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

Diodes Incorporated 1N5244B-T

Name: 1N5244B-T
Brand: Diodes Incorporated
SKU: 1N5244B-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5244B-T

Manufacturer:: Diodes Incorporated

Category:: Single Zener Diodes

Package:: -

Datasheet:: 1N5244B-T.pdf

Description:: DIODE ZENER 14V 500MW DO35

Quantity:: RFQ Add To RFQ list

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Inventory:16,266

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Product details

Overview

1N5244B-T from Diodes Incorporated is a 14 V, ±5% tolerance, 500 mW glass-encapsulated Zener diode in DO-35 package, designed for precision voltage regulation and reference applications in low-power analog circuits, power supply feedback loops, and overvoltage protection. It delivers 15 Ω dynamic impedance at 9.0 mA test current, 0.1 µA maximum reverse leakage at 10 V, and exhibits +0.082 %/°C temperature coefficient.

For engineers reviewing the 1N5244B-T datasheet, 1N5244B-T pinout, 1N5244B-T application, or 1N5244B-T equivalent, key selection considerations include its 14 V nominal Zener voltage with tight ±5% tolerance, low 15 Ω Zener impedance at I_ZT, hermetic glass DO-35 package, RoHS-compliant Sn96.5Ag3.5 terminations, and obsolescence status requiring migration planning.

Technical Context

This discrete Zener diode operates as a two-terminal voltage reference device, relying on controlled reverse breakdown of its epitaxial silicon junction to maintain stable output voltage under varying load and temperature conditions. Its design emphasizes thermal stability (±5% V_Z tolerance, +0.082 %/°C TC) and low dynamic impedance (15 Ω at 9.0 mA) for accurate regulation in low-current (<20 mA) biasing and clamping roles.

The DO-35 glass package provides hermetic sealing and mechanical robustness suitable for industrial environments, while its lead-free Sn96.5Ag3.5 finish complies with RoHS 2 and RoHS 3 directives. The cathode band polarity marking and 0.13 g mass reflect standardized surface-mount handling requirements despite through-hole mounting geometry.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	14.0 V nominal, 13.3–14.7 V range at 9.0 mA - defines precise regulation point for feedback or reference circuits
Power Dissipation (P_D)	500 mW - limits continuous operating current to ~35.7 mA at 14 V, constraining use to low-power stages
Zener Impedance (Z_ZT)	15 Ω at I_ZT = 9.0 mA - ensures minimal voltage deviation under small-signal load variations
Reverse Leakage (I_R)	0.1 µA max at V_R = 10 V - enables high-impedance bias networks without significant error current
Temperature Coefficient	+0.082 %/°C - quantifies V_Z drift magnitude per degree Celsius rise, critical for wide-temperature designs
Tolerance	±5% - guarantees production yield within 0.7 V window around 14 V, supporting predictable circuit margining
Package	DO-35 glass - hermetic, lead-free, J-STD-020 Level 1 moisture sensitivity, suitable for reflow and wave soldering

Pinout & Package

DO-35 glass axial package with cathode band marking; two terminals only - anode and cathode - no internal complexity or multi-pin configuration.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener reference ground node	Connected to circuit common or lower potential side; establishes reference polarity for reverse-biased operation
Cathode	Zener breakdown terminal / regulated output node	Marked with band; carries regulated voltage when reverse biased above V_Z; connects to feedback or clamp point

Key Features

Feature	Design Value
Hermetic Glass Encapsulation	Ensures long-term parameter stability and resistance to humidity-induced degradation in harsh environments
±5% Zener Voltage Tolerance	Reduces need for post-assembly trimming in cost-sensitive voltage reference applications
Lead-Free RoHS Compliance	Meets EU Directive 2011/65/EU and 2015/863/EU with Sn96.5Ag3.5 terminations, enabling global manufacturing
Low 15 Ω Dynamic Impedance	Minimizes output voltage variation under changing load currents, improving regulation accuracy in feedback paths
0.1 µA Max Reverse Leakage	Preserves high-impedance node integrity in precision biasing and sensor interface circuits

Applications

Power Supply Feedback Reference

Overvoltage Clamp Protection

Use Scenario: Used in the optocoupler feedback path of isolated DC-DC converters to regulate output voltage against line/load transients.

IC Role / Device Role / Timing Role: Zener reference element providing stable 14 V threshold to drive TL431 or optocoupler LED.

Use Value: Tight ±5% tolerance and low 15 Ω impedance ensure <±1% output regulation accuracy across temperature and aging.

Use Scenario: Placed across sensitive input rails (e.g., microcontroller I/O pins) to shunt transient surges exceeding 14 V.

IC Role / Device Role / Timing Role: Passive clamping device limiting peak voltage to protect downstream CMOS inputs.

