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Microchip Technology 1N5373C/TR8
- Part No.:
- 1N5373C/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5373C/TR8.pdf
- Description:
- DIODE ZENER 68V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:5,220
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Product details
Overview
1N5373C/TR8 from Microsemi is a 5 W, 68 V ±2% axial-leaded silicon Zener diode designed for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation. It delivers stable regulation at 20 mA test current with 44 Ω dynamic impedance, operates from –65°C to +150°C, and supports up to 500 mA maximum surge current.
For engineers reviewing the 1N5373C/TR8 datasheet, 1N5373C/TR8 pinout, 1N5373C/TR8 application, or 1N5373C/TR8 equivalent, key selection criteria include its ±2% tolerance (C suffix), 68 V nominal Zener voltage, 5 W steady-state power rating at lead temperature <25°C, low 2.0 V voltage regulation (ΔVZ), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage reference operating in reverse breakdown. Its regulation performance is defined at 20 mA (IZT), with dynamic impedance measured at 1 kHz AC superimposed on DC bias, and voltage regulation (ΔVZ) specified as the difference between voltages at 10% and 50% of IZM.
The 1N5373C/TR8 exhibits 44 Ω maximum dynamic impedance (ZZ) and 70 Ω maximum knee impedance (ZZK) at 1.0 mA, enabling stable reference behavior across varying load currents. Its thermal resistance is 25 °C/W junction-to-lead (3/8" lead length), supporting high-current operation with appropriate heat sinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±2% - precise reference voltage with tight tolerance for feedback and protection circuits |
| Test Current (IZT) | 20 mA - standardized bias point for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 44 Ω max - low AC resistance ensures minimal output voltage variation under changing load |
| Max Surge Current (IZSM) | 500 A - withstands non-repetitive 8.3 ms half-sine transients without failure |
| Voltage Regulation (ΔVZ) | 2.0 V - small difference between voltages at 10% and 50% of IZM confirms stable regulation |
| Power Dissipation (Pd) | 5.0 W at TL < 25°C - requires thermal management when operated near full rating |
| Reverse Current (IR) | 0.5 μA max at VR = 51.7 V - ultra-low leakage preserves accuracy in high-impedance nodes |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; reverse-biased operation requires cathode at higher potential |
| Cathode | Regulated output node | Banded end; held at stable 68 V relative to anode during breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables accurate voltage references without post-manufacture trimming in mid-precision applications |
| 5 W power rating with 25 °C/W junction-to-lead thermal resistance | Supports robust regulation in industrial power supplies with minimal heatsinking at lead mount |
| Moisture sensitivity Level 1 (IPC/JEDEC J-STD-020B) | Eliminates dry-pack requirement and floor-life constraints for SMT assembly planning |
| Nonsensitive to ESD per MIL-STD-750 Method 1020 | Reduces handling precautions and eliminates need for ESD-protected workstations in production |
| RoHS-compliant (e3 suffix) and MIL-PRF-19500 screening options | Meets environmental compliance and enables drop-in use in defense/aerospace programs with MQ/MX/MV prefixes |
Applications
| Switching Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in the optocoupler feedback path of isolated DC-DC converters to regulate output voltage within ±2%. IC Role / Device Role / Timing Role: Precision voltage reference establishing error threshold for PWM controller shutdown. Use Value: Tight 68 V tolerance and low ΔVZ ensure consistent regulation across line/load/temperature variations. | Use Scenario: Placed across sensitive input rails (e.g., microcontroller VDD) to clamp transient spikes above 68 V. IC Role / Device Role / Timing Role: Passive crowbar element conducting only during overvoltage events. Use Value: 500 A surge rating and low ZZ allow rapid clamping without thermal runaway under 8.3 ms surges. |
| Programmable Reference Generator | Industrial Sensor Excitation |
Use Scenario: Paired with resistive dividers to generate stable sub-68 V references (e.g., 3.3 V, 5 V) via scaling. IC Role / Device Role / Timing Role: Primary voltage source for resistor-based reference networks. Use Value: Low IR (0.5 μA) minimizes divider current error; ±2% VZ ensures initial accuracy before trimming. | Use Scenario: Supplies constant excitation voltage to bridge-based pressure/strain sensors in harsh environments. IC Role / Device Role / Timing Role: Stable bias source maintaining sensor output linearity and repeatability. Use Value: Wide –65°C to +150°C operating range and low ΔVZ preserve calibration stability across thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5373B/TR8 | ±5% tolerance (B suffix) vs. ±2% (C); identical VZ, IZT, ZZ, and package | Suitable where tighter regulation not required; lower cost for less critical references | Select 1N5373B/TR8 if system-level tolerance budget allows ±5% drift in reference voltage |
| MMSZ5259ET1G | Surface-mount SOD-123 package; 68 V ±5%, 500 mW rating; 30 Ω ZZ | Not interchangeable due to 10× lower power rating and different mounting; used in space-constrained low-power designs | Choose MMSZ5259ET1G only for PCB area-limited applications where 500 mW suffices and axial leads are prohibited |
Compared with 1N5373B/TR8, the 1N5373C/TR8 provides improved reference accuracy but same thermal and surge capability; versus MMSZ5259ET1G, it offers 10× higher power handling and axial-mount flexibility but requires more board space and different layout.
