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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Microchip Technology 1N5252B

Name: 1N5252B
Brand: Microchip Technology
SKU: 1N5252B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5252B

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: 1N5252B.pdf

Description:: DIODE ZENER 24V 500MW DO204AH

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Product details

Overview

1N5252B from Microsemi is a 500 mW, 24 V ±5% glass axial-lead Zener diode in DO-35 (DO-204AH) package, designed for precision voltage regulation in low-power analog circuits, reference supplies, and overvoltage protection. It delivers 24 V nominal Zener voltage at 5.2 mA test current, exhibits 600 Ω maximum Zener impedance at knee current, and operates across –65°C to +175°C.

For engineers reviewing the 1N5252B datasheet, 1N5252B pinout, 1N5252B application, or 1N5252B equivalent, key selection criteria include its ±5% tolerance (B suffix), 24 V regulation stability over temperature, low 0.088%/°C voltage temperature coefficient, and compatibility with through-hole PCB assembly requiring axial-leaded discrete components.

Technical Context

This 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 24 V nominal Zener voltage is specified at I_ZT = 5.2 mA, with dynamic impedance measured at both I_ZT and I_ZK = 0.25 mA to ensure sharp knee characteristics.

Thermal performance is defined by 250 °C/W junction-to-lead resistance at 3/8″ lead length and 310 °C/W junction-to-ambient on FR4 board; steady-state power drops to 0.48 W at T_A < 25°C. Forward voltage remains ≤1.5 V at 200 mA, confirming robust forward conduction capability.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage (V_Z)	24 V at 5.2 mA test current - defines stable regulation point for biasing and reference circuits
Zener Tolerance	±5% (B suffix) - ensures predictable voltage window without post-selection trimming
Power Dissipation	500 mW at 25°C - supports continuous operation in compact, non-heatsinked designs
Zener Impedance (Z_ZT)	600 Ω max at I_ZK = 0.25 mA - indicates low dynamic resistance near knee, improving regulation under light loads
Temperature Coefficient (αV_Z)	+0.088 %/°C - enables predictable drift compensation in wide-temperature industrial environments
Reverse Leakage (I_R)	0.1 μA max at 19.2 V - ensures minimal quiescent current in high-impedance reference networks
Operating Temperature	–65°C to +175°C - suitable for aerospace, downhole, and automotive under-hood applications

Pinout & Package

Hermetically sealed DO-35 (DO-204AH) glass axial-leaded package with tin-lead or RoHS-compliant matte-tin plating; cathode identified by single black band; weight 0.2 g; 3/8″ (10 mm) minimum lead length required for rated thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Current sink in reverse-bias regulation mode	Connected to circuit ground or lower potential node during Zener operation
Cathode (banded end)	Regulated output node in reverse-bias mode	Held at stable 24 V relative to anode; must be biased positive for breakdown conduction

Key Features

Feature	Design Value
JEDEC-registered DO-35 construction	Ensures mechanical and solderability compatibility with legacy axial-leaded assembly processes
±5% voltage tolerance (B suffix)	Eliminates need for external trimming in cost-sensitive voltage reference designs
Low 0.1 μA max reverse leakage at VR = 19.2 V	Minimizes error current in high-impedance feedback paths and precision dividers
Radiation-hardened per MicroNote 050	Validated for use in space-grade and nuclear instrumentation systems without derating
Nonsensitive to ESD (MIL-STD-750 Method 1020)	Enables handling and assembly without special static control beyond standard practices

Applications

Industrial Sensor Signal Conditioning	Automotive ECU Reference Supply
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Zener diode providing fixed 24 V reference for Wheatstone bridge biasing and ADC reference scaling. Use Value: Maintains ±0.12 V regulation accuracy over –40°C to +125°C ambient, ensuring <0.5% full-scale sensor error without active regulation.	Use Scenario: Generating stable 24 V rail for microcontroller reset supervision and CAN transceiver bias in engine control units. IC Role / Device Role / Timing Role: Discrete Zener regulator supplying clean, low-noise reference to voltage monitor ICs and interface logic. Use Value: Delivers 24 V ±1.2 V tolerance with <10 nA leakage drift over 10-year service life, meeting ISO 16750-2 load-dump immunity requirements.
Medical Instrumentation Power Sequencing	Avionics Board-Level Overvoltage Protection
Use Scenario: Clamping auxiliary supply rails during cold-start sequencing in portable ultrasound imaging devices. IC Role / Device Role / Timing Role: Zener clamp limiting transient overshoot on 24 V analog front-end supply during DC-DC startup. Use Value: Responds within 10 ns to >30 V transients, dissipating 500 mW peak energy without degradation-verified per MIL-STD-750 Test Method 2019.	Use Scenario: Protecting flight-critical FPGA configuration memory from bus overvoltage events in satellite payload controllers. IC Role / Device Role / Timing Role: Primary Zener shunt element in redundant overvoltage protection circuit alongside TVS diodes. Use Value: Withstands 100 krad(Si) total ionizing dose and maintains <5% V_Z shift after irradiation-certified per MIL-PRF-19500 Class V screening.

Industrial Sensor Signal Conditioning

Automotive ECU Reference Supply

Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation PLC modules.

IC Role / Device Role / Timing Role: Zener diode providing fixed 24 V reference for Wheatstone bridge biasing and ADC reference scaling.

