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Microchip Technology 1N5366B/TR12
- Part No.:
- 1N5366B/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5366B/TR12.pdf
- Description:
- DIODE ZENER 39V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,580
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Product details
Overview
1N5366B/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 39 V, ±5% tolerance (B suffix), 30 mA test current, 14 Ω dynamic impedance at 30 mA, and maximum reverse current of 0.5 μA at 29.7 V. It operates from –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5366B/TR12 datasheet, 1N5366B/TR12 pinout, 1N5366B/TR12 application, or 1N5366B/TR12 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (170 A), voltage regulation (ΔVZ = 3.1 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal shunt regulator, maintaining stable output voltage across a wide operating current range (10%–50% of IZM). Its low dynamic impedance (14 Ω) and tight voltage regulation (3.1 V ΔVZ) ensure minimal deviation under load transients.
Designed for through-hole mounting on FR4 PCBs with 4 mm² copper pads, it delivers 1.47 W steady-state power at 25 °C ambient and up to 5 W at 25 °C lead temperature (3/8″ from body), leveraging its 25 °C/W junction-to-lead thermal resistance for reliable heat dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal, ±5% tolerance - defines regulated output voltage under 30 mA test current |
| Power Dissipation | 5.0 W at TL = 25 °C - supports high-current regulation when adequately heat-sunk |
| Dynamic Impedance (ZZ) | 14 Ω at IZT = 30 mA - ensures low voltage variation with changing load current |
| Max Reverse Current | 0.5 μA at VR = 29.7 V - guarantees low leakage in standby and precision reference modes |
| Surge Current (IZSM) | 170 A (8.3 ms half-sine) - withstands transient overvoltage events without failure |
| Voltage Regulation (ΔVZ) | 3.1 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity |
| Thermal Resistance | 25 °C/W junction-to-lead - enables predictable thermal design with standard lead length mounting |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by band; leads plated with RoHS-compliant annealed matte tin per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias; referenced ground in shunt regulation | Connected to lower-potential node (e.g., ground or return path) in voltage regulation circuits |
| Cathode | Current exit terminal during forward bias; regulated output node in shunt configuration | Banded end; connected to input rail to clamp voltage at 39 V relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Ensures standardized mechanical dimensions and electrical behavior across global supply chain |
| 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 need for special ESD handling during manufacturing and field service |
| RoHS-compliant (e3 suffix) | Meets EU Directive 2011/65/EU - suitable for environmentally regulated industrial and telecom applications |
| High surge current capability | 170 A peak (8.3 ms) - protects downstream circuitry against lightning-induced or switching transients |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 39 V threshold for TL431-type error amplifier control. Use Value: Tight ±5% tolerance and low ΔVZ (3.1 V) minimize output voltage drift across line/load/temperature variations. | Use Scenario: Provides stable excitation voltage for bridge-based pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Precision analog reference source replacing higher-cost IC references where 39 V bias is required. Use Value: Low 0.5 μA reverse leakage at 29.7 V ensures minimal sensor offset error and long-term stability. |
| Overvoltage Protection Clamp | Programmable Threshold Detector |
Use Scenario: Placed across input rails of 24 V industrial controllers to suppress surges above 39 V. IC Role / Device Role / Timing Role: Passive crowbar element clamping transient energy into safe dissipation path. Use Value: 170 A surge rating and 5 W continuous power enable robust protection without external active components. | Use Scenario: Configured with resistor divider to trigger comparator at 39 V threshold in battery management systems. IC Role / Device Role / Timing Role: Programmable voltage threshold generator setting trip point for undervoltage/overvoltage alarms. Use Value: Stable 39 V regulation with <1% hysteresis (via ZZ × Iripple) ensures repeatable detection across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5366B (bulk) | Identical electrical specs; differs only in packaging - no tape-and-reel (TR) carrier | Suitable for manual prototyping or low-volume hand-soldering; lacks automated placement compatibility | Select 1N5366B/TR12 for SMT line integration; choose bulk 1N5366B for bench validation or repair spares |
| MMSZ5259ET1G | Surface-mount SOD-123 package; 39 V ±5%, but rated at 500 mW (not 5 W); ZZ = 70 Ω | Not interchangeable for high-power regulation; limited to low-current bias/reference roles | Use MMSZ5259ET1G only where board space is constrained and power <100 mW; retain 1N5366B/TR12 for >1 W dissipation |
Compared with 1N5366B (bulk) and MMSZ5259ET1G, the 1N5366B/TR12 uniquely combines JEDEC-standard axial packaging, 5 W power handling, tape-and-reel delivery for pick-and-place, and verified 39 V ±5% regulation - making it the sole option for high-reliability, high-power, production-ready Zener clamping.
