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Microchip Technology 1N5373/TR8
- Part No.:
- 1N5373/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5373/TR8.pdf
- Description:
- DIODE ZENER 68V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:7,236
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Product details
Overview
1N5373/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 68 V, ±5% tolerance (B suffix), 20 mA test current, 44 Ω dynamic impedance at IZT, and 0.5 μA maximum reverse leakage at 51.7 V. It operates from –65°C to +150°C and is used for precision voltage reference and overvoltage protection in industrial power supplies.
For engineers reviewing the 1N5373/TR8 datasheet, 1N5373/TR8 pinout, 1N5373/TR8 application, or 1N5373/TR8 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (500 A), voltage regulation (ΔVZ = 2.0 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This discrete Zener diode functions as a two-terminal voltage regulator in reverse-bias mode, maintaining stable output voltage across wide current variation (IZM = 500 mA at TL = 25°C). Its low dynamic impedance (44 Ω) and tight ±5% tolerance ensure minimal voltage drift under load changes.
Designed for axial-lead mounting on FR4 PCBs or with 10 mm lead length from body, it delivers 5.0 W steady-state dissipation at lead temperature <25°C, derating linearly above that point. Thermal resistance is 25 °C/W junction-to-lead and 85 °C/W junction-to-ambient under defined PCB conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±5% - precise regulation point for 68 V reference circuits |
| Test Current (IZT) | 20 mA - operating point where VZ and ZZ are specified |
| Dynamic Impedance (ZZ) | 44 Ω at IZT - low AC resistance ensures stable voltage under varying load |
| Max Reverse Leakage (IR) | 0.5 μA at 51.7 V - negligible standby current in high-impedance bias networks |
| Max Regulator Current (IZM) | 500 mA - maximum DC current before thermal runaway with adequate heatsinking |
| Voltage Regulation (ΔVZ) | 2.0 V - difference between VZ measured at 10% and 50% of IZM |
| Surge Current (IZSM) | 500 A (8.3 ms half-sine) - withstands transient overvoltage events without failure |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables reliable 5 W operation with 3/8″ lead length |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by band; leads plated with RoHS-compliant annealed matte tin 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 when reverse-biased above knee voltage |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures standardized mechanical dimensions and electrical behavior across global supply chain |
| Moisture sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out prior to assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Robust handling in manufacturing without special static control beyond standard practices |
| RoHS-compliant (e3 suffix) | Meets EU Directive 2011/65/EU with matte-tin plating and halogen-free epoxy |
| High surge current capability | 500 A peak (8.3 ms) supports transient suppression in unprotected input stages |
Applications
| Industrial Power Supply Reference | Overvoltage Clamp for DC Bus |
|---|---|
Use Scenario: Stable 68 V reference in isolated flyback feedback loop for 48 V telecom rectifier. IC Role / Device Role / Timing Role: Zener diode providing precise voltage threshold for optocoupler biasing and error amplifier reference. Use Value: ±5% tolerance and 2.0 V ΔVZ ensure consistent regulation across line/load/temperature, minimizing output deviation. | Use Scenario: Protection clamp on 60 V DC bus against load dump transients in factory automation controller. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing excess energy during voltage spikes. Use Value: 500 A surge rating and 5 W continuous dissipation enable reliable clamping without degradation after repeated 8.3 ms surges. |
| Programmable Logic Controller Input Protection | Test Equipment Voltage Calibration Standard |
Use Scenario: Input stage protection for 24–72 V digital input module subjected to field wiring faults. IC Role / Device Role / Timing Role: Primary overvoltage limiter placed ahead of TVS and series resistor. Use Value: Low 0.5 μA leakage at 51.7 V prevents false triggering while 44 Ω ZZ ensures fast response to overvoltage events. | Use Scenario: Bench-level calibration reference for multimeters and source-measure units requiring traceable 68 V standard. IC Role / Device Role / Timing Role: Precision Zener element in temperature-compensated reference subcircuit. Use Value: Tight ±5% tolerance and minimal ΔVZ support repeatable 68 V output across 0–50°C ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5373B | Same Zener voltage (68 V), ±5% tolerance, identical package and ratings; TR8 denotes tape-and-reel packaging variant | No functional difference - TR8 indicates EIA-296 compliant tape-and-reel delivery; same electrical and thermal specs | Select 1N5373/TR8 for automated SMT placement; choose 1N5373B for bulk or ammo-pack manual assembly |
| MMBZ5255B (ON Semiconductor) | Surface-mount SOD-123 package, 68 V ±5%, but rated only at 0.5 W - not a power-equivalent replacement | Only suitable for low-power bias/reference use; cannot replace 1N5373/TR8 in 5 W dissipation roles | Use MMBZ5255B only in space-constrained, low-current applications; avoid where >100 mA average current or surge immunity is required |
Compared with 1N5373/TR8, the 1N5373B offers identical performance in different packaging, while MMBZ5255B provides surface-mount convenience at severe power and surge capability trade-offs - neither is a drop-in replacement for high-power regulation.
