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Microchip Technology 1N5373AE3/TR12
- Part No.:
- 1N5373AE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5373AE3/TR12.pdf
- Description:
- DIODE ZENER 68V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:3,848
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Product details
Overview
1N5373AE3/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal zener voltage of 68 V, ±10% tolerance (A suffix), 20 mA test current, 44 Ω maximum dynamic impedance at IZT, and 500 mA maximum zener current (IZM) when adequately heat-sunk. It regulates voltage in power supply reference and overvoltage protection circuits across industrial and telecom systems.
For engineers reviewing the 1N5373AE3/TR12 datasheet, 1N5373AE3/TR12 pinout, 1N5373AE3/TR12 application, or 1N5373AE3/TR12 equivalent, key selection criteria include verified 68 V regulation tolerance, thermal resistance of 25 °C/W (junction-to-lead), RoHS-compliant matte-tin plating, and T-18 axial package compatibility with through-hole PCB assembly.
Technical Context
This device operates as a precision voltage reference in reverse-biased mode, with cathode indicated by a band and rated for -65 °C to +150 °C operating temperature. Its 25 °C/W junction-to-lead thermal resistance enables stable 5 W dissipation at TL < 25 °C with 3/8″ lead length from body.
Electrical behavior is defined at 25 °C with 40 ±10 ms DC current application; dynamic impedance (ZZ) is measured using 1 kHz AC modulation at 10% of IZT. Voltage regulation (ΔVZ = 2.0 V) reflects difference between measurements at 10% and 50% of IZM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±10% - defines regulated output voltage under specified test conditions; actual range: 61.2 V to 74.8 V |
| Test Current (IZT) | 20 mA - DC current at which VZ is measured; establishes baseline operating point for regulation accuracy |
| Max Dynamic Impedance (ZZ) | 44 Ω - limits voltage variation under changing load current; critical for low-noise reference stability |
| Max Reverse Current (IR) | 0.5 μA @ VR = 51 V - ensures minimal leakage below knee voltage, preserving efficiency in standby modes |
| Max Zener Current (IZM) | 500 mA - maximum continuous DC current at TL < 25 °C; determines usable power headroom with heatsinking |
| Voltage Regulation (ΔVZ) | 2.0 V - difference between VZ at 10% and 50% of IZM; quantifies regulation linearity across operating range |
| Thermal Resistance (RθJL) | 25 °C/W - junction-to-lead resistance at 3/8″ lead length; enables thermal design for 5 W steady-state operation |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case per JEDEC DO-41 outline; void-free UL94V-0 epoxy body; cathode identified by color band; leads plated with RoHS-compliant matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; reverse-bias polarity requires cathode at higher potential |
| Cathode | Regulated output node | Banded end; held at stable 68 V relative to anode when reverse current ≥ IZT |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures mechanical and electrical interchangeability across 1N5333B–1N5388B series with standardized T-18 footprint |
| RoHS-compliant e3 suffix | Meets EU Directive 2011/65/EU; matte-tin plating eliminates lead while maintaining solderability per MIL-STD-750 Method 2026 |
| Level 1 moisture sensitivity | No dry pack required per IPC/JEDEC J-STD-020B; simplifies handling and eliminates bake-out prior to reflow |
| High surge current rating | 760 A peak (8.3 ms half-sine) - supports transient overvoltage clamping in power rail protection |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD handling in manufacturing environments |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stable 68 V reference in linear regulator feedback loop for telecom DC-DC converters. IC Role / Device Role / Timing Role: Voltage reference element providing precise setpoint for error amplifier comparison. Use Value: Maintains ±10% output regulation across 20–500 mA load range with <2.0 V ΔVZ drift. |
Use Scenario: Clamping circuit protecting downstream 72 V-rated FET gate drivers from input surges. IC Role / Device Role / Timing Role: Shunt overvoltage protector diverting excess current above 68 V threshold. Use Value: Withstands 760 A surge (8.3 ms) without degradation, enabling robust front-end protection. |
| Industrial Sensor Excitation | Test Equipment Calibration |
Use Scenario: Constant-voltage excitation source for 4–20 mA loop-powered pressure transducers requiring 68 V compliance. IC Role / Device Role / Timing Role: Precision shunt regulator establishing fixed bias voltage for sensor bridge circuitry. Use Value: Delivers stable 68 V ±10% with 44 Ω ZZ, minimizing excitation error in high-impedance sensing paths. |
