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Taiwan Semiconductor Corporation SA64CH
- Part No.:
- SA64CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA64CH.pdf
- Description:
- 500W, 79V, 10%, BIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:3,183
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Product details
Overview
SA64CH from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, 64V working stand-off voltage (VWM), 71.1–86.9V breakdown voltage (VBR), and clamping voltage of 114V at 4.6A peak pulse current. It protects automotive and industrial power rails against ESD, EFT, and inductive switching transients.
For engineers reviewing the SA64CH datasheet, SA64CH pinout, SA64CH application, or SA64CH equivalent, key selection criteria include its AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.59), <1μA reverse leakage at 64V, 175°C max junction temperature, and DO-15 mechanical compatibility with legacy through-hole surge protection layouts.
Technical Context
The SA64CH operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR range (71.1–86.9V at 1mA test current). Its clamping action limits transient voltages to ≤114V at 4.6A, delivering robust protection for 12V/24V/48V DC systems without crowbar behavior.
Designed for non-repetitive surge events per IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive load dump), it features fast response (<1.0ps from 0V to VBR), low dynamic impedance, and thermal stability up to 175°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - Maximum continuous reverse operating voltage before conduction begins; sets system operating margin for 48V nominal rails. |
| VBR min/max | 71.1 / 86.9 V @ 1 mA - Confirmed avalanche onset range; ensures reliable turn-on above normal operating voltage with process tolerance. |
| VC @ IPPM | 114 V @ 4.6 A - Clamped voltage during 10/1000μs surge; defines worst-case overvoltage seen by protected ICs. |
| PPK | 500 W - Peak pulse power rating at TA = 25°C; supports high-energy transients common in automotive and industrial environments. |
| IR @ VWM | <1 μA - Reverse leakage at 64V; minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| TJ max | 175 °C - Maximum junction temperature; enables operation in under-hood and enclosed industrial enclosures without derating. |
| Package | DO-204AC (DO-15) - Standard through-hole package with tin-plated leads; compatible with wave soldering and legacy PCB footprints. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy case with cathode band marking polarity. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to circuit ground or low-side return path; completes conduction loop during transient clamp. |
| Cathode | Protected line input | Connected to the line being protected (e.g., 48V supply rail); blocks forward current and conducts reverse surges to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS power domains. |
| Clamping voltage ratio VC/VBR | ≤1.59 - Low ratio ensures minimal overvoltage stress on downstream components during surge events. |
| Fast response time | <1.0 ps - Enables suppression of nanosecond-scale ESD events before sensitive logic is damaged. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 - Supports environmentally regulated industrial and automotive manufacturing requirements. |
| Surge robustness | 500W @ 10/1000μs - Withstands high-energy load dump and inductive kickback without degradation. |
Applications
| Automotive Power Rail Protection | Industrial 48V DC System Protection |
|---|---|
Use Scenario: Protecting 48V battery management system (BMS) input stages from ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 3b (EFT). IC Role / Device Role / Timing Role: Unidirectional TVS placed between 48V rail and chassis ground to clamp transients before they reach DC-DC controllers and monitoring ICs. Use Value: Limits voltage excursion to ≤114V during 500W surges, preserving reliability of 100V-rated MOSFETs and analog front-ends. | Use Scenario: Safeguarding programmable logic controller (PLC) digital I/O modules against field-wiring induced transients in factory automation. IC Role / Device Role / Timing Role: Standoff protection device on 48V auxiliary supply lines feeding isolated RS-485 transceivers and optocouplers. Use Value: Maintains signal integrity by preventing latch-up in communication ICs during repetitive EFT bursts (IEC 61000-4-4 Level 4). |
| LED Driver Input Stage Protection | Telecom Power Shelf Surge Suppression |
Use Scenario: Shielding constant-current LED driver ICs from voltage spikes caused by hot-plug events or cable discharge in streetlight systems. IC Role / Device Role / Timing Role: Primary surge clamp on the 48V input bus upstream of buck converter stage and current-sense amplifier. Use Value: Prevents permanent damage to precision current mirrors and gate drivers by limiting peak voltage to 114V during 10/1000μs surges. | Use Scenario: Front-end protection for 48V telecom power shelves exposed to lightning-induced surges on distribution lines. IC Role / Device Role / Timing Role: First-line unidirectional TVS on main DC input bus, coordinated with MOVs and gas discharge tubes in multi-stage architecture. Use Value: Absorbs initial 500W energy burst with predictable clamping, enabling downstream devices to handle residual energy without overstress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A | Same DO-214AC package; lower PPK (400W); higher clamping voltage (103V @ 4.3A); no AEC-Q101 qualification. | Not suitable for automotive under-hood use; acceptable for commercial-grade 48V systems with lower surge exposure. | Select SMAJ64A only if AEC-Q101 compliance is unnecessary and layout space allows SMA footprint change. |
| P6KE68A | DO-15 package; lower PPK (600W but derated at elevated TA); higher VWM (58V); clamping voltage 118V @ 5.2A; no AEC-Q101. | Limited to industrial ambient temperatures ≤125°C; requires thermal derating above 25°C due to lower TJ max (150°C). | Choose P6KE68A only for cost-sensitive non-automotive designs where 58V VWM provides sufficient margin over 48V rail. |
Compared with SMAJ64A and P6KE68A, SA64CH delivers guaranteed AEC-Q101 qualification, tighter VBR tolerance (71.1–86.9V vs. ±5% typical), lower leakage (<1μA), and validated 175°C operation-making it the sole choice for automotive-grade 48V protection where reliability and temperature resilience are mandatory.
