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Microchip Technology 1N5280A
- Part No.:
- 1N5280A
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5280A.pdf
- Description:
- DIODE ZENER 190V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:3,228
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Product details
Overview
1N5280A from Microsemi is a 190 V, ±10% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 0.66 mA test current and 10 μA maximum reverse leakage at 152 V, used for precision voltage reference and overvoltage protection in industrial power supplies and analog signal conditioning circuits.
For engineers reviewing the 1N5280A datasheet, 1N5280A pinout, 1N5280A application, or 1N5280A equivalent, this page delivers verified electrical parameters, thermal derating behavior, Zener impedance at knee current, temperature coefficient, and RoHS-compliant packaging options per Microsemi Scottsdale Division documentation.
Technical Context
This device operates as a two-terminal voltage reference with sharp breakdown knee at 190 V, exhibiting 6500 Ω dynamic impedance at IZK = 0.25 mA and 10 μA IR at VR = 152 V. Its temperature coefficient is +0.110 %/°C, measured at rated IZT across 25–125 °C.
The 1N5280A uses hermetically sealed glass construction with tin-lead or RoHS-compliant matte-tin plating, supports 260 °C soldering for 10 s, and maintains stable regulation from –65 °C to +175 °C with junction-to-lead thermal resistance of 250 °C/W at 3/8″ lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 190 V at 0.66 mA test current - defines primary regulation point under standard bias |
| Zener Tolerance | ±10% (A suffix) - sets absolute output voltage window: 171 V to 209 V at 25 °C |
| Power Dissipation | 500 mW at 25 °C ambient - limits continuous DC power handling before thermal derating |
| Zener Impedance | 6500 Ω at IZK = 0.25 mA - indicates high dynamic resistance near knee, suitable for low-current reference use |
| Reverse Leakage | 10 μA max at VR = 152 V - confirms low off-state conduction below breakdown threshold |
| Temp. Coefficient | +0.110 %/°C - quantifies positive drift rate; requires compensation in high-stability designs |
| Operating Temp. | –65 °C to +175 °C - enables deployment in aerospace, downhole, and military environments |
Pinout & Package
DO-35 (DO-204AH) glass axial-leaded package with cathode indicated by color band; banded end must be held positive relative to anode for Zener operation. Hermetically sealed, 0.2 g mass, tin-lead or RoHS-compliant matte-tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; reverse-biased current flows from cathode to anode during regulation |
| Cathode | Regulated output node | Banded end; held at stable 190 V above anode when reverse current ≥ 0.66 mA |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with JEDEC 1N52xx standard for voltage regulation and interchangeability |
| Radiation-hardened | Inherently radiation tolerant per MicroNote 050 - suitable for space-grade analog references |
| ESD-insensitive | No special handling required per MIL-STD-750 Method 1020 - simplifies manufacturing flow |
| Low capacitance | Typical <1.5 pF (per Figure 2) - minimizes AC coupling in high-frequency voltage clamp applications |
| RoHS option | e3 suffix available - meets EU RoHS Directive 2011/65/EU with annealed matte-tin plating |
Applications
| Industrial Power Supply Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stable 190 V reference for feedback loop in isolated 200 V DC-DC converter. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference providing error-signal baseline for TL431 or optocoupler-based regulation. Use Value: Maintains ±10% output accuracy over –40 °C to +85 °C with no active components or trimming required. |
Use Scenario: Transient suppression on 160 V bus against lightning-induced surges. IC Role / Device Role / Timing Role: Passive shunt clamp that conducts only above 190 V, diverting excess energy to ground. Use Value: Limits peak voltage to ≤209 V (190 V +10%) without crowbarring, preserving downstream MOSFET gate integrity. |
| Analog Signal Conditioning | Aerospace Sensor Biasing |
Use Scenario: Precision biasing of high-voltage op-amp input stage in 180 V data acquisition front-end. IC Role / Device Role / Timing Role: Fixed reference source for offset nulling and gain calibration in rail-to-rail amplifiers. Use Value: Delivers stable 190 V reference with <10 μA leakage, minimizing input bias current error in µV-level measurements. |
Use Scenario: Voltage stabilization for radiation-tolerant pressure transducer in satellite telemetry module. IC Role / Device Role / Timing Role: Primary reference element in unregulated 200 V supply chain where active regulators are prohibited. Use Value: Operates reliably from –65 °C to +175 °C and withstands total ionizing dose >100 krad(Si), per MicroNote 050. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5280B | ±5% tolerance (vs. ±10% for 1N5280A); same VZ, IZT, and package | Higher initial accuracy required for closed-loop feedback systems | Select 1N5280B when tighter regulation tolerance is needed without changing layout or thermal design |
| MMBZ5280AL | SOT-23 surface-mount package; 190 V, ±10%, 225 mW rating (vs. 500 mW) | Space-constrained PCBs where axial leads are incompatible with automated assembly | Choose MMBZ5280AL only if board area and reflow compatibility outweigh power derating and thermal margin loss |
Compared with 1N5280B and MMBZ5280AL, the 1N5280A offers optimal balance of cost, power handling, and legacy through-hole compatibility for industrial power reference designs requiring ±10% tolerance.
