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Microchip Technology 1N5373AE3/TR8
- Part No.:
- 1N5373AE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5373AE3/TR8.pdf
- Description:
- DIODE ZENER 68V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,667
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Product details
Overview
1N5373AE3/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 68 V, ±10% tolerance (A suffix), 20 mA test current, 44 Ω maximum dynamic impedance at IZT, and 500 mA maximum surge current. 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 1N5373AE3/TR8 datasheet, 1N5373AE3/TR8 pinout, 1N5373AE3/TR8 application, or 1N5373AE3/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), steady-state power rating (5 W at TL < 25 °C), reverse leakage (≤0.5 μA at 51.0 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown mode. Its Zener voltage is specified at 25 °C with 40 ±10 ms measurement delay after DC current application, and its dynamic impedance is measured using 1 kHz AC modulation equal to 10% of IZT.
Voltage regulation (ΔVZ) is defined as the difference between voltages measured at 10% and 50% of IZM (72 mA), yielding a maximum ΔVZ of 2.0 V. The device exhibits minimal voltage drift versus current due to low ZZ and supports high surge stress (8.3 ms half-sine wave) up to 500 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±10% - defines stable regulation point under reverse bias at 20 mA test current |
| Power Dissipation | 5.0 W at TL < 25 °C - requires 3/8″ lead length heat sinking for full rating |
| Dynamic Impedance (ZZ) | 44 Ω max at IZT = 20 mA - ensures low voltage variation across operating current range |
| Reverse Leakage Current | ≤0.5 μA at VR = 51.0 V - guarantees low standby power loss in regulation circuits |
| Surge Current (IZSM) | 500 mA peak (8.3 ms half-sine) - withstands transient overvoltage events without failure |
| Thermal Resistance | 25 °C/W junction-to-lead - enables predictable thermal design with standard axial mounting |
| Operating Temperature | –65 °C to +150 °C - supports deployment in harsh industrial and automotive under-hood environments |
Pinout & Package
Package: Axial-leaded T-18 plastic encapsulated case per JEDEC DO-204AL. Cathode indicated by band; banded end must be biased positive relative to anode for Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference node for reverse-bias connection | Connected to lower-potential side of circuit; forms cathode-anode voltage drop defining VZ |
| Cathode | Zener breakdown terminal | Banded end; connected to higher-potential side; voltage referenced to anode during regulation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Ensures standardized mechanical dimensions, marking, and reliability testing compliance across suppliers |
| Moisture sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out prior to assembly |
| RoHS-compliant e3 suffix | Matte-tin plating meets EU RoHS Directive 2011/65/EU and J-STD-609A Class 1 |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - no special ESD handling needed during board assembly |
| High surge current capability | 500 mA non-recurrent 8.3 ms half-sine - protects downstream circuitry from line transients |
Applications
| Industrial Power Supply Regulation | Automotive ECU Reference |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback converters delivering 24 V output. IC Role / Device Role / Timing Role: Zener reference element in optocoupler feedback loop, setting precise secondary-side regulation threshold. Use Value: Maintains ±10% output accuracy over –40 °C to +105 °C ambient with ≤2.0 V regulation delta across load steps. | Use Scenario: Providing stable 68 V clamp for microcontroller reset supervisor ICs in engine control units. IC Role / Device Role / Timing Role: Overvoltage protection clamp limiting supply rail excursions during load dump events. Use Value: Absorbs 500 mA surge energy without degradation, preserving reset logic integrity during ISO 7637-2 Pulse 5a transients. |
| Test Equipment Voltage Standard | Telecom Line Interface Protection |
Use Scenario: Serving as primary voltage reference in portable multimeter front-end calibration circuits. IC Role / Device Role / Timing Role: Precision DC reference source for ADC reference divider networks. Use Value: Delivers 68 V ±10% stability over 1000-hour life with <0.5 μA leakage ensuring low input bias error. | Use Scenario: Protecting Ethernet PHY interface ICs from induced surges on outdoor copper lines. IC Role / Device Role / Timing Role: Secondary-stage clamping device following gas discharge tube (GDT) primary protection. Use Value: Activates at 68 V to limit residual voltage to safe levels (<100 V) for 100BASE-TX transceivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5373B | ±5% tolerance (B suffix) vs. ±10% (A suffix); otherwise identical electrical specs and package | Higher voltage precision required in metrology-grade references where tighter regulation is critical | Select 1N5373B when ±5% VZ tolerance is mandatory; same thermal and surge performance as 1N5373AE3/TR8 |
| MMBZ5255BS-7-F | Surface-mount SOD-123 package (2.7 × 1.6 mm), 200 mW rating, 68 V ±5%, 100 Ω ZZ | Space-constrained PCBs where axial leads are incompatible with automated placement or height restrictions | Choose MMBZ5255BS-7-F only for low-power signal-level clamping; not suitable for 5 W dissipation or surge absorption |
Compared with 1N5373B and MMBZ5255BS-7-F, the 1N5373AE3/TR8 provides optimal balance of high-power handling (5 W), robust surge immunity (500 mA), and cost-effective axial packaging-making it preferred for industrial power rails and legacy designs requiring through-hole assembly.
