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Microchip Technology 1N5373A/TR12
- Part No.:
- 1N5373A/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5373A/TR12.pdf
- Description:
- DIODE ZENER 68V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:9,745
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Product details
Overview
1N5373A/TR12 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, and 44 Ω maximum dynamic impedance at IZT. 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 1N5373A/TR12 datasheet, 1N5373A/TR12 pinout, 1N5373A/TR12 application, or 1N5373A/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (500 A), regulation stability (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 shunt voltage regulator, maintaining stable reverse-bias voltage across its cathode–anode terminals under varying load and line conditions. Its low 25 °C/W junction-to-lead thermal resistance enables operation at full 5 W dissipation with minimal lead-length heat sinking (3/8″ from body).
It exhibits 0.5 μA maximum reverse leakage at 51.7 V (VR = 0.75 × VZ), 2.0 V voltage regulation (ΔVZ) between 10% and 50% of IZM, and 500 A non-repetitive surge current capability for 8.3 ms half-sine transients - critical for transient suppression in DC bus lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±10% - defines regulated output voltage under 20 mA test current; high-voltage rail stabilization |
| Power Dissipation (PD) | 5.0 W at TL = 25 °C - supports continuous regulation in compact heatsink-free designs with adequate lead length |
| Dynamic Impedance (ZZ) | 44 Ω max at IZT = 20 mA - ensures tight voltage control under small-signal AC ripple superimposed on DC bias |
| Surge Current (IZSM) | 500 A peak (8.3 ms half-sine) - provides robust transient clamping without failure in industrial surge environments |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - allows direct thermal path to PCB copper or chassis via 3/8″ lead length |
| Reverse Leakage (IR) | 0.5 μA max at VR = 51.7 V - guarantees low standby power loss in high-impedance reference circuits |
| Voltage Regulation (ΔVZ) | 2.0 V - quantifies deviation between voltages measured at 10% and 50% of max Zener current (IZM) |
Pinout & Package
Package: Axial-leaded T-18 plastic case (Void-free UL94V-0 epoxy), cathode indicated by band; leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026; weight 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to positive side of load; sinks current to maintain fixed voltage drop across device |
| Anode (non-banded end) | Reference ground node | Connected to circuit common; completes shunt path for excess current during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N53xx series | Industry-standard footprint and electrical behavior - ensures supply chain compatibility and design reuse |
| Moisture Sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out before assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Robust handling in manufacturing - no special ESD controls needed during placement or testing |
| RoHS-compliant (e3 suffix) | Lead-free matte-tin plating - meets global environmental compliance without sacrificing solderability |
| Tape-and-reel packaging (TR12) | 12 mm tape width, EIA-296 compliant - enables automated SMT-compatible axial insertion or manual reel-fed assembly |
Applications
| Industrial Power Supply Reference | DC Bus Overvoltage Clamp |
|---|---|
Use Scenario: Stable 68 V reference for feedback loop in 72 V nominal telecom rectifier. IC Role / Device Role / Timing Role: Shunt voltage reference providing error signal to PWM controller. Use Value: ±10% tolerance and 2.0 V regulation ensure consistent setpoint accuracy across temperature and aging. | Use Scenario: Protection of 60 V DC traction bus against regenerative braking spikes. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping bus to ≤75 V during 500 A surges. Use Value: 500 A surge rating and 25 °C/W thermal resistance prevent thermal runaway during repeated 8.3 ms transients. |
| Programmable Logic Controller I/O Protection | Test Equipment Calibration Reference |
Use Scenario: Input stage protection for 60 V-rated analog input channel in PLC module. IC Role / Device Role / Timing Role: Reverse-biased clamp limiting input voltage to safe level during field wiring faults. Use Value: 0.5 μA leakage at 51.7 V minimizes loading on high-impedance sensor signals. | Use Scenario: Fixed 68 V reference in portable multimeter calibration circuit. IC Role / Device Role / Timing Role: Precision shunt regulator establishing traceable voltage standard. Use Value: Low ΔVZ (2.0 V) and 44 Ω ZZ enable repeatable 0.1% measurement accuracy under varying load conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5373B/TR12 | ±5% tolerance (vs. ±10% for 1N5373A/TR12); identical VZ, PD, package, and surge rating | Higher precision required in feedback loops where tighter regulation reduces output variation | Select when system-level voltage accuracy demands < ±5% drift over temperature and life |
| MMBZ5268B-TP | Surface-mount SOD-123 package; 68 V ±5%, 0.5 W rating; 10× lower power than 1N5373A/TR12 | Space-constrained PCBs where 5 W dissipation is not required; unsuitable for high-current clamping | Choose only for low-power reference use with strict board area limits - not a functional replacement for 5 W operation |
Compared with 1N5373B/TR12, the 1N5373A/TR12 trades voltage precision for cost and availability in less demanding regulation tasks; versus MMBZ5268B-TP, it delivers 10× higher power handling and proven surge robustness but requires axial mounting and larger board real estate.
