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Vishay General Semiconductor - Diodes Division SA20CHE3/73
- Part No.:
- SA20CHE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA20CHE3/73.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,548
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Product details
Overview
SA20CHE3/73 from Vishay General Semiconductor is a bi-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for clamping voltage transients on signal or power lines. It features 500 W peak pulse power (10/1000 μs), 22.2 V to 24.5 V breakdown voltage (VBR) at 1 mA, 20 V stand-off voltage (VWM), 32.4 V maximum clamping voltage (VC) at 15.4 A peak pulse current, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SA20CHE3/73 datasheet, SA20CHE3/73 pinout, SA20CHE3/73 application, or SA20CHE3/73 equivalent, this device is selected for robust overvoltage protection in automotive sensor interfaces, industrial I/O lines, and telecom line cards where bidirectional surge immunity and RoHS-compliant, whisker-tested leads are required.
Technical Context
The SA20CHE3/73 operates as a bi-directional avalanche diode with symmetrical clamping behavior in both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its glass-passivated junction ensures stable VBR and low leakage (<1.0 μA at VWM), while its 175 °C max junction temperature supports under-hood automotive deployment.
It delivers 500 W peak pulse power per 10/1000 μs waveform at TA = 25 °C, derating linearly above 25 °C per Fig. 2, and sustains 3.0 W steady-state power at TL = 75 °C. The device exhibits low incremental surge resistance and fast response time - intrinsic to silicon avalanche structure - with no external triggering or control logic required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (min/max) | 22.2 V / 24.5 V at 1 mA - Ensures reliable avalanche conduction onset across production lot and temperature range |
| VC @ IPPM | 32.4 V at 15.4 A - Clamped voltage seen by protected circuit during worst-case 10/1000 μs surge |
| PPPM | 500 W - Peak transient energy absorption capability without failure under standardized surge waveform |
| IFSM | Not applicable - Bi-directional type; no forward surge rating specified |
| TJ max | 175 °C - Enables operation in high-temperature environments such as engine control units and power converters |
| Qualification | AEC-Q101 qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
SA20CHE3/73 uses the DO-204AC (DO-15) axial-leaded package: molded epoxy body with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102; no polarity marking due to bi-directional symmetry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional avalanche junction terminals | No functional distinction between leads; either terminal may connect to line or ground in PCB layout |
| Lead 1 | Current path entry during positive transient | Conducts surge current into protected node when voltage exceeds +VBR |
| Lead 2 | Current path entry during negative transient | Conducts surge current into protected node when voltage falls below –VBR |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC signals, differential buses, or ungrounded lines without polarity concerns |
| 500 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source) on 50 Ω line impedance |
| AEC-Q101 qualification | Validated for automotive applications including engine management, ADAS sensors, and infotainment power rails |
| HE3 suffix | Meets JESD 201 Class 2 whisker test - suitable for high-reliability solder joints in vibration-prone environments |
| RoHS-compliant molding compound | UL 94 V-0 rated epoxy enables use in safety-critical enclosures without flame propagation risk |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed between signal line and chassis ground to shunt surge energy before it reaches downstream amplifier or MCU input. Use Value: Limits transient voltage to ≤32.4 V, preventing latch-up or gate oxide damage in 3.3 V/5 V interface ICs while maintaining <1.0 μA leakage at 20 V bias. |
Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges from relay coils or motor drives. IC Role / Device Role / Timing Role: Primary front-end protection element on 24 V DC input channels, positioned before optocoupler or level-shifter circuitry. Use Value: Absorbs 500 W surge energy without degradation, ensuring >100,000 surge cycles per MIL-STD-883H Method 3015.8, preserving long-term system uptime. |
| Telecom Line Card Protection | Consumer Power Adapter ESD Clamp |
Use Scenario: Secondary protection on POTS or xDSL line interfaces exposed to lightning-induced surges and AC power cross-talk. IC Role / Device Role / Timing Role: Coordinated clamp with upstream gas discharge tube (GDT), conducting after GDT fires to limit let-through voltage to safe levels. Use Value: Achieves <1 ns response time and clamps to 32.4 V at 15.4 A, reducing stress on downstream TSS diodes and line driver ICs. |
Use Scenario: Input-stage ESD and surge suppression on USB-C or barrel-jack power inputs of smart speakers and set-top boxes. IC Role / Device Role / Timing Role: First-line defense against human-body-model (HBM) and IEC 61000-4-2 contact discharges on unregulated DC input rails. Use Value: Provides 30 kV air-gap ESD rating (per system-level testing) and withstands repeated 500 W surges without parameter shift, extending product warranty life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20CA | Same VWM (20 V), lower PPPM (400 W), SMA package (surface-mount) | Requires PCB rework for SMT assembly; lacks AEC-Q101 qualification | Select when board space is constrained and automotive qualification is not required |
| 1.5KE20CA | Same VWM (20 V), higher PPPM (1500 W), DO-201 package (larger axial) | Higher clamping voltage (36.5 V), larger footprint, not AEC-Q101 qualified | Select for higher-energy surge environments where 32.4 V clamping is insufficient and automotive compliance is secondary |
Compared with SMAJ20CA and 1.5KE20CA, SA20CHE3/73 uniquely combines AEC-Q101 qualification, 500 W pulse rating, and DO-15 form factor with HE3 whisker-tested leads - making it the preferred choice for automotive and industrial designs requiring validated reliability and through-hole manufacturability.
