1N5259C-TAP Equivalent & Substitute Parts

Part Overview

The 1N5259C-TAP is a Zener diode rated at 39 V nominal voltage with 500 mW maximum power dissipation in a DO-35 through-hole package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as Active and carries AEC-Q101 automotive qualification. The device operates across a temperature range of -65°C to 175°C with ±2% voltage tolerance and is ROHS3 compliant.

Equivalent and substitute parts are identified when component availability changes, supply chain constraints occur, or design flexibility is required while maintaining functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	39	V
Power - Max	500	mW
Tolerance	±2%	-
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 30 V
Voltage - Forward (Max) @ If	1.1	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Through Hole	-
Package / Case	DO-204AH (DO-35)	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the 1N5259C-TAP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 39 V nominal
Mounting type: Through Hole
Package compatibility: DO-35 / DO-204AH axial configuration
RoHS3 compliance
Operating temperature range support

Secondary Compatibility Factors:

Power dissipation rating (500 mW or higher)
Voltage tolerance (±2% or ±5%)
Impedance characteristics
Reverse leakage current specifications
Forward voltage characteristics

Substitute parts are grouped based on whether they meet or exceed the primary matching criteria. Parts with lower power ratings (400 mW) are included as substitutes when all other electrical parameters align, as they represent functional alternatives in applications where the full 500 mW rating is not required.

Parameter Comparison

Parameter	1N5259C-TAP (Main)	1N5259B TR PBFREE	BZX79-B39,113	BZX79-B39,143	BZX79-C39,143
Manufacturer	Vishay General Semiconductor	Central Semiconductor Corp	Nexperia USA Inc.	Nexperia USA Inc.	NXP Semiconductors
Voltage - Zener (Nom)	39 V	39 V	39 V	39 V	39 V
Tolerance	±2%	±5%	±2%	±2%	±5%
Power - Max	500 mW	500 mW	400 mW	400 mW	400 mW
Impedance (Max)	80 Ohms	80 Ohms	130 Ohms	130 Ohms	130 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 30 V	100 nA @ 30 V	50 nA @ 27.3 V	50 nA @ 27.3 V	50 nA @ 27.3 V
Voltage - Forward (Max) @ If	1.1 V @ 200 mA	1.1 V @ 200 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature Range	-65 to 175°C	-65 to 200°C	-65 to 200°C	-65 to 200°C	-65 to 200°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH (DO-35)	DO-35	ALF2	ALF2	ALF2
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

1N5259B TR PBFREE (Central Semiconductor Corp)

This substitute provides the closest electrical match to the 1N5259C-TAP. Both devices share identical power ratings (500 mW), impedance (80 Ohms), and forward voltage characteristics (1.1 V @ 200 mA). The primary difference is voltage tolerance (±5% versus ±2%). The 1N5259B TR PBFREE extends the operating temperature range to 200°C and is ROHS3 compliant. This part is suitable for applications where the ±5% tolerance is acceptable and extended temperature operation is beneficial.

BZX79-B39,113 and BZX79-B39,143 (Nexperia USA Inc.)

These parts maintain the 39 V nominal voltage and ±2% tolerance of the main part. Both are rated at 400 mW maximum power, representing a 100 mW reduction from the 1N5259C-TAP. The impedance increases to 130 Ohms, and reverse leakage current decreases to 50 nA @ 27.3 V. Operating temperature extends to 200°C. These substitutes are applicable in designs where 400 mW power dissipation is sufficient. The BZX79-B39,143 is packaged in Tape & Box format, while the BZX79-B39,113 is supplied in Cut Tape.

BZX79-C39,143 (NXP Semiconductors)

This part matches the 39 V nominal voltage with ±5% tolerance. Power rating is 400 mW with 130 Ohms impedance. Reverse leakage is 50 nA @ 27.3 V. Operating temperature range extends to 200°C. This substitute is suitable for applications tolerating ±5% voltage tolerance and 400 mW power dissipation. The part is supplied in Bulk packaging.

All substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and through-hole mounting compatibility with the original 1N5259C-TAP.

Frequently Asked Questions (FAQ)

Q: Can the 1N5259B TR PBFREE replace the 1N5259C-TAP in all applications?

A: The 1N5259B TR PBFREE is electrically compatible for applications where ±5% voltage tolerance is acceptable. Both parts share identical power ratings (500 mW), impedance (80 Ohms), and forward voltage specifications. The extended operating temperature range (-65°C to 200°C) of the 1N5259B TR PBFREE provides additional capability beyond the original part's -65°C to 175°C range.

Q: What is the impact of using BZX79-B39 series parts with 400 mW rating instead of the 500 mW 1N5259C-TAP?

A: The BZX79-B39 series parts are suitable substitutes only in applications where the maximum power dissipation does not exceed 400 mW. If the circuit design requires the full 500 mW capability, these parts are not appropriate. The 1N5259B TR PBFREE maintains the 500 mW rating and is the preferred substitute when power dissipation is a critical parameter.

Q: Are the ALF2 package variants mechanically compatible with the DO-35 package?

A: Both ALF2 and DO-35 are axial through-hole packages. The BZX79-B39,113, BZX79-B39,143, and BZX79-C39,143 parts use the ALF2 supplier device package designation. Mechanical compatibility for PCB mounting depends on lead spacing and diameter specifications. Verification of physical dimensions is required before substitution in existing designs.

Q: What is the significance of the ±2% versus ±5% tolerance difference?

A: The 1N5259C-TAP and BZX79-B39 series maintain ±2% voltage tolerance, providing tighter voltage regulation. The 1N5259B TR PBFREE and BZX79-C39,143 operate at ±5% tolerance. Applications requiring precise voltage regulation benefit from the ±2% tolerance parts. Applications with broader tolerance requirements can utilize the ±5% tolerance alternatives.

Q: Do all substitute parts meet automotive qualification requirements?

A: The 1N5259C-TAP carries AEC-Q101 automotive qualification. The substitute parts listed are ROHS3 compliant and suitable for industrial and commercial applications. Automotive-specific qualification status for substitute parts should be verified against application requirements and supplier documentation.

Q: What packaging formats are available for these substitute parts?

A: The 1N5259C-TAP is supplied in Tape & Box (TB) format. The 1N5259B TR PBFREE is available in Cut Tape (CT). The BZX79-B39,113 is supplied in Cut Tape (CT), the BZX79-B39,143 in Tape & Box (TB), and the BZX79-C39,143 in Bulk format. Packaging selection depends on production volume and handling requirements.

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