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Taiwan Semiconductor Corporation SA40CH
- Part No.:
- SA40CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA40CH.pdf
- Description:
- 500W, 49.4V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,737
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Product details
Overview
SA40CH from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 40V working stand-off voltage (VWM), 44.4–54.3V breakdown voltage (VBR @ 1mA), and 71.4V maximum clamping voltage (VC) at 7.3A peak pulse current. It delivers AEC-Q101 qualification for automotive-grade surge protection in power supply rails and interface lines.
For engineers reviewing the SA40CH datasheet, SA40CH pinout, SA40CH application, or SA40CH equivalent, this page provides verified electrical parameters, clamping behavior under 10/1000μs transients, thermal derating curves, polarity marking guidance, and direct alternatives with documented VWM/VC/IPPM trade-offs.
Technical Context
The SA40CH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (44.4–54.3V). Its low dynamic impedance enables rapid clamping to ≤71.4V at 7.3A, limiting energy dissipation during 10/1000μs surges per IEC 61000-4-5.
Designed for automotive environments, it supports junction temperatures from –55°C to +175°C, features pure tin-plated leads compliant with J-STD-002, and meets JESD201 Class 2 whisker resistance. Polarity is marked by cathode band; no internal series resistance or integrated capacitance is specified.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before leakage rises above 1 μA |
| VBR min/max | 44.4 / 54.3 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold tolerance |
| VC @ IPPM | 71.4 V - Clamped voltage at 7.3 A peak pulse current; determines worst-case voltage seen by protected IC |
| PPK | 500 W - Peak pulse power handling at 10/1000μs waveform; defines single-event surge robustness |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood automotive locations |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off voltage; ensures minimal standby power loss |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with 0.400 g mass and UL 94V-0 molding compound |
Pinout & Package
DO-204AC (DO-15) axial-leaded package with cathode band marking polarity. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance. Weight: 0.400 g. Molding compound complies with UL 94V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND) in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V rail); cathode band identifies this terminal physically |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics per stress test requirements |
| 500W peak pulse rating | Withstands 10/1000μs transients up to 500W without degradation-meets ISO 7637-2 Pulse 1/2/5a |
| Clamping voltage ≤71.4V | Limits downstream IC stress during 7.3A surge events-critical for 48V system compatibility |
| Low leakage <1μA @ 40V | Minimizes quiescent current draw in always-on vehicle modules such as CAN gateways |
| DO-204AC mechanical robustness | UL 94V-0 flammability rating and JESD201 Class 2 whisker resistance ensure long-term reliability in vibration-prone environments |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12V/48V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to shunt surge energy before reaching LDOs or microcontrollers. Use Value: Clamps to ≤71.4V at 7.3A, preventing latch-up or oxide breakdown in 3.3V/5V logic powered from buck converters. | Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) in PLC I/O modules exposed to EFT bursts. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to absorb fast-rising ESD/EFT pulses before signal conditioning circuitry. Use Value: Sub-nanosecond response time ensures clamping initiates before sensitive op-amps or ADC front-ends experience overvoltage. |
| LED Driver Overvoltage Clamp | Automotive CAN Bus Transient Suppression |
Use Scenario: Preventing catastrophic failure of constant-current LED drivers due to inductive kickback from relay switching. IC Role / Device Role / Timing Role: Placed across driver output terminals to clamp flyback spikes generated by solenoid or lamp loads. Use Value: 500W surge rating handles repetitive 8.3ms half-sine surges up to 70A IFSM-survives repeated relay cycling. | Use Scenario: Adding secondary-level protection on CAN_H/CAN_L lines beyond transceiver's built-in ESD capability. IC Role / Device Role / Timing Role: Unidirectional SA40CH used on CAN_H (with ground reference) to suppress common-mode surges exceeding transceiver limits. Use Value: 40V VWM aligns with CAN bus nominal 2.5V differential swing while blocking normal operation voltage but clamping >44.4V faults. |
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 SMAJ40A | VWM = 40V, VC = 64.5V @ 7.8A, DO-214AC package, AEC-Q101 qualified | Lower clamping voltage but surface-mount; requires PCB rework vs. axial SA40CH | Select SMAJ40A for space-constrained SMT designs where 7.7V lower VC improves margin for 3.3V logic interfaces |
| Vishay 1.5KE40A | VWM = 34.2V, VC = 64.3V @ 23.3A, DO-201AD package, 1500W rating, not AEC-Q101 qualified | Higher power rating but wider VWM tolerance; lacks automotive qualification and tighter IR spec | Select 1.5KE40A only for non-automotive industrial use where higher surge repetition is needed and qualification is not required |
Compared with SMAJ40A and 1.5KE40A, the SA40CH offers identical VWM and AEC-Q101 compliance in an axial DO-15 package-ideal for legacy through-hole automotive harnesses-while its 71.4V clamping provides predictable protection for 48V-compatible controllers without requiring layout changes.
