1N4109-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4109-TP is a 15 V, 500 mW Zener diode manufactured by Micro Commercial Co in a DO-35 through-hole package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design and procurement requirements. The 1N4109-TP maintains ROHS3 compliance and operates at a maximum junction temperature of 175°C. Substitute parts must maintain electrical equivalence across voltage regulation, power dissipation, and forward conduction characteristics while accommodating the through-hole axial package format.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	15	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	100	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 11.4 V	nA
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	V
Operating Temperature	175	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 1N4109-TP is determined by equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage: 15 V nominal
Power dissipation: 500 mW maximum
Package format: DO-35 through-hole axial configuration
RoHS3 compliance status

Acceptable Variation Ranges:

Zener voltage tolerance: ±5% or better
Forward voltage: 1.1 V or lower at 200 mA
Reverse leakage current: specifications provided by manufacturer
Impedance: maximum 100 Ohms or lower

All identified substitute parts maintain the 15 V zener voltage and 500 mW power rating in DO-35 through-hole packages. The substitute parts are classified as active products with current manufacturing status, ensuring long-term availability and supply chain continuity. Compliance certifications, including AEC-Q101 automotive qualification for applicable substitutes, are documented where provided.

Parameter Comparison

Parameter	1N4109-TP	1N5245B-TAP	1N5245B-TR	TZX15A-TAP	TZX15A-TR	TZX15B-TAP
Manufacturer	Micro Commercial Co	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor
Voltage - Zener (Nom)	15 V	15 V	15 V	15 V	15 V	15 V
Tolerance	±5%	±5%	±5%	—	—	—
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	100 Ohms	16 Ohms	16 Ohms	40 Ohms	40 Ohms	40 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 11.4 V	100 nA @ 11 V	100 nA @ 11 V	1 µA @ 11.5 V	1 µA @ 11.5 V	1 µA @ 11.5 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	175°C	175°C	—	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Grade	—	Automotive	—	Automotive	Automotive	Automotive
Qualification	—	AEC-Q101	—	AEC-Q101	AEC-Q101	AEC-Q101

Engineering Selection Recommendations

Primary Substitutes (Highest Electrical Compatibility):

The 1N5245B-TAP and 1N5245B-TR are direct electrical equivalents to the 1N4109-TP. Both parts maintain identical zener voltage (15 V), power rating (500 mW), and forward voltage characteristics (1.1 V @ 200 mA). The 1N5245B series exhibits lower impedance (16 Ohms versus 100 Ohms), which provides improved voltage regulation stability. Both parts are manufactured by Vishay General Semiconductor and carry AEC-Q101 automotive qualification. The 1N5245B-TAP is supplied in cut tape packaging, while the 1N5245B-TR is supplied in cut tape format. Both are active products with substantial inventory availability.

Secondary Substitutes (Acceptable with Design Consideration):

The TZX15A-TAP, TZX15A-TR, and TZX15B-TAP are active substitutes from the Vishay TZX series. These parts maintain the 15 V zener voltage and 500 mW power rating in identical DO-35 packages. The TZX series exhibits lower impedance (40 Ohms) and extended operating temperature range (-65°C to 175°C) compared to the 1N4109-TP. Forward voltage is specified at 1.5 V @ 200 mA, which is 0.4 V higher than the primary substitutes. All TZX variants carry AEC-Q101 automotive qualification. The TZX15A-TAP is supplied in tape and box packaging, while TZX15A-TR and TZX15B-TAP are supplied in cut tape format.

Compliance and Availability:

All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). The 1N5245B series and TZX series are active products with current manufacturing status, ensuring long-term supply chain continuity. Inventory levels for active substitutes range from 955 to 30,228 units, providing adequate procurement flexibility.

Frequently Asked Questions (FAQ)

Q: Can the 1N5245B-TAP directly replace the 1N4109-TP in existing designs?

A: Yes. The 1N5245B-TAP maintains identical zener voltage (15 V), power dissipation (500 mW), and forward voltage characteristics (1.1 V @ 200 mA). Both components use the DO-35 through-hole axial package. The lower impedance of the 1N5245B (16 Ohms versus 100 Ohms) provides improved voltage regulation performance without requiring circuit modification.

Q: What is the difference between 1N5245B-TAP and 1N5245B-TR?

A: Both parts are electrically identical 15 V, 500 mW zener diodes from Vishay. The primary difference is packaging format: 1N5245B-TAP is supplied in cut tape, while 1N5245B-TR is also supplied in cut tape. Both are suitable for through-hole assembly and carry AEC-Q101 automotive qualification.

Q: How do the TZX15 series parts differ from the 1N5245B series?

A: The TZX15 series (TZX15A-TAP, TZX15A-TR, TZX15B-TAP) maintains the same 15 V zener voltage and 500 mW power rating. Key differences include: impedance of 40 Ohms (lower than 1N4109-TP but higher than 1N5245B), forward voltage of 1.5 V @ 200 mA (0.4 V higher than 1N5245B), and extended operating temperature range of -65°C to 175°C. All TZX variants carry AEC-Q101 automotive qualification.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts (1N5245B-TAP, 1N5245B-TR, TZX15A-TAP, TZX15A-TR, TZX15B-TAP) are ROHS3 compliant and carry unlimited moisture sensitivity level (MSL 1).

Q: Which substitute part offers the best voltage regulation performance?

A: The 1N5245B series (1N5245B-TAP and 1N5245B-TR) offers the lowest impedance at 16 Ohms, providing superior voltage regulation stability compared to the original 1N4109-TP (100 Ohms impedance) and the TZX series (40 Ohms impedance).

Q: Can TZX15 parts be used in applications requiring the lowest forward voltage drop?

A: No. The TZX15 series specifies forward voltage at 1.5 V @ 200 mA, which is 0.4 V higher than both the 1N4109-TP and 1N5245B series at 1.1 V @ 200 mA. For applications sensitive to forward voltage drop, the 1N5245B series is the appropriate selection.

Q: What is the significance of AEC-Q101 qualification on substitute parts?

A: AEC-Q101 qualification indicates that the component meets automotive industry reliability and quality standards. The 1N5245B-TAP and all TZX series variants carry this qualification, confirming suitability for automotive and high-reliability applications.

Q: Are there inventory considerations when selecting between substitute parts?

A: Yes. Inventory levels vary: 1N5245B-TAP (20,200 units), 1N5245B-TR (16,218 units), TZX15A-TR (30,228 units), TZX15B-TAP (1,450 units), and TZX15A-TAP (955 units). For applications requiring immediate procurement, the TZX15A-TR and 1N5245B series offer the highest inventory availability.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message