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

onsemi 1N5245B_S00Z

Name: 1N5245B_S00Z
Brand: onsemi
SKU: 1N5245B_S00Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5245B_S00Z

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: 1N5245B_S00Z.pdf

Description:: DIODE ZENER 15V 500MW DO35

Quantity:: RFQ Add To RFQ list

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Inventory:5,003

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Product details

Overview

1N5245B_S00Z from ON Semiconductor is a 15 V ±5% tolerance silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 25°C, with 16 Ω dynamic impedance at 20 mA test current and 0.1 μA reverse leakage at 11.4 V, used for precision voltage regulation in low-power analog reference and bias circuits.

For engineers reviewing the 1N5245B_S00Z datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, cathode identification, and direct alternatives for stable voltage reference design in industrial sensors and power supply feedback networks.

Technical Context

This device operates as a two-terminal voltage reference where reverse-biased junction breakdown provides stable DC output under controlled current. It exhibits a positive temperature coefficient of +0.082 %/°C and requires minimum 0.25 mA Zener test current to maintain regulation.

Designed for operation within -65°C to +200°C junction temperature range, it features hermetically sealed DO-35 glass construction with cathode band marking, and must be derated linearly above 50°C at 4.0 mW/°C to maintain reliability.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	15 V nominal, min 14.25 V / max 15.75 V at I_Z = 20 mA - defines regulated output voltage window under standard test conditions
Power Dissipation (P_D)	500 mW at T_A = 25°C - maximum continuous power before thermal shutdown or degradation
Dynamic Impedance (Z_Z)	16 Ω at I_Z = 20 mA - quantifies voltage stability against load current variation
Reverse Leakage (I_R)	0.1 μA at V_R = 11.4 V - ensures minimal quiescent current in standby regulation
Temperature Coefficient	+0.082 %/°C - indicates voltage drift magnitude per degree Celsius change in junction temperature
Forward Voltage (V_F)	≤1.2 V at I_F = 200 mA - specifies conduction threshold when used in forward-biased protection roles

Pinout & Package

DO-35 glass axial-leaded package with cathode identified by color band; leads are tinned copper-clad steel, 0.533 mm diameter, 3.05 mm body length, 1.91 mm max diameter, and 25.4 mm minimum lead spacing (T50).

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connects to lower potential node in reverse-bias regulation; enables forward protection clamping below 1.2 V
Cathode	Zener breakdown terminal	Marked with color band; connects to higher potential node to enable controlled reverse breakdown at 15 V

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Ensures predictable regulation across production lots without post-assembly trimming
Hermetic DO-35 glass seal	Provides long-term stability and moisture resistance in harsh ambient environments
Low 0.1 μA leakage at 76% V_Z	Minimizes standby power loss in battery-powered voltage reference applications
Linear thermal derating	Enables safe operation up to +200°C junction temperature with defined power reduction above 50°C

Applications

Industrial Sensor Reference	Low-Power Supply Feedback
Use Scenario: Providing stable 15 V reference for 4–20 mA transmitter signal conditioning circuitry exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to generate fixed reference voltage for op-amp biasing and ADC reference scaling. Use Value: Maintains <±1% output accuracy over -40°C to +85°C ambient due to known +0.082 %/°C TC and low leakage.	Use Scenario: Regulating feedback node in isolated flyback converter auxiliary winding circuit powering PWM controller bias rail. IC Role / Device Role / Timing Role: Two-terminal shunt regulator establishing precise 15 V bias point for TL431 or optocoupler input stage. Use Value: Delivers stable regulation with 16 Ω Z_Z to suppress ripple-induced error in feedback loop without external compensation.
Microcontroller Reset Circuit	ESD-Protected Analog Input
Use Scenario: Generating clean 15 V reset threshold for microcontroller brown-out detection in automotive body control modules. IC Role / Device Role / Timing Role: Voltage reference element in RC-based reset timing network with hysteresis via comparator input. Use Value: Ensures monotonic reset assertion across voltage ramp-up/down cycles due to tight 5% tolerance and low tempco.	Use Scenario: Clamping high-impedance analog sensor inputs (e.g., thermistor bridge) against ESD transients while preserving DC accuracy. IC Role / Device Role / Timing Role: Bidirectional protection device-forward-conducting below 1.2 V, reverse-regulating at 15 V during overvoltage events. Use Value: Limits transient voltage to ≤15 V without loading sensor output, enabled by 0.1 μA leakage at 11.4 V.

Industrial Sensor Reference

Low-Power Supply Feedback

Use Scenario: Providing stable 15 V reference for 4–20 mA transmitter signal conditioning circuitry exposed to wide ambient temperature swings.

IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to generate fixed reference voltage for op-amp biasing and ADC reference scaling.

Use Value: Maintains <±1% output accuracy over -40°C to +85°C ambient due to known +0.082 %/°C TC and low leakage.

Use Scenario: Regulating feedback node in isolated flyback converter auxiliary winding circuit powering PWM controller bias rail.

IC Role / Device Role / Timing Role: Two-terminal shunt regulator establishing precise 15 V bias point for TL431 or optocoupler input stage.

Use Value: Delivers stable regulation with 16 Ω Z_Z to suppress ripple-induced error in feedback loop without external compensation.

Microcontroller Reset Circuit

ESD-Protected Analog Input

Use Scenario: Generating clean 15 V reset threshold for microcontroller brown-out detection in automotive body control modules.

IC Role / Device Role / Timing Role: Voltage reference element in RC-based reset timing network with hysteresis via comparator input.