Use Scenario: Traceable voltage standard in benchtop multimeter calibration fixtures. IC Role / Device Role / Timing Role: Primary reference diode in automated calibration system verifying DMM accuracy at 68 V range. Use Value: Validated ±10% tolerance and low ΔVZ ensure repeatable 68 V reference across multiple calibration cycles. |
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 68 V nominal VZ but ±5% tolerance (B suffix); 44 Ω ZZ unchanged; identical IZM and thermal specs | Higher precision needed where tighter regulation is required; same thermal and surge performance | Select 1N5373B when ±5% tolerance is mandatory; otherwise 1N5373AE3/TR12 offers cost-effective 10% tolerance with RoHS compliance |
| 1N5373CE3/TR12 | Same 68 V nominal VZ but ±2% tolerance (C suffix); 44 Ω ZZ unchanged; identical IZM and thermal specs | Used in metrology-grade references where sub-2% voltage accuracy is critical | Choose 1N5373CE3/TR12 only if ±2% tolerance is required; 1N5373AE3/TR12 provides optimal balance of cost, compliance, and industrial-grade accuracy |
Compared with 1N5373B and 1N5373CE3/TR12, the 1N5373AE3/TR12 delivers verified ±10% regulation tolerance at lower unit cost while retaining identical thermal resistance, surge capability, and RoHS compliance-making it ideal for non-critical industrial power rails where tighter tolerances are unnecessary.
Availability
1N5373AE3/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, telecom voltage clamping, and sensor excitation circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N5373AE3/TR12 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 1N53xx series was designed specifically for ruggedized 5 W voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge resilience, and JEDEC-standardized mechanical compatibility.
FAQ
What is the zener voltage tolerance of the 1N5373AE3/TR12?
The 1N5373AE3/TR12 has a nominal zener voltage of 68 V with ±10% tolerance, as indicated by the "A" suffix per Microsemi documentation. This means the actual measured VZ falls between 61.2 V and 74.8 V at 20 mA test current and 25 °C. The e3 suffix confirms RoHS compliance but does not affect voltage tolerance.
Can the 1N5373AE3/TR12 be used without a heatsink?
The 1N5373AE3/TR12 can dissipate up to 1.47 W at 25 °C ambient when mounted on FR4 with specified copper pads, but its full 5 W rating requires lead temperature (TL) maintained below 25 °C-typically achieved with 3/8″ lead length and external heatsinking. Operating at 5 W without thermal management will exceed junction temperature limits.
What does the "TR12" suffix mean in 1N5373AE3/TR12?
The "TR12" suffix indicates tape-and-reel packaging per EIA-296 standard, with 12-inch reel diameter. This format supports automated SMT placement equipment despite the device's axial-leaded T-18 package-enabling high-volume assembly while preserving through-hole mechanical compatibility.
How is the voltage regulation (ΔVZ) of 2.0 V measured for the 1N5373AE3/TR12?
For the 1N5373AE3/TR12, ΔVZ = 2.0 V is the difference between zener voltage measured at 10% (50 mA) and 50% (250 mA) of IZM (500 mA), per Microsemi Note 4. This metric quantifies regulation linearity across the usable current range and is distinct from dynamic impedance (ZZ = 44 Ω).
Is the 1N5373AE3/TR12 suitable for surge protection applications?
Yes-the 1N5373AE3/TR12 is rated for 760 A peak surge current (8.3 ms half-sine wave), making it suitable for transient voltage suppression in DC power rails. Its low ΔVZ (2.0 V) and high IZM (500 mA) support reliable clamping without thermal runaway when properly heatsunk.
1N5373AE3/TR12 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/TR12 FAQ
1.How can I place an order for 1N5373AE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5373AE3/TR12 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/TR12 reliable?
The price and inventory of 1N5373AE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5373AE3/TR12 is usually 5 days.
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Once your 1N5373AE3/TR12 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/TR12?
For technical support, including 1N5373AE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5373AE3/TR12 requirements.
6.How does Aetrix verify that 1N5373AE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5373AE3/TR12 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/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5373AE3/TR12?
All 1N5373AE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5373AE3/TR12, 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/TR12 part is unused and in its original packaging.
Return procedure for 1N5373AE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5373AE3/TR12 Tags
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