J112RLRAG N-Channel JFET Equivalent & Substitute Parts

Part Overview

The J112RLRAG is an N-Channel JFET transistor manufactured by onsemi, rated for 35 V breakdown voltage with 350 mW power dissipation in a TO-92 through-hole package. This part is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from the active product line are necessary for new designs and ongoing production requirements. Substitute parts maintain electrical compatibility while offering improved availability and compliance certifications.

Key Parameters

Parameter	Value	Unit
FET Type	N-Channel	—
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	-65 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-226-3, TO-92-3 Long Body (Formed Leads)	—

Substitute Part Grouping Explanation

Substitution for the J112RLRAG is determined by the following critical parameters:

FET Type: N-Channel (required match)
Voltage - Breakdown (V(BR)GSS): 35 V (required match)
Current - Drain (Idss) @ Vds (Vgs=0): 5 mA @ 15 V (required match)
Voltage - Cutoff (VGS off) @ Id: 1 V @ 1 µA (required match)
Resistance - RDS(On): 50 Ohms (required match)
Package / Case: TO-92-3 (required match)
Mounting Type: Through Hole (required match)

Substitute parts are grouped into two categories:

Direct Substitutes (Identical Electrical Parameters): Parts that maintain all electrical specifications of the J112RLRAG while offering higher power ratings and active product status.

Similar Substitutes (Different Base Product Number): Parts with different electrical parameters (higher Idss and lower RDS(On)) that share the same voltage rating and package but operate under different bias conditions.

Parameter Comparison

Parameter	J112RLRAG	J112-D26Z	J112-D27Z	J112-D74Z	J111-D26Z	J111-D74Z
Product Status	Obsolete	Active	Active	Active	Active	Active
FET Type	N-Channel	N-Channel	N-Channel	N-Channel	N-Channel	N-Channel
Voltage - Breakdown (V(BR)GSS)	35 V	35 V	35 V	35 V	35 V	35 V
Current - Drain (Idss) @ Vds (Vgs=0)	5 mA @ 15 V	5 mA @ 15 V	5 mA @ 15 V	5 mA @ 15 V	20 mA @ 15 V	20 mA @ 15 V
Voltage - Cutoff (VGS off) @ Id	1 V @ 1 µA	1 V @ 1 µA	1 V @ 1 µA	1 V @ 1 µA	3 V @ 1 µA	3 V @ 1 µA
Resistance - RDS(On)	50 Ohms	50 Ohms	50 Ohms	50 Ohms	30 Ohms	30 Ohms
Power - Max	350 mW	625 mW	625 mW	625 mW	625 mW	625 mW
Operating Temperature	-65 to 150 °C	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C
Package / Case	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3	TO-226-3, TO-92-3
RoHS Status	Not Specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Inventory Status	1003 Pcs	2100 Pcs	2791 Pcs	65368 Pcs	43529 Pcs	59715 Pcs

Engineering Selection Recommendations

Direct Substitutes (Recommended for Pin-Compatible Replacement)

J112-D26Z, J112-D27Z, and J112-D74Z are direct electrical equivalents to the J112RLRAG. These parts maintain identical Idss, VGS(off), and RDS(On) specifications while offering 625 mW power rating versus the original 350 mW. All three are active products with ROHS3 compliance certification. J112-D74Z offers the highest inventory availability at 65,368 pieces.

Similar Substitutes (Alternative for Different Operating Conditions)

J111-D26Z and J111-D74Z are active products with identical voltage ratings and package configuration but differ in drain current and on-resistance characteristics. These parts feature 20 mA Idss and 30 Ohms RDS(On) compared to the J112 series specifications of 5 mA and 50 Ohms. These substitutes are suitable only when circuit design accommodates higher drain current and lower on-resistance operation. Both J111 variants are ROHS3 compliant with substantial inventory availability.

Compliance and Availability Considerations

All substitute parts carry ROHS3 compliance and REACH Unaffected status. The J112-D74Z variant provides the optimal combination of direct electrical equivalence, active product status, and maximum inventory availability for immediate procurement.

Frequently Asked Questions (FAQ)

Q: Can J112-D74Z directly replace J112RLRAG in existing designs?

A: Yes. J112-D74Z maintains identical electrical parameters (Idss, VGS(off), RDS(On), and voltage rating) and uses the same TO-92-3 package. The higher power rating (625 mW versus 350 mW) provides additional thermal margin without affecting circuit operation.

Q: What is the difference between J112 and J111 series substitutes?

A: The J111 series (J111-D26Z, J111-D74Z) operates at higher drain current (20 mA versus 5 mA) and lower on-resistance (30 Ohms versus 50 Ohms). These are not direct replacements and require circuit verification to confirm compatibility with the intended application.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts listed (J112-D26Z, J112-D27Z, J112-D74Z, J111-D26Z, J111-D74Z) are ROHS3 compliant. The original J112RLRAG does not specify RoHS status due to its obsolete classification.

Q: What is the minimum operating temperature difference between the original and substitutes?

A: The J112RLRAG operates from -65°C to 150°C, while all substitute parts operate from -55°C to 150°C. The minimum temperature specification differs by 10°C. Applications requiring operation below -55°C must use the original part or verify circuit functionality at the lower temperature limit.

Q: Which substitute part offers the best availability?

A: J112-D74Z provides the highest inventory with 65,368 pieces in stock, followed by J111-D74Z with 59,715 pieces. Both are direct or functionally equivalent options with active product status.

Q: Are the packaging specifications identical across all parts?

A: Yes. All parts use TO-226-3 or TO-92-3 through-hole packages with formed leads. Physical dimensions and pin configurations are identical, enabling direct PCB compatibility.

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