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Microchip Technology 1N5369A/TR8
- Part No.:
- 1N5369A/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5369A/TR8.pdf
- Description:
- DIODE ZENER 51V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,084
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Product details
Overview
1N5369A/TR8 from Microsemi is a silicon 5 W axial-leaded Zener diode with nominal regulation voltage of 51 V, ±10% tolerance (A suffix), 25 Ω maximum dynamic impedance at 25 mA test current, and 25 mA maximum reverse leakage at 38.8 V. It operates from –65 °C to +150 °C and delivers stable voltage reference in power supply feedback loops, overvoltage clamping circuits, and precision shunt regulators.
For engineers reviewing the 1N5369A/TR8 datasheet, 1N5369A/TR8 pinout, 1N5369A/TR8 application, or 1N5369A/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (230 A), steady-state power derating on FR4, and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal shunt regulator, maintaining a stable 51 V across its terminals when reverse-biased above its knee voltage and within its specified operating current range (IZT = 25 mA, IZM = 98 mA). Its low 25 °C/W thermal resistance enables high-current operation with minimal lead-length heat sinking (3/8″ from body).
The 1N5369A/TR8 exhibits 0.9 V maximum forward voltage at 1.0 A, 25 Ω dynamic impedance (ZZ) at IZT, and 230 A non-repetitive surge current (8.3 ms half-sine). Voltage regulation ΔVZ is 2.5 V - measured as the difference between voltages at 10% and 50% of IZM - confirming tight regulation under varying load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V ±10% - defines precise clamping threshold for overvoltage protection and reference stability |
| Test Current (IZT) | 25 mA - operating point where VZ and dynamic impedance are guaranteed |
| Dynamic Impedance (ZZ) | 25 Ω max - determines output voltage variation under changing load current |
| Max Reverse Leakage (IR) | 0.5 μA at 38.8 V - ensures minimal standby power loss in high-impedance bias networks |
| Power Dissipation (PD) | 5.0 W at TL = 25 °C - sets absolute thermal limit before derating begins |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables direct thermal path design using lead length as heatsink |
| Surge Current (IZSM) | 230 A (8.3 ms half-sine) - supports transient overvoltage suppression without failure |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by band; leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026.
| 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; connects to voltage node requiring stabilization or clamping at 51 V |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N53xx series | Industry-standard footprint and electrical behavior enabling drop-in replacement across legacy designs |
| 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) | Robust handling during manual assembly and board rework without special precautions |
| RoHS-compliant (e3 suffix) | Meets global environmental compliance requirements without performance trade-offs |
| High surge current capability | 230 A rating supports robust protection against lightning-induced transients and inductive switching spikes |
Applications
| Switch-Mode Power Supply Feedback | Industrial Overvoltage Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler feedback network. IC Role / Device Role / Timing Role: Shunt reference providing precise 51 V threshold to error amplifier input. Use Value: Maintains ±10% output regulation across line/load variations while surviving 230 A surge events. |
Use Scenario: Protects PLC analog input stages from field-wiring transients up to 1 kV. IC Role / Device Role / Timing Role: Clamping element diverting excess energy to ground before downstream op-amps saturate. Use Value: Limits voltage to ≤51 V with <0.5 μA leakage at 38.8 V, preserving signal integrity and sensor accuracy. |
| DC Motor Field Winding Protection | Programmable Logic Controller (PLC) Reference |
Use Scenario: Suppresses inductive kickback from 24 V DC motor field coils during PWM switching. IC Role / Device Role / Timing Role: Bidirectional energy sink absorbing reverse EMF spikes across coil terminals. Use Value: Withstands repeated 230 A surges and maintains 51 V clamping with 25 Ω dynamic impedance for predictable energy dissipation. |
Use Scenario: Provides stable 51 V reference for 16-bit ADC calibration in modular I/O modules. IC Role / Device Role / Timing Role: Precision shunt regulator establishing known voltage for ratiometric measurement. Use Value: Delivers ±10% tolerance and 2.5 V regulation (ΔVZ) across temperature, ensuring <±0.02% FS ADC error contribution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5369B/TR8 | ±5% tolerance (vs. ±10%); identical VZ, IZT, ZZ, and package | Higher precision required in feedback loops where tighter regulation reduces output variance | Select when system-level voltage tolerance budget demands <±5% reference stability |
| MMSZ5255B-TP | Surface-mount SOD-123; 51 V ±5%, 500 mW rating; no axial lead or 5 W capability | Used in space-constrained, low-power consumer electronics - not suitable for high-current or surge-prone environments | Choose only for compact PCB layouts with <100 mA average current and no surge exposure |
Compared with 1N5369A/TR8, the 1N5369B/TR8 offers improved voltage accuracy without sacrificing power or ruggedness, while MMSZ5255B-TP trades 5 W capability and surge resilience for miniaturization - making it unsuitable for industrial power or protection roles served by the 1N5369A/TR8.