Use Value: Ensures monotonic reset assertion across voltage ramp-up/down cycles due to tight 5% tolerance and low tempco.

Use Scenario: Clamping high-impedance analog sensor inputs (e.g., thermistor bridge) against ESD transients while preserving DC accuracy.

IC Role / Device Role / Timing Role: Bidirectional protection device-forward-conducting below 1.2 V, reverse-regulating at 15 V during overvoltage events.

Use Value: Limits transient voltage to ≤15 V without loading sensor output, enabled by 0.1 μA leakage at 11.4 V.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5245BRLG	Same electrical specs; tape-and-reel packaging (3,000 pcs), no underscore in part number	No functional difference; optimized for automated SMT placement rather than manual prototyping	Select 1N5245BRLG for volume production; 1N5245B_S00Z remains valid for legacy BOMs and Digi-Key/Mouser catalog lookups
BZX55-C15	15 V ±5%, 500 mW, but 20 Ω Z_Z at 5 mA (vs. 16 Ω at 20 mA); different thermal derating slope	Slightly higher impedance reduces regulation precision under varying load; requires recalculation of series resistor for target I_Z	Use BZX55-C15 only if existing layout uses TO-92 footprint; not drop-in due to package and test-current mismatch

Compared with 1N5245B_S00Z, 1N5245BRLG offers identical performance in tape-and-reel form for manufacturing, while BZX55-C15 requires redesign of bias network and thermal margin analysis due to differing Z_Z test condition and package thermal resistance.

Availability

1N5245B_S00Z is available at Aetrix Electronics and suitable for industrial sensor reference, low-power supply feedback, and microcontroller reset circuits requiring stable component supply with guaranteed long-term continuity.

Supply support for 1N5245B_S00Z 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

ON Semiconductor (Semiconductor Components Industries, LLC) is a global supplier of energy-efficient semiconductor components for automotive, industrial, cloud computing, and IoT applications.

The 1N52xxB series belongs to ON Semiconductor's legacy discrete Zener diode product line, designed specifically for cost-sensitive, high-reliability voltage reference and regulation in analog and power management circuits.

FAQ

What is the Zener voltage tolerance for 1N5245B_S00Z?

The 1N5245B_S00Z has a Zener voltage tolerance of ±5%, meaning its rated 15 V breakdown occurs between 14.25 V and 15.75 V when tested at 20 mA. This tolerance is guaranteed across production lots and is specified in the ON Semiconductor 1N5221B–1N5263B datasheet Rev. 3, December 2018. The 1N5245B_S00Z maintains this specification under standard thermal conditions (T_A = 25°C).

Does 1N5245B_S00Z have a cathode marking, and how is it identified?

Yes, the 1N5245B_S00Z features a visible cathode band on the DO-35 glass body, located near one end of the cylindrical package. This band denotes the cathode terminal, which must be connected to the higher-potential node in reverse-bias regulation applications. The marking complies with JEDEC DO-204AH standards and is confirmed in the mechanical drawing DO35AREV03 referenced in the official ON Semiconductor datasheet.

What is the maximum operating junction temperature for 1N5245B_S00Z?

The 1N5245B_S00Z supports an operating junction temperature range of -65°C to +200°C, as stated in the Absolute Maximum Ratings table of the ON Semiconductor datasheet. This wide range enables use in under-hood automotive, downhole, and industrial environments where ambient temperatures exceed 125°C, provided power dissipation is derated at 4.0 mW/°C above 50°C ambient.

Can 1N5245B_S00Z be used in forward-bias mode?

Yes, the 1N5245B_S00Z can conduct in forward bias with a maximum forward voltage of 1.2 V at 200 mA, as specified in the Electrical Characteristics table. This capability allows dual-use in bidirectional protection circuits-clamping positive transients below 1.2 V and regulating negative overvoltages at 15 V-without requiring additional diodes in the 1N5245B_S00Z design.

How does the temperature coefficient affect 1N5245B_S00Z performance?

The 1N5245B_S00Z has a temperature coefficient of +0.082 %/°C, meaning its Zener voltage increases by approximately 12.3 mV per °C rise in junction temperature. This positive drift must be accounted for in precision reference designs operating across wide temperature ranges; for example, a 50°C rise adds ~0.615 V to the nominal 15 V output, directly impacting system-level accuracy unless compensated.

1N5245B_S00Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Bulk

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 15 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 16 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 11 V

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

Operating Temperature:: -65°C ~ 200°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-35

1N5245B_S00Z FAQ

1.How can I place an order for 1N5245B_S00Z through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5245B_S00Z 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 1N5245B_S00Z reliable?

The price and inventory of 1N5245B_S00Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5245B_S00Z is usually 5 days.

3.What payment methods are accepted for 1N5245B_S00Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5245B_S00Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5245B_S00Z?

1N5245B_S00Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5245B_S00Z 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 1N5245B_S00Z?

For technical support, including 1N5245B_S00Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5245B_S00Z requirements.

6.How does Aetrix verify that 1N5245B_S00Z is sourced from the original manufacturer or authorized distributors?

All 1N5245B_S00Z 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 1N5245B_S00Z meets industry standards.

7.What is the process for return or replacement of 1N5245B_S00Z?

All 1N5245B_S00Z units undergo pre-shipment inspection (PSI). If there is an issue with 1N5245B_S00Z, 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 1N5245B_S00Z part is unused and in its original packaging.

Return procedure for 1N5245B_S00Z:

1.Submit a request within 90 days.

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

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