1N4115-TP Equivalent & Substitute Parts

Part Overview

The 1N4115-TP is a Zener diode rated at 22 V, 500 mW in a DO-35 through-hole package, manufactured by Micro Commercial Co. This part is classified as obsolete, indicating that direct procurement from the original manufacturer is no longer available. Equivalent and substitute parts from active manufacturers must be identified to maintain circuit functionality and ensure continued supply chain availability for applications requiring 22 V Zener regulation.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	22	V
Power - Maximum	500	mW
Tolerance	±5%	-
Package / Case	DO-204AH, DO-35, Axial	-
Mounting Type	Through Hole	-
Operating Temperature	175	°C (TJ)
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the 1N4115-TP is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nominal): 22 V
Power - Maximum: 500 mW
Package / Case: DO-204AH (DO-35), Axial
Mounting Type: Through Hole
RoHS Status: ROHS3 Compliant

Secondary Compatibility Factors:

Tolerance: ±5% or tighter (±2%)
Operating Temperature: 175°C maximum junction temperature
Impedance (Zzt): Varies by series; lower impedance provides better regulation
Current - Reverse Leakage: Acceptable within application requirements
Voltage - Forward (Vf): 1.1 V to 1.5 V @ 200 mA

All substitute parts listed meet the primary matching criteria. Differences in impedance, reverse leakage current, and forward voltage reflect design variations across different manufacturer series (1N5251, BZX55, TZX) and do not prevent functional substitution when electrical specifications remain within acceptable operating ranges.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Power (mW)	Tolerance	Zzt (Ohms)	Vf @ 200mA (V)	Product Status	Packaging
1N4115-TP	Micro Commercial Co	22	500	±5%	150	1.1	Obsolete	-
1N5251B-TR	Vishay General Semiconductor	22	500	±5%	29	1.1	Active	Tape & Reel
1N5251C-TAP	Vishay General Semiconductor	22	500	±5%	29	1.1	Active	Tape & Box
1N5251C-TR	Vishay General Semiconductor	22	500	±2%	29	1.1	Active	Tape & Reel
BZX55C22-TAP	Vishay General Semiconductor	22	500	±5%	55	1.5	Active	Cut Tape
BZX55C22-TR	Vishay General Semiconductor	22	500	±5%	55	1.5	Active	Tape & Reel
TZX22A-TAP	Vishay General Semiconductor	22	500	-	65	1.5	Active	Tape & Box
TZX22A-TR	Vishay General Semiconductor	22	500	-	65	1.5	Active	Cut Tape
TZX22B-TAP	Vishay General Semiconductor	22	500	-	65	1.5	Active	Tape & Box
TZX22B-TR	Vishay General Semiconductor	22	500	-	65	1.5	Active	Tape & Reel
TZX22C-TAP	Vishay General Semiconductor	22	500	-	65	1.5	Active	Tape & Box

Engineering Selection Recommendations

Primary Substitutes (Direct Functional Equivalents):

The 1N5251B-TR, 1N5251C-TAP, and 1N5251C-TR from Vishay General Semiconductor are the most direct substitutes. These parts maintain identical nominal voltage (22 V) and power rating (500 mW) with superior impedance characteristics (29 Ohms versus 150 Ohms). All three are AEC-Q101 qualified automotive-grade components with active product status, ensuring long-term availability. The 1N5251C-TR offers tighter tolerance (±2%) compared to the original ±5% specification.

Secondary Substitutes (Functional Equivalents with Design Variations):

The BZX55C22-TAP and BZX55C22-TR series provide functional substitution with moderate impedance (55 Ohms) and extended operating temperature range (-65°C to 175°C). The TZX22A-TAP, TZX22A-TR, TZX22B-TAP, TZX22B-TR, and TZX22C-TAP series offer the widest temperature range and are suitable for applications requiring enhanced thermal performance. These parts feature higher impedance (65 Ohms) and forward voltage (1.5 V @ 200 mA) compared to the 1N5251 series.

Compliance and Certification:

All substitute parts are ROHS3 compliant and carry AEC-Q101 automotive qualification. Selection between substitute options depends on packaging requirements (Cut Tape, Tape & Box, or Tape & Reel) and circuit-specific impedance and temperature requirements.

Frequently Asked Questions (FAQ)

Q: Can the 1N5251B-TR directly replace the 1N4115-TP without circuit modification?

A: Yes. Both parts share identical nominal voltage (22 V), power rating (500 mW), and package type (DO-35). The 1N5251B-TR features lower impedance (29 Ohms versus 150 Ohms), which improves voltage regulation stability. No circuit modification is required.

Q: What is the difference between the 1N5251 and BZX55 series substitutes?

A: The 1N5251 series (29 Ohms impedance) provides superior regulation performance with lower impedance. The BZX55 series (55 Ohms impedance) offers a wider operating temperature range (-65°C to 175°C) and is suitable for applications requiring extended thermal performance. Both series meet the 22 V, 500 mW specification.

Q: Why do the TZX22 series parts show no tolerance specification?

A: The TZX22 series tolerance is not provided in the available technical data. These parts are functionally equivalent at 22 V, 500 mW but feature higher impedance (65 Ohms) and forward voltage (1.5 V @ 200 mA). Tolerance information should be obtained from the manufacturer datasheet for applications requiring specific voltage accuracy.

Q: Does packaging type (Cut Tape, Tape & Box, Tape & Reel) affect electrical performance?

A: No. Packaging type affects only handling, storage, and assembly processes. Electrical performance is identical across all packaging variants of the same base part number. Selection should be based on manufacturing assembly requirements and inventory management practices.

Q: Are all substitute parts automotive-qualified?

A: Yes. All Vishay substitute parts listed carry AEC-Q101 automotive qualification and are suitable for automotive and industrial applications requiring qualified components.

Q: What is the significance of the ±2% tolerance on the 1N5251C-TR?

A: The ±2% tolerance on the 1N5251C-TR provides tighter voltage accuracy compared to the original 1N4115-TP (±5%). This tighter tolerance is beneficial for applications requiring precise voltage regulation but is not required for direct substitution.

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