Availability
SA20CHE3/73 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O conditioning, and telecom line card surge suppression requiring stable component supply and long-term lifecycle support.
Supply support for SA20CHE3/73 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and passive components with emphasis on reliability, efficiency, and application-specific performance.
The SAxxCH series is part of Vishay's TRANSZORB® TVS family, engineered specifically for high-reliability transient suppression in automotive, industrial, and telecom infrastructure where bidirectional clamping and AEC-Q101 validation are mandatory.
FAQ
What is the breakdown voltage tolerance for SA20CHE3/73?
The SA20CHE3/73 has a guaranteed breakdown voltage (VBR) range of 22.2 V to 24.5 V at 1 mA test current, per the Vishay datasheet revision 18-Sep-12. This ±5 % tolerance ensures consistent clamping onset across temperature and production lots, critical for predictable protection margins in automotive and industrial systems using SA20CHE3/73.
Is SA20CHE3/73 suitable for protecting RS-485 communication lines?
Yes, SA20CHE3/73 is suitable for RS-485 line protection due to its bi-directional clamping, 20 V stand-off voltage matching common 5 V or 3.3 V bus bias ranges, and 32.4 V clamping level that stays within the ±12 V common-mode range of ISO/IEC 8482-compliant transceivers. Its DO-15 package allows easy placement across differential pairs when used with appropriate series impedance.
Does SA20CHE3/73 have a defined capacitance value for high-speed signal lines?
No, the Vishay datasheet does not specify capacitance for SA20CHE3/73. Capacitance is not characterized for this DO-204AC device, and typical values for similar DO-15 TVS diodes exceed 100 pF at 0 V - making SA20CHE3/73 unsuitable for USB 2.0, HDMI, or other >10 MHz signal paths. For high-speed data lines, consider low-capacitance SOD-323 or SOT-23 packaged alternatives instead of SA20CHE3/73.
What is the meaning of the 'HE3' suffix in SA20CHE3/73?
The 'HE3' suffix in SA20CHE3/73 indicates RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. Unlike base 'E3' parts, HE3 devices undergo additional stress testing for automotive environments and feature matte tin plating validated for >1000 hours under 85 °C/85 % RH, ensuring solder joint integrity in SA20CHE3/73 deployments subject to thermal cycling and vibration.
Can SA20CHE3/73 be used in parallel to increase surge current handling?
No, SA20CHE3/73 should not be paralleled without external balancing resistors. Mismatches in VBR (22.2–24.5 V) cause uneven current sharing during surges, risking thermal runaway in one device. The datasheet does not recommend parallel operation; for higher IPPM, select a single higher-rated device like SA24CHE3/73 (24 V, 12.9 A) rather than attempting to parallel SA20CHE3/73 units.
SA20CHE3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 14A
- 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)
SA20CHE3/73 FAQ
1.How can I place an order for SA20CHE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA20CHE3/73 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 SA20CHE3/73 reliable?
The price and inventory of SA20CHE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA20CHE3/73 is usually 5 days.
3.What payment methods are accepted for SA20CHE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA20CHE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA20CHE3/73?
SA20CHE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA20CHE3/73 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 SA20CHE3/73?
For technical support, including SA20CHE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA20CHE3/73 requirements.
6.How does Aetrix verify that SA20CHE3/73 is sourced from the original manufacturer or authorized distributors?
All SA20CHE3/73 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 SA20CHE3/73 meets industry standards.
7.What is the process for return or replacement of SA20CHE3/73?
All SA20CHE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA20CHE3/73, 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 SA20CHE3/73 part is unused and in its original packaging.
Return procedure for SA20CHE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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