1N5741C Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5741C is a 16 V, 500 mW Zener diode manufactured by Microchip Technology in a through-hole DO-35 package. This component is classified as Active and is used for voltage regulation and protection applications in electronic circuits. The 1N5741C features ±1% tolerance on the Zener voltage, providing precise voltage reference capabilities.

Substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required, or when different compliance certifications are needed for specific applications. The following equivalent parts maintain the core electrical specifications while offering variations in tolerance, power dissipation, impedance, and regulatory compliance.

Key Parameters

Parameter	1N5741C
Voltage - Zener (Nom)	16 V
Tolerance	±1%
Power - Max	500 mW
Impedance (Max)	40 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 11 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-65°C ~ 175°C
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the 1N5741C is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 16 V nominal
Mounting type: Through Hole
Package format: DO-35 (DO-204AH) or equivalent axial configuration

Secondary Compatibility Factors:

Power dissipation rating (500 mW or higher)
Operating temperature range (-65°C minimum to 175°C or higher)
Reverse leakage current specifications
Impedance characteristics

Tolerance Considerations: The 1N5741C specifies ±1% tolerance. Substitute parts with ±2% or ±5% tolerance represent relaxed specifications and are functionally compatible in applications where tighter voltage regulation is not critical. Parts with ±1% tolerance provide equivalent precision.

Compliance Variations: Substitute parts may differ in RoHS compliance status and REACH classification. These variations do not affect electrical functionality but are relevant for regulatory and procurement requirements.

Parameter Comparison

Parameter	1N5741C (Microchip)	1N5246B (Microchip)	1N5246B-T (Diodes Inc.)	1N5246BTR (Fairchild)	BZX79-B16,113 (NXP)	BZX79-B16,133 (Nexperia)
Voltage - Zener (Nom)	16 V	16 V	16 V	16 V	16 V	16 V
Tolerance	±1%	±5%	±5%	±5%	±2%	±2%
Power - Max	500 mW	500 mW	500 mW	500 mW	400 mW	400 mW
Impedance (Max)	40 Ohms	17 Ohms	17 Ohms	17 Ohms	40 Ohms	40 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 11 V	100 nA @ 12 V	100 nA @ 12 V	100 nA @ 12 V	50 nA @ 11.2 V	50 nA @ 11.2 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	1.5 V @ 200 mA	1.1 V @ 200 mA	1.2 V @ 200 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C	-65°C ~ 200°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-35	DO-35	DO-35	DO-35	ALF2	ALF2
Product Status	Active	Active	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant	Not specified	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

Direct Electrical Equivalents (16 V, 500 mW, Through Hole DO-35):

The 1N5246B (Microchip) and 1N5246BTR (Fairchild) are functionally equivalent to the 1N5741C with the following considerations:

Both maintain 16 V nominal Zener voltage and 500 mW power rating
Both are Active products with established supply chains
Tolerance is relaxed to ±5% compared to the 1N5741C's ±1%
Impedance is lower (17 Ohms vs. 40 Ohms), resulting in improved voltage regulation stability
Operating temperature extends to 200°C, providing broader thermal operating range

Improved Tolerance Alternative (16 V, 500 mW, Through Hole DO-35):

The BZX79-B16,113 and BZX79-B16,133 (NXP/Nexperia) offer ±2% tolerance, positioning them between the 1N5741C's ±1% precision and the 1N5246 series' ±5% tolerance:

Both maintain 16 V nominal Zener voltage
Power rating is 400 mW, which is lower than the 1N5741C's 500 mW
Impedance matches the 1N5741C at 40 Ohms
Reverse leakage current is lower (50 nA vs. 100 nA)
Operating temperature extends to 200°C
BZX79-B16,133 is ROHS3 Compliant, whereas the 1N5741C is RoHS non-compliant

Obsolete Status Consideration:

The 1N5246B-T (Diodes Incorporated) is marked as Obsolete and should not be selected for new designs or long-term supply requirements, despite its technical compatibility.

Compliance-Driven Selection:

For applications requiring RoHS3 compliance, the BZX79-B16,133 (Nexperia) is the recommended substitute, offering active product status and regulatory compliance while maintaining electrical compatibility within acceptable parameters.

Frequently Asked Questions (FAQ)

Q: Can the 1N5246B replace the 1N5741C in all applications?

A: The 1N5246B is electrically compatible for most applications. The primary difference is tolerance: 1N5246B has ±5% tolerance versus 1N5741C's ±1%. In applications requiring precise voltage regulation within ±1%, the 1N5246B may not meet specifications. The 1N5246B's lower impedance (17 Ohms vs. 40 Ohms) provides superior voltage regulation stability, which is advantageous in most circuits.

Q: What is the difference between the 1N5246B and 1N5246BTR?

A: Both parts are electrically identical 16 V, 500 mW Zener diodes with ±5% tolerance. The primary difference is manufacturer: 1N5246B is from Microchip Technology, while 1N5246BTR is from Fairchild Semiconductor. Both are Active products with equivalent performance characteristics.

Q: Why do the BZX79-B16 parts have lower power ratings (400 mW vs. 500 mW)?

A: The BZX79-B16,113 and BZX79-B16,133 are rated for 400 mW maximum power dissipation. In applications where the 1N5741C operates below 400 mW, these parts are fully compatible. For applications requiring the full 500 mW capability, the 1N5246 series is the appropriate substitute.

Q: Are the ALF2 and DO-35 packages interchangeable?

A: Both ALF2 and DO-35 are through-hole axial packages with identical lead spacing and mounting characteristics. They are mechanically and electrically interchangeable on standard PCBs. The ALF2 designation is used by NXP/Nexperia for their packaging standard, while DO-35 is the industry-standard designation used by other manufacturers.

Q: Should I use the BZX79-B16,133 for new designs requiring RoHS compliance?

A: Yes. The BZX79-B16,133 is ROHS3 Compliant and Active, making it suitable for new designs with regulatory compliance requirements. It maintains 16 V nominal voltage and 40 Ohms impedance matching the 1N5741C. The 400 mW power rating is the limiting factor; verify that your application does not exceed this specification.

Q: What is the impact of impedance differences between substitute parts?

A: Impedance affects voltage regulation quality. Lower impedance (17 Ohms in 1N5246 series) provides better voltage stability and faster response to load changes. Higher impedance (40 Ohms in 1N5741C and BZX79-B16 series) results in slightly higher output impedance but is acceptable for most standard voltage regulation applications. Selection depends on circuit requirements for transient response and regulation accuracy.

Q: Why is the 1N5246B-T listed as Obsolete?

A: The 1N5246B-T from Diodes Incorporated is marked as Obsolete, indicating it is no longer in active production. While inventory may be available from distributors, this part should not be selected for new designs or applications requiring long-term supply assurance. Active alternatives such as 1N5246B or 1N5246BTR are recommended.

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