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Vishay General Semiconductor - Diodes Division SA18CHE3/73
- Part No.:
- SA18CHE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA18CHE3/73.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,474
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Product details
Overview
SA18CHE3/73 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 a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 500 W peak pulse power (10/1000 μs), 17.1 A peak pulse current (IPPM), and clamps to ≤29.2 V at rated IPPM - used in automotive sensor interface protection and industrial I/O line surge suppression.
For engineers reviewing the SA18CHE3/73 datasheet, SA18CHE3/73 pinout, SA18CHE3/73 application, or SA18CHE3/73 equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, DO-15 mechanical data, clamping behavior under 10/1000 μs surges, and direct alternatives for bi-directional TVS selection in harsh-environment electronics.
Technical Context
This bi-directional TVS operates symmetrically across both polarities with identical VBR min/max (20.0–22.1 V), ID ≤1.0 μA at VWM = 18 V, and clamps to ≤29.2 V at IPPM = 17.1 A. Its glass-passivated junction enables fast response (<1 ns) and low incremental surge resistance, critical for protecting downstream MOSFETs or MCU I/O pins from ESD and inductive switching spikes.
Rated for TJ = –55 °C to +175 °C and qualified to AEC-Q101, SA18CHE3/73 supports automotive-grade reliability. Its 3.0 W steady-state power dissipation (at TL = 75 °C) and 275 °C solder dip tolerance (10 s) confirm suitability for reflow and wave-solder assembly in high-volume production.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before clamping begins; defines safe working range for 12 V nominal systems. |
| VBR @ IT = 1 mA | 20.0–22.1 V - guaranteed breakdown onset; ensures predictable clamping initiation without premature conduction. |
| IPPM (10/1000 μs) | 17.1 A - peak transient current it safely shunts; determines minimum trace width and PCB layout margin for surge paths. |
| VC @ IPPM | ≤29.2 V - maximum clamped voltage seen by protected circuit; must stay below IC absolute maximum ratings. |
| PPPM | 500 W - peak pulse power handling; validates robustness against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges. |
| TJ max. | +175 °C - extended junction temperature rating; supports under-hood automotive placement and high-ambient industrial use. |
| AEC-Q101 | Qualified - certified for automotive applications per stress test requirements including HTOL, TC, AC/DC life tests. |
Pinout & Package
SA18CHE3/73 uses the DO-204AC (DO-15) axial-leaded package: molded epoxy body (UL 94 V-0), matte tin-plated leads, no polarity marking (bi-directional). Lead length ≥1.0 inch (25.4 mm), diameter 0.028–0.034 inch (0.71–0.86 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional transient conduction path | No polarity marking required; either lead serves as input/output - simplifies PCB layout and eliminates orientation errors. |
| Leads (both) | Thermal and current path to PCB copper | Designed for 275 °C solder dip (10 s); thermal mass and lead geometry support reliable heat dissipation during surge events. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Enables <1 ns response time and stable VBR over lifetime - critical for suppressing fast ESD (IEC 61000-4-2) and lightning-induced edges. |
| 500 W peak pulse power (10/1000 μs) | Validated for repetitive 0.01% duty cycle surges - supports protection in continuously monitored industrial control loops. |
| AEC-Q101 qualification | Confirms reliability under automotive temperature cycling, humidity bias, and high-temperature operating life - no additional qualification needed for Tier 1 designs. |
| Low incremental clamping resistance | Ensures VC stays tightly bounded near VBR (ΔVC = VC − VBR ≤ 9.2 V), minimizing voltage overshoot into protected ICs. |
| RoHS-compliant HE3 suffix | Indicates AEC-Q101 qualified, JESD 201 Class 2 whisker-resistant finish - meets automotive supply chain material compliance mandates. |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load-dump and jump-start transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed between signal line and ground, responding within nanoseconds to suppress >100 V spikes. Use Value: Maintains signal integrity by clamping transients to ≤29.2 V while surviving repeated 500 W surges - extends MCU and transceiver lifetime in harsh environments. |
Use Scenario: Safeguarding 24 V DC digital inputs on programmable logic controllers exposed to relay coil flyback and motor drive noise in factory automation. IC Role / Device Role / Timing Role: Standoff-rated (18 V) TVS absorbing inductive kick energy before it reaches input conditioning circuitry or optocouplers. Use Value: Prevents false triggering and latch-up by limiting transient voltage to safe levels without adding capacitance that degrades 10 kHz+ input response. |
| Telecom Line Surge Suppression | Consumer Appliance Motor Control Protection |
Use Scenario: Shielding RS-485/RS-232 communication ports in base stations and network equipment from induced lightning surges on long cable runs. IC Role / Device Role / Timing Role: Primary-level bi-directional clamp on differential pair, coordinated with GDT or secondary TVS for multi-stage protection. Use Value: Withstands 10/1000 μs surges up to 17.1 A while maintaining low leakage (<1 μA), preserving signal-to-noise ratio in low-power receivers. |
