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Microchip Technology 1N5250B
- Part No.:
- 1N5250B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5250B.pdf
- Description:
- DIODE ZENER 20V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:3,121
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Product details
Overview
1N5250B from Microsemi is a 20 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 6.2 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 1N5250B datasheet, 1N5250B pinout, 1N5250B application, or 1N5250B equivalent, key selection factors include its 20 V nominal Zener voltage with ±5% tolerance, 600 Ω Zener impedance at 0.25 mA, thermal resistance of 250 °C/W (junction-to-lead), and compatibility with manual or wave soldering at 260 °C for 10 s.
Technical Context
The 1N5250B operates as a reverse-biased silicon Zener diode with sharp breakdown knee, characterized by a temperature coefficient of +0.086 %/°C and minimal capacitance (typ. <2 pF at 0 V). Its regulation stability relies on controlled junction doping and hermetically sealed glass construction.
It delivers stable 20 V reference under DC test current of 6.2 mA, with maximum reverse leakage of 0.1 μA at 15.2 V and forward voltage ≤1.5 V at 200 mA. Thermal derating begins at 25 °C, maintaining 0.5 W dissipation only when lead temperature remains below 50 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 20 V ±5% - defines regulated output voltage in shunt configuration with 6.2 mA test current |
| Power Dissipation (PD) | 500 mW at 25 °C - sets maximum continuous power handling before thermal derating applies |
| Zener Impedance (ZZT) | 600 Ω at IZK = 0.25 mA - indicates voltage regulation stiffness under light-load conditions |
| Reverse Leakage (IR) | 0.1 μA max at 15.2 V - ensures minimal quiescent current in standby or high-impedance bias networks |
| Operating Temperature | –65 °C to +175 °C - supports deployment in automotive engine compartments and industrial control enclosures |
| Thermal Resistance | 250 °C/W (junction-to-lead) - determines allowable ambient rise for safe 500 mW operation with 3/8″ lead length |
| Forward Voltage | ≤1.5 V at 200 mA - enables use as a low-drop clamp or polarity protection diode in series configurations |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-leaded package with cathode indicated by 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 in Zener regulation; carries full load current during reverse conduction |
| Cathode | Banded end | Connected to higher-potential node; Zener breakdown occurs when cathode is ≥20 V above anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N52xxB series | Guarantees compliance with industry-standard electrical limits for VZ, IR, and VF, enabling cross-manufacturer design reuse |
| ±5% Zener voltage tolerance (B suffix) | Reduces binning requirements and simplifies BOM management versus looser-tolerance variants |
| Hermetic glass DO-35 package | Provides long-term reliability in humid or chemically aggressive environments without conformal coating |
| Radiation-hardened per MicroNote 050 | Supports operation in aerospace and defense systems where total ionizing dose (TID) exposure exceeds 100 krad(Si) |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for handling precautions or on-board ESD protection circuitry during assembly |
Applications
| Voltage Reference for Op-Amp Circuits | Overvoltage Clamp in Sensor Interfaces |
|---|---|
Use Scenario: Providing stable 20 V reference to instrumentation amplifier bias networks and ADC voltage references in data acquisition modules. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise DC offset and gain-setting points independent of supply rail variation. Use Value: Enables 12-bit measurement accuracy by limiting reference drift to <±10 mV over –40°C to +85°C ambient. | Use Scenario: Protecting 3.3 V or 5 V microcontroller GPIO pins from transient surges induced by inductive sensors or relay coils. IC Role / Device Role / Timing Role: Fast-acting shunt clamp diverting excess energy to ground before IC input structures exceed absolute maximum ratings. Use Value: Limits clamped voltage to ≤20.5 V (20 V + 5% tolerance), well below 24 V damage threshold of most mixed-signal SoCs. |
| Feedback Element in Linear Regulators | ESD-Safe Bias Network in RF Front Ends |
Use Scenario: Setting output voltage of discrete PNP-based linear regulators used in low-noise analog power supplies. IC Role / Device Role / Timing Role: Precision voltage divider element in feedback loop controlling base drive of pass transistor. Use Value: Maintains ±1.5% output regulation across 10:1 load current range due to low dynamic impedance and stable tempco. | Use Scenario: Establishing DC bias for GaAs FET amplifiers and PIN diode switches in cellular base station transceivers. IC Role / Device Role / Timing Role: High-impedance, ESD-immune bias source that avoids parasitic coupling into RF signal paths. Use Value: Delivers stable 20 V bias with <2 pF junction capacitance, preventing degradation of S21 and noise figure above 2 GHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A (ON Semiconductor) | 20 V ±5%, 1 W power rating, DO-41 package, 20 Ω ZZT at 19 mA | Higher power and lower impedance suit higher-current regulation; larger DO-41 footprint requires PCB redesign | Select when >500 mW dissipation or <50 Ω dynamic impedance is required; not drop-in due to package and thermal profile differences |
