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Microchip Technology 1N5273B/TR
- Part No.:
- 1N5273B/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5273B/TR.pdf
- Description:
- DIODE ZENER 120V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:8,098
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Product details
Overview
1N5273B/TR from Microsemi is a 500 mW glass axial-lead Zener diode with nominal Zener voltage of 120 V, ±5% tolerance (B suffix), 1.0 mA test current, and 4000 Ω maximum Zener impedance at 0.25 mA. It operates from –65°C to +175°C and regulates voltage in low-current reference and protection circuits.
For engineers reviewing the 1N5273B/TR datasheet, 1N5273B/TR pinout, 1N5273B/TR application, or 1N5273B/TR equivalent, this part serves as a precision voltage reference in power supply feedback, overvoltage clamping, and analog signal conditioning where stable high-voltage regulation under low bias is required.
Technical Context
The 1N5273B/TR is a single-junction, silicon planar Zener diode operating in reverse breakdown mode. Its regulation relies on controlled avalanche mechanism above ~7 V, confirmed by its positive temperature coefficient (+0.110 %/°C) and high Zener impedance typical for 120 V devices.
It features hermetically sealed DO-35 (DO-204AH) glass package with tin-lead or RoHS-compliant matte-tin plating, cathode band marking, and axial-leaded mechanical mounting. Thermal resistance is 250 °C/W junction-to-lead at 10 mm lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 120 V @ 1.0 mA - defines precise regulation point for feedback or clamp circuits |
| Zener Tolerance | ±5% (B suffix) - ensures predictable voltage window without binning |
| Power Dissipation | 500 mW at 25°C - supports stable operation in compact through-hole designs |
| Zener Impedance | 4000 Ω max @ 0.25 mA - indicates higher dynamic resistance suitable for low-current references, not fast transient suppression |
| Temp. Coefficient | +0.110 %/°C - enables predictable drift compensation in wide-temperature industrial environments |
| Max Reverse Current | 10 μA @ 99 V - confirms low leakage below regulation threshold, critical for standby power integrity |
| Operating Temp. | –65°C to +175°C - validated for aerospace, downhole, and high-reliability embedded systems |
Pinout & Package
Package: DO-35 (DO-204AH), hermetically sealed glass axial-leaded case with cathode band marking. Leads are tinned copper alloy, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased reference terminal | Connected to lower-potential node; forms regulated output when cathode is biased higher |
| Cathode | Zener voltage reference terminal | Banded end; connected to higher-potential node; defines 120 V drop relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N52xxB series | Guarantees full six-parameter electrical specification compliance (VZ, IR, ZZT, ZZK, αVZ, VF), unlike generic JEDEC-only parts |
| RoHS-compliant option (e3 suffix) | Enables compliance with environmental directives without performance trade-off or requalification |
| Hermetic glass DO-35 package | Provides long-term reliability and moisture resistance in harsh environments, unlike plastic-packaged Zeners |
| Radiation-hardened design | Inherently radiation-tolerant per MicroNote 050 - suitable for space-qualified and nuclear instrumentation applications |
| Nonsensitive to ESD | Withstands MIL-STD-750 Method 1020 testing - eliminates need for external ESD protection in handling and assembly |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converter feedback loops using optocoupler-coupled TL431 alternatives. IC Role / Device Role / Timing Role: Primary voltage reference element establishing 120 V threshold for error amplifier input. Use Value: Enables accurate 120 V regulation with ±5% tolerance and minimal thermal drift (+0.110 %/°C), reducing need for trimming. | Use Scenario: Protecting downstream circuitry from transient surges exceeding 120 V in industrial sensor interfaces or motor drive control boards. IC Role / Device Role / Timing Role: Passive shunt clamp absorbing excess energy during overvoltage events. Use Value: Provides robust clamping at precisely 120 V with low leakage (<10 μA @ 99 V), minimizing standby power loss. |
| Analog Signal Level Shifting | High-Voltage Bias Generation |
Use Scenario: Establishing fixed 120 V bias for photomultiplier tube (PMT) dynode chains or high-gain op-amp stages. IC Role / Device Role / Timing Role: Stable DC bias source delivering low-noise, temperature-compensated voltage. Use Value: Delivers 120 V reference with 4000 Ω Zener impedance-sufficient for microamp-level bias currents without significant droop. | Use Scenario: Generating calibrated high-voltage rails in test equipment, NMR preamplifiers, or vacuum tube heater supplies. IC Role / Device Role / Timing Role: Precision voltage reference defining rail accuracy in multi-stage DC-DC converters. Use Value: Supports operation up to +175°C and down to –65°C, enabling use in oil & gas downhole tools and avionics power modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5273C/TR | ±2% tolerance (C suffix) vs. ±5% (B); same 120 V nominal, 1.0 mA IZT, DO-35 package | Higher precision required in metrology-grade references or closed-loop calibration circuits | Select 1N5273C/TR when tighter initial accuracy justifies cost premium and thermal drift compensation is implemented externally |
| 1N5273A/TR | ±10% tolerance (A suffix); otherwise identical electrical and mechanical specs | Cost-sensitive applications where coarse voltage setting suffices (e.g., non-critical bias, rough clamping) | Choose 1N5273A/TR for prototyping or legacy designs where ±10% margin is acceptable and BOM cost reduction is prioritized |
Compared with 1N5273C/TR and 1N5273A/TR, the 1N5273B/TR delivers optimal balance of accuracy, cost, and qualification-making it the default choice for production-grade industrial power and protection circuits requiring verified ±5% regulation without overspecifying tolerance.