Use Scenario: Protecting microcontroller GPIOs and gate drivers in washing machine or HVAC control boards from brush motor commutation spikes. IC Role / Device Role / Timing Role: Localized transient suppressor mounted directly at motor driver IC power pins or feedback sensing nodes. Use Value: Eliminates need for external snubbers by clamping spikes to ≤29.2 V with no timing delay - reduces BOM count and board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | Same VWM (18 V), lower PPPM (400 W), SMA package (surface-mount), 14.4 A IPPM | Preferred where PCB space is constrained and reflow-only assembly is used; lacks AEC-Q101 qualification | Select SMAJ18CA for cost-sensitive consumer designs requiring SMT footprint and moderate surge immunity. |
| P6SMB18CA | Same VWM (18 V), same PPPM (600 W), DO-214AA (SMB) package, 32.5 A IPPM, AEC-Q101 qualified | Higher surge capacity and larger thermal mass; requires different pad layout and higher mounting torque | Choose P6SMB18CA when system-level testing demands >500 W margin or extended surge repetition capability. |
Compared with SA18CHE3/73, SMAJ18CA trades AEC-Q101 and axial-leaded robustness for compact SMT integration, while P6SMB18CA offers higher surge headroom in a larger SMB package - both require layout revision but match 18 V bi-directional clamping function.
Availability
SA18CHE3/73 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC inputs, telecom line protection, and appliance motor control circuits requiring stable component supply and AEC-Q101 assurance.
Supply support for SA18CHE3/73 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 and application-specific performance.
The SAxxxA/SAxxxCA series delivers standardized TVS protection across 5.0–170 V ranges, engineered for automotive, industrial, and telecom surge immunity where bi-directional clamping and AEC-Q101 validation are mandatory.
FAQ
What is the polarity configuration of SA18CHE3/73?
SA18CHE3/73 is a bi-directional TVS diode with symmetrical conduction characteristics in both directions. It has no cathode marking on the DO-204AC package, confirming its bidirectional functionality - unlike uni-directional variants (e.g., SA18A) which feature a band-marked cathode. This allows flexible placement on PCBs without orientation constraints.
Is SA18CHE3/73 qualified for automotive applications?
Yes, SA18CHE3/73 carries the HE3 suffix, indicating full AEC-Q101 qualification per Vishay's documentation (Rev. 18-Sep-12, Doc. #88378). It has passed high-temperature operating life, temperature cycling, and humidity bias tests required for under-hood and chassis-mounted automotive electronics.
What is the maximum clamping voltage for SA18CHE3/73 at its rated peak pulse current?
The maximum clamping voltage (VC) for SA18CHE3/73 is 29.2 V at its rated peak pulse current (IPPM) of 17.1 A under a 10/1000 μs waveform. This value is specified in the Electrical Characteristics table and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
How does the HE3 suffix differ from the E3 suffix in SA18CHE3/73?
The HE3 suffix in SA18CHE3/73 denotes AEC-Q101 qualification and JESD 201 Class 2 whisker resistance, whereas E3 indicates RoHS compliance only (commercial grade). Both share DO-204AC packaging and identical electrical specs, but HE3 is mandatory for automotive Tier 1 designs requiring validated reliability.
Can SA18CHE3/73 be used in place of a uni-directional TVS like SA18A?
No - SA18CHE3/73 is bi-directional and lacks polarity marking, while SA18A is uni-directional with a cathode band. Substituting SA18CHE3/73 for SA18A may cause unintended conduction during forward-biased operation. Use only in circuits explicitly designed for bi-directional clamping, such as AC signal lines or differential buses.
SA18CHE3/73 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 15.5A
- 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)
SA18CHE3/73 FAQ
1.How can I place an order for SA18CHE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA18CHE3/73 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 SA18CHE3/73 reliable?
The price and inventory of SA18CHE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA18CHE3/73 is usually 5 days.
3.What payment methods are accepted for SA18CHE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA18CHE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA18CHE3/73?
SA18CHE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA18CHE3/73 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 SA18CHE3/73?
For technical support, including SA18CHE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA18CHE3/73 requirements.
6.How does Aetrix verify that SA18CHE3/73 is sourced from the original manufacturer or authorized distributors?
All SA18CHE3/73 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 SA18CHE3/73 meets industry standards.
7.What is the process for return or replacement of SA18CHE3/73?
All SA18CHE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA18CHE3/73, 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 SA18CHE3/73 part is unused and in its original packaging.
Return procedure for SA18CHE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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