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Microchip Technology 1N5277B
- Part No.:
- 1N5277B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5277B.pdf
- Description:
- DIODE ZENER 160V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:6,870
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Product details
Overview
1N5277B from Microsemi is a 160 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 0.80 mA test current, 1700 Ω dynamic impedance at 0.25 mA, and operating from –65°C to +175°C. It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits, power supply feedback paths, and industrial sensor conditioning stages.
For engineers reviewing the 1N5277B datasheet, 1N5277B pinout, 1N5277B application, or 1N5277B equivalent, key selection criteria include its 160 V nominal Zener voltage, tight ±5% tolerance (B suffix), low 0.1 μA maximum reverse leakage at 128 V, and radiation-hardened glass-body construction suitable for high-reliability embedded systems.
Technical Context
The 1N5277B operates as a two-terminal voltage reference diode with cathode-banded polarity, requiring reverse bias for Zener regulation. Its breakdown knee is stabilized by internal diffusion design and validated per JEDEC 1N52xxB specifications, ensuring predictable conduction above 160 V with minimal temperature drift (+0.110 %/°C).
It exhibits inherently low junction capacitance (≈1.5 pF typical at 0 V, per Figure 2), enabling stable performance in high-frequency noise suppression and transient clamping. Thermal resistance is 250 °C/W junction-to-lead (3/8″ lead length), supporting reliable operation under pulsed or continuous DC bias up to 0.5 W at 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 160 V @ 0.80 mA test current - defines precise regulation point for feedback or reference use |
| Zener Tolerance | ±5% (B suffix) - ensures voltage accuracy within ±8 V across production lots |
| Power Dissipation | 500 mW at 25 °C - sets maximum continuous DC power handling before thermal derating |
| Dynamic Impedance | 1700 Ω @ IZK = 0.25 mA - indicates voltage stability under small-signal variations |
| Reverse Leakage | 0.1 μA max @ VR = 128 V - guarantees minimal quiescent current in standby or high-impedance nodes |
| Temp. Coefficient | +0.110 %/°C - quantifies voltage drift over –65°C to +175°C operating range |
| Package | DO-35 (DO-204AH) glass axial-leaded - enables through-hole mounting with hermetic seal and ESD immunity |
Pinout & Package
DO-35 (DO-204AH) glass axial-leaded package: hermetically sealed cylindrical body with tin-lead or RoHS-compliant matte-tin plating; cathode indicated by single black band; weight 0.2 g; mechanical dimensions per Microsemi Rev D drawing.
| 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 |
|---|---|
| JEDEC-registered 1N52xxB series compliance | Guarantees full parameter validation (VZ, IR, ZZT, ZZK, αVZ, VF) per industry standard |
| Radiation-hardened construction | Inherent hardness per MicroNote 050 supports aerospace and downhole electronics |
| Nonsensitive to ESD | Qualified to MIL-STD-750 Method 1020 - eliminates need for external ESD protection |
| Minimal junction capacitance | ~1.5 pF typical (Figure 2) - preserves signal integrity in RF-coupled or fast-transient applications |
| Wide temperature range | –65°C to +175°C operation - enables deployment in automotive engine bays and industrial motor controls |
Applications
| Industrial Power Supply Feedback | High-Voltage Sensor Reference |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler feedback loops. IC Role / Device Role / Timing Role: Zener reference providing stable 160 V threshold to TL431 or optocoupler LED drive circuit. Use Value: Enables accurate ±5% output regulation despite line/load variation and transformer leakage. |
Use Scenario: Providing fixed bias voltage for piezoresistive pressure transducers in oilfield instrumentation. IC Role / Device Role / Timing Role: Precision voltage reference stabilizing bridge excitation in harsh-temperature environments. Use Value: Maintains measurement accuracy over –40°C to +150°C due to low tempco and radiation tolerance. |
| Overvoltage Clamp for Analog Inputs | Legacy System Voltage Monitoring |
Use Scenario: Protecting ADC inputs in PLC analog modules against 200 V transients on 24 V field wiring. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting input voltage to safe levels during surge events. Use Value: Low 0.1 μA leakage prevents loading of high-impedance sensor signals during normal operation. |
