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Microchip Technology 1N5281A/TR
- Part No.:
- 1N5281A/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5281A/TR.pdf
- Description:
- DIODE ZENER 200V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:3,487
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Product details
Overview
1N5281A/TR from Microsemi is a 200 V, ±10% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 0.65 mA test current and 7000 Ω dynamic impedance at 0.25 mA, operating from −65 °C to +175 °C - used for precision voltage reference and overvoltage protection in industrial power supplies.
For engineers reviewing the 1N5281A/TR datasheet, 1N5281A/TR pinout, 1N5281A/TR application, or 1N5281A/TR equivalent, key selection criteria include Zener voltage stability across temperature, low leakage (<10 μA at 160 V), hermetic glass packaging for reliability, and RoHS-compliant tin-lead plating with tape-and-reel (TR) delivery.
Technical Context
This device operates as a two-terminal voltage regulator in reverse-biased mode, with cathode identified by a band and requiring positive bias on the banded end. Its Zener breakdown exhibits a +0.110 %/°C temperature coefficient above 100 V, confirmed per Note 3 for 1N5243A/B through 1N5281A/B at IZT and 25 °C/125 °C.
It delivers stable regulation over wide current range (0.25 mA to 0.65 mA), with thermal resistance of 250 °C/W junction-to-lead (3/8″ lead length) and 310 °C/W junction-to-ambient on FR4. Forward voltage is ≤1.5 V at 200 mA, and it is nonsensitive to ESD per MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 200 V @ 0.65 mA - defines precise clamping threshold for high-voltage protection circuits |
| Zener Tolerance | ±10% (A suffix) - ensures predictable voltage margin for safety-critical overvoltage cutoff |
| Power Dissipation | 500 mW at 25 °C - supports continuous regulation in compact axial-leaded layouts without forced cooling |
| Zener Impedance | 7000 Ω @ 0.25 mA - indicates moderate dynamic response suitable for low-frequency reference, not fast transient suppression |
| Reverse Leakage | ≤10 μA @ 160 V - guarantees minimal standby current in always-on monitoring paths |
| Operating Temperature | −65 °C to +175 °C - enables deployment in aerospace, downhole, and under-hood automotive environments |
| Package | DO-35 (DO-204AH) glass axial-leaded - provides hermetic seal, radiation hardness, and compatibility with wave soldering at 260 °C/10 s |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with tin-lead or RoHS-compliant matte-tin plating; cathode indicated by single black band; weight 0.2 g; polarity critical - banded end must be anode for forward conduction, cathode for Zener regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node; reverse bias applied between cathode (banded) and this terminal to enable regulation |
| Cathode (banded end) | Zener regulation terminal / voltage clamp node | Connected to higher-potential rail; clamps voltage to 200 V ±10% when reverse current exceeds 0.25 mA |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass DO-35 construction | Enables operation up to +175 °C and inherent radiation hardness per MicroNote 050 |
| JEDEC-registered 1N52xx series | Guarantees standardized electrical limits (VZ, IR, VF) and mechanical interchangeability across manufacturers |
| RoHS-compliant "e3" option | Meets environmental compliance without performance trade-off; tin plating solderable per MIL-STD-750 Method 2026 |
| Tape-and-reel packaging ("TR" suffix) | Supports automated SMT placement despite axial form factor - compatible with EIA-296 standard feeders |
| Nonsensitive to ESD | Withstands human-body-model discharge without parameter shift - eliminates need for handling safeguards in assembly |
Applications
| Industrial Power Supply Reference | Aerospace Voltage Clamp |
|---|---|
Use Scenario: Stable 200 V reference in isolated DC-DC converter feedback loop for high-voltage output regulation. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference providing error-signal threshold for optocoupler-driven control IC. Use Value: ±10% tolerance and +0.110 %/°C TC ensure <±3% total drift over −40 °C to +85 °C ambient, meeting MIL-STD-704 input ripple rejection specs. |
Use Scenario: Overvoltage protection on 115 VAC-derived 160 VDC bus in satellite power distribution unit. IC Role / Device Role / Timing Role: Standby shunt regulator activated only during fault conditions exceeding 160 V. Use Value: Hermetic DO-35 package and −65 °C to +175 °C rating allow uninterrupted operation in vacuum and thermal cycling environments. |
| Downhole Sensor Biasing | Test Equipment Calibration Standard |
Use Scenario: Providing stable bias voltage to piezoresistive pressure transducers in oil-well logging tools. IC Role / Device Role / Timing Role: Low-leakage (≤10 μA) Zener reference maintaining accuracy under extreme temperature gradients. Use Value: Minimal capacitance (see Figure 2) and radiation-hardened structure prevent signal corruption in gamma-rich borehole environments. |
Use Scenario: Secondary voltage standard in portable multimeter calibration fixtures requiring traceable 200 V reference. IC Role / Device Role / Timing Role: Passive, non-drifting reference element replacing battery-powered active references in field service kits. Use Value: JEDEC registration and guaranteed VZ/IR/VF parameters support NIST-traceable calibration without recalibration drift over 2-year intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5281B/TR | ±5% tolerance (vs. ±10% for 1N5281A/TR); identical VZ, IZT, ZZK, thermal specs, and package | Used where tighter voltage margin is required for safety-critical shutdown thresholds | Select 1N5281B/TR when design requires <±10 V deviation at 200 V nominal; same footprint and thermal behavior |
| MMBZ5281B-TP | Surface-mount SOD-123 package; 200 V, ±5%, 225 mW Pd; higher ZZT (10 kΩ), lower IZT (0.25 mA) | Preferred for space-constrained PCBs where axial leads are incompatible with layout or automated assembly | Choose MMBZ5281B-TP only if board real estate or reflow-only assembly mandates SMT; derate power by 55% vs. 1N5281A/TR |
Compared with 1N5281B/TR and MMBZ5281B-TP, the 1N5281A/TR offers optimal balance of high-power capability (500 mW), hermetic reliability, and cost-effective axial-leaded manufacturability - making it preferred for ruggedized, high-temperature, or legacy-compatible designs where ±10% tolerance is acceptable.