Availability
1N5273B/TR is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage clamp protection, and high-voltage bias generation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N5273B/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, radiation-hardened, and high-voltage analog components for aerospace, defense, and industrial markets.
The 1N52xxB series was designed specifically for mission-critical voltage reference and protection applications demanding guaranteed six-parameter specifications, hermetic packaging, and extreme temperature resilience.
FAQ
What is the Zener voltage tolerance of the 1N5273B/TR?
The 1N5273B/TR has a nominal Zener voltage of 120 V with a guaranteed tolerance of ±5%, indicated by the "B" suffix per Microsemi's documentation. This tolerance applies across the full operating temperature range and is verified under JEDEC-compliant test conditions with full six-parameter specification coverage.
Does the 1N5273B/TR require derating above 25°C?
Yes, the 1N5273B/TR must be derated linearly above 25°C ambient or lead temperature. Its thermal resistance is 250 °C/W junction-to-lead, so power dissipation decreases to zero at 175°C. Derating follows the curve in Figure 1 of the Microsemi datasheet, ensuring safe operation within its –65°C to +175°C rating.
Is the 1N5273B/TR RoHS compliant?
The standard 1N5273B/TR uses tin-lead plating, but RoHS-compliant versions are available with the "e3" suffix (e.g., 1N5273B-e3/TR). The "e3" designation confirms annealed matte-tin plating meeting J-STD-609 and RoHS Directive 2011/65/EU requirements without altering electrical or thermal performance.
What is the maximum Zener impedance of the 1N5273B/TR and at what condition?
The 1N5273B/TR has a maximum Zener impedance of 4000 Ω, measured at 0.25 mA (IZK) per Note 2 in the Microsemi datasheet. This value reflects dynamic impedance near the knee of the breakdown curve and is critical for evaluating regulation stability in low-current reference applications.
Can the 1N5273B/TR be used in place of a 1N5273A/TR or 1N5273C/TR?
The 1N5273B/TR shares identical package, pinout, and nominal voltage with 1N5273A/TR and 1N5273C/TR, differing only in tolerance (±5% vs. ±10% or ±2%). It is electrically interchangeable in circuits where ±5% accuracy meets design margins, but substitution requires verification of tolerance impact on system-level regulation or clamping thresholds.
1N5273B/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):
- 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/TR FAQ
1.How can I place an order for 1N5273B/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5273B/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 1N5273B/TR reliable?
The price and inventory of 1N5273B/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5273B/TR is usually 5 days.
3.What payment methods are accepted for 1N5273B/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5273B/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5273B/TR?
1N5273B/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5273B/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 1N5273B/TR?
For technical support, including 1N5273B/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5273B/TR requirements.
6.How does Aetrix verify that 1N5273B/TR is sourced from the original manufacturer or authorized distributors?
All 1N5273B/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 1N5273B/TR meets industry standards.
7.What is the process for return or replacement of 1N5273B/TR?
All 1N5273B/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5273B/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 1N5273B/TR part is unused and in its original packaging.
Return procedure for 1N5273B/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5273B/TR Tags
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MM5Z5V1ST1G
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