500W 10/1000μs surge rating | Withstands ISO 7637-2 Pulse 5a (load dump) up to 500W without degradation. |
| Clamping voltage ≤125V at 4.2A | Ensures protected ICs (e.g., 100V-rated CAN transceivers) remain within absolute maximum ratings during transients. |
| Fast response time <1.0ps | Activates before ESD or fast transients damage sensitive inputs; no external triggering required. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing. |
Applications
| Automotive Power Rail Protection | Industrial DC Power Input |
|---|---|
Use Scenario: Protecting 70V battery-fed ECUs against load dump transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 70V supply rail and chassis ground. Use Value: Limits voltage excursion to ≤125V during 500W surges, preserving MCU, CAN transceiver, and sensor front-end reliability. | Use Scenario: Safeguarding programmable logic controller (PLC) 72V DC input against switching transients from inductive loads. IC Role / Device Role / Timing Role: Standoff protector on main DC input before bulk capacitor and DC-DC converter. Use Value: Absorbs 10/1000μs spikes up to 4.2A without latch-up, enabling robust operation in factory automation environments. |
| LED Driver Supply Protection | Telecom DC Feeder Line |
Use Scenario: Securing constant-current LED driver ICs powered from 70V bus in streetlight systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on HV DC input to LED driver controller. Use Value: Prevents catastrophic failure of gate drivers and current-sense amplifiers during lightning-induced surges on outdoor wiring. | Use Scenario: Protecting telecom remote radio head (RRH) power feeders operating at 70–80V DC. IC Role / Device Role / Timing Role: First-line transient suppressor on -48V to -72V DC feeder line entering base station equipment. Use Value: Maintains ≤125V clamping level across full temperature range (-55°C to +175°C), ensuring uptime in harsh outdoor deployments. |
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; bidirectional; VBR = 77.8–86.0V; VC = 113V @ 4.6A. | Supports AC-coupled or dual-rail protection; not AEC-Q101 qualified. | Select SMAJ70A only if bidirectional clamping is required and automotive qualification is unnecessary. |
| P6SMB70A | DO-214AA package; bidirectional; VBR = 77.8–86.0V; VC = 113V @ 4.6A; 600W rating. | Larger footprint than DO-15; higher PPK but same clamping; no AEC-Q101 certification. | Choose P6SMB70A when board space allows larger SMC package and 600W margin is needed beyond 500W. |
Compared with SMAJ70A and P6SMB70A, SA70H offers AEC-Q101 qualification and DO-204AC (DO-15) form factor ideal for legacy through-hole automotive designs, while maintaining identical VBR and tighter thermal spec (TJ max = +175°C).
Availability
SA70H is available at Aetrix Electronics and suitable for automotive ECU protection, industrial DC power input conditioning, and LED driver surge immunity requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for SA70H 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, serving automotive, industrial, and consumer markets since 1979.
The SA Series TVS diodes are engineered for high-reliability transient suppression in harsh environments, with emphasis on AEC-Q101 compliance, tight parameter distribution, and robust package construction for under-hood and factory-floor deployment.
FAQ
What is the breakdown voltage range of SA70H?
The SA70H has a minimum breakdown voltage (VBR) of 77.8 V and a maximum of 95.1 V at 1 mA test current, measured per ANSI/IEEE C62.35. This range ensures consistent turn-on behavior across production lots while accommodating thermal drift and process variation. The SA70H's specified VBR directly supports 70 V nominal systems with adequate margin against false triggering.
Is SA70H unidirectional or bidirectional?
SA70H is a unidirectional TVS diode, indicated by the absence of "CA" or "C" suffix and confirmed by its single cathode band marking per DO-204AC mechanical drawing. It protects only against reverse-polarity transients on positive-rail applications. For bidirectional protection, SA70A (with "A" suffix) is the designated variant, though SA70H itself is strictly unidirectional.
Does SA70H meet AEC-Q101 reliability standards?
Yes, SA70H is explicitly AEC-Q101 qualified, as stated in the "FEATURES" section and confirmed in the Ordering Information table where "H" denotes AEC-Q101 qualification. This includes stress testing for temperature cycling, humidity bias, mechanical shock, and high-temperature operating life - making SA70H suitable for automotive powertrain and chassis modules.
What is the maximum clamping voltage of SA70H at rated surge current?
The SA70H clamps to a maximum of 125 V at its rated peak pulse current of 4.2 A under the standard 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events, directly enabling compatibility with 100 V-rated interface ICs.
Can SA70H be used in surface-mount designs?
No, SA70H uses the DO-204AC (DO-15) axial-leaded package and is intended for through-hole mounting only. It is not compatible with SMT reflow profiles or pick-and-place assembly. For surface-mount equivalents, consider SMAJ70A (DO-214AC) or SMCJ70A (DO-214AB), though neither carries AEC-Q101 qualification like SA70H.
SA70H 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:
- -
- 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)
SA70H FAQ
1.How can I place an order for SA70H through Aetrix?
Please submit a Request for Quotation (RFQ) for SA70H 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 SA70H reliable?
The price and inventory of SA70H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA70H is usually 5 days.
3.What payment methods are accepted for SA70H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA70H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA70H?
SA70H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA70H 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 SA70H?
For technical support, including SA70H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA70H requirements.
6.How does Aetrix verify that SA70H is sourced from the original manufacturer or authorized distributors?
All SA70H 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 SA70H meets industry standards.
7.What is the process for return or replacement of SA70H?
All SA70H units undergo pre-shipment inspection (PSI). If there is an issue with SA70H, 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 SA70H part is unused and in its original packaging.
Return procedure for SA70H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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