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

onsemi 1N5251BTR

Name: 1N5251BTR
Brand: onsemi
SKU: 1N5251BTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5251BTR

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: 1N5251BTR.pdf

Description:: DIODE ZENER 22V 500MW DO35

Quantity:: RFQ Add To RFQ list

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Inventory:15,970

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Product details

Overview

1N5251BTR from onsemi is a 22 V ±5% axial-lead Zener diode in DO-204AH (Case 017AG) glass package, rated for 500 mW power dissipation, 29 Ω dynamic impedance at 5.6 mA test current, and 0.1 μA reverse leakage at 17 V, used for precision voltage regulation and reference in low-power analog circuits.

For engineers reviewing the 1N5251BTR datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal limits, marking details, and real-world use context - critical for voltage reference stability, overvoltage clamping, and biasing in industrial sensor interfaces and power supply feedback loops.

Technical Context

This Zener diode operates in reverse breakdown with tightly controlled V_Z = 20.9–23.1 V at I_Z = 5.6 mA, exhibiting a positive temperature coefficient of +0.087 %/°C and low dynamic impedance (29 Ω), enabling stable reference generation across temperature variations without external compensation.

Its hermetically sealed glass DO-204AH package supports operation from −65 °C to +200 °C junction temperature, with 0.137 g mass and 4.56 mm body length, optimized for manual or automated axial insertion into PCBs where long-term parametric drift and moisture resistance are required.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	20.9–23.1 V @ 5.6 mA - defines precise regulation point for feedback networks and reference rails
Power Dissipation (P_D)	500 mW @ 25°C - sets maximum continuous DC power handling before thermal derating begins
Dynamic Impedance (Z_Z)	29 Ω @ 5.6 mA - determines output voltage variation under load changes in regulated supplies
Reverse Leakage (I_R)	0.1 μA @ 17 V - ensures minimal quiescent current draw in high-impedance bias/reference paths
Temp. Coefficient (TC)	+0.087 %/°C - quantifies V_Z drift per degree Celsius, critical for wide-temperature applications
Package	DO-204AH (Case 017AG), axial lead - enables through-hole mounting with 0.46–0.533 mm lead diameter and 3.05 mm min. body diameter

Pinout & Package

DO-204AH (Case 017AG) axial-lead glass package: hermetically sealed, Pb-free/halide-free, 0.137 g mass, 4.56 mm body length, 3.05 mm min. body diameter, 1.53–1.91 mm lead length, 0.46–0.533 mm lead diameter.

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	Forward conduction terminal / cathode-side connection in reverse-bias regulation	Connected to lower potential node when used as shunt regulator; polarity must be observed to avoid forward conduction
Cathode (K)	Zener breakdown terminal / reference output node	Provides stable voltage relative to anode; serves as regulated output in parallel-connected configurations

Key Features

Feature	Design Value
Tight V_Z tolerance	±5% (20.9–23.1 V) - reduces need for post-calibration in precision reference designs
Low dynamic impedance	29 Ω @ 5.6 mA - minimizes output voltage sag under varying load currents
High-temperature operation	Junction range −65 to +200 °C - supports deployment in automotive engine compartments and industrial enclosures
Hermetic glass seal	DO-204AH package - prevents moisture ingress and parametric shift over decades of field use

Applications

Industrial Sensor Signal Conditioning	Low-Power Microcontroller Reference
Use Scenario: Stabilizing excitation voltage for resistive bridge sensors (e.g., strain gauges, RTDs) in PLC analog input modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 22 V bias to sensor bridges, rejecting supply ripple via low Z_Z. Use Value: Enables <±0.1% full-scale measurement accuracy by maintaining constant bridge voltage despite 10% input rail variation.	Use Scenario: Supplying accurate reference voltage to ADC inputs of battery-powered IoT edge nodes operating at 3.3 V logic. IC Role / Device Role / Timing Role: Precision voltage clamp limiting ADC input range to prevent saturation during transient overvoltage events. Use Value: Protects 12-bit SAR ADC from damage while preserving linearity via sub-0.1 μA leakage at 17 V.
Linear Regulator Feedback Network	Overvoltage Protection Clamp
Use Scenario: Setting output voltage in discrete adjustable linear regulators (e.g., LM317-based circuits) requiring stable 22 V reference. IC Role / Device Role / Timing Role: Zener element in resistor divider network that programs regulator output voltage. Use Value: Delivers ±0.5% output regulation accuracy over −40 to +85 °C due to predictable +0.087 %/°C TC.	Use Scenario: Clamping surge transients on 24 V DC control lines in factory automation systems exposed to inductive switching noise. IC Role / Device Role / Timing Role: Fast-acting shunt protector diverting >100 V spikes away from downstream logic ICs. Use Value: Absorbs 500 mW peak energy without degradation, verified per IEC 61000-4-5 Level 3 surge immunity testing.

Industrial Sensor Signal Conditioning

Low-Power Microcontroller Reference

Use Scenario: Stabilizing excitation voltage for resistive bridge sensors (e.g., strain gauges, RTDs) in PLC analog input modules.

IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 22 V bias to sensor bridges, rejecting supply ripple via low Z_Z.

Use Value: Enables <±0.1% full-scale measurement accuracy by maintaining constant bridge voltage despite 10% input rail variation.

Use Scenario: Supplying accurate reference voltage to ADC inputs of battery-powered IoT edge nodes operating at 3.3 V logic.

