BF245B,112 Equivalent & Substitute Parts Reference

Part Overview

The BF245B,112 is an N-Channel JFET RF transistor manufactured by NXP USA Inc., designed for RF applications operating at 100MHz with a rated voltage of 30V and current rating of 15mA. The device is packaged in TO-92-3 (TO-226AA) through-hole configuration with a noise figure of 1.5dB. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The BF245B,112 maintains ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substiute Parts

BF245B,112

NXP USA Inc.In Stock: 814BF245B,112 Datasheet

Current PartRFQ

BF256B

onsemiIn Stock: 39931BF256B Datasheet

MFR RecommendedRFQ

J109-D26Z

onsemiIn Stock: 40106J109-D26Z Datasheet

MFR RecommendedRFQ

J111

onsemiIn Stock: 95408J111 Datasheet

MFR RecommendedRFQ

J211-D74Z

onsemiIn Stock: 4793J211-D74Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BF245B,112 is determined by the following critical parameters: N-Channel JFET technology, TO-92-3 through-hole package configuration, rated voltage compatibility (minimum 30V), and current handling capability (minimum 15mA). All substitute parts listed maintain identical package geometry and mounting type, ensuring mechanical and electrical socket compatibility. Voltage ratings of substitute parts equal or exceed the original 30V specification. Current ratings and frequency characteristics are evaluated within the constraints of the provided data to ensure functional equivalence in RF applications.

The substitute parts are grouped by their active product status and availability, with preference given to parts maintaining the same RF JFET classification and noise performance characteristics where specified.

Parameter Comparison

Engineering Selection Recommendations

BF256B (onsemi): This part maintains identical rated voltage (30V) and package configuration (TO-92-3) as the original BF245B,112. Current rating of 13mA is within acceptable tolerance of the original 15mA specification. Product status is active with full ROHS3 compliance and unlimited MSL rating. This part is the primary equivalent for direct replacement in existing designs.

J109-D26Z (onsemi): Rated voltage of 25V is below the original 30V specification but remains within operational margins for many applications. Current rating of 40mA exceeds original requirements. Package and mounting type are identical. Product status is active with ROHS3 compliance. This part is suitable for applications where voltage headroom is not critical.

J111 (onsemi): Rated voltage of 35V exceeds the original 30V specification, providing additional voltage margin. Current rating of 20mA exceeds original 15mA requirement. Package and mounting type are identical. Product status is active with ROHS3 compliance. This part is suitable for applications requiring enhanced voltage tolerance.

J211-D74Z (onsemi): Rated voltage of 25V is below the original 30V specification. Current rating of 20mA exceeds original requirement. Package and mounting type are identical. Product status is active with ROHS3 compliance. This part is suitable for applications where voltage headroom is not critical.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original BF245B,112.

Frequently Asked Questions (FAQ)

Q: Can BF256B directly replace BF245B,112 in all applications?

A: BF256B maintains identical rated voltage (30V) and package configuration (TO-92-3). Current rating of 13mA is within tolerance of the original 15mA. Direct replacement is supported for applications where the 2mA current difference does not impact circuit performance.

Q: What is the voltage compatibility consideration for J109-D26Z and J211-D74Z?

A: Both J109-D26Z and J211-D74Z have rated voltages of 25V, which is 5V below the original BF245B,112 specification of 30V. These parts are suitable for applications where circuit operating voltage does not approach the 30V maximum rating. Circuit design review is required to confirm voltage margin adequacy.

Q: Why does J111 have a higher voltage rating than the original part?

A: J111 is rated at 35V, exceeding the original 30V specification. This higher rating provides additional voltage margin and does not prevent substitution. The part remains compatible with circuits designed for 30V operation.

Q: Are all substitute parts available in the same TO-92-3 package?

A: Yes. All substitute parts listed (BF256B, J109-D26Z, J111, J211-D74Z) are packaged in TO-92-3 (TO-226-3, TO-226AA) through-hole configuration, ensuring identical mechanical compatibility and PCB layout compatibility with the original BF245B,112.

Q: What is the product status significance for these substitutes?

A: All substitute parts maintain active product status with onsemi, ensuring ongoing availability and manufacturing support. The original BF245B,112 is classified as obsolete, making these active alternatives necessary for new procurement and long-term design support.

Q: Do all substitute parts meet the same compliance standards as BF245B,112?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory compliance profile of the original BF245B,112. Moisture sensitivity level (MSL 1) is maintained across all alternatives, indicating unlimited shelf life under standard storage conditions.