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Microchip Technology 1N5277A/TR
- Part No.:
- 1N5277A/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5277A/TR.pdf
- Description:
- DIODE ZENER 160V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:2,572
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Product details
Overview
1N5277A/TR from Microsemi is a 160 V, ±10% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, tested at 0.80 mA Zener current with 1700 Ω dynamic impedance and 10 μA maximum reverse leakage at 128 V, used for precision voltage reference and overvoltage protection in industrial power supplies.
For engineers reviewing the 1N5277A/TR datasheet, 1N5277A/TR pinout, 1N5277A/TR application, or 1N5277A/TR equivalent, key selection criteria include Zener voltage stability across temperature, low capacitance (<2 pF), radiation-hardened construction, and RoHS-compliant tin plating with tape-and-reel packaging.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage regulation across wide current (0.25–0.80 mA) and temperature (−65°C to +175°C) ranges. Its 1700 Ω dynamic impedance at IZK = 0.25 mA and 10 μA IR @ VR = 128 V define its regulation sharpness and leakage behavior under bias.
The device uses hermetically sealed glass DO-35 construction with cathode band marking, tin-lead or RoHS matte-tin plating, and is rated for 260°C soldering (10 s). It exhibits +0.110 %/°C temperature coefficient above 100 V, per JEDEC 1N52xx series specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 160 V @ IZT = 0.80 mA - defines regulated output voltage under standard test condition |
| Zener Tolerance | ±10% (A suffix) - ensures voltage falls within 144–176 V at 25°C for production consistency |
| Power Dissipation | 500 mW at 25°C - sets maximum continuous thermal load before derating begins |
| Zener Impedance | 1700 Ω @ IZK = 0.25 mA - indicates slope resistance near knee; impacts regulation accuracy under light load |
| Reverse Leakage | 10 μA max @ VR = 128 V - determines standby power loss and noise floor in high-impedance circuits |
| Temp. Coefficient | +0.110 %/°C - quantifies voltage drift per degree rise; critical for high-temp industrial designs |
| Package | DO-35 (DO-204AH) glass axial-leaded - enables through-hole mounting with 0.2 g mass and 250 °C/W junction-to-lead thermal resistance |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode indicated by single black band; leads are tin-lead or RoHS matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Banded end | Connected to regulated voltage node; must be held positive relative to anode for breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| Radiation hardness | Inherently radiation hard per MicroNote 050 - supports aerospace and nuclear instrumentation use without additional shielding |
| ESD immunity | Nonsensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling and assembly |
| Capacitance | Typical <2 pF (per Figure 2) - minimizes signal coupling and high-frequency loading in RF bias networks |
| Thermal performance | 250 °C/W junction-to-lead (3/8″ lead length) - enables reliable operation in compact, high-density PCB layouts |
| Screening options | MIL-PRF-19500 JAN/JANTXV available with MQ/MV prefix + "-1" suffix - meets defense-grade reliability requirements |
Applications
| Industrial Power Supply Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stable 160 V reference for feedback loop in 200 V DC-DC converter with wide ambient temperature range. IC Role / Device Role / Timing Role: Voltage reference element providing precise regulation point for error amplifier input. Use Value: ±10% tolerance and +0.110 %/°C TC ensure output stays within 155–165 V across −40°C to +85°C operating range. | Use Scenario: Clamp circuit protecting downstream 150 V-rated MOSFET gate driver from transient surges. IC Role / Device Role / Timing Role: Shunt overvoltage protector diverting excess energy when input exceeds 160 V threshold. Use Value: 500 mW power rating and 1700 Ω Zz allow safe clamping of 300 ms transients up to 1.2 A peak current. |
| High-Temperature Sensor Biasing | Radiation-Hardened Instrumentation |
Use Scenario: Biasing network for silicon carbide temperature sensor in oil-well downhole electronics (175°C ambient). IC Role / Device Role / Timing Role: Stable voltage source for constant-current excitation of sensor bridge. Use Value: −65°C to +175°C operating range and inherent radiation hardness eliminate derating or shielding overhead. | Use Scenario: Voltage reference in satellite telemetry module exposed to total ionizing dose >100 krad(Si). IC Role / Device Role / Timing Role: Primary regulation node requiring long-term parametric stability under radiation exposure. Use Value: Inherent radiation hardness per MicroNote 050 avoids qualification testing delays and part obsolescence risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5277B/TR | ±5% tolerance (vs. ±10% for 1N5277A/TR); same VZ, IZT, ZZT, and package | Higher precision required where 160 V must stay within 152–168 V across full temp range | Select 1N5277B/TR when tighter initial tolerance justifies cost premium and thermal drift remains acceptable |
| MMBZ5277B-TP | Surface-mount SOD-123 package; 160 V, ±5%, 225 mW Pd, 1500 Ω Zz @ 0.25 mA | Space-constrained PCBs where axial DO-35 footprint is prohibitive | Choose MMBZ5277B-TP only if board layout allows SMT placement and 225 mW derating is acceptable |
Compared with 1N5277A/TR, the 1N5277B/TR offers improved initial accuracy but identical thermal behavior, while the MMBZ5277B-TP trades power rating and through-hole compatibility for miniaturization-neither is pin-compatible due to differing packages and mounting methods.
