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Microchip Technology 1N3525A-1
- Part No.:
- 1N3525A-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N3525A-1.pdf
- Description:
- DIODE ZENER 20V 400MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:5,288
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Product details
Overview
1N3525A-1 from Microsemi is a 400mW, 20.0V ±5% zener voltage regulator diode in a DO-35 hermetically sealed glass package, rated for 5.0mA test current and 20Ω maximum zener impedance at 25°C, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the 1N3525A-1 datasheet, 1N3525A-1 pinout, 1N3525A-1 application, or 1N3525A-1 equivalent, key selection criteria include zener voltage tolerance (±5%), thermal stability (–65°C to +175°C junction range), DC power dissipation (500mW @ TEC = +125°C), and DO-35 mechanical compatibility with legacy through-hole designs.
Technical Context
This discrete zener diode operates in reverse breakdown to maintain stable 20.0V regulation under controlled current conditions. Its 5.0mA zener test current and 20Ω dynamic impedance define its regulation accuracy and load transient response in feedback or reference paths.
The DO-35 glass package ensures hermetic sealing and long-term parameter stability, while the tin/lead lead finish supports reliable solder wetting. Junction temperature range (–65°C to +175°C) enables use in industrial and aerospace environments where thermal cycling is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.0 V ±5% @ IZT = 5.0 mA - defines nominal regulation point with tight tolerance for stable reference generation |
| Max Zener Impedance (ZZT) | 20 Ω @ IZT = 5.0 mA - indicates low dynamic resistance for minimal output voltage variation under load changes |
| Power Rating | 400 mW - sets maximum continuous dissipation limit at ambient temperature; derates to 500 mW at TEC = +125°C |
| Junction Temp Range | –65°C to +175°C - supports operation in extreme environmental conditions without parameter drift or failure |
| Forward Voltage | ≤1.1 V @ 200 mA - ensures predictable forward conduction behavior during fault or bidirectional clamp configurations |
| Package | DO-35 - standardized axial-lead glass package with cathode band marking, compatible with manual and wave-solder processes |
Pinout & Package
DO-35 hermetically sealed glass package with axial leads; cathode identified by a visible band on the glass body. No active pin numbering - anode and cathode are unidirectional terminals defined by polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-bias reference node | Connected to lower potential side in zener configuration; carries reverse leakage current below VZ |
| Cathode | Regulated output node | Marked with band; delivers stable 20.0V relative to anode when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic DO-35 packaging | Prevents moisture ingress and parameter shift over decades of operation in harsh environments |
| ±5% zener voltage tolerance | Enables direct use in precision reference circuits without external trimming or calibration |
| 5.0 mA zener test current | Optimized for low-current biasing in battery-powered or high-impedance feedback networks |
| 20 Ω max zener impedance | Minimizes output voltage deviation under varying load currents in voltage-clamp applications |
Applications
| Industrial Sensor Signal Conditioning | Legacy Power Supply Reference |
|---|---|
Use Scenario: Stabilizing excitation voltage for strain gauge bridges in factory-floor transmitters. IC Role / Device Role / Timing Role: Zener diode providing fixed 20.0V reference for op-amp biasing and ADC input scaling. Use Value: Tight ±5% tolerance and low 20Ω impedance ensure <±0.5% reference error across temperature and load variations. | Use Scenario: Regulating auxiliary rail in vintage linear power supplies for analog instrumentation. IC Role / Device Role / Timing Role: Discrete voltage clamp maintaining stable 20V output despite transformer ripple and load fluctuations. Use Value: DO-35 mechanical compatibility allows drop-in replacement in existing PCBs without layout modification. |
| Overvoltage Protection Circuit | Aerospace Avionics Bias Network |
Use Scenario: Clamping transient spikes on 18–22V logic supply lines in motor control modules. IC Role / Device Role / Timing Role: Shunt protector diverting excess energy to ground when voltage exceeds 20.0V threshold. Use Value: –65°C to +175°C junction rating ensures survivability during engine bay thermal excursions. | Use Scenario: Generating stable bias points for radiation-hardened amplifiers in satellite payload subsystems. IC Role / Device Role / Timing Role: Precision voltage reference element in multi-stage regulated power distribution network. Use Value: Hermetic DO-35 construction prevents parameter drift under vacuum and ionizing radiation exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | 20V ±5%, 1W rating, DO-41 package, 22Ω ZZT @ 5.0mA | Higher power handling but larger footprint; less suitable for space-constrained DO-35 layouts | Select when >400mW dissipation or improved thermal margin is required |
| BZX55C20 | 20V ±5%, 500mW rating, DO-35 package, 50Ω ZZT @ 5.0mA | Same package but higher impedance reduces regulation accuracy in precision references | Select when cost sensitivity outweighs need for low-impedance regulation |
Compared with 1N3525A-1, the 1N4744A offers greater power headroom but requires PCB redesign due to DO-41 size, while the BZX55C20 retains DO-35 compatibility but sacrifices regulation stability with 2.5× higher zener impedance.
