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Microchip Technology 1N5273B
- Part No.:
- 1N5273B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5273B.pdf
- Description:
- DIODE ZENER 120V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:9,067
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Product details
Overview
1N5273B from Microsemi is a 120 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 1 mA test current and 900 Ω dynamic impedance at 0.25 mA, operating from –65°C to +175°C. It serves as a precision voltage reference or overvoltage clamp in high-temperature industrial power supplies and aerospace sensor conditioning circuits.
For engineers reviewing the 1N5273B datasheet, 1N5273B pinout, 1N5273B application, or 1N5273B equivalent, key selection criteria include its 120 V nominal Zener voltage, ±5% tolerance (B suffix), 900 Ω Zener impedance at IZK = 0.25 mA, temperature coefficient of +0.110 %/°C, and DO-35 hermetic glass package with cathode band marking.
Technical Context
This discrete Zener diode operates in reverse breakdown mode with a sharp knee at 120 V, stabilized by internal diffusion-controlled junction design. Its 900 Ω impedance at 0.25 mA ensures predictable regulation under low-current biasing typical in reference divider networks.
The device exhibits +0.110 %/°C temperature coefficient above 6.8 V, confirmed per JEDEC test conditions (IZT = rated value, T1 = 25°C, T2 = 125°C), and maintains stable regulation across –65°C to +175°C due to hermetically sealed glass construction and radiation-hardened process.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 120 V @ IZT = 1 mA - defines precise clamping/reference level in high-voltage feedback loops |
| Zener Tolerance | ±5% (B suffix) - guarantees voltage accuracy within 114–126 V at 25°C for calibration-critical designs |
| Zener Impedance | 900 Ω @ IZK = 0.25 mA - indicates moderate dynamic resistance suitable for low-power reference buffering |
| Power Dissipation | 500 mW at 25°C - supports continuous operation up to 4.17 mA at 120 V before thermal derating begins |
| Operating Temperature | –65°C to +175°C - enables deployment in downhole, avionics, and military-grade power systems |
| Thermal Resistance | 250 °C/W junction-to-lead - requires ≥10 mm lead length from body for full 500 mW rating |
| Temp. Coefficient | +0.110 %/°C - quantifies voltage drift of +0.132 V/°C at 120 V, critical for wide-temp stability analysis |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode indicated by a single black band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased input terminal | Connected to lower-potential node; accepts current during Zener conduction |
| Cathode | Regulated output terminal | Banded end; provides stable 120 V reference relative to anode when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N52xxB series | Guarantees full six-parameter specification compliance (VZ, IR, VF, ZZT, ZZK, αVZ) per MIL-PRF-19500 |
| Hermetic glass DO-35 package | Enables operation at +175°C and inherent radiation hardness per MicroNote 050 |
| Nonsensitive to ESD | Qualified to MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling |
| Minimal capacitance | Typical <2 pF - preserves high-frequency signal integrity in RF bias and timing circuits |
| RoHS-compliant option | e3 suffix available - meets environmental compliance without performance trade-off |
Applications
| High-Voltage Power Supply Reference | Aerospace Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing feedback voltage in 150–200 V DC-DC converter secondary-side regulation. IC Role / Device Role / Timing Role: Zener reference element providing fixed 120 V threshold for optocoupler-driven error amplification. Use Value: Enables ±5% output regulation over line/load/temperature with no active components in the reference path. | Use Scenario: Biasing piezoresistive pressure transducers in jet engine monitoring systems. IC Role / Device Role / Timing Role: High-stability voltage clamp protecting amplifier inputs from transient overvoltage events. Use Value: Survives –65°C to +175°C thermal cycling while maintaining 120 V clamping accuracy within 5%. |
| Military Grade Voltage Clamp | Industrial PLC Input Protection |