Availability
1N5373/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, programmable logic controller input protection, and test equipment voltage calibration requiring stable component supply and full RoHS compliance.
Supply support for 1N5373/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 series was designed specifically for ruggedized 5 W Zener regulation in harsh-environment power systems, emphasizing thermal robustness, surge resilience, and long-term stability under extended temperature cycling.
FAQ
What is the Zener voltage tolerance of the 1N5373/TR8?
The 1N5373/TR8 has a nominal Zener voltage of 68 V with ±5% tolerance, as indicated by the "B" suffix in its full designation. This means the actual measured VZ falls between 64.6 V and 71.4 V at 20 mA test current and 25°C lead temperature. The tolerance is guaranteed per JEDEC specification and verified during 100% testing.
Does the 1N5373/TR8 require dry packing due to moisture sensitivity?
No, the 1N5373/TR8 has IPC/JEDEC J-STD-020B moisture sensitivity level 1, meaning it is not moisture-sensitive and does not require dry packing or baking before PCB assembly. Its void-free thermosetting epoxy body and matte-tin plating ensure robust handling in standard manufacturing environments.
What is the maximum continuous power dissipation for the 1N5373/TR8 on a standard FR4 board?
When mounted on a standard FR4 PCB (1 oz copper, 4 mm² pads, 1 mm track width, 25 mm length), the 1N5373/TR8 is rated for 1.47 W steady-state power at 25°C ambient temperature. This is derived from its 85 °C/W junction-to-ambient thermal resistance and must be derated linearly above 25°C ambient per Figure 1 in the datasheet.
Can the 1N5373/TR8 be used as a direct replacement for the 1N5373B?
Yes - the 1N5373/TR8 is functionally identical to the 1N5373B in all electrical, thermal, and mechanical specifications. The "TR8" suffix denotes EIA-296 compliant tape-and-reel packaging for automated placement; no design or layout changes are needed when substituting 1N5373/TR8 for 1N5373B in existing assemblies.
What is the surge current rating of the 1N5373/TR8 and how is it defined?
The 1N5373/TR8 has a maximum non-recurrent surge current (IZSM) of 500 A, defined as the peak value of a single 8.3 ms half-sine waveform. This rating reflects its ability to absorb transient energy without parametric shift or catastrophic failure, making it suitable for input-stage clamping in industrial power systems exposed to load dump or inductive switching events.
1N5373/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:
- ±20%
- 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
1N5373/TR8 FAQ
1.How can I place an order for 1N5373/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5373/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 1N5373/TR8 reliable?
The price and inventory of 1N5373/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5373/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5373/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5373/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5373/TR8?
1N5373/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5373/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 1N5373/TR8?
For technical support, including 1N5373/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5373/TR8 requirements.
6.How does Aetrix verify that 1N5373/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5373/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 1N5373/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5373/TR8?
All 1N5373/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5373/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 1N5373/TR8 part is unused and in its original packaging.
Return procedure for 1N5373/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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