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Microchip Technology 1N5373C/TR12
- Part No.:
- 1N5373C/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5373C/TR12.pdf
- Description:
- DIODE ZENER 68V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:8,741
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Product details
Overview
1N5373C/TR12 from Microsemi is a 5 W, 68 V ±2% axial-leaded silicon Zener diode optimized for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation. It delivers 49 V zener voltage at 20 mA test current, maintains ≤2.0 V regulation (ΔVZ) across 10–50% of max current, and operates from –65°C to +150°C.
For engineers reviewing the 1N5373C/TR12 datasheet, 1N5373C/TR12 pinout, 1N5373C/TR12 application, or 1N5373C/TR12 equivalent, this page provides verified electrical parameters, thermal derating behavior, JEDEC T-18 package details, and validated alternatives for industrial power design, telecom surge clamping, and analog reference stability.
Technical Context
This Zener operates in reverse breakdown with cathode-banded polarity, requiring the banded end to be held positive relative to the anode. Its 25 °C/W junction-to-lead thermal resistance enables stable 5 W dissipation at TL < 25°C with 3/8″ lead length, while FR4 mounting reduces steady-state power to 1.47 W at TA = 25°C.
Dynamic impedance is specified as 70 Ω at 20 mA (IZT), with knee impedance ZZK = 500 Ω at 1 mA. Surge capability reaches 500 A (8.3 ms half-sine), and reverse leakage stays ≤0.5 μA at VR = 51.7 V - confirming tight regulation performance under transient and low-current conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±2% at 20 mA - ensures precise reference accuracy for feedback networks requiring tight tolerance. |
| Power Dissipation | 5.0 W at TL < 25°C - supports high-stability regulation without forced cooling in compact power stages. |
| Dynamic Impedance (ZZ) | 70 Ω at IZT = 20 mA - minimizes output voltage variation under load current changes in shunt regulator designs. |
| Voltage Regulation (ΔVZ) | ≤2.0 V between 10% and 50% of IZM - guarantees predictable reference drift across operating current range. |
| Max Reverse Current (IR) | ≤0.5 μA at VR = 51.7 V - confirms low leakage for high-impedance bias/reference applications. |
| Surge Current (IZSM) | 500 A (8.3 ms half-sine) - enables robust transient suppression in DC bus protection circuits. |
| Operating Temperature | –65°C to +150°C - suitable for under-hood automotive, industrial control, and outdoor telecom equipment. |
Pinout & Package
JEDEC T-18 axial-leaded plastic package with void-free UL94V-0 epoxy body, tin-lead or RoHS-compliant matte-tin plating, and cathode indicated by color band. Leads are 3/8″ (10 mm) from body for thermal rating compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or lower-potential rail; forms return path for zener current. |
| Cathode | Regulated output node | Banded end; connected to regulated voltage point; must be held positive relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener tolerance (C suffix) | Enables tighter closed-loop regulation than ±5% (B) or ±10% (A) variants, reducing need for external trimming. |
| 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) | Eliminates ESD protection circuitry in board-level design for cost-sensitive industrial systems. |
| High surge current rating (500 A) | Provides single-device overvoltage clamping for 12–48 V DC power rails without series limiting resistors. |
| Thermal resistance: 25 °C/W (junction-to-lead) | Allows full 5 W operation with minimal heatsinking when leads are mounted ≥10 mm from PCB body. |
Applications
| Switch-Mode Power Supply Feedback | DC Bus Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 68 V threshold for TL431-type error amplifier biasing. Use Value: ±2% tolerance ensures <±1.5% output regulation drift across line/load/temperature, meeting EN 61000-3-2 Class D requirements. |
Use Scenario: Protecting 48 V telecom rectifier outputs against lightning-induced surges. IC Role / Device Role / Timing Role: Fast-acting shunt clamp absorbing transient energy before downstream MOSFETs or controllers fail. Use Value: 500 A surge rating handles IEC 61000-4-5 Level 4 (4 kV) surges without degradation, eliminating need for parallel TVS arrays. |
| Analog Voltage Reference | Industrial Sensor Excitation |
Use Scenario: Providing stable excitation for 4–20 mA loop-powered pressure transmitters. IC Role / Device Role / Timing Role: Low-drift Zener reference replacing buried-Zener ICs where space or cost constraints prohibit integrated solutions. Use Value: ΔVZ ≤2.0 V across 2–10 mA operating range ensures <0.1% FS error contribution to sensor output accuracy. |
Use Scenario: Biasing bridge-based strain gauges in hydraulic valve position sensors. IC Role / Device Role / Timing Role: Fixed 68 V reference feeding precision resistor divider to generate 5 V or 10 V excitation rails. Use Value: 0.5 μA max IR at 51.7 V prevents loading errors in high-impedance divider networks (>1 MΩ). |
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. ±2%); otherwise identical VZ, IZT, ZZ, and thermal specs. | Acceptable where feedback loop gain compensates for wider reference tolerance. | Select when cost sensitivity outweighs need for tight regulation; same footprint and thermal profile. |
| MMBZ5268B-TP | Surface-mount SOD-123 package; 68 V ±5%, 0.5 W rating; 10× smaller size but 10× lower power. | Limited to low-power biasing or signal-level clamping; cannot replace 1N5373C/TR12 in 5 W applications. | Choose only for space-constrained PCBs with <100 mW dissipation needs; not a drop-in replacement. |
Compared with 1N5373B/TR12, the 1N5373C/TR12 offers superior regulation accuracy at identical thermal and surge performance; versus MMBZ5268B-TP, it provides 10× higher power handling in axial-leaded form - critical for industrial power stage protection.