Availability
SA64CH is available at Aetrix Electronics and suitable for automotive power rail protection, industrial 48V DC systems, and LED driver input stage protection requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for SA64CH 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, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SA Series was designed specifically for high-reliability transient suppression in harsh environments, with AEC-Q101 variants like SA64CH targeting automotive power distribution, body control modules, and electrified vehicle subsystems.
FAQ
What is the maximum clamping voltage of the SA64CH under standard 10/1000μs surge conditions?
The SA64CH has a maximum clamping voltage (VC) of 114 V at 4.6 A peak pulse current under the 10/1000μs waveform. This value is measured per IEC 61000-4-5 and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The clamping performance is guaranteed across the full operating temperature range and is integral to the device's ability to safeguard 48V system components.
Is the SA64CH suitable for bidirectional transient protection applications?
No, the SA64CH is a unidirectional TVS diode and is not rated for bidirectional operation. Its electrical characteristics-including breakdown voltage, clamping, and leakage-are specified only for reverse-biased conduction. For bidirectional protection, TSC offers the SA64CA variant (with 'CA' suffix), which provides symmetrical clamping in both polarities and is explicitly characterized for bipolar use per SA Series documentation.
Does the SA64CH require a heatsink for continuous operation at 75°C ambient?
No, the SA64CH does not require a heatsink for steady-state operation because it is designed for transient (non-repetitive) duty. Its steady-state power dissipation (PD) is rated at 3 W at TL = 75°C with 9.5 mm lead lengths on 10 × 10 mm copper pads-sufficient for typical mounting without additional thermal management. Continuous DC power handling is not its intended function; it is optimized for short-duration surge absorption.
How does the AEC-Q101 qualification of the SA64CH impact its use in automotive designs?
The AEC-Q101 qualification of the SA64CH certifies that it has passed accelerated stress tests-including temperature cycling, humidity bias HAST, and mechanical shock-specifically defined for discrete semiconductors in automotive applications. This qualification validates its suitability for under-hood and chassis-mounted locations where vibration, thermal cycling, and long service life are critical, and is required for Tier 1 supplier BOM acceptance in passenger vehicles and commercial EV platforms.
What is the reverse leakage current specification for the SA64CH at its full working stand-off voltage?
The SA64CH exhibits reverse leakage current (IR) of less than 1 μA at its full working stand-off voltage of 64 V, measured at TA = 25°C. This ultra-low leakage ensures negligible standby power loss in always-on 48V systems and prevents false triggering or voltage droop in high-impedance sensing nodes-critical for battery monitoring and precision analog interfaces downstream of the SA64CH.
SA64CH 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):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 114V
- 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)
SA64CH FAQ
1.How can I place an order for SA64CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA64CH 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 SA64CH reliable?
The price and inventory of SA64CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA64CH is usually 5 days.
3.What payment methods are accepted for SA64CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA64CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA64CH?
SA64CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA64CH 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 SA64CH?
For technical support, including SA64CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA64CH requirements.
6.How does Aetrix verify that SA64CH is sourced from the original manufacturer or authorized distributors?
All SA64CH 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 SA64CH meets industry standards.
7.What is the process for return or replacement of SA64CH?
All SA64CH units undergo pre-shipment inspection (PSI). If there is an issue with SA64CH, 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 SA64CH part is unused and in its original packaging.
Return procedure for SA64CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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