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Microchip Technology 1N5373E3/TR12
- Part No.:
- 1N5373E3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5373E3/TR12.pdf
- Description:
- DIODE ZENER 68V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,007
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Product details
Overview
1N5373E3/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 68 V, ±5% tolerance (B-suffix equivalent), 20 mA test current, 44 Ω dynamic impedance at IZT, and 500 mA maximum Zener current (IZM). 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 1N5373E3/TR12 datasheet, 1N5373E3/TR12 pinout, 1N5373E3/TR12 application, or 1N5373E3/TR12 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 device functions as a two-terminal voltage regulator operating in reverse-biased breakdown mode. Its Zener voltage is specified at 25 °C lead temperature with 40 ±10 ms DC measurement delay, and its dynamic impedance (ZZ) is measured using 1 kHz AC modulation at 10% of IZT.
Thermal performance is defined for two mounting conditions: 25 °C/W junction-to-lead at 10 mm lead length, and 85 °C/W junction-to-ambient on FR4 with 4 mm² copper pads. The cathode is marked by a band, and operation requires the banded end to be positive relative to the anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V nominal, ±5% tolerance - defines stable regulation point under specified IZT and thermal conditions. |
| Test Current (IZT) | 20 mA - current at which VZ is guaranteed; sets minimum operating current for regulation. |
| Dynamic Impedance (ZZ) | 44 Ω at IZT - determines output voltage variation under load current changes. |
| Max Zener Current (IZM) | 500 mA - maximum continuous DC current before exceeding 5 W power limit at TL = 25 °C. |
| Surge Current (IZSM) | 500 A peak (8.3 ms half-sine) - supports transient overvoltage clamping without failure. |
| Voltage Regulation (ΔVZ) | 2.0 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity. |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables thermal design with heatsinking via leads; critical for sustained 5 W operation. |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by colored band. Leads are annealed matte-tin plated (RoHS compliant), solderable per MIL-STD-750 Method 2026. Weight: 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to circuit ground or lower potential node; reverse bias applied across anode–cathode to enable regulation. |
| Cathode | Zener breakdown terminal | Banded end; connected to regulated voltage rail; must be held at higher potential than anode to activate Zener conduction. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 5 W Zener | Guaranteed power handling up to 5 W with validated thermal derating curves and mounting guidelines. |
| Moisture Sensitivity Level 1 | No dry pack required - simplifies SMT reflow prep and eliminates bake steps for board assembly. |
| ESD robustness | Nonsensitive per MIL-STD-750 Method 1020 - withstands handling without special ESD controls. |
| High surge current capability | 500 A non-recurrent surge (8.3 ms) - provides reliable transient suppression in power rails. |
| Stable regulation over temperature | –65 °C to +150 °C operating range - suitable for under-hood automotive and industrial environments. |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing reference voltage for feedback loops in 48 V telecom rectifiers and programmable DC supplies. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference providing stable 68 V setpoint for error amplifiers and PWM controllers. Use Value: Maintains ±5% output accuracy across –40 °C to +85 °C ambient with <2.0 V regulation delta over 50–100% load step. |
Use Scenario: Clamping induced transients on 60 V battery management system (BMS) input lines during load dump. IC Role / Device Role / Timing Role: Standby shunt protector activated only during overvoltage events exceeding 68 V threshold. Use Value: Absorbs 500 A surge (8.3 ms) without degradation, preventing downstream IC damage while drawing zero quiescent current in normal operation. |
| Programmable Voltage Reference | DC-DC Converter Feedback Divider |
Use Scenario: Generating precise 68 V reference for calibration equipment and high-voltage sensor excitation circuits. IC Role / Device Role / Timing Role: Primary voltage standard in metrology-grade analog front ends requiring low drift and tight tolerance. Use Value: Delivers ±5% initial accuracy and <44 Ω dynamic impedance - enabling sub-0.5% total error in closed-loop reference designs. |
Use Scenario: Setting output voltage in isolated flyback converters where secondary-side regulation uses optocoupler feedback. IC Role / Device Role / Timing Role: Zener-based reference replacing TL431 in cost-sensitive, high-isolation applications. Use Value: Supports 20 mA test current and 500 mA max current - allows direct drive of optocoupler LED without external transistor buffering. |