Availability
1N5281A/TR is available at Aetrix Electronics and suitable for industrial power supply reference, aerospace voltage clamp, and downhole sensor biasing requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for 1N5281A/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N52xx series was designed specifically for demanding voltage regulation applications requiring hermetic packaging, wide temperature operation, and JEDEC-standardized interchangeability - targeting mission-critical systems where failure is not an option.
FAQ
What is the Zener voltage tolerance of the 1N5281A/TR?
The 1N5281A/TR has a nominal Zener voltage of 200 V with a guaranteed tolerance of ±10%, as indicated by the "A" suffix per Microsemi's documentation. This tolerance applies under standard test conditions (IZT = 0.65 mA, TA = 25 °C) and is verified across the full operating temperature range of −65 °C to +175 °C. The 1N5281A/TR does not meet tighter ±5% (B suffix) or ±1% (D suffix) tolerances.
Does the 1N5281A/TR have a specified Zener impedance at its test current?
Yes - the 1N5281A/TR has a maximum Zener impedance (ZZT) of 7000 Ω measured at IZK = 0.25 mA, per the Electrical Characteristics table on page 2 of the Microsemi datasheet. At the primary test current IZT = 0.65 mA, ZZT is not explicitly listed, but the 7000 Ω value at lower current confirms knee sharpness and stable regulation behavior essential for reference use.
Is the 1N5281A/TR RoHS compliant?
The base 1N5281A/TR is not inherently RoHS compliant; however, RoHS-compliant versions are available with the "e3" suffix (e.g., 1N5281Ae3/TR). These variants use annealed matte-tin plating instead of traditional tin-lead, meeting J-STD-609 Category 1 requirements while retaining identical electrical and thermal specifications, including 500 mW power rating and DO-35 packaging.
What is the maximum reverse leakage current for the 1N5281A/TR?
The 1N5281A/TR has a maximum reverse leakage current (IR) of 10 μA when tested at VR = 160 V, as specified in the Electrical Characteristics table. This value is guaranteed across the full operating temperature range and reflects the device's suitability for low-power bias networks where standby current must remain below microampere thresholds.
Can the 1N5281A/TR be used in surface-mount assemblies?
No - the 1N5281A/TR uses a DO-35 glass axial-leaded package and is intended for through-hole or axial mounting. For surface-mount equivalents, Microsemi offers the MLL5281B in DO-213AA (MELF) package, or third-party alternatives like MMBZ5281B-TP in SOD-123. Substituting 1N5281A/TR into SMT footprints requires mechanical adaptation and violates JEDEC mechanical standards.
1N5281A/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):
- 200 V
- Tolerance:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 2500 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 144 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)
1N5281A/TR FAQ
1.How can I place an order for 1N5281A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5281A/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 1N5281A/TR reliable?
The price and inventory of 1N5281A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5281A/TR is usually 5 days.
3.What payment methods are accepted for 1N5281A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5281A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5281A/TR?
1N5281A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5281A/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 1N5281A/TR?
For technical support, including 1N5281A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5281A/TR requirements.
6.How does Aetrix verify that 1N5281A/TR is sourced from the original manufacturer or authorized distributors?
All 1N5281A/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 1N5281A/TR meets industry standards.
7.What is the process for return or replacement of 1N5281A/TR?
All 1N5281A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5281A/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 1N5281A/TR part is unused and in its original packaging.
Return procedure for 1N5281A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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