BF245A,112 Equivalent & Substitute Parts

Part Overview

The BF245A,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 15V and maximum current rating of 6.5mA. 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 and substitute parts necessary for ongoing design support and procurement. Substitute parts must maintain compatibility with the TO-92-3 package, N-Channel JFET configuration, and similar electrical operating parameters to ensure functional equivalence in RF circuit applications.

Substiute Parts

BF245A,112

NXP USA Inc.In Stock: 1200BF245A,112 Datasheet

Current PartRFQ

BF256B

onsemiIn Stock: 39931BF256B Datasheet

MFR RecommendedRFQ

J109-D26Z

onsemiIn Stock: 40106J109-D26Z Datasheet

MFR RecommendedRFQ

J211-D74Z

onsemiIn Stock: 4793J211-D74Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BF245A,112 are selected based on the following critical parameters that determine functional equivalence:

Primary Compatibility Criteria:

• Technology: N-Channel JFET
• Package: TO-92-3 (TO-226AA) through-hole configuration
• Mounting Type: Through Hole
• Voltage Rating: Equal to or greater than 15V test voltage
• Current Capability: Equal to or greater than 6.5mA
• RoHS Compliance: ROHS3 Compliant

Substitute Parts Identified:

1. BF256B (onsemi) - Rated voltage 30V, current rating 13mA, active product status
2. J211-D74Z (onsemi) - Rated voltage 25V, current rating 20mA, active product status
3. J109-D26Z (onsemi) - Breakdown voltage 25V, drain current 40mA @ 15V, active product status

All substitute parts maintain N-Channel JFET technology, TO-92-3 package configuration, and through-hole mounting compatibility with the original BF245A,112.

Parameter Comparison

Engineering Selection Recommendations

BF256B (onsemi) - Recommended as primary substitute. Maintains identical rated voltage (30V) and TO-92-3 package configuration. Current rating of 13mA exceeds the original 6.5mA requirement. Active product status ensures long-term availability and supply chain continuity. ROHS3 compliance and MSL rating 1 match original specifications.

J211-D74Z (onsemi) - Suitable substitute with rated voltage of 25V and current rating of 20mA, both exceeding original specifications. Active product status provides supply reliability. ROHS3 compliant. MSL rating not applicable does not impact through-hole component handling.

J109-D26Z (onsemi) - Acceptable substitute with breakdown voltage of 25V and drain current of 40mA @ 15V, providing significant margin above original operating parameters. Active product status ensures availability. ROHS3 compliant. Resistance specification of 12 Ohms provides additional design parameter reference.

All three substitute parts are active products from onsemi, providing superior long-term availability compared to the obsolete BF245A,112. Selection among substitutes should be based on specific circuit requirements for voltage headroom, current capacity, and noise performance characteristics not fully specified in available datasheets.

Frequently Asked Questions (FAQ)

Q: Why is the BF245A,112 being discontinued? A: The BF245A,112 is classified as obsolete by the manufacturer. Substitute parts must be identified to maintain design continuity and ensure component availability for production and repair applications.

Q: Can BF256B directly replace BF245A,112 in existing designs? A: BF256B is compatible based on package configuration (TO-92-3), technology (N-Channel JFET), and electrical parameters. The rated voltage (30V) and current rating (13mA) both meet or exceed original specifications. Pin configuration compatibility should be verified against specific circuit schematics.

Q: What is the difference between J211-D74Z and J109-D26Z? A: Both are N-Channel JFET devices in TO-92-3 packages. J211-D74Z has a rated voltage of 25V and current rating of 20mA. J109-D26Z has a breakdown voltage of 25V with drain current of 40mA @ 15V and includes resistance specification of 12 Ohms. Selection depends on specific circuit current and voltage requirements.

Q: Are all substitute parts RoHS compliant? A: Yes. BF245A,112, BF256B, J211-D74Z, and J109-D26Z are all ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing and use.

Q: Does package compatibility guarantee functional equivalence? A: Package compatibility (TO-92-3) and technology compatibility (N-Channel JFET) are necessary but not sufficient conditions. Electrical parameters including voltage rating, current capacity, and noise characteristics must also be evaluated against circuit design requirements.

Q: What is the MSL rating and why does it matter? A: MSL (Moisture Sensitivity Level) rating indicates component sensitivity to moisture during storage and handling. BF245A,112 and BF256B have MSL rating 1 (Unlimited), indicating no moisture sensitivity restrictions. J211-D74Z and J109-D26Z have MSL rating Not Applicable, typical for through-hole components with minimal moisture absorption risk.

Q: Can I use these substitutes interchangeably in production? A: All substitute parts maintain TO-92-3 package configuration and N-Channel JFET technology. However, circuit-specific requirements for voltage headroom, current capacity, and noise performance should be evaluated. Pin configuration must be verified to ensure correct device orientation and connection.