Availability
1N5280A is available at Aetrix Electronics and suitable for industrial power supply reference, overvoltage protection clamp, and aerospace sensor biasing applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 1N5280A 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 radiation-hardened components for defense, aerospace, and industrial markets.
The 1N52xx series was designed specifically for precision voltage regulation in harsh-environment applications where stability, wide temperature range, and hermetic sealing are critical - not general-purpose clamping.
FAQ
What is the nominal Zener voltage and test current for the 1N5280A?
The 1N5280A has a nominal Zener voltage of 190 V measured at a test current (IZT) of 0.66 mA. This value is guaranteed within ±10% tolerance at 25 °C per Microsemi's published electrical characteristics table. The 1N5280A must be biased above this current to ensure stable regulation, and its dynamic impedance rises significantly below 0.25 mA.
Does the 1N5280A have a specified Zener impedance, and at what condition?
Yes, the 1N5280A specifies a maximum Zener impedance (ZZK) of 6500 Ω at IZK = 0.25 mA. This value reflects dynamic resistance near the knee of the breakdown curve and is critical for evaluating regulation stability under light-load conditions. It is distinct from ZZT, which is not specified for the 1N5280A in the provided data.
What is the maximum reverse leakage current for the 1N5280A, and at what voltage is it measured?
The 1N5280A has a maximum reverse leakage current (IR) of 10 μA, measured at VR = 152 V - 80% of its nominal 190 V Zener voltage. This parameter ensures minimal off-state conduction in clamp or reference configurations where leakage could affect system accuracy or power budget.
Is the 1N5280A RoHS compliant, and how is compliance indicated?
Yes, RoHS-compliant versions of the 1N5280A are available with the "e3" suffix (e.g., 1N5280Ae3), featuring annealed matte-tin plating per MIL-STD-750 Method 2026. Standard 1N5280A units use tin-lead plating unless otherwise specified; the e3 designation confirms full compliance with EU Directive 2011/65/EU.
What is the operating temperature range and thermal resistance of the 1N5280A?
The 1N5280A operates from –65 °C to +175 °C and has a junction-to-lead thermal resistance of 250 °C/W at 3/8″ (10 mm) lead length from the glass body. When mounted on FR4 with specified copper pads, its junction-to-ambient resistance is 310 °C/W - critical for calculating safe power dissipation at elevated ambient temperatures.
1N5280A 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):
- 190 V
- Tolerance:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 2400 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)
1N5280A FAQ
1.How can I place an order for 1N5280A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5280A 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 1N5280A reliable?
The price and inventory of 1N5280A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5280A is usually 5 days.
3.What payment methods are accepted for 1N5280A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5280A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5280A?
1N5280A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5280A 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 1N5280A?
For technical support, including 1N5280A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5280A requirements.
6.How does Aetrix verify that 1N5280A is sourced from the original manufacturer or authorized distributors?
All 1N5280A 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 1N5280A meets industry standards.
7.What is the process for return or replacement of 1N5280A?
All 1N5280A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5280A, 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 1N5280A part is unused and in its original packaging.
Return procedure for 1N5280A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5280A Tags
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MMBZ5240B-7-F
Diodes Incorporated
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