Availability
SA40CH is available at Aetrix Electronics and suitable for automotive ECU power rail protection, industrial sensor interface hardening, and LED driver overvoltage clamping requiring stable component supply across multi-year production cycles.
Supply support for SA40CH 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 developed specifically for high-reliability transient suppression in harsh automotive environments, emphasizing AEC-Q101 compliance, tight VBR tolerances, and robust DO-204AC packaging for under-hood deployment.
FAQ
What is the clamping voltage of SA40CH and how is it measured?
The SA40CH has a maximum clamping voltage (VC) of 71.4 V, measured at 7.3 A peak pulse current (IPPM) under the standard 10/1000 μs double-exponential surge waveform. This value is guaranteed per the datasheet's "Maximum clamping voltage VC@IPPM" specification and reflects worst-case voltage imposed on protected circuitry during a defined transient event.
Is SA40CH unidirectional or bidirectional, and how is polarity identified?
The SA40CH is a unidirectional TVS diode. Polarity is identified by a cathode band marked on the DO-204AC (DO-15) package body; the banded end is the cathode and must be connected toward the protected line (e.g., 12V rail), while the anode connects to ground. Bidirectional variants use "CA" suffix (e.g., SA40CA), which SA40CH does not have.
Does SA40CH meet automotive qualification standards?
Yes, SA40CH is AEC-Q101 qualified, as confirmed in the "FEATURES" section of the official datasheet. This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD, making it suitable for automotive powertrain, chassis, and body electronics applications where reliability under thermal and mechanical stress is critical.
What is the maximum junction temperature rating for SA40CH?
The SA40CH has a maximum junction temperature (TJ MAX) rating of +175 °C, enabling reliable operation in high-ambient environments such as engine compartments or power inverters. This rating is specified in the "ABSOLUTE MAXIMUM RATINGS" table and supports continuous operation up to that limit when thermal design (e.g., pad size, airflow) meets derating guidelines in Fig.2 of the datasheet.
How does SA40CH compare to SA40A in terms of electrical performance?
The SA40CH differs from SA40A primarily in qualification and marking: SA40CH is AEC-Q101 qualified and uses "H" suffix per ordering code, whereas SA40A is the standard industrial version. Electrically, both share identical VWM (40 V), VBR (44.4–54.3 V), VC (71.4 V), and IPPM (7.3 A); the "H" denotes enhanced process control and test screening-not parameter deviation.
SA40CH 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 71.4V
- Current - Peak Pulse (10/1000µs):
- 7.3A
- 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)
SA40CH FAQ
1.How can I place an order for SA40CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA40CH 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 SA40CH reliable?
The price and inventory of SA40CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA40CH is usually 5 days.
3.What payment methods are accepted for SA40CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA40CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA40CH?
SA40CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA40CH 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 SA40CH?
For technical support, including SA40CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA40CH requirements.
6.How does Aetrix verify that SA40CH is sourced from the original manufacturer or authorized distributors?
All SA40CH 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 SA40CH meets industry standards.
7.What is the process for return or replacement of SA40CH?
All SA40CH units undergo pre-shipment inspection (PSI). If there is an issue with SA40CH, 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 SA40CH part is unused and in its original packaging.
Return procedure for SA40CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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