Availability
1N5369A/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, motor control protection circuits, and programmable logic controller (PLC) reference designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1N5369A/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 power management solutions for aerospace, defense, and industrial markets.
The 1N53xx series was engineered for ruggedized voltage regulation in harsh-environment power systems - emphasizing thermal robustness, surge survivability, and JEDEC-standard compatibility for long-lifecycle industrial deployments.
FAQ
What is the Zener voltage tolerance of the 1N5369A/TR8?
The 1N5369A/TR8 has a nominal Zener voltage of 51 V with ±10% tolerance, as designated by the "A" suffix per Microsemi's datasheet. This means the actual measured VZ falls between 45.9 V and 56.1 V at 25 °C with 25 mA test current. The tolerance directly impacts regulation accuracy in feedback and clamping applications.
Does the 1N5369A/TR8 require dry packing before PCB assembly?
No, the 1N5369A/TR8 has IPC/JEDEC J-STD-020B Moisture Sensitivity Level 1 classification, meaning it is not moisture-sensitive and requires no dry pack or baking prior to reflow soldering. Its void-free thermosetting epoxy body ensures reliable handling under standard factory conditions.
What is the maximum surge current rating for the 1N5369A/TR8?
The 1N5369A/TR8 is rated for 230 A maximum non-repetitive surge current (IZSM) using an 8.3 ms half-sine waveform. This value reflects its ability to absorb transient energy without degradation - critical for protecting downstream circuitry from inductive switching or lightning-induced spikes.
How does thermal resistance affect the 1N5369A/TR8's power handling?
The 1N5369A/TR8 has a junction-to-lead thermal resistance of 25 °C/W. When mounted with 3/8″ (10 mm) lead length from the body, this allows full 5.0 W dissipation at 25 °C lead temperature. Derating is linear beyond that - e.g., at 75 °C lead temp, max power drops to 4.0 W - enabling predictable thermal design without PCB copper heatsinking.
Is the 1N5369A/TR8 RoHS compliant?
Yes, the "TR8" suffix indicates tape-and-reel packaging, and the base part 1N5369A is RoHS compliant per Microsemi's e3 designation. Its leads feature annealed matte-tin plating meeting MIL-STD-750 Method 2026, and the epoxy body complies with UL94V-0 flammability standards.
1N5369A/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):
- 51 V
- Tolerance:
- ±10%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 27 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 36.7 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
1N5369A/TR8 FAQ
1.How can I place an order for 1N5369A/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5369A/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 1N5369A/TR8 reliable?
The price and inventory of 1N5369A/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5369A/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5369A/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5369A/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5369A/TR8?
1N5369A/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5369A/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 1N5369A/TR8?
For technical support, including 1N5369A/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5369A/TR8 requirements.
6.How does Aetrix verify that 1N5369A/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5369A/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 1N5369A/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5369A/TR8?
All 1N5369A/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5369A/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 1N5369A/TR8 part is unused and in its original packaging.
Return procedure for 1N5369A/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5369A/TR8 Tags
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