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Microchip Technology 1N5254A
- Part No.:
- 1N5254A
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5254A.pdf
- Description:
- DIODE ZENER 27V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:4,062
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Product details
Overview
1N5254A from Microsemi is a 27 V, ±10% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 4.6 mA test current, 600 Ω dynamic impedance at IZK, and operating from –65°C to +175°C. It serves as a precision voltage reference or shunt regulator in low-power analog circuits, power supply feedback paths, and overvoltage protection.
For engineers reviewing the 1N5254A datasheet, 1N5254A pinout, 1N5254A application, or 1N5254A equivalent, key selection criteria include its 27 V nominal Zener voltage, ±10% tolerance (A suffix), 600 Ω Zener impedance at 0.25 mA, temperature coefficient of +0.090 %/°C, and DO-35 mechanical compatibility with axial-leaded through-hole PCB layouts.
Technical Context
This discrete Zener diode operates in reverse breakdown mode with cathode band indicating polarity, requiring the banded end to be held positive relative to the anode for regulation. Its 27 V nominal Zener voltage is specified at 4.6 mA test current (IZT), with dynamic impedance measured at both IZT and IZK = 0.25 mA.
The device exhibits a positive temperature coefficient of +0.090 %/°C (measured from 25°C to 125°C at rated IZT), and maintains stable regulation across –65°C to +175°C ambient range. Thermal resistance is 250 °C/W junction-to-lead at 3/8″ lead length, supporting reliable operation under derated power conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 27 V @ 4.6 mA - defines regulated output voltage under standard test condition |
| Zener Tolerance | ±10% (A suffix) - sets absolute voltage accuracy bound for design margining |
| Power Dissipation | 500 mW at 25°C - maximum steady-state power before thermal derating applies |
| Zener Impedance | 600 Ω @ IZK = 0.25 mA - indicates dynamic resistance near knee, critical for low-current stability |
| Temp. Coefficient | +0.090 %/°C - quantifies voltage drift with temperature, enabling compensation in precision references |
| Operating Temp. | –65°C to +175°C - supports aerospace, downhole, and high-reliability industrial environments |
| Reverse Current | 0.1 μA @ VR = 21.6 V - ensures minimal leakage below regulation threshold |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode indicated by a single color 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 | Non-banded end | Connected to lower-potential node; reverse-biased during regulation |
| Cathode | Banded end | Connected to higher-potential node; defines regulated output reference point |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered DO-35 construction | Ensures mechanical and electrical interchangeability across qualified suppliers |
| ±10% voltage tolerance (A suffix) | Provides cost-optimized accuracy for non-critical regulation without tight-bin sorting |
| 250 °C/W junction-to-lead thermal resistance | Enables predictable thermal management using standard lead-length mounting practices |
| Radiation-hardened per MicroNote 050 | Supports deployment in space-grade and nuclear instrumentation applications |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for handling precautions during manual assembly or rework |
Applications
| Voltage Reference for Op-Amp Circuits | Overvoltage Clamp in Sensor Interfaces |
|---|---|
Use Scenario: Provides stable 27 V reference to bias instrumentation amplifiers in industrial process transmitters. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise common-mode level for differential signal conditioning. Use Value: Maintains reference accuracy within ±10% over –40°C to +85°C, reducing calibration drift in 4–20 mA loop-powered systems. | Use Scenario: Protects ADC input pins from transient overvoltage events in automotive cabin sensors. IC Role / Device Role / Timing Role: Passive clamping element diverting excess energy to ground when input exceeds 27 V. Use Value: Limits peak voltage to ≤27.3 V (27 V × 1.01) with <0.1 μA leakage below clamp threshold, preserving signal integrity. |
| Feedback Regulation in DC-DC Converters | ESD Protection in Legacy RS-232 Lines |
Use Scenario: Sets output voltage in isolated flyback converters via optocoupler feedback network. IC Role / Device Role / Timing Role: Zener-based voltage divider supplying error amplifier reference in secondary-side regulation. Use Value: Delivers stable 27 V reference at 4.6 mA with 600 Ω dynamic impedance, ensuring tight output regulation under load transients. | Use Scenario: Shields line drivers/receivers against ±15 kV contact ESD per IEC 61000-4-2 in legacy serial communication ports. IC Role / Device Role / Timing Role: Low-capacitance shunt protector absorbing ESD energy before IC damage occurs. Use Value: Exhibits minimal capacitance (typ. <2 pF) and withstands repeated ESD strikes without parameter shift due to inherent ESD immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5254B | ±5% tolerance (vs. ±10% for 1N5254A); otherwise identical electrical and mechanical specs | Used where tighter voltage accuracy is required without changing layout or thermal design | Select 1N5254B when system tolerance budget demands <±0.5 V deviation at 27 V |
| MMBZ5254B | SOT-23 surface-mount package; same 27 V, ±5%; 225 mW rating (vs. 500 mW) | Preferred for space-constrained PCBs where thermal mass and power handling are less critical | Choose MMBZ5254B only if board area savings outweigh 55% power reduction and reflow-compatible assembly is available |
Compared with 1N5254B and MMBZ5254B, the 1N5254A offers the lowest-cost path to 27 V regulation with proven axial-leaded reliability, while trading tolerance for cost and maintaining full 500 mW capability-making it optimal for cost-sensitive, through-hole industrial controls.