Availability
1N5373AE3/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, test equipment calibration circuits, and telecom line interface protection requiring stable component supply and long-term obsolescence management.
Supply support for 1N5373AE3/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xx series was designed specifically for high-stability, high-surge industrial voltage regulation-emphasizing rugged axial packaging, wide temperature operation, and JEDEC-standardized interchangeability.
FAQ
What is the Zener voltage tolerance for 1N5373AE3/TR8?
The 1N5373AE3/TR8 has a Zener voltage tolerance of ±10%, indicated by the "A" suffix in the part number. Its nominal regulation voltage is 68 V, meaning the actual VZ falls between 61.2 V and 74.8 V at 20 mA test current and 25 °C. This tolerance is verified per JEDEC Registered Data and applies across the full operating temperature range.
Does 1N5373AE3/TR8 require dry packing before soldering?
No, the 1N5373AE3/TR8 does not require dry packing. It carries IPC/JEDEC J-STD-020B moisture sensitivity Level 1 classification, meaning it can be stored indefinitely at ambient conditions without baking. The device uses void-free transfer-molded epoxy packaging that prevents moisture ingress during reflow soldering at 260 °C for 10 seconds.
What is the maximum surge current rating for 1N5373AE3/TR8?
The 1N5373AE3/TR8 is rated for a maximum non-recurrent surge current (IZSM) of 500 mA. This value corresponds to a single 8.3 ms half-sine waveform, as defined in Microsemi's datasheet. The device maintains regulation integrity and parametric stability after such events when mounted with proper lead-length thermal relief.
How is polarity marked on the 1N5373AE3/TR8 package?
The 1N5373AE3/TR8 uses a cathode band for polarity identification. The banded end is the cathode and must be connected to the higher-potential node in the circuit for proper Zener operation. When forward biased, the device behaves as a standard silicon diode with ≤1.2 V forward voltage at 1.0 A, but its intended function is reverse-bias regulation.
Is 1N5373AE3/TR8 RoHS compliant?
Yes, the "e3" suffix in 1N5373AE3/TR8 explicitly denotes RoHS compliance. It features annealed matte-tin plating on leads, meeting EU Directive 2011/65/EU and J-STD-609A Class 1 requirements. The epoxy body is UL94V-0 rated, and all materials are fully documented for restricted substance compliance.
1N5373AE3/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:
- ±10%
- 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
1N5373AE3/TR8 FAQ
1.How can I place an order for 1N5373AE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5373AE3/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 1N5373AE3/TR8 reliable?
The price and inventory of 1N5373AE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5373AE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5373AE3/TR8?
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1N5373AE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5373AE3/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 1N5373AE3/TR8?
For technical support, including 1N5373AE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5373AE3/TR8 requirements.
6.How does Aetrix verify that 1N5373AE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5373AE3/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 1N5373AE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5373AE3/TR8?
All 1N5373AE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5373AE3/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 1N5373AE3/TR8 part is unused and in its original packaging.
Return procedure for 1N5373AE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5373AE3/TR8 Tags
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