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Microchip Technology 1N5366A/TR12
- Part No.:
- 1N5366A/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5366A/TR12.pdf
- Description:
- DIODE ZENER 39V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:3,252
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Product details
Overview
1N5366A/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal zener voltage of 39 V, ±10% tolerance (A suffix), 30 mA test current (IZT), 14 Ω dynamic impedance (ZZ), and 170 mA maximum zener current (IZM) when adequately heat-sunk. It regulates voltage in power supply feedback loops, overvoltage protection circuits, and reference voltage generation for industrial power converters.
For engineers reviewing the 1N5366A/TR12 datasheet, 1N5366A/TR12 pinout, 1N5366A/TR12 application, or 1N5366A/TR12 equivalent, key selection criteria include verified 39 V regulation at 30 mA, ±10% voltage tolerance, 5 W steady-state power dissipation at TL < 25°C, low 14 Ω dynamic impedance, and axial T-18 package compatibility with through-hole PCB assembly.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown to maintain stable output voltage across varying load and line conditions. Its 39 V nominal zener voltage is specified at 30 mA test current with 14 Ω dynamic impedance measured at 1 kHz AC superimposed on DC bias.
The 1N5366A/TR12 features a thermal resistance of 25 °C/W junction-to-lead (at 10 mm lead length) and 85 °C/W junction-to-ambient on FR4 board, enabling reliable 5 W operation with appropriate heat sinking. It exhibits ≤0.65 V voltage regulation (ΔVZ) between 10% and 50% of IZM and withstands 170 mA maximum dc current under rated conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal, ±10% tolerance - defines regulated output voltage range (35.1–42.9 V) under specified test conditions |
| Test Current (IZT) | 30 mA - operating point where VZ is guaranteed; critical for setting bias in feedback networks |
| Dynamic Impedance (ZZ) | 14 Ω - low incremental resistance ensures minimal output voltage variation with load current changes |
| Max Zener Current (IZM) | 170 mA - maximum continuous reverse current before thermal runaway; requires heatsinking above ~1.47 W on PCB |
| Power Dissipation | 5.0 W at TL < 25°C (3/8″ lead length) - sets absolute thermal limit for safe continuous operation |
| Voltage Regulation (ΔVZ) | ≤0.65 V - difference between VZ measured at 17 mA and 85 mA, indicating stability across operating range |
| Surge Current (IZSM) | 170 A (8.3 ms half-sine) - peak non-repetitive surge capability for transient overvoltage clamping |
Pinout & Package
Package: Axial-leaded T-18 plastic case per JEDEC DO-204AL standard; cathode indicated by band; RoHS-compliant matte-tin plated leads; 0.7 g weight; moisture sensitivity level 1 (no dry pack required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower potential; forms return path during reverse-bias regulation |
| Cathode | Zener breakdown terminal / Regulated output node | Banded end; connected to unregulated input; maintains stable 39 V relative to anode under reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered axial Zener | Ensures mechanical and electrical interchangeability across qualified suppliers and legacy designs |
| ±10% voltage tolerance (A suffix) | Cost-optimized tolerance grade suitable for non-critical voltage references and clamping applications |
| Low 14 Ω dynamic impedance | Minimizes output voltage drift under dynamic load changes in power supply error amplifiers |
| 170 mA max DC current with heatsinking | Supports robust overvoltage protection in 24–48 V industrial systems without active cooling |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables handling and assembly without special ESD controls in standard manufacturing environments |
Applications
| Industrial Power Supply Feedback | Overvoltage Clamp for 48 V DC Bus |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converter feedback loop using optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Voltage reference element providing precise 39 V threshold to error amplifier comparator input. Use Value: Maintains ±1% output regulation over line/load/temperature with low ΔVZ and stable VZ at 30 mA bias. |
Use Scenario: Clamping transient surges on 48 V telecom or industrial DC distribution bus during load dump or inductive switching. IC Role / Device Role / Timing Role: Two-terminal shunt protector absorbing energy up to 170 A surge (8.3 ms) while limiting bus voltage to ≤42.9 V. Use Value: Prevents damage to downstream 50 V-rated MOSFETs and controllers without requiring active control circuitry. |
| Programmable Voltage Reference | DC-DC Converter Output Trim |
Use Scenario: Generating stable mid-rail reference in analog sensor signal conditioning circuits powered from 48 V supply. IC Role / Device Role / Timing Role: Passive precision reference node derived from series resistor + 1N5366A/TR12 parallel combination. Use Value: Delivers 39 V ±10% with <0.65 V regulation shift across 17–85 mA, enabling predictable offset calibration. |
