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Vishay General Semiconductor - Diodes Division SA14CHE3/73
- Part No.:
- SA14CHE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA14CHE3/73.pdf
- Description:
- TVS DIODE 14VWM 25.8VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,076
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Product details
Overview
SA14CHE3/73 from Vishay General Semiconductor is a uni-directional TransZORB® transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, designed for clamping inductive switching transients and ESD events on power rails and signal lines. It features a 14 V stand-off voltage (VWM), 15.6–17.2 V breakdown voltage (VBR) at 1 mA, 500 W peak pulse power (10/1000 µs), 21.6 A peak pulse current (IPPM), and clamps to ≤23.2 V at IPPM. It is AEC-Q101 qualified and used for protecting automotive body control modules and industrial sensor interfaces.
For engineers reviewing the SA14CHE3/73 datasheet, SA14CHE3/73 pinout, SA14CHE3/73 application, or SA14CHE3/73 equivalent, this page delivers verified electrical parameters, polarity marking guidance, thermal derating behavior, and validated alternatives for automotive-grade overvoltage protection design.
Technical Context
This TVS diode operates as a voltage-clamping device in uni-directional configuration, with cathode marked by a color band. Its glass-passivated junction enables fast response (<1 ns) and low incremental surge resistance, critical for suppressing fast-rising transients from relay coils or motor commutation.
It is rated for 175 °C maximum junction temperature and derates linearly above 25 °C ambient per Fig. 2; steady-state power dissipation is 3.0 W at 75 °C lead temperature (TL). The device meets JESD 22-B106 solderability (275 °C, 10 s) and JESD 201 Class 2 whisker resistance (HE3 suffix).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin. |
| VBR (min/max) | 15.6 V / 17.2 V at 1 mA - Ensures reliable turn-on within tight tolerance; guarantees clamping activation before downstream IC damage. |
| IPPM | 21.6 A (10/1000 µs) - Peak surge current capability determines survivability against ISO 7637-2 Pulse 1/2a/5a waveforms. |
| VC | ≤23.2 V at IPPM - Clamped voltage level; must stay below absolute maximum rating of protected MOSFET gate or MCU I/O. |
| PPPM | 500 W - Peak pulse power rating confirms suitability for repetitive 0.01% duty cycle surges in automotive load-dump scenarios. |
| TJ max | 175 °C - Enables operation in under-hood environments without thermal shutdown or parameter drift. |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements including HTOL, TC, and HAST. |
Pinout & Package
Package: DO-204AC (DO-15), axial-leaded, molded epoxy case meeting UL 94 V-0. Cathode indicated by color band on one end; anode is unmarked lead.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked lead) | Forward current entry / reverse-biased reference node | Connected to lower-potential side (e.g., ground or return path); defines polarity-sensitive placement in series with protected line. |
| Cathode (banded lead) | Clamping output / surge sink node | Connected to higher-potential side (e.g., +12 V rail or signal line); conducts surge current to ground when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Enables <1 ns response time and stable leakage performance across -55 °C to +175 °C operating range. |
| 500 W peak pulse power (10/1000 µs) | Supports robust protection against ISO 16750-2 load dump and ISO 7637-2 transient pulses without degradation. |
| AEC-Q101 qualification | Validates reliability for automotive applications including engine control units, lighting modules, and ADAS sensor interfaces. |
| Matte tin-plated leads | Ensures solderability per J-STD-002 and JESD 22-B102; HE3 suffix adds JESD 201 Class 2 whisker resistance for high-reliability assembly. |
| Low incremental clamping resistance | Minimizes voltage overshoot during high-di/dt events-critical for protecting sensitive gate drivers and CAN transceivers. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting microcontroller GPIOs and relay driver outputs from inductive kickback during solenoid actuation. IC Role / Device Role / Timing Role: Uni-directional clamping diode placed between 12 V supply rail and ground, with cathode tied to rail. Use Value: Limits transient voltage to ≤23.2 V, preventing latch-up or oxide breakdown in 3.3 V/5 V logic interfaces powered from same rail. |
Use Scenario: Safeguarding 24 V digital input channels against field-wiring induced surges and ESD contact discharge. IC Role / Device Role / Timing Role: Standoff clamping element in parallel with optocoupler input, referenced to common ground. Use Value: Absorbs up to 500 W surge energy while maintaining <1 µA leakage at 14 V, preserving input threshold accuracy. |
| Automotive Lighting Driver | Consumer Appliance Motor Control Board |
Use Scenario: Suppressing back-EMF from LED driver FETs during PWM switching in headlamp modules. IC Role / Device Role / Timing Role: Fast-response TVS placed across drain-source of high-side N-channel MOSFET. Use Value: Clamps voltage spikes within 1 ns, reducing radiated emissions and preventing gate oxide stress during 20 kHz switching. |
Use Scenario: Shielding microcontroller reset and communication lines from brush motor commutation noise. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF) uni-directional suppressor on UART TX/RX lines referenced to system ground. Use Value: Maintains signal integrity at 115.2 kbps by limiting clamping voltage to 23.2 V without distorting edge timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A-E3/5A | Same VWM (14 V), identical DO-214AC (SMA) package; 400 W PPPM, slightly higher VC (23.2 V → 25.8 V). | Lower peak power rating limits use in high-energy load-dump scenarios; better suited for PCB space-constrained designs. | Select SMAJ14A-E3/5A only if board layout favors surface-mount and surge energy remains below 400 W. |
| 1.5KE14A | Higher PPPM (1500 W), larger DO-201AD package; same VWM/VBR range but 5x higher IFSM (200 A vs. 70 A). | Overqualified for most 12 V automotive nodes; requires larger footprint and higher mounting torque. | Choose 1.5KE14A where legacy through-hole compatibility is required and surge energy exceeds 500 W. |
Compared with SMAJ14A-E3/5A and 1.5KE14A, SA14CHE3/73 offers optimal balance of AEC-Q101 qualification, DO-15 mechanical robustness, and 500 W surge handling-making it preferred for new automotive BCM and lighting designs where reliability and standardized leaded packaging are prioritized.
