BF240,112 Equivalent & Substitute Parts

Part Overview

The BF240,112 is an RF transistor NPN manufactured by NXP USA Inc., designed for RF applications requiring 40V collector-emitter breakdown voltage and 150MHz transition frequency. This through-hole TO-92-3 device delivers 300mW maximum power dissipation with a 25mA maximum collector current.

The BF240,112 is classified as obsolete. Locating equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or repair requirements for legacy systems utilizing this component.

Substiute Parts

BF240,112

NXP USA Inc.In Stock: 990BF240,112 Datasheet

Current PartRFQ

BF840,215

Nexperia USA Inc.In Stock: 10794BF840,215 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BF240,112 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Transistor Type: NPN (required match)
• Voltage - Collector Emitter Breakdown (Max): 40V (minimum requirement; higher values acceptable)
• Current - Collector (Ic) (Max): 25mA (minimum requirement; higher values acceptable)
• DC Current Gain (hFE) (Min) @ Ic, Vce: 67 @ 1mA, 10V (minimum requirement; higher values acceptable)
• Operating Temperature (TJ): 150°C (minimum requirement; higher values acceptable)

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole or Surface Mount (both acceptable for circuit redesign scenarios)
• Package / Case: TO-92-3 preferred for direct replacement; alternative packages acceptable with PCB layout modification

Regulatory Compliance:

• RoHS Status: ROHS3 Compliant (required match)

The BF840,215 satisfies all electrical compatibility criteria and regulatory requirements, with enhanced performance characteristics in frequency response and power dissipation.

Parameter Comparison

Engineering Selection Recommendations

BF840,215 as Primary Substitute:

The BF840,215 is the manufacturer-recommended substitute for the BF240,112. This substitution is supported by:

1. Electrical Equivalence: All critical electrical parameters match or exceed the BF240,112 specification. The 67 minimum DC current gain at 1mA, 10V is identical, ensuring circuit biasing compatibility.

2. Voltage and Current Ratings: Both devices share identical 40V collector-emitter breakdown voltage and 25mA maximum collector current ratings, confirming direct functional equivalence in voltage and current domains.

3. Regulatory Compliance: Both parts are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

4. Product Status: The BF840,215 is classified as Active with AEC-Q101 automotive qualification, ensuring ongoing availability and manufacturing support.

5. Performance Enhancement: The BF840,215 provides 380MHz transition frequency, exceeding the BF240,112's 150MHz specification. This enhanced frequency response supports higher-speed RF applications without circuit modification.

Implementation Considerations:

• Mounting Type Difference: The BF840,215 is a surface-mount device (TO-236AB/SOT-23-3) versus the through-hole TO-92-3 package of the BF240,112. PCB layout and assembly process modification is required.

• Power Dissipation: The BF840,215 maximum power rating is 250mW, compared to 300mW for the BF240,112. Verify that circuit power dissipation does not exceed 250mW under worst-case operating conditions.

• Inventory Status: The BF840,215 has 10,731 pieces in stock, providing reliable supply availability.

Frequently Asked Questions (FAQ)

Q: Can the BF840,215 directly replace the BF240,112 without PCB modification?

A: No. The BF840,215 uses a surface-mount TO-236AB (SOT-23-3) package, while the BF240,112 uses a through-hole TO-92-3 package. PCB layout redesign and assembly process changes are required. However, the electrical characteristics are fully compatible.

Q: Are the DC current gain specifications identical between these parts?

A: Yes. Both the BF240,112 and BF840,215 specify a minimum DC current gain (hFE) of 67 at 1mA collector current and 10V collector-emitter voltage. Circuit biasing calculations remain unchanged.

Q: Does the higher transition frequency of the BF840,215 (380MHz vs. 150MHz) affect circuit operation?

A: No. Higher transition frequency is a performance enhancement that does not degrade circuit function. The BF840,215 will operate correctly in circuits designed for 150MHz operation.

Q: What is the significance of the 250mW vs. 300mW power rating difference?

A: The BF840,215 has a 50mW lower maximum power dissipation rating. Verify that your circuit's actual power dissipation under worst-case conditions does not exceed 250mW. If circuit power dissipation approaches or exceeds 250mW, thermal management or circuit redesign may be necessary.

Q: Is the BF840,215 suitable for automotive applications?

A: Yes. The BF840,215 carries AEC-Q101 automotive qualification, indicating compliance with automotive reliability and quality standards.

Q: Are both parts RoHS compliant?

A: Yes. Both the BF240,112 and BF840,215 are ROHS3 Compliant and REACH Unaffected, meeting current environmental regulations.

Q: Why is the BF240,112 classified as obsolete?

A: The BF240,112 is no longer in active production. The BF840,215 represents the current active equivalent, offering improved performance characteristics and ongoing manufacturing support.