Availability
1N5373A/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, DC bus protection systems, and programmable logic controller I/O modules requiring stable component supply with full JEDEC compliance and RoHS certification.
Supply support for 1N5373A/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 timing solutions for aerospace, defense, and industrial markets.
The 1N53xx series was designed as a ruggedized, high-power axial Zener family for mission-critical voltage regulation and transient suppression where thermal stability and surge resilience are essential.
FAQ
What is the Zener voltage tolerance of the 1N5373A/TR12?
The 1N5373A/TR12 has a nominal Zener voltage of 68 V with ±10% tolerance, as indicated by the "A" suffix per Microsemi's documentation. This means the actual measured VZ falls between 61.2 V and 74.8 V at 20 mA test current and 25 °C lead temperature. The tolerance directly impacts regulation accuracy in feedback networks and must be accounted for in worst-case circuit analysis.
Does the 1N5373A/TR12 require dry packing before PCB assembly?
No, the 1N5373A/TR12 has IPC/JEDEC J-STD-020B moisture sensitivity level 1, meaning it is not hygroscopic and does not require dry packing or baking prior to reflow or hand soldering. This simplifies logistics and eliminates process steps in manufacturing, reducing risk of tombstoning or voiding during lead-free soldering at 260 °C for 10 seconds.
What is the maximum surge current rating for the 1N5373A/TR12?
The 1N5373A/TR12 is rated for 500 A peak non-repetitive surge current (IZSM) under an 8.3 ms half-sine waveform, per Microsemi's datasheet. This rating reflects its ability to absorb transient energy without failure - critical for protecting downstream components in DC power distribution systems exposed to inductive switching or lightning-induced surges.
How is thermal management handled for the 1N5373A/TR12 at full 5 W dissipation?
The 1N5373A/TR12 achieves full 5 W power dissipation with a thermal resistance of 25 °C/W junction-to-lead when mounted with 3/8″ (10 mm) lead length from the epoxy body. This allows direct conduction cooling through the leads into copper pours or chassis mounts - no external heatsink is required if PCB layout provides sufficient copper area and lead length per Microsemi's derating curve in Figure 1.
Is the 1N5373A/TR12 RoHS compliant?
Yes, the 1N5373A/TR12 carries the "e3" suffix in its full ordering designation (as confirmed in Microsemi's REV D datasheet), indicating RoHS compliance with lead-free matte-tin plating on annealed copper leads per MIL-STD-750 Method 2026. The epoxy case meets UL94V-0 flammability requirements, and the device is fully compatible with lead-free reflow profiles up to 260 °C.
1N5373A/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
1N5373A/TR12 FAQ
1.How can I place an order for 1N5373A/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5373A/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 1N5373A/TR12 reliable?
The price and inventory of 1N5373A/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5373A/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5373A/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5373A/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5373A/TR12?
1N5373A/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5373A/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 1N5373A/TR12?
For technical support, including 1N5373A/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5373A/TR12 requirements.
6.How does Aetrix verify that 1N5373A/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5373A/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 1N5373A/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5373A/TR12?
All 1N5373A/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5373A/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 1N5373A/TR12 part is unused and in its original packaging.
Return procedure for 1N5373A/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5373A/TR12 Tags
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