Availability
1N5373C/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and precision reference generator designs requiring stable component supply and long-term manufacturability.
Supply support for 1N5373C/TR8 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
The 1N53xxB/C series belongs to Microsemi's legacy axial-leaded Zener diode product line, engineered for ruggedized voltage regulation in mission-critical power systems where thermal stability and surge resilience are essential.
FAQ
What is the Zener voltage tolerance of the 1N5373C/TR8?
The 1N5373C/TR8 has a Zener voltage tolerance of ±2%, indicated by the "C" suffix in its part number. This means its nominal 68 V Zener voltage falls within the range of 66.64 V to 69.36 V at 20 mA test current and 25°C. This tighter tolerance supports higher-accuracy voltage references compared to the ±5% 1N5373B/TR8 variant.
What is the maximum continuous power dissipation for the 1N5373C/TR8?
The 1N5373C/TR8 is rated for 5.0 W steady-state power dissipation when lead temperature (TL) is maintained below 25°C, typically achieved with ≥10 mm lead length from the body. On FR4 PCB with standard copper pads, its derated power drops to 1.47 W at 25°C ambient, per its 85°C/W junction-to-ambient thermal resistance specification.
Does the 1N5373C/TR8 require dry packing for moisture sensitivity?
No, the 1N5373C/TR8 has IPC/JEDEC J-STD-020B moisture sensitivity Level 1, meaning it is not moisture-sensitive and does not require dry packing or floor-life controls prior to soldering. Its void-free thermosetting epoxy package inherently prevents moisture ingress during reflow or wave soldering processes.
What is the reverse leakage current specification for the 1N5373C/TR8?
The 1N5373C/TR8 specifies a maximum reverse leakage current (IR) of 0.5 μA when tested at 51.7 V (VR = 0.76 × VZ). This ultra-low leakage ensures minimal current draw in high-impedance reference networks and preserves accuracy in battery-powered or low-quiescent-current applications.
Is the 1N5373C/TR8 RoHS compliant?
Yes, the 1N5373C/TR8 is RoHS compliant, as confirmed by the "e3" suffix in its full manufacturer designation (1N5373C/TR8 e3). Its leads feature annealed matte-tin plating that meets RoHS requirements and is solderable per MIL-STD-750 Method 2026, supporting both lead-free and SnPb assembly processes.
1N5373C/TR8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 68 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 44 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 49 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 1 A
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- T-18
1N5373C/TR8 FAQ
1.How can I place an order for 1N5373C/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5373C/TR8 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 1N5373C/TR8 reliable?
The price and inventory of 1N5373C/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5373C/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5373C/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5373C/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5373C/TR8?
1N5373C/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5373C/TR8 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 1N5373C/TR8?
For technical support, including 1N5373C/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5373C/TR8 requirements.
6.How does Aetrix verify that 1N5373C/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5373C/TR8 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 1N5373C/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5373C/TR8?
All 1N5373C/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5373C/TR8, 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 1N5373C/TR8 part is unused and in its original packaging.
Return procedure for 1N5373C/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5373C/TR8 Tags
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BZT52C5V6T-7
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BZX84C3V3LT1G
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MMSZ4682T1G
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MM5Z5V1ST1G
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