Use Scenario: Fine-tuning output voltage of adjustable buck regulator via feedback divider tap point. IC Role / Device Role / Timing Role: Shunt-connected trim element that pulls feedback node voltage down when output exceeds 39 V threshold. Use Value: Enables ±5% output adjustment range without modifying primary resistor divider; leverages low ZZ for tight control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5366B/TR12 | Same 39 V nominal VZ, but ±5% tolerance (B suffix) and 122 Ω ZZK @ 1 mA; otherwise identical ratings | Higher precision reference for feedback loops requiring tighter regulation; slightly higher knee impedance | Select when ±5% VZ accuracy is required and 122 Ω knee impedance is acceptable for low-current biasing |
| MMBZ5265BLT1G | Surface-mount SOT-23 package; 39 V ±5%; 500 mW rating; 30 Ω ZZ; 65 mA IZM - not pin-compatible | Space-constrained PCBs where axial T-18 footprint is prohibitive; unsuitable for >0.5 W continuous dissipation | Choose only for low-power, high-density layouts; requires redesign for thermal management and mounting |
Compared with 1N5366A/TR12, the 1N5366B/TR12 offers tighter voltage tolerance at identical power and impedance specs, while the MMBZ5265BLT1G provides surface-mount convenience at drastically reduced power handling and thermal capability.
Availability
1N5366A/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, 48 V DC bus protection, and programmable voltage reference circuits requiring stable component supply and long-term obsolescence support.
Supply support for 1N5366A/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xxA/B series was designed for ruggedized 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 1N5366A/TR12?
The 1N5366A/TR12 has a nominal zener voltage of 39 V with a ±10% tolerance, as designated by the "A" suffix per Microsemi's documentation. This means the actual measured VZ at 30 mA test current falls within 35.1 V to 42.9 V at 25°C lead temperature. The tolerance is confirmed in the Electrical Characteristics table on page 2 of the official datasheet.
Can the 1N5366A/TR12 be used without a heatsink?
The 1N5366A/TR12 can dissipate up to 1.47 W continuously when mounted on an FR4 PCB with 4 mm² copper pads and 1 mm track width, per its 85 °C/W junction-to-ambient thermal resistance. For full 5 W operation, it requires heatsinking at the leads (3/8″ from body) to maintain TL < 25°C. Operating above derated power without heatsinking risks thermal failure.
What does the "TR12" suffix indicate in 1N5366A/TR12?
The "TR12" suffix indicates tape-and-reel packaging per EIA-296 standard, with 12,000 units per reel. This format supports automated SMT placement equipment despite the device being axial-leaded - the reels contain carrier tape with pockets sized for T-18 components, enabling high-volume assembly without manual handling.
Is the 1N5366A/TR12 RoHS compliant?
Yes, the 1N5366A/TR12 is RoHS compliant, as confirmed by the "e3" designation in the Microsemi datasheet title and specification notes. Its terminals use annealed matte-tin plating per MIL-STD-750 Method 2026, and the void-free epoxy case meets UL94V-0 flammability requirements without lead or halogen additives.
How does the voltage regulation (ΔVZ) specification apply to the 1N5366A/TR12?
The 1N5366A/TR12 has a maximum voltage regulation (ΔVZ) of 0.65 V, defined as the difference between VZ measured at 10% (17 mA) and 50% (85 mA) of its 170 mA maximum zener current (IZM). This parameter quantifies how tightly the device maintains 39 V across its usable current range, directly impacting output stability in feedback and reference applications.
1N5366A/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):
- 39 V
- Tolerance:
- ±10%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 14 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 28.1 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
1N5366A/TR12 FAQ
1.How can I place an order for 1N5366A/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5366A/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 1N5366A/TR12 reliable?
The price and inventory of 1N5366A/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5366A/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5366A/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5366A/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5366A/TR12?
1N5366A/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5366A/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 1N5366A/TR12?
For technical support, including 1N5366A/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5366A/TR12 requirements.
6.How does Aetrix verify that 1N5366A/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5366A/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 1N5366A/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5366A/TR12?
All 1N5366A/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5366A/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 1N5366A/TR12 part is unused and in its original packaging.
Return procedure for 1N5366A/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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