Use Scenario: Detecting brownout conditions in legacy telecom shelf controllers using discrete comparator circuits. IC Role / Device Role / Timing Role: Stable 160 V reference setting trip threshold for undervoltage lockout logic. Use Value: Guaranteed ±5% tolerance ensures consistent detection across manufacturing batches and temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5277A | ±10% tolerance (vs. ±5% for 1N5277B); otherwise identical electrical specs and package | Acceptable where cost sensitivity outweighs voltage accuracy requirements | Select 1N5277A only when ±10% regulation error is permissible in feedback or monitoring circuits |
| MMBZ5277B | Surface-mount SOT-23 package; same 160 V/±5% spec but higher thermal resistance (350 °C/W) | Used in space-constrained PCBs where axial-leaded mounting is impractical | Choose MMBZ5277B only when board real estate limits DO-35 placement and thermal management allows |
Compared with 1N5277A and MMBZ5277B, the 1N5277B delivers tighter voltage accuracy in a robust through-hole package optimized for thermal reliability and high-temperature operation-making it preferred for industrial power and sensing applications demanding long-term stability.
Availability
1N5277B is available at Aetrix Electronics and suitable for industrial power supply feedback, high-voltage sensor reference, and overvoltage clamp applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N5277B 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 1N52xxB series was designed specifically for precision voltage regulation in mission-critical systems where radiation tolerance, wide temperature operation, and JEDEC-validated parametric consistency are mandatory.
FAQ
What is the nominal Zener voltage and test current for the 1N5277B?
The 1N5277B has a nominal Zener voltage of 160 V measured at a test current (IZT) of 0.80 mA. This value is guaranteed within ±5% tolerance per the B suffix designation and is validated under JEDEC 1N52xxB specifications with 20-second thermal stabilization prior to measurement.
Does the 1N5277B have radiation-hardened characteristics?
Yes, the 1N5277B exhibits inherent radiation hardness per MicroNote 050, a documented characteristic of Microsemi's DO-35 Zener process. This makes the 1N5277B suitable for deployment in aerospace, nuclear instrumentation, and downhole oilfield electronics where total ionizing dose (TID) resilience is required.
What is the maximum reverse leakage current specification for the 1N5277B?
The 1N5277B specifies a maximum reverse leakage current (IR) of 0.1 μA at VR = 128 V. This low leakage ensures minimal parasitic loading in high-impedance reference or monitoring circuits, preserving signal fidelity and reducing power loss in battery-powered or energy-sensitive designs.
Can the 1N5277B be used in surface-mount designs?
No-the 1N5277B is exclusively packaged in the axial-leaded DO-35 (DO-204AH) glass body. For surface-mount equivalents, Microsemi offers the MMBZ5277B in SOT-23, which shares the same 160 V/±5% rating but differs in thermal resistance and mounting method.
What is the temperature coefficient of the 1N5277B, and how is it measured?
The 1N5277B has a temperature coefficient (αVZ) of +0.110 %/°C, measured between 25 °C and 125 °C at its rated IZT. This value reflects the average voltage drift rate over that interval and is specified for all 1N5276–1N5281B devices per Note 3 in the datasheet.
1N5277B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 160 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 1700 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 122 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N5277B FAQ
1.How can I place an order for 1N5277B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5277B 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 1N5277B reliable?
The price and inventory of 1N5277B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5277B is usually 5 days.
3.What payment methods are accepted for 1N5277B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5277B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5277B?
1N5277B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5277B 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 1N5277B?
For technical support, including 1N5277B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5277B requirements.
6.How does Aetrix verify that 1N5277B is sourced from the original manufacturer or authorized distributors?
All 1N5277B 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 1N5277B meets industry standards.
7.What is the process for return or replacement of 1N5277B?
All 1N5277B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5277B, 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 1N5277B part is unused and in its original packaging.
Return procedure for 1N5277B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5277B Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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