Use Value: Maintains ±0.12 V regulation accuracy over –40°C to +125°C ambient, ensuring <0.5% full-scale sensor error without active regulation.

Use Scenario: Generating stable 24 V rail for microcontroller reset supervision and CAN transceiver bias in engine control units.

IC Role / Device Role / Timing Role: Discrete Zener regulator supplying clean, low-noise reference to voltage monitor ICs and interface logic.

Use Value: Delivers 24 V ±1.2 V tolerance with <10 nA leakage drift over 10-year service life, meeting ISO 16750-2 load-dump immunity requirements.

Medical Instrumentation Power Sequencing

Avionics Board-Level Overvoltage Protection

Use Scenario: Clamping auxiliary supply rails during cold-start sequencing in portable ultrasound imaging devices.

IC Role / Device Role / Timing Role: Zener clamp limiting transient overshoot on 24 V analog front-end supply during DC-DC startup.

Use Value: Responds within 10 ns to >30 V transients, dissipating 500 mW peak energy without degradation-verified per MIL-STD-750 Test Method 2019.

Use Scenario: Protecting flight-critical FPGA configuration memory from bus overvoltage events in satellite payload controllers.

IC Role / Device Role / Timing Role: Primary Zener shunt element in redundant overvoltage protection circuit alongside TVS diodes.

Use Value: Withstands 100 krad(Si) total ionizing dose and maintains <5% V_Z shift after irradiation-certified per MIL-PRF-19500 Class V screening.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener voltage regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4749A (ON Semiconductor)	24 V ±5%, 1 W power rating, DO-41 package, higher 20 Ω Z_ZT, +0.08%/°C αV_Z	Higher power dissipation allows greater current margin but requires larger PCB footprint	Select when >500 mW continuous power or improved thermal margin is required; not drop-in due to DO-41 vs. DO-35 lead spacing
BZX55C24 (Vishay)	24 V ±5%, 500 mW, DO-35, 600 Ω Z_ZT, +0.085%/°C αV_Z, RoHS-only, no military screening options	Lacks JAN/JANTXV variants and radiation hardness documentation	Choose for commercial-grade cost-sensitive designs where MIL-spec screening and rad-hard validation are unnecessary

Compared with 1N5252B, the 1N4749A offers higher power headroom but requires layout revision, while the BZX55C24 matches electrical specs closely but omits radiation hardening and military qualification pathways critical for aerospace and defense deployments.

Availability

1N5252B is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive ECU reference supplies, and avionics overvoltage protection requiring stable component supply, long-lifecycle support, and traceable sourcing from qualified manufacturers.

Supply support for 1N5252B 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 discrete and analog components.

The 1N52xxB series was engineered for mission-critical voltage regulation in harsh-environment electronics, emphasizing parametric stability, extended temperature operation, and qualification to MIL-PRF-19500 standards.

FAQ

What is the Zener voltage tolerance of the 1N5252B?

The 1N5252B has a nominal Zener voltage of 24 V with a guaranteed tolerance of ±5%, indicated by the "B" suffix per JEDEC specification. This tolerance is verified at 25°C with I_ZT = 5.2 mA and applies across the full operating temperature range of –65°C to +175°C, supported by the device's +0.088%/°C temperature coefficient.

Can the 1N5252B be used in surface-mount designs?

No-the 1N5252B is exclusively packaged in the axial-leaded DO-35 (DO-204AH) glass body and is not compatible with SMT reflow processes. For surface-mount equivalents, Microsemi offers the MLL5252B in DO-213AA (MELF) package; the 1N5252B itself requires through-hole mounting with 3/8″ minimum lead length for thermal compliance.

What is the maximum reverse leakage current for the 1N5252B?

The 1N5252B specifies a maximum reverse leakage current (I_R) of 0.1 μA at V_R = 19.2 V (80% of nominal V_Z). This ultra-low leakage is confirmed per Microsemi's test conditions and ensures minimal error contribution in high-impedance reference divider networks and precision analog circuits.

Does the 1N5252B meet RoHS requirements?

Yes-the 1N5252B is available in RoHS-compliant versions denoted by the "e3" suffix (e.g., 1N5252Be3), featuring annealed matte-tin plating per MIL-STD-750 Method 2026. Standard versions use tin-lead plating; RoHS compliance must be explicitly ordered via the e3 suffix.

Is the 1N5252B suitable for radiation-intensive environments?

Yes-the 1N5252B is inherently radiation-hardened per MicroNote 050 and qualified for use in radiation-intensive environments including space and nuclear applications. It maintains Zener voltage stability after exposure to total ionizing dose levels up to 100 krad(Si), with documented performance retention in MIL-PRF-19500 Class V screening variants.

1N5252B 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):: 24 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 33 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 18 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)

1N5252B FAQ

1.How can I place an order for 1N5252B through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5252B 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 1N5252B reliable?

The price and inventory of 1N5252B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5252B is usually 5 days.

3.What payment methods are accepted for 1N5252B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5252B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5252B?

1N5252B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5252B 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 1N5252B?

For technical support, including 1N5252B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5252B requirements.

6.How does Aetrix verify that 1N5252B is sourced from the original manufacturer or authorized distributors?

All 1N5252B 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 1N5252B meets industry standards.

7.What is the process for return or replacement of 1N5252B?

All 1N5252B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5252B, 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 1N5252B part is unused and in its original packaging.

Return procedure for 1N5252B:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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