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Microchip Technology 1N5369A/TR12
- Part No.:
- 1N5369A/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5369A/TR12.pdf
- Description:
- DIODE ZENER 51V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,616
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Product details
Overview
1N5369A/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with a 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 40.8 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 1N5369A/TR12 datasheet, 1N5369A/TR12 pinout, 1N5369A/TR12 application, or 1N5369A/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (230 A), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage regulator in reverse-biased mode, maintaining stable output across wide current variation (IZM = 25 mA at 51 V). Its low thermal resistance enables high-power operation with minimal lead-length heat sinking (3/8″ from body).
The 1N5369A/TR12 exhibits 25 Ω dynamic impedance at IZT = 25 mA and ≤0.9 V voltage regulation (ΔVZ) between 10% and 50% of IZM - critical for low-noise reference stability in analog front-ends and feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V ±10% - defines regulated output level under specified test conditions (IZT = 25 mA, TL = 25 °C) |
| Power Dissipation | 5.0 W at TL < 25 °C - requires ≥10 mm lead length from body for full rating; derates linearly above 25 °C |
| Dynamic Impedance (ZZ) | 25 Ω max at IZT = 25 mA - determines output voltage deviation under load current changes |
| Reverse Leakage (IR) | 0.5 μA max at VR = 40.8 V - ensures minimal quiescent current in standby regulation circuits |
| Surge Current (IZSM) | 230 A peak (8.3 ms half-sine) - supports transient overvoltage clamping without failure |
| Thermal Resistance | 25 °C/W junction-to-lead - enables direct thermal path to PCB copper or chassis via leads |
| Voltage Regulation (ΔVZ) | ≤0.9 V - measured between 10% and 50% of IZM; quantifies regulation linearity in active region |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case (UL94V-0 epoxy), cathode indicated by band; leads are tin-lead or RoHS-compliant matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower-potential rail; forms return path during Zener conduction |
| Cathode | Zener regulation terminal / Output reference node | Banded end; connected to regulated voltage node; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N53xx series | Industry-standard footprint and electrical behavior enabling drop-in replacement across multiple vendors |
| 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 in standard manufacturing environments without special ESD controls |
| RoHS-compliant option (e3 suffix) | Matte-tin plating meets EU RoHS Directive 2011/65/EU and China RoHS II requirements |
| Tape-and-reel packaging (TR suffix) | Standard EIA-296 compliant carrier for automated SMT placement compatibility with axial-lead feeders |
Applications
| Industrial Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Zener reference for TL431-like shunt regulator or direct feedback node clamp. Use Value: Maintains ±10% output accuracy over temperature (–65 °C to +150 °C) and line/load transients due to low ΔVZ (≤0.9 V). |
Use Scenario: Clamping surge events on 48 V DC bus lines in telecom infrastructure equipment. IC Role / Device Role / Timing Role: Standby overvoltage limiter absorbing 8.3 ms surges up to 230 A peak. Use Value: Prevents downstream IC damage without crowbar action; self-resetting after transient dissipation. |
| Programmable Voltage Reference | DC-DC Converter Trim Adjustment |
|
Use Scenario: Providing stable 51 V reference for DAC-based calibration systems in test instrumentation. IC Role / Device Role / Timing Role: Precision voltage source for ADC reference scaling or sensor excitation. Use Value: Low dynamic impedance (25 Ω) minimizes error contribution when sourcing <1 mA load current. |
Use Scenario: Fine-tuning output voltage of adjustable buck regulators via feedback divider biasing. IC Role / Device Role / Timing Role: Bias element setting upper threshold of resistor-divider network. Use Value: Stable VZ tolerance (±10%) enables predictable trim range without iterative tuning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5369B/TR12 | ±5% VZ tolerance (vs. ±10% for 1N5369A/TR12); identical VZ, IZT, ZZ, and package | Higher precision required in closed-loop feedback where tighter regulation improves system accuracy | Select 1N5369B/TR12 when output stability better than ±5% is mandated; same thermal and surge ratings apply. |
| MMBZ5255B (SOT-23) | Surface-mount, 0.5 W rating, 51 V ±5%, 100 Ω ZZ; not pin-compatible or power-equivalent | Space-constrained designs where board area limits axial-leaded components | Choose MMBZ5255B only if power demand ≤0.5 W and layout allows SMT placement; not a functional substitute for 5 W operation. |
Compared with 1N5369B/TR12, the 1N5369A/TR12 trades voltage precision for cost and availability in legacy designs; versus MMBZ5255B, it delivers 10× higher power handling and lower impedance but requires axial mounting and larger PCB real estate.
Availability
1N5369A/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, telecom surge protection, programmable reference circuits, and DC-DC converter trim networks requiring stable component supply and long-term obsolescence management.
Supply support for 1N5369A/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, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N53xx series was designed for ruggedized voltage regulation in harsh-environment power systems - emphasizing thermal robustness, surge resilience, and JEDEC-standard interoperability.
FAQ
What is the Zener voltage tolerance for 1N5369A/TR12?
The "A" suffix in 1N5369A/TR12 specifies a ±10% Zener voltage tolerance at 25 °C, meaning the actual regulation voltage falls between 45.9 V and 56.1 V under standard test conditions (IZT = 25 mA, TL = 25 °C). This tolerance is confirmed in Microsemi's official 1N5333B–1N5388B datasheet Rev D, Table on Page 2.
Can 1N5369A/TR12 be used in surface-mount applications?
No - the 1N5369A/TR12 uses a T-18 axial-leaded package and is not compatible with SMT reflow processes. For surface-mount equivalents, Microsemi offers the SMBJ5369A series in DO-214AA (SMB) package; the 1N5369A/TR12 itself requires through-hole mounting with ≥10 mm lead length for full 5 W rating.
What is the maximum surge current rating for 1N5369A/TR12?
The 1N5369A/TR12 has a maximum non-recurrent surge current (IZSM) of 230 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating is validated per JEDEC standards and enables reliable transient suppression in DC bus protection circuits without degradation.
Is 1N5369A/TR12 RoHS compliant?
Yes - the "e3" designation in Microsemi's documentation confirms RoHS compliance for the 1N5369A/TR12 family. The device uses RoHS-compliant matte-tin plating on leads and meets EU Directive 2011/65/EU requirements, verified in the "Features" section of the official datasheet.
How does thermal resistance affect 1N5369A/TR12 power handling?
The 1N5369A/TR12 has a junction-to-lead thermal resistance of 25 °C/W. To sustain 5 W dissipation, the lead temperature (TL) must remain ≤25 °C - achieved by maintaining ≥10 mm lead length from the epoxy body. On FR4 PCBs, derating to 1.47 W is required at TA = 25 °C due to higher junction-to-ambient resistance (85 °C/W).
1N5369A/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):
- 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/TR12 FAQ
1.How can I place an order for 1N5369A/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5369A/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 1N5369A/TR12 reliable?
The price and inventory of 1N5369A/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5369A/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5369A/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5369A/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5369A/TR12?
1N5369A/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5369A/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 1N5369A/TR12?
For technical support, including 1N5369A/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5369A/TR12 requirements.
6.How does Aetrix verify that 1N5369A/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5369A/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 1N5369A/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5369A/TR12?
All 1N5369A/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5369A/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 1N5369A/TR12 part is unused and in its original packaging.
Return procedure for 1N5369A/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5369A/TR12 Tags
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