Use Scenario: Overvoltage suppression on 110 VAC-derived DC rails in ground vehicle control modules. IC Role / Device Role / Timing Role: Transient energy dissipation device shunting surge currents above 120 V. Use Value: Withstands 500 mW peak power and 10× surge current per MIL-STD-750, Test Method 2072. | Use Scenario: Input stage protection for analog I/O cards receiving 0–10 V signals in factory automation cabinets. IC Role / Device Role / Timing Role: Precision voltage limiter preventing ADC saturation during field-wiring faults. Use Value: 900 Ω Zener impedance ensures minimal loading on source impedance ≤1 kΩ while clamping at 120 V ±5%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4764A | 120 V, ±5%, 1 W DO-41 package; 10× higher power rating, larger footprint, 700 Ω ZZT @ 20 mA | Suitable for higher-current regulation (>10 mA); not qualified for >150°C operation | Select when board space allows DO-41 and thermal budget exceeds 500 mW |
| MMBZ5273B | 120 V, ±5%, 350 mW SOT-23 package; surface-mount, 1200 Ω ZZK @ 0.25 mA, –65°C to +150°C | Designed for automated assembly; lower max temperature and higher dynamic impedance limit high-reliability use | Select for space-constrained PCBs where hermeticity and 175°C rating are not required |
Compared with 1N5273B, 1N4764A offers higher power but lacks radiation hardness and extended temperature range, while MMBZ5273B trades hermetic reliability and thermal capability for SMT compatibility-making 1N5273B optimal for mission-critical high-temp environments.
Availability
1N5273B is available at Aetrix Electronics and suitable for high-reliability power supply reference, aerospace sensor conditioning, and military-grade voltage clamp applications requiring stable component supply across extended temperature and radiation-exposed environments.
Supply support for 1N5273B 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, radiation-hardened, and high-temperature analog and mixed-signal components.
The 1N52xxB series was designed specifically for military, aerospace, and industrial applications demanding guaranteed parametric performance, hermetic packaging, and operation beyond commercial temperature limits.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5273B?
The 1N5273B has a nominal Zener voltage of 120 V at 1 mA test current with a guaranteed ±5% tolerance (B suffix), meaning its actual breakdown voltage falls between 114 V and 126 V at 25°C per JEDEC-compliant testing.
Does the 1N5273B have a specified Zener impedance, and at what condition?
Yes, the 1N5273B has a maximum Zener impedance of 900 Ω measured at IZK = 0.25 mA, confirming stable regulation behavior near the knee of the breakdown curve-critical for low-current reference applications.
What is the maximum operating temperature range for the 1N5273B?
The 1N5273B is rated for continuous operation from –65°C to +175°C, enabled by its hermetically sealed DO-35 glass package and radiation-hardened silicon process-verified per MicroNote 050.
How is polarity marked on the 1N5273B, and how must it be biased?
The 1N5273B uses a single black band to mark the cathode terminal; for Zener regulation, the banded (cathode) end must be held positive relative to the anode-i.e., reverse-biased with current flowing into the cathode.
Is the 1N5273B RoHS compliant, and how is that indicated?
Yes, RoHS-compliant versions of the 1N5273B are available with the "e3" suffix (e.g., 1N5273Be3), featuring annealed matte-tin plating qualified per MIL-STD-750 Method 2026 and fully compliant with EU RoHS Directive 2011/65/EU.
1N5273B 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):
- 120 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 900 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 91 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)
1N5273B FAQ
1.How can I place an order for 1N5273B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5273B 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 1N5273B reliable?
The price and inventory of 1N5273B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5273B is usually 5 days.
3.What payment methods are accepted for 1N5273B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5273B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5273B?
1N5273B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5273B 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 1N5273B?
For technical support, including 1N5273B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5273B requirements.
6.How does Aetrix verify that 1N5273B is sourced from the original manufacturer or authorized distributors?
All 1N5273B 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 1N5273B meets industry standards.
7.What is the process for return or replacement of 1N5273B?
All 1N5273B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5273B, 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 1N5273B part is unused and in its original packaging.
Return procedure for 1N5273B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5273B Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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