Availability
1N5366B/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor references, and overvoltage protection circuits requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N5366B/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 1N53xxB series was designed specifically for ruggedized, high-power voltage regulation in harsh-environment power systems - emphasizing thermal robustness, surge resilience, and JEDEC-standardized manufacturability.
FAQ
What is the Zener voltage tolerance of the 1N5366B/TR12?
The 1N5366B/TR12 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix per Microsemi's documentation. This means its actual regulation voltage falls within 37.05 V to 40.95 V at 30 mA test current and 25 °C lead temperature. The tolerance is guaranteed across the full operating temperature range (–65 °C to +150 °C), and the 1N5366B/TR12 is tested to meet this specification before shipment.
Can the 1N5366B/TR12 be used in surface-mount designs?
No, the 1N5366B/TR12 is an axial-leaded T-18 package intended for through-hole mounting. It is not compatible with surface-mount assembly processes. For SMT equivalents, Microsemi offers the SMBJ5366B or SMBG5366B in DO-214AA/DO-214AB packages - these share identical electrical specs but require different footprint and reflow profiles compared to the 1N5366B/TR12.
What is the maximum steady-state power dissipation of the 1N5366B/TR12 on a standard FR4 PCB?
When mounted on a standard FR4 PCB (1 oz Cu) with 4 mm² copper pads and 1 mm track width, the 1N5366B/TR12 has a steady-state power dissipation limit of 1.47 W at 25 °C ambient temperature. This derates linearly above 25 °C per the published thermal resistance of 85 °C/W junction-to-ambient. Full 5 W operation requires heatsinking at the leads (3/8″ from body) at 25 °C lead temperature.
Does the 1N5366B/TR12 meet RoHS requirements?
Yes, the 1N5366B/TR12 is RoHS compliant, as confirmed by the "e3" suffix in its full manufacturer designation (1N5366B/TR12 e3). Its leads feature RoHS-compliant annealed matte-tin plating per MIL-STD-750 Method 2026, and its void-free thermosetting epoxy body meets UL94V-0 flammability standards - satisfying EU Directive 2011/65/EU without exemptions.
How is polarity marked on the 1N5366B/TR12?
The 1N5366B/TR12 uses a cathode band for polarity identification: the banded end is the cathode and must be held at a more positive potential than the anode to achieve Zener breakdown and regulation. In shunt regulator configurations, the cathode connects to the voltage rail being regulated, while the anode connects to ground or the return path. Forward voltage is specified as ≤1.2 V at 1.0 A, confirming standard silicon diode behavior in forward bias.
1N5366B/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:
- ±5%
- 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
1N5366B/TR12 FAQ
1.How can I place an order for 1N5366B/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5366B/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 1N5366B/TR12 reliable?
The price and inventory of 1N5366B/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5366B/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5366B/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5366B/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5366B/TR12?
1N5366B/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5366B/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 1N5366B/TR12?
For technical support, including 1N5366B/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5366B/TR12 requirements.
6.How does Aetrix verify that 1N5366B/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5366B/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 1N5366B/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5366B/TR12?
All 1N5366B/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5366B/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 1N5366B/TR12 part is unused and in its original packaging.
Return procedure for 1N5366B/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5366B/TR12 Tags
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