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Microchip Technology 1N5366E3/TR8
- Part No.:
- 1N5366E3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5366E3/TR8.pdf
- Description:
- DIODE ZENER 39V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,402
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Product details
Overview
1N5366E3/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 39 V, ±5% tolerance (B-suffix equivalent), 30 mA test current, 14 Ω dynamic impedance at IZT, and maximum reverse leakage 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 industrial power supplies.
For engineers reviewing the 1N5366E3/TR8 datasheet, 1N5366E3/TR8 pinout, 1N5366E3/TR8 application, or 1N5366E3/TR8 equivalent, key selection criteria include Zener voltage stability under varying load currents, low dynamic impedance for tight regulation, thermal resistance (25 °C/W junction-to-lead), RoHS compliance (e3 suffix), and tape-and-reel packaging (TR8 suffix) for automated assembly.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown, where the cathode band denotes the positive terminal during regulation. Its 39 V nominal Zener voltage is specified at 30 mA test current (IZT) and measured at 25 °C lead temperature with 40 ms stabilization time.
The 1N5366E3/TR8 exhibits 3.1 V maximum voltage regulation (ΔVZ) between 10% and 50% of IZM, 122 Ω dynamic knee impedance (ZZK) at 1 mA, and withstands 170 A non-recurrent surge current (8.3 ms half-sine). Its thermal resistance of 25 °C/W (junction-to-lead, 10 mm lead length) enables stable operation up to 5 W with adequate heat sinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal, ±5% tolerance - defines precise regulation point for feedback loops and reference circuits |
| Test Current (IZT) | 30 mA - standard bias condition for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 14 Ω at IZT - low AC resistance ensures minimal output voltage variation under changing load current |
| Max Reverse Leakage (IR) | 0.5 μA at 29.7 V - guarantees negligible standby current in high-impedance sensing or battery-backed circuits |
| Max Regulator Current (IZM) | 170 mA - maximum continuous DC current at 25 °C lead temperature before exceeding 5 W power limit |
| Surge Current (IZSM) | 170 A (8.3 ms half-sine) - supports transient overvoltage clamping without failure in surge-prone environments |
| Voltage Regulation (ΔVZ) | 3.1 V - difference between VZ at 10% and 50% of IZM, indicating regulation linearity across operating range |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by colored band; leads are annealed matte-tin plated per MIL-STD-750 Method 2026, RoHS compliant (e3), weight 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased input terminal | Connected to lower-potential node; carries full Zener current during regulation |
| Cathode (banded end) | Regulated output terminal | Provides stable 39 V reference relative to anode; must be held positive w.r.t. anode for conduction |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Industry-standard 1N53xxB series part with guaranteed parametric consistency across manufacturers |
| Moisture Sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out prior to reflow |
| Low Thermal Resistance | 25 °C/W junction-to-lead (3/8″ lead length) - enables 5 W dissipation without forced cooling in chassis-mount designs |
| ESD Robustness | Nonsensitive per MIL-STD-750 Method 1020 - suitable for manual handling and unshielded board-level integration |
| Tape-and-Reel Packaging | TR8 suffix indicates EIA-296–compliant reel format - supports high-speed pick-and-place assembly |
Applications
| Industrial Power Supply Reference | Overvoltage Clamp for DC Bus |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback or forward converter secondary-side regulation. IC Role / Device Role / Timing Role: Provides fixed 39 V reference for TL431 or optocoupler biasing, replacing higher-cost IC references. Use Value: Maintains ±1% output accuracy over –40 °C to +85 °C ambient due to low ΔVZ and stable VZ tempco. |
Use Scenario: Protecting 36 V nominal battery systems or 48 V telecom rails against transients exceeding 45 V. IC Role / Device Role / Timing Role: Shunts excess energy during surge events via controlled avalanche conduction. Use Value: Absorbs 170 A surges (8.3 ms) without degradation, eliminating need for parallel TVS arrays. |
| Programmable Current Source Bias | High-Voltage Sensor Interface |
Use Scenario: Setting bias current for op-amp-based constant-current drivers in LED or laser modules. IC Role / Device Role / Timing Role: Delivers stable 39 V across series resistor to generate precise current (e.g., 39 V / 1 kΩ = 39 mA). Use Value: Low ZZ (14 Ω) minimizes current drift vs. load variation, improving optical output stability. |
