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Microchip Technology 1N5366B/TR8
- Part No.:
- 1N5366B/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5366B/TR8.pdf
- Description:
- DIODE ZENER 39V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:9,666
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Product details
Overview
1N5366B/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 39 V, ±5% tolerance (B suffix), 30 mA test current (IZT), 14 Ω dynamic impedance (ZZ), and maximum reverse current of 0.5 μA at 29.7 V (VR). 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 1N5366B/TR8 datasheet, 1N5366B/TR8 pinout, 1N5366B/TR8 application, or 1N5366B/TR8 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 e3 marking compatibility.
Technical Context
This device functions as a two-terminal voltage regulator in reverse-bias mode, maintaining stable output voltage across wide operating current (10–50% of IZM) and temperature ranges. Its low dynamic impedance (14 Ω) and tight ±5% VZ tolerance ensure minimal voltage drift under load variation.
The 1N5366B/TR8 uses a void-free thermosetting epoxy T-18 package with tin-lead or matte-tin plating, rated for 260 °C soldering (10 s), and meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity-no dry pack required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V ±5% - precise regulation point for 36–42 V system references |
| Test Current (IZT) | 30 mA - defined operating point for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 14 Ω - low AC resistance ensures stable voltage under varying load currents |
| Max Reverse Current (IR) | 0.5 μA at 29.7 V - confirms sharp knee and low leakage below regulation threshold |
| Max Regulator Current (IZM) | 170 mA - maximum DC current at 25 °C lead temperature before thermal derating |
| 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 |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case per JEDEC DO-204AL, with cathode indicated by band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; grounded or low-side reference node in Zener regulation | Connected to circuit ground or lower potential node when used as shunt regulator |
| Cathode | Current exit terminal in forward bias; high-side regulated output node in reverse bias | Banded end - connected to unregulated input; maintains 39 V at cathode relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures standardized mechanical dimensions and electrical behavior across global supply chain |
| ±5% voltage tolerance (B suffix) | Reduces need for post-production trimming in mid-precision voltage reference designs |
| 25 °C/W junction-to-lead thermal resistance | Enables 5 W operation with simple 3/8″ lead heatsinking-no PCB copper pour required |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for on-board ESD protection during handling and assembly |
| e3 RoHS-compliant marking option | Supports environmental compliance without performance or reliability trade-offs |
Applications
| Industrial Power Supply Reference | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter secondary-side error amplifiers. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 39 V reference to optocoupler input or TL431 comparator. Use Value: Maintains ±1.5% output regulation over line/load/temperature with no active components. | Use Scenario: Protecting 36 V-rated MOSFET gate drivers from transient spikes in motor control H-bridges. IC Role / Device Role / Timing Role: Passive clamping element diverting excess energy to ground when voltage exceeds 39 V. Use Value: Absorbs 170 A surge (8.3 ms) without degradation, preventing gate oxide rupture. |
| Programmable Current Source Bias | Temperature-Stable Sensor Excitation |
Use Scenario: Setting constant current through precision RTD or strain gauge bridges using op-amp feedback. IC Role / Device Role / Timing Role: Fixed-voltage node establishing reference for current-setting resistor in Howland source topology. Use Value: Delivers <0.5 μA leakage at 29.7 V, minimizing bridge offset error in 24-bit ADC systems. | Use Scenario: Providing excitation voltage to platinum RTD sensors in HVAC and process control transmitters. IC Role / Device Role / Timing Role: Low-drift voltage source compensating for sensor self-heating effects across –40 °C to +85 °C ambient. Use Value: ΔVZ = 3.1 V ensures <±0.1% excitation stability over full IZM range, critical for <0.1 °C measurement accuracy. |
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-TR8 denotes tape-and-reel (EIA-296), bulk lacks reel format | No functional difference; TR8 enables automated SMT placement, bulk requires manual or vibration feed | Select 1N5366B/TR8 for high-volume production with pick-and-place; choose bulk for prototyping or low-run repair |
| MMBZ5259BLT1G | Surface-mount SOT-23 package; 39 V ±5%, but lower 0.5 W power rating and higher 40 Ω ZZ | Not suitable for 5 W continuous dissipation; limited to low-power signal-level clamping or biasing | Use MMBZ5259BLT1G only where board space is constrained and power <0.5 W; retain 1N5366B/TR8 for power regulation |
Compared with 1N5366B (bulk) and MMBZ5259BLT1G, the 1N5366B/TR8 uniquely combines JEDEC-standard axial packaging, 5 W dissipation capability, and tape-and-reel automation readiness-making it optimal for industrial power supply manufacturing where thermal robustness and assembly efficiency are jointly critical.