Availability
SA14CHE3/73 is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and consumer appliance designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SA14CHE3/73 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, and protection devices with emphasis on automotive, industrial, and computing applications.
The SAxxA series was developed specifically for AEC-Q101-compliant transient suppression in 12 V/24 V automotive subsystems, balancing high surge capability, tight VBR tolerance, and proven reliability under thermal cycling and humidity stress.
FAQ
What is the polarity marking convention for SA14CHE3/73?
The SA14CHE3/73 is a uni-directional TVS diode with cathode identified by a single color band on the DO-204AC package. When installed, the banded end connects to the higher-potential node (e.g., 12 V rail), and the unmarked lead connects to ground or return. This orientation ensures proper clamping during positive transients while blocking reverse leakage below VWM = 14 V.
Does SA14CHE3/73 meet automotive qualification standards?
Yes, SA14CHE3/73 is AEC-Q101 qualified, as confirmed by Vishay's documentation (Document Number: 88378, Revision: 18-Sep-12). This includes testing for high-temperature operating life, temperature cycling, highly accelerated stress test, and mechanical shock-validating its use in under-hood and cabin automotive modules such as body control units and lighting drivers.
What is the maximum clamping voltage of SA14CHE3/73 at rated surge current?
The SA14CHE3/73 clamps to a maximum of 23.2 V at its rated peak pulse current (IPPM) of 21.6 A, measured using the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and forms the basis for selecting downstream components with appropriate voltage margins, such as 24 V-rated gate drivers or 30 V-input regulators.
Can SA14CHE3/73 be used in bi-directional protection circuits?
No, SA14CHE3/73 is strictly a uni-directional TVS diode. For bi-directional applications-such as AC signal line or differential bus protection-Vishay specifies CA-suffix variants (e.g., SA14CA). Using SA14CHE3/73 in reverse-biased configurations risks permanent breakdown due to lack of symmetrical avalanche structure.
What is the thermal derating behavior of SA14CHE3/73 above 25 °C ambient?
SA14CHE3/73 follows linear derating per Figure 2 in Vishay Document 88378: peak pulse power drops to 50% at ~125 °C junction temperature and reaches zero at 175 °C. For continuous power dissipation, Figure 5 shows 3.0 W at TL = 75 °C, decreasing to ~1.5 W at TL = 125 °C. Designers must calculate actual TJ using θJL ≈ 35 °C/W and ensure margin below 175 °C.
SA14CHE3/73 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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 25.8V
- Current - Peak Pulse (10/1000µs):
- 19.4A
- 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)
SA14CHE3/73 FAQ
1.How can I place an order for SA14CHE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA14CHE3/73 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 SA14CHE3/73 reliable?
The price and inventory of SA14CHE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA14CHE3/73 is usually 5 days.
3.What payment methods are accepted for SA14CHE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA14CHE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA14CHE3/73?
SA14CHE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA14CHE3/73 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 SA14CHE3/73?
For technical support, including SA14CHE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA14CHE3/73 requirements.
6.How does Aetrix verify that SA14CHE3/73 is sourced from the original manufacturer or authorized distributors?
All SA14CHE3/73 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 SA14CHE3/73 meets industry standards.
7.What is the process for return or replacement of SA14CHE3/73?
All SA14CHE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA14CHE3/73, 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 SA14CHE3/73 part is unused and in its original packaging.
Return procedure for SA14CHE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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