| BZX55-C20 (Vishay) | 20 V ±5%, 500 mW, DO-35 package, 50 Ω ZZT at 5 mA, –65°C to +175°C rating | Lower Zener impedance improves regulation under varying loads; identical DO-35 mechanical fit | Preferred for tighter regulation error budgets; verify compatibility with existing solder profiles due to differing plating specifications |
Compared with 1N5250B, the 1N4742A offers higher power and lower impedance but requires layout change, while the BZX55-C20 matches the DO-35 form factor and temperature range but delivers superior dynamic regulation performance at typical operating currents.
Availability
1N5250B is available at Aetrix Electronics and suitable for voltage reference design, overvoltage protection, and linear regulator feedback applications requiring stable component supply, long-lifecycle support, and traceable sourcing for industrial control, test equipment, and aerospace subsystems.
Supply support for 1N5250B 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 aerospace, defense, and industrial markets.
The 1N52xxB series was designed specifically for precision voltage regulation in harsh-environment applications where long-term stability, wide temperature operation, and ESD insensitivity are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N5250B?
The 1N5250B has a nominal Zener voltage of 20 V with a guaranteed tolerance of ±5%, as indicated by the "B" suffix per JEDEC standard. This tolerance applies under specified test conditions of 6.2 mA Zener test current at 25 °C and ensures predictable regulation across production lots without binning.
Can the 1N5250B be used in surface-mount designs?
No - the 1N5250B is packaged in the through-hole DO-35 (DO-204AH) glass axial-leaded format and is not a surface-mount device. For SMT equivalents, Microsemi offers the MLL5250B in DO-213AA (MELF) package; direct substitution requires board redesign and requalification.
What is the maximum reverse leakage current for the 1N5250B?
The 1N5250B specifies a maximum reverse leakage current (IR) of 0.1 μA at 15.2 V (76% of nominal VZ). This ultra-low leakage supports high-impedance bias networks and battery-powered applications where standby current must remain below 100 nA.
Is the 1N5250B suitable for automotive under-hood applications?
Yes - the 1N5250B is rated for operation from –65 °C to +175 °C and is radiation-hardened per MicroNote 050. Its hermetic glass package and ESD insensitivity (MIL-STD-750 Method 1020) make it suitable for engine control units, transmission controllers, and other under-hood modules meeting AEC-Q101 stress requirements.
How does the temperature coefficient affect regulation accuracy of the 1N5250B?
The 1N5250B has a positive temperature coefficient of +0.086 %/°C, meaning its Zener voltage increases by approximately 17.2 mV per 10 °C rise above 25 °C. Designers must account for this drift in precision references; for example, regulation shifts from 20.00 V at 25 °C to ~20.17 V at 45 °C.
1N5250B 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:
- 500 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 15 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)
1N5250B FAQ
1.How can I place an order for 1N5250B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5250B 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 1N5250B reliable?
The price and inventory of 1N5250B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5250B is usually 5 days.
3.What payment methods are accepted for 1N5250B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5250B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5250B?
1N5250B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5250B 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 1N5250B?
For technical support, including 1N5250B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5250B requirements.
6.How does Aetrix verify that 1N5250B is sourced from the original manufacturer or authorized distributors?
All 1N5250B 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 1N5250B meets industry standards.
7.What is the process for return or replacement of 1N5250B?
All 1N5250B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5250B, 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 1N5250B part is unused and in its original packaging.
Return procedure for 1N5250B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5250B Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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