J112RL1 JFET N-Channel Transistor: Equivalent & Substitute Parts

Part Overview

The J112RL1 is an N-Channel JFET transistor manufactured by onsemi, rated for 35 V breakdown voltage with 350 mW maximum power dissipation in a TO-92 through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. Substitute parts maintain electrical compatibility within defined parameter ranges while offering improved availability and modern compliance certifications.

Key Parameters

Parameter	Value	Unit
Voltage - Breakdown (V(BR)GSS)	35	V
Current - Drain (Idss) @ Vds (Vgs=0)	5	mA @ 15 V
Voltage - Cutoff (VGS off) @ Id	1	V @ 1 µA
Resistance - RDS(On)	50	Ohms
Power - Max	350	mW
Operating Temperature Range	-65 to 150	°C (TJ)
Mounting Type	Through Hole	-
Package / Case	TO-226-3, TO-92-3 Long Body	-
FET Type	N-Channel	-

Substitute Part Grouping Explanation

Substitute parts for the J112RL1 are grouped based on electrical parameter compatibility and package equivalence. The primary substitution criteria are:

Electrical Compatibility Parameters:

Voltage - Breakdown (V(BR)GSS): Must equal 35 V
FET Type: Must be N-Channel
Current - Drain (Idss) @ Vds (Vgs=0): Acceptable range 2–20 mA @ 15 V
Voltage - Cutoff (VGS off) @ Id: Acceptable range 500 mV–3 V @ 1 µA
Resistance - RDS(On): Acceptable range 30–100 Ohms
Power - Max: Must be ≥350 mW

Package Compatibility:

Mounting Type: Through Hole
Package / Case: TO-226-3 or TO-92-3 variants

Substitute parts are divided into two categories:

Category A - Direct Electrical Match (J112 Base Series): J112-D26Z, J112-D27Z, J112-D74Z maintain identical Idss (5 mA), VGS off (1 V), and RDS(On) (50 Ohms) specifications as the J112RL1, with increased power rating (625 mW) and improved temperature range (-55 to 150°C). These parts are functionally equivalent with enhanced thermal performance.

Category B - Related Electrical Match (J111 and J113 Base Series): J111-D26Z and J111-D74Z feature higher Idss (20 mA) and lower RDS(On) (30 Ohms), suitable for applications requiring lower on-resistance. J113-D74Z features lower Idss (2 mA) and higher RDS(On) (100 Ohms), suitable for applications requiring higher impedance characteristics. All maintain 35 V breakdown voltage and TO-92-3 package compatibility.

Parameter Comparison

Part Number	Manufacturer	Product Status	Idss @ 15V (mA)	VGS off @ 1µA (V)	RDS(On) (Ohms)	Power Max (mW)	Temp Range (°C)	Package	RoHS Status
J112RL1	onsemi	Obsolete	5	1	50	350	-65 to 150	TO-92-3	Non-compliant
J112-D26Z	onsemi	Active	5	1	50	625	-55 to 150	TO-92-3	ROHS3 Compliant
J112-D27Z	onsemi	Active	5	1	50	625	-55 to 150	TO-92-3	ROHS3 Compliant
J112-D74Z	onsemi	Active	5	1	50	625	-55 to 150	TO-92-3	ROHS3 Compliant
J111-D26Z	onsemi	Active	20	3	30	625	-55 to 150	TO-92-3	ROHS3 Compliant
J111-D74Z	onsemi	Active	20	3	30	625	-55 to 150	TO-92-3	ROHS3 Compliant
J113-D74Z	onsemi	Active	2	0.5	100	625	-55 to 150	TO-92-3	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - J112 Series (J112-D26Z, J112-D27Z, J112-D74Z): These parts provide direct electrical equivalence to the J112RL1 with identical Idss, VGS off, and RDS(On) specifications. All are active products with ROHS3 compliance and improved power rating (625 mW vs. 350 mW). Selection among these three variants depends on packaging format availability (Cut Tape) and supplier inventory levels. These are the preferred substitutes for direct replacement in existing designs.

Secondary Recommendation - J111 Series (J111-D26Z, J111-D74Z): These parts are suitable for applications where lower on-resistance (30 Ohms vs. 50 Ohms) and higher drain current (20 mA vs. 5 mA) are acceptable or beneficial. Circuit redesign may be required to accommodate the different electrical characteristics. Both variants are active products with ROHS3 compliance.

Tertiary Recommendation - J113-D74Z: This part is suitable for applications requiring higher impedance characteristics (100 Ohms RDS(On), 2 mA Idss). Circuit redesign is required. This part is an active product with ROHS3 compliance.

Compliance Consideration: All substitute parts are ROHS3 compliant, addressing the non-compliance status of the obsolete J112RL1. For new designs or redesigns, ROHS3-compliant substitutes are required.

Frequently Asked Questions (FAQ)

Q: Can J112-D26Z, J112-D27Z, and J112-D74Z be used interchangeably with J112RL1? A: Yes. These three parts have identical electrical specifications (Idss, VGS off, RDS(On)) and package type (TO-92-3). The differences are in packaging format (Cut Tape vs. bulk) and supplier inventory. They are direct functional equivalents with improved power rating and compliance certifications.

Q: What is the difference between J112-D26Z and J112-D74Z? A: Both parts have identical electrical specifications and package type. The difference is in the packaging format designation (D26Z vs. D74Z), which relates to supplier tape and reel configurations. Electrical performance is identical.

Q: Can J111-D26Z replace J112RL1 in all applications? A: J111-D26Z has different electrical characteristics: higher Idss (20 mA vs. 5 mA), higher VGS off (3 V vs. 1 V), and lower RDS(On) (30 Ohms vs. 50 Ohms). It is electrically compatible within the 35 V breakdown voltage class but may require circuit analysis to confirm suitability for specific applications. Circuit redesign may be necessary.

Q: Can J113-D74Z replace J112RL1? A: J113-D74Z has different electrical characteristics: lower Idss (2 mA vs. 5 mA), lower VGS off (500 mV vs. 1 V), and higher RDS(On) (100 Ohms vs. 50 Ohms). It is electrically compatible within the 35 V breakdown voltage class but requires circuit analysis and potential redesign for specific applications.

Q: What is the temperature operating range difference? A: J112RL1 operates from -65°C to 150°C. All substitute parts operate from -55°C to 150°C. For applications requiring operation below -55°C, J112RL1 specifications must be maintained or alternative parts evaluated.

Q: Are all substitute parts RoHS compliant? A: Yes. All substitute parts listed are ROHS3 compliant. The original J112RL1 is RoHS non-compliant. For new designs or procurement requiring RoHS compliance, substitute parts are mandatory.

Q: What is the package compatibility? A: All parts use TO-92-3 (TO-226-3) through-hole packages with formed leads. Physical pin configuration and PCB footprint are identical. Direct board-level substitution is possible without layout modification.

Q: Why is J112RL1 listed as obsolete? A: Obsolete status indicates the part is no longer manufactured or supported by onsemi. Active substitute parts from the J111, J112, and J113 series provide continued design support and procurement availability.

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