Use Value: Fast response to overvoltage events and 0.1 µA leakage prevent false triggering or signal distortion during normal operation.

Low-Power Analog Biasing

Calibration Voltage Reference

Use Scenario: Generating stable 14 V bias for op-amp level-shifting stages in battery-powered instrumentation front-ends.

IC Role / Device Role / Timing Role: Precision DC reference source establishing fixed operating point for analog signal conditioning.

Use Value: +0.082 %/°C TC and hermetic DO-35 packaging enable <±20 mV drift over –40°C to +85°C ambient range.

Use Scenario: Embedded in factory calibration circuits of portable test equipment to set known voltage thresholds during self-test routines.

IC Role / Device Role / Timing Role: Traceable, stable voltage standard used during automated functional testing.

Use Value: ±5% initial tolerance and low long-term drift support pass/fail decisions within ±0.5% measurement uncertainty budgets.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMSZ5244B	SMD SOD-123 package, same 14 V ±5%, 500 mW rating, but 22 Ω Z_ZT at 5 mA	Surface-mount compatible; higher Z_ZT and lower test current reduce regulation precision in high-stability designs	Select for PCB space-constrained layouts where DO-35 axial leads are impractical
1N4742A	DO-41 package, 12 V nominal, 1 W rating, ±5% tolerance, 9 Ω Z_ZT at 21 mA	Higher power handling and lower impedance, but different voltage and larger package footprint	Choose when 12 V reference is acceptable and higher power dissipation capability is required

Compared with MMSZ5244B and 1N4742A, the 1N5244B-T offers tighter thermal stability in a legacy axial form factor, but requires migration planning due to obsolescence; MMSZ5244B supports modern SMT assembly, while 1N4742A trades voltage value for improved regulation at higher current.

Availability

1N5244B-T is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and low-power analog biasing applications requiring stable component supply and traceable sourcing for industrial control, test equipment, and legacy system maintenance.

Supply support for 1N5244B-T 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for industrial, computing, and consumer markets.

The 1N52xxB series belongs to Diodes' legacy Zener diode product line, engineered for precision voltage regulation in cost-sensitive, low-power analog systems where hermetic reliability and tight tolerance are essential.

FAQ

Is the 1N5244B-T still in active production?

No, the 1N5244B-T is officially obsolete and discontinued by Diodes Incorporated, as stated in DS18006 Rev. 19. It has been superseded by the MMSZ5244B SOD-123 surface-mount variant. Aetrix Electronics maintains limited legacy stock for repair and maintenance of existing designs but does not recommend new designs using this part.

What is the maximum reverse voltage before breakdown for the 1N5244B-T?

The 1N5244B-T exhibits a nominal Zener voltage of 14.0 V with a guaranteed range of 13.3 V to 14.7 V at 9.0 mA test current. Below this range, reverse leakage remains ≤0.1 µA at 10 V; sustained operation above 14.7 V risks thermal runaway unless power dissipation is strictly limited to ≤500 mW with proper heatsinking.

Can the 1N5244B-T be used in place of a 1N4742A?

No - the 1N5244B-T (14 V, 500 mW, DO-35) and 1N4742A (12 V, 1 W, DO-41) differ in voltage rating, power handling, package size, and Zener impedance. Substitution would require circuit redesign to accommodate the 2 V higher reference and reduced power margin, and mechanical adaptation for the smaller DO-35 body and shorter leads.

Does the 1N5244B-T meet automotive AEC-Q200 requirements?

No, the 1N5244B-T is not qualified to AEC-Q200. It is specified for industrial and commercial temperature ranges (–65°C to +175°C), but lacks the stress testing, failure analysis, and qualification documentation required for automotive-grade applications. For automotive use, consider Diodes' AEC-Q200-qualified Zener families such as the BZX84-Q series.

1N5244B-T Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: *

Package/Case:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

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

Tolerance:: -

Power - Max:: -

Impedance (Max) (Zzt):: -

Current - Reverse Leakage @ Vr:: -

Voltage - Forward (Vf) (Max) @ If:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

1N5244B-T FAQ

1.How can I place an order for 1N5244B-T through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5244B-T 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 1N5244B-T reliable?

The price and inventory of 1N5244B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5244B-T is usually 5 days.

3.What payment methods are accepted for 1N5244B-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5244B-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5244B-T?

1N5244B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5244B-T 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 1N5244B-T?

For technical support, including 1N5244B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5244B-T requirements.

6.How does Aetrix verify that 1N5244B-T is sourced from the original manufacturer or authorized distributors?

All 1N5244B-T 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 1N5244B-T meets industry standards.

7.What is the process for return or replacement of 1N5244B-T?

All 1N5244B-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N5244B-T, 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 1N5244B-T part is unused and in its original packaging.

Return procedure for 1N5244B-T:

1.Submit a request within 90 days.

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

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