Availability
1N5366B/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and precision sensor excitation systems requiring stable component supply and long-term lifecycle support.
Supply support for 1N5366B/TR8 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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N53xxB series was designed for ruggedized voltage regulation in harsh-environment power systems-emphasizing thermal resilience, surge immunity, and long-term parametric stability under extended temperature cycling.
FAQ
What is the Zener voltage tolerance of the 1N5366B/TR8?
The 1N5366B/TR8 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix per Microsemi's documentation. This means its nominal 39 V regulation point falls within 36.99 V to 41.01 V at 30 mA test current and 25 °C lead temperature. The tolerance remains stable across its operating temperature range of –65 °C to +150 °C, supporting reliable performance in industrial environments where thermal cycling occurs.
Can the 1N5366B/TR8 be used in surface-mount designs?
No-the 1N5366B/TR8 is an axial-leaded T-18 package and is not compatible with surface-mount assembly. Microsemi offers surface-mount equivalents such as SMBJ5366B (DO-214AA) and SMCJ5366B (DO-214AB), but these differ in thermal performance, surge rating, and footprint. Using 1N5366B/TR8 in SMT processes would require through-hole rework or adapter fixtures, compromising reliability and manufacturability.
What is the maximum steady-state power dissipation for the 1N5366B/TR8 on a standard FR4 PCB?
When mounted on a standard FR4 PCB (1 oz copper) with 4 mm² copper pads and 1 mm track width (25 mm length), the 1N5366B/TR8 has a steady-state power rating of 1.47 W at 25 °C ambient temperature. This is derived from its 85 °C/W junction-to-ambient thermal resistance. For full 5 W operation, the device must be heatsunk via its leads at 3/8″ (10 mm) length from the body, achieving 25 °C/W junction-to-lead resistance.
Does the 1N5366B/TR8 meet RoHS requirements?
Yes-the "e3" suffix in the full part number designation (1N5366B/TR8 e3) indicates RoHS compliance per EU Directive 2011/65/EU. The device uses matte-tin plating on leads and halogen-free epoxy encapsulation. Microsemi confirms this version contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and is suitable for environmentally regulated industrial and medical equipment.
How does the voltage regulation (ΔVZ) specification impact circuit design with the 1N5366B/TR8?
The 1N5366B/TR8 has a voltage regulation (ΔVZ) of 3.1 V-defined as the difference between Zener voltage measured at 10% and 50% of its maximum regulator current (IZM = 170 mA). This parameter quantifies how tightly the device maintains 39 V across its usable current range (17–85 mA). Designers use ΔVZ to calculate worst-case output variation in shunt regulator topologies, ensuring downstream ICs receive stable bias within their absolute maximum ratings.
1N5366B/TR8 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/TR8 FAQ
1.How can I place an order for 1N5366B/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5366B/TR8 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/TR8 reliable?
The price and inventory of 1N5366B/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5366B/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5366B/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5366B/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5366B/TR8?
1N5366B/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5366B/TR8 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/TR8?
For technical support, including 1N5366B/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5366B/TR8 requirements.
6.How does Aetrix verify that 1N5366B/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5366B/TR8 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/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5366B/TR8?
All 1N5366B/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5366B/TR8, 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/TR8 part is unused and in its original packaging.
Return procedure for 1N5366B/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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