Availability
1N5254A is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and DC-DC feedback applications requiring stable component supply, long-term obsolescence resilience, and MIL-qualified screening options.
Supply support for 1N5254A 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 aerospace-grade components.
The 1N52xxA/B series was designed for general-purpose and high-stability Zener regulation in military, industrial, and space applications where DO-35 form factor, wide temperature operation, and JEDEC standardization are essential.
FAQ
What is the nominal Zener voltage and tolerance of the 1N5254A?
The 1N5254A has a nominal Zener voltage of 27 V with a tolerance of ±10%, as designated by the "A" suffix per Microsemi's documentation. This tolerance is guaranteed across the full operating temperature range and defines the allowable deviation in regulation voltage under specified test conditions (IZT = 4.6 mA).
What package type and mounting configuration does the 1N5254A use?
The 1N5254A uses the DO-35 (DO-204AH) hermetically sealed glass axial-leaded package. It is mounted through-hole with the cathode identified by a single band; the banded end must be held positive relative to the anode for proper Zener regulation. Lead finish is tin-lead or RoHS-compliant matte tin.
What is the maximum power dissipation and thermal derating behavior of the 1N5254A?
The 1N5254A is rated for 500 mW power dissipation at 25°C ambient, with linear derating above that temperature. Its thermal resistance is 250 °C/W junction-to-lead at 3/8″ (10 mm) lead length from the body, meaning power must be reduced by 2 mW per °C rise above 25°C when lead-mounted per specification.
How does the temperature coefficient of the 1N5254A affect its regulation stability?
The 1N5254A has a temperature coefficient of +0.090 %/°C, measured from 25°C to 125°C at rated IZT. This means its Zener voltage increases by approximately 24.3 mV per °C rise (27 V × 0.0009), which must be accounted for in precision reference designs operating across wide temperature ranges.
Is the 1N5254A suitable for high-reliability or radiation-exposed environments?
Yes-the 1N5254A is inherently radiation-hardened per MicroNote 050 and qualified to MIL-PRF-19500 screening levels (e.g., JAN, JANTX) when ordered with appropriate prefixes and the "-1" suffix. Its glass DO-35 construction and ESD immunity (MIL-STD-750 Method 1020) further support deployment in aerospace and nuclear instrumentation.
1N5254A 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):
- 27 V
- Tolerance:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 41 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 21 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)
1N5254A FAQ
1.How can I place an order for 1N5254A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5254A 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 1N5254A reliable?
The price and inventory of 1N5254A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5254A is usually 5 days.
3.What payment methods are accepted for 1N5254A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5254A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5254A?
1N5254A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5254A 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 1N5254A?
For technical support, including 1N5254A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5254A requirements.
6.How does Aetrix verify that 1N5254A is sourced from the original manufacturer or authorized distributors?
All 1N5254A 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 1N5254A meets industry standards.
7.What is the process for return or replacement of 1N5254A?
All 1N5254A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5254A, 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 1N5254A part is unused and in its original packaging.
Return procedure for 1N5254A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5254A Tags
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BZT52C5V6T-7
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BZX84C3V3LT1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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SMAJ4744A-TP
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SMAZ12-13-F
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