Availability
1N5373C/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, telecom surge protection circuits, and analog instrumentation requiring stable component supply with traceable lot history and long-term lifecycle support.
Supply support for 1N5373C/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 components for aerospace, defense, and industrial markets.
The 1N53xx series was designed specifically for ruggedized 5 W Zener regulation in harsh-environment power systems - emphasizing thermal robustness, surge resilience, and MIL-grade screening compatibility.
FAQ
What is the Zener voltage tolerance of the 1N5373C/TR12?
The 1N5373C/TR12 has a Zener voltage tolerance of ±2%, as indicated by the "C" suffix per Microsemi's documentation. This means its nominal 68 V Zener voltage falls within 66.64 V to 69.36 V at 20 mA test current and 25°C. The tighter tolerance improves regulation accuracy in feedback loops compared to ±5% (B suffix) or ±10% (A suffix) variants.
Can the 1N5373C/TR12 be used in surface-mount designs?
No - the 1N5373C/TR12 uses a through-hole axial-leaded T-18 package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5373B series (DO-214AA) or SMBG5373B (DO-214AB), both rated for 5 W but requiring different PCB footprints and thermal layout rules than the 1N5373C/TR12.
What is the maximum continuous current the 1N5373C/TR12 can handle?
The 1N5373C/TR12 supports a maximum Zener current (IZM) of 73.5 mA at 25°C lead temperature, calculated as P/VZM = 5 W / 69.36 V. Derating applies above 25°C: power drops linearly to zero at 150°C junction temperature. Full 5 W operation requires maintaining TL < 25°C with ≥10 mm lead length from the body.
Does the 1N5373C/TR12 require moisture preconditioning before reflow?
No - the 1N5373C/TR12 has IPC/JEDEC J-STD-020B moisture sensitivity level 1, meaning it is not hygroscopic and requires no dry pack or baking prior to soldering. It withstands standard 260°C for 10 s reflow profiles without popcorn failure or delamination, simplifying manufacturing flow.
How does the 1N5373C/TR12 compare to the 1N5373B/TR12 in terms of thermal performance?
The 1N5373C/TR12 and 1N5373B/TR12 share identical thermal characteristics: both have 25 °C/W junction-to-lead resistance and 85 °C/W junction-to-ambient (FR4, 1 oz Cu). The only difference is Zener voltage tolerance (±2% vs. ±5%). Thermal design, heatsinking, and PCB layout requirements are fully interchangeable between these two variants.
1N5373C/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:
- ±2%
- 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
1N5373C/TR12 FAQ
1.How can I place an order for 1N5373C/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5373C/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 1N5373C/TR12 reliable?
The price and inventory of 1N5373C/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5373C/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5373C/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5373C/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5373C/TR12?
1N5373C/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5373C/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 1N5373C/TR12?
For technical support, including 1N5373C/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5373C/TR12 requirements.
6.How does Aetrix verify that 1N5373C/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5373C/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 1N5373C/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5373C/TR12?
All 1N5373C/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5373C/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 1N5373C/TR12 part is unused and in its original packaging.
Return procedure for 1N5373C/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5373C/TR12 Tags
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