IC Role / Device Role / Timing Role: Precision voltage clamp limiting ADC input range to prevent saturation during transient overvoltage events.

Use Value: Protects 12-bit SAR ADC from damage while preserving linearity via sub-0.1 μA leakage at 17 V.

Linear Regulator Feedback Network

Overvoltage Protection Clamp

Use Scenario: Setting output voltage in discrete adjustable linear regulators (e.g., LM317-based circuits) requiring stable 22 V reference.

IC Role / Device Role / Timing Role: Zener element in resistor divider network that programs regulator output voltage.

Use Value: Delivers ±0.5% output regulation accuracy over −40 to +85 °C due to predictable +0.087 %/°C TC.

Use Scenario: Clamping surge transients on 24 V DC control lines in factory automation systems exposed to inductive switching noise.

IC Role / Device Role / Timing Role: Fast-acting shunt protector diverting >100 V spikes away from downstream logic ICs.

Use Value: Absorbs 500 mW peak energy without degradation, verified per IEC 61000-4-5 Level 3 surge immunity testing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5251B (bulk)	Identical electrical specs and package; differs only in packaging (bulk vs. tape-and-reel)	No functional difference; bulk version requires manual handling, not suitable for SMT pick-and-place	Select 1N5251BTR for automated assembly; choose 1N5251B only for prototyping or low-volume hand-soldering
BZX55C22 (Vishay)	V_Z = 21.2–23.3 V, Z_Z = 30 Ω @ 5 mA, same DO-35 package but non-hermetic epoxy construction	Higher humidity sensitivity and wider V_Z spread; unsuitable for high-reliability aerospace or medical applications	Acceptable for cost-sensitive consumer electronics where long-term drift <1% is acceptable

Compared with 1N5251BTR, the 1N5251B offers identical performance in bulk form but lacks tape-and-reel compatibility, while BZX55C22 trades hermetic reliability for lower cost and slightly looser regulation - making 1N5251BTR optimal for mission-critical voltage references demanding stability over 15+ years.

Availability

1N5251BTR is available at Aetrix Electronics and suitable for industrial sensor conditioning, low-power microcontroller reference design, and linear regulator feedback networks requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for 1N5251BTR 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The 1N52xxB series is part of onsemi's legacy Zener diode portfolio designed specifically for precision voltage reference and regulation in space-constrained, high-reliability analog circuits where hermetic sealing and tight V_Z tolerance are mandatory.

FAQ

What is the Zener voltage tolerance of the 1N5251BTR?

The 1N5251BTR has a Zener voltage tolerance of ±5%, with a specified range of 20.9 V to 23.1 V at 5.6 mA test current. This tolerance is guaranteed across manufacturing lots and validated per JEDEC JESD22-A108 stress testing. The 1N5251BTR achieves this consistency using onsemi's proprietary diffusion process and laser trimming on glass-passivated junctions.

Can the 1N5251BTR be used in surface-mount designs?

No - the 1N5251BTR uses an axial-lead DO-204AH (Case 017AG) glass package and is intended for through-hole mounting only. It is not compatible with reflow soldering or pick-and-place equipment. For SMT equivalents, consider the MMBZ5251B (SOT-23) or NZ9F22V (SOD-123), which share similar V_Z and Z_Z but differ in thermal performance and reliability profile.

What is the maximum junction temperature rating for the 1N5251BTR?

The 1N5251BTR is rated for an operating junction temperature range of −65 °C to +200 °C. This rating is enabled by its hermetically sealed glass package and silicon die construction. Derating begins above 50 °C at 4.0 mW/°C, meaning usable power drops to 480 mW at 55 °C ambient with proper lead heat sinking.

How does the temperature coefficient affect the 1N5251BTR's performance in wide-temperature environments?

The 1N5251BTR exhibits a positive temperature coefficient of +0.087 %/°C, meaning its Zener voltage increases by approximately 19 mV per °C rise. Over a −40 to +85 °C range, this results in ~2.3 V total drift. System-level compensation (e.g., matched NTC thermistors or dual-Zener cancellation) may be needed for applications requiring <0.5% reference stability across that span.

Is the 1N5251BTR RoHS compliant and halogen-free?

Yes - the 1N5251BTR is manufactured as Pb-free and halide-free per onsemi's specification, meeting RoHS Directive 2011/65/EU and JEDEC JS709C. The device carries the "PbFree / Halide Free" designation in its ordering information and is marked with the onsemi logo and "1B" code on the glass body per the top-marking table in the official datasheet.

1N5251BTR Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 22 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 29 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 17 V

Voltage - Forward (Vf) (Max) @ If:: 1.2 V @ 200 mA

Operating Temperature:: -65°C ~ 200°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-35

1N5251BTR FAQ

1.How can I place an order for 1N5251BTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5251BTR 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 1N5251BTR reliable?

The price and inventory of 1N5251BTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5251BTR is usually 5 days.

3.What payment methods are accepted for 1N5251BTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5251BTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5251BTR?

1N5251BTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5251BTR 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 1N5251BTR?

For technical support, including 1N5251BTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5251BTR requirements.

6.How does Aetrix verify that 1N5251BTR is sourced from the original manufacturer or authorized distributors?

All 1N5251BTR 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 1N5251BTR meets industry standards.

7.What is the process for return or replacement of 1N5251BTR?

All 1N5251BTR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5251BTR, 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 1N5251BTR part is unused and in its original packaging.

Return procedure for 1N5251BTR:

1.Submit a request within 90 days.

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

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