Availability
1N5277A/TR is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, high-temperature sensor biasing, and radiation-hardened instrumentation requiring stable component supply and traceable sourcing.
Supply support for 1N5277A/TR 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 1N52xx series was designed as a JEDEC-registered family of general-purpose, high-stability Zener diodes targeting voltage reference, regulation, and protection in harsh-environment systems.
FAQ
What is the nominal Zener voltage and test current for the 1N5277A/TR?
The 1N5277A/TR has a nominal Zener voltage of 160 V measured at a test current (IZT) of 0.80 mA. This value is guaranteed within ±10% tolerance at 25°C per the A-suffix specification. The 1N5277A/TR datasheet confirms this parameter in the Electrical Characteristics table on page 2, alongside corresponding Zener impedance and leakage data.
Does the 1N5277A/TR have radiation-hardened properties?
Yes, the 1N5277A/TR is inherently radiation hard per MicroNote 050, a documented characteristic of the entire 1N52xx DO-35 Zener series. This property is not dependent on screening level and applies to all variants including the standard 1N5277A/TR, making it suitable for space and nuclear applications without additional qualification.
What is the maximum reverse leakage current for the 1N5277A/TR and at what voltage is it specified?
The 1N5277A/TR has a maximum reverse leakage current (IR) of 10 μA at VR = 128 V, as specified in the Electrical Characteristics table. This value is consistent across A-, B-, C-, and D-suffix parts in the 1N5276–1N5281 range and reflects the device's ability to hold off voltage below breakdown with minimal standby current.
Is the 1N5277A/TR RoHS compliant?
Yes, the 1N5277A/TR is RoHS compliant when ordered with the "e3" suffix (e.g., 1N5277Ae3/TR). The base part number without "e3" uses traditional tin-lead plating; however, RoHS-compliant matte-tin plating is available per MIL-STD-750 Method 2026 and noted in the Mechanical and Packaging section of the datasheet.
What is the thermal resistance and power derating behavior of the 1N5277A/TR?
The 1N5277A/TR has a junction-to-lead thermal resistance of 250 °C/W at 3/8″ (10 mm) lead length, and steady-state power drops to 0.48 W at TA < 25°C on FR4 board. Derating follows the curve in Figure 1: power linearly decreases to zero at 175°C ambient, enabling reliable operation in high-temp industrial enclosures.
1N5277A/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 160 V
- Tolerance:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 1.7 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 116 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N5277A/TR FAQ
1.How can I place an order for 1N5277A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5277A/TR 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 1N5277A/TR reliable?
The price and inventory of 1N5277A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5277A/TR is usually 5 days.
3.What payment methods are accepted for 1N5277A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5277A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5277A/TR?
1N5277A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5277A/TR 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 1N5277A/TR?
For technical support, including 1N5277A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5277A/TR requirements.
6.How does Aetrix verify that 1N5277A/TR is sourced from the original manufacturer or authorized distributors?
All 1N5277A/TR 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 1N5277A/TR meets industry standards.
7.What is the process for return or replacement of 1N5277A/TR?
All 1N5277A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5277A/TR, 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 1N5277A/TR part is unused and in its original packaging.
Return procedure for 1N5277A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5277A/TR Tags
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