Use Scenario: Scaling down 100–200 V sensor outputs (e.g., pressure transducers) to 0–5 V ADC inputs. IC Role / Device Role / Timing Role: Forms upper leg of resistive divider with ultra-low leakage (<0.5 μA), preventing signal attenuation error. Use Value: Negligible reverse current avoids loading high-impedance sensor bridges, preserving measurement fidelity. |
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 | No e3 or TR8 suffix - leaded, non-RoHS, bulk packaged | Lacks RoHS compliance and tape-and-reel automation support | Select 1N5366B only for legacy non-RoHS production or prototyping where reel feed is unnecessary |
| SMBJ39A | Surface-mount SMC package, 400 W peak power, 39 V, ±5%, but higher ZZ (1.5 Ω typical) and lower IZM (100 mA) | Better surge handling but less stable DC regulation; requires PCB layout change | Choose SMBJ39A when space-constrained layouts or higher transient immunity outweigh need for precise DC reference stability |
Compared with 1N5366B and SMBJ39A, the 1N5366E3/TR8 uniquely combines JEDEC-standard axial form factor, RoHS compliance, tape-and-reel readiness, and low-impedance DC regulation-making it optimal for cost-sensitive, high-volume industrial power designs requiring long-term supply continuity and manual or semi-automated assembly.
Availability
1N5366E3/TR8 is available at Aetrix Electronics and suitable for industrial power supply reference, overvoltage clamp for DC bus, and programmable current source bias requiring stable component supply and long-lifecycle support.
Supply support for 1N5366E3/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, RF, and discrete components for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for ruggedized, high-power voltage regulation in harsh-environment power systems where long-term parametric stability and surge survivability are critical.
FAQ
What is the Zener voltage tolerance of 1N5366E3/TR8?
The 1N5366E3/TR8 has a ±5% Zener voltage tolerance, consistent with the "B" suffix in the 1N53xxB family. This means its actual regulation voltage falls between 37.05 V and 40.95 V at 30 mA test current and 25 °C lead temperature, as verified in the manufacturer's electrical characteristics table.
Does 1N5366E3/TR8 require derating above 25 °C ambient?
Yes - the 1N5366E3/TR8 must be derated linearly above 25 °C ambient when mounted on FR4 (1 oz Cu, 4 mm² pads), delivering only 1.47 W at 25 °C ambient and zero power at 115 °C. Derating follows a slope of 15.6 mW/°C, per Figure 1 in the official datasheet.
Is the 1N5366E3/TR8 RoHS compliant and lead-free?
Yes - the "e3" suffix explicitly denotes RoHS-compliant construction with annealed matte-tin plating and no lead content, meeting EU Directive 2011/65/EU. The device is moisture sensitivity level 1 and requires no dry pack prior to soldering.
What does the "TR8" suffix indicate in 1N5366E3/TR8?
The "TR8" suffix specifies EIA-296–compliant tape-and-reel packaging: 8 mm carrier tape, 12 mm cover tape, 2000 units per reel. This format enables compatibility with standard SMT pick-and-place equipment and supports high-throughput automated assembly lines.
Can 1N5366E3/TR8 replace 1N5366B in existing designs?
Yes - the 1N5366E3/TR8 is a direct functional and mechanical replacement for 1N5366B, with identical electrical specs, T-18 axial package, and cathode band polarity. The only differences are RoHS compliance (e3) and tape-and-reel packaging (TR8), both backward-compatible in most applications.
1N5366E3/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:
- ±20%
- 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
1N5366E3/TR8 FAQ
1.How can I place an order for 1N5366E3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5366E3/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 1N5366E3/TR8 reliable?
The price and inventory of 1N5366E3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5366E3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5366E3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5366E3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5366E3/TR8?
1N5366E3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5366E3/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 1N5366E3/TR8?
For technical support, including 1N5366E3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5366E3/TR8 requirements.
6.How does Aetrix verify that 1N5366E3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5366E3/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 1N5366E3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5366E3/TR8?
All 1N5366E3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5366E3/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 1N5366E3/TR8 part is unused and in its original packaging.
Return procedure for 1N5366E3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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