Availability
1N3525A-1 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, legacy power supply reference, overvoltage protection circuit, and aerospace avionics bias network requiring stable component supply and long-term parametric consistency.
Supply support for 1N3525A-1 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, mixed-signal, and RF components for defense, aerospace, and industrial markets.
The 1N3525A-1 belongs to Microsemi's legacy DO-35 zener diode family, engineered for precision voltage regulation in mission-critical systems where long-term stability and hermetic reliability are mandatory.
FAQ
What is the zener voltage and tolerance of the 1N3525A-1?
The 1N3525A-1 has a nominal zener voltage of 20.0 V with a tolerance of ±5% at a test current of 5.0 mA. This specification is measured under thermal equilibrium at 25°C ±3°C and defines the device's regulation accuracy in stable reference applications. The 1N3525A-1 maintains this tolerance across its qualified operating temperature range.
What package type does the 1N3525A-1 use and how is polarity identified?
The 1N3525A-1 uses a DO-35 hermetically sealed glass package with axial leads. Polarity is marked by a visible cathode band on the glass body - the terminal adjacent to the band is the cathode, and the opposite lead is the anode. This marking aligns with industry-standard DO-35 conventions and ensures correct orientation during board assembly.
What is the maximum zener impedance of the 1N3525A-1 and why does it matter?
The 1N3525A-1 has a maximum zener impedance of 20 Ω at 5.0 mA test current. This low dynamic resistance minimizes output voltage variation under changing load conditions, making the 1N3525A-1 suitable for precision reference and low-noise clamp applications where regulation stability is critical.
Can the 1N3525A-1 be used in high-temperature environments?
Yes, the 1N3525A-1 is rated for junction and storage temperatures from –65°C to +175°C. Its hermetic DO-35 construction and silicon process enable reliable operation in extended thermal environments such as engine control units or downhole drilling electronics, where the 1N3525A-1 maintains specified electrical performance without degradation.
How does the 1N3525A-1 compare to modern surface-mount zener diodes?
The 1N3525A-1 is a through-hole DO-35 device optimized for legacy compatibility, hermetic reliability, and thermal robustness - unlike many SMT zeners that prioritize density over long-term stability. While newer SMT parts offer smaller footprints, the 1N3525A-1 remains preferred in aerospace and industrial repair where field-proven reliability and identical form-factor replacement are essential.
1N3525A-1 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):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N3525A-1 FAQ
1.How can I place an order for 1N3525A-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N3525A-1 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 1N3525A-1 reliable?
The price and inventory of 1N3525A-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N3525A-1 is usually 5 days.
3.What payment methods are accepted for 1N3525A-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N3525A-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N3525A-1?
1N3525A-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N3525A-1 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 1N3525A-1?
For technical support, including 1N3525A-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N3525A-1 requirements.
6.How does Aetrix verify that 1N3525A-1 is sourced from the original manufacturer or authorized distributors?
All 1N3525A-1 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 1N3525A-1 meets industry standards.
7.What is the process for return or replacement of 1N3525A-1?
All 1N3525A-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N3525A-1, 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 1N3525A-1 part is unused and in its original packaging.
Return procedure for 1N3525A-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N3525A-1 Tags
-
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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