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, ±5%, 5 W rating but with SnPb plating and no e3 RoHS suffix; identical electrical specs and T-18 package. | Not RoHS-compliant; unsuitable for lead-free manufacturing or EU/China RoHS-regulated products. | Select 1N5373B only for legacy SnPb assembly or when RoHS compliance is not required. |
| SMBJ5373B | Surface-mount SMB package (JEDEC DO-214AA); same 68 V, ±5%, 5 W rating but higher thermal resistance (junction-to-ambient ≈ 100 °C/W). | Requires PCB layout change; lacks axial leads for through-hole prototyping or high-surge chassis grounding paths. | Choose SMBJ5373B only for space-constrained SMT designs where board real estate outweighs thermal and mechanical trade-offs. |
Compared with 1N5373B and SMBJ5373B, the 1N5373E3/TR12 uniquely combines RoHS compliance, axial-leaded mechanical robustness, and 25 °C/W junction-to-lead thermal resistance - making it optimal for production-grade through-hole power regulation where regulatory compliance and thermal reliability are jointly critical.
Availability
1N5373E3/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, programmable voltage references, and DC-DC converter feedback networks requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N5373E3/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, RF, and power management 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 stability, surge resilience, and JEDEC-standardized mechanical form factor.
FAQ
What is the Zener voltage tolerance of the 1N5373E3/TR12?
The 1N5373E3/TR12 has a ±5% Zener voltage tolerance, confirmed by its "B" suffix in the base part number (1N5373B) and retained in the RoHS-compliant e3 variant. This means the actual VZ falls between 64.6 V and 71.4 V at 20 mA and 25 °C lead temperature, as verified in the official Microsemi datasheet revision D.
Does the 1N5373E3/TR12 require a heatsink for 5 W operation?
Yes - the 1N5373E3/TR12 achieves its full 5 W rating only when mounted with 10 mm lead length from the body, achieving 25 °C/W junction-to-lead thermal resistance. Without adequate heatsinking or lead thermal path, power dissipation must be derated per Figure 1 in the datasheet to avoid exceeding 150 °C junction temperature.
Is the 1N5373E3/TR12 compatible with lead-free reflow processes?
Yes - the 1N5373E3/TR12 features RoHS-compliant annealed matte-tin plating and is rated for 260 °C for 10 seconds, meeting J-STD-020 requirements for lead-free soldering. Its moisture sensitivity level is IPC/JEDEC Level 1, eliminating the need for dry packing or baking prior to assembly.
What is the maximum surge current rating for the 1N5373E3/TR12?
The 1N5373E3/TR12 is rated for 500 A peak non-recurrent surge current (IZSM) in an 8.3 ms half-sine waveform, as specified in the Electrical Characteristics table. This value is validated per JEDEC standards and reflects its capability to clamp high-energy transients without parametric shift or failure.
How does the voltage regulation (ΔVZ) specification apply to the 1N5373E3/TR12?
The 1N5373E3/TR12 has a maximum voltage regulation (ΔVZ) of 2.0 V, defined as the difference between Zener voltage measured at 10% and 50% of IZM (i.e., 50 mA and 250 mA). This quantifies its ability to maintain stable output under varying load currents and directly impacts regulation accuracy in feedback and reference applications.
1N5373E3/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:
- ±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
1N5373E3/TR12 FAQ
1.How can I place an order for 1N5373E3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5373E3/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 1N5373E3/TR12 reliable?
The price and inventory of 1N5373E3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5373E3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5373E3/TR12?
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1N5373E3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5373E3/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 1N5373E3/TR12?
For technical support, including 1N5373E3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5373E3/TR12 requirements.
6.How does Aetrix verify that 1N5373E3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5373E3/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 1N5373E3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5373E3/TR12?
All 1N5373E3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5373E3/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 1N5373E3/TR12 part is unused and in its original packaging.
Return procedure for 1N5373E3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5373E3/TR12 Tags
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