BC184LC_L34Z Equivalent & Substitute Parts

Part Overview

The BC184LC_L34Z is an NPN bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a maximum collector current of 200 mA, collector-emitter breakdown voltage of 30 V, and a maximum power dissipation of 625 mW in a through-hole TO-92-3 package. The BC184LC_L34Z is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

BC184LC_L34Z

onsemiIn Stock: 1134BC184LC_L34Z Datasheet

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2N4123 PBFREE

Central Semiconductor CorpIn Stock: 10982N4123 PBFREE Datasheet

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BC184B PBFREE

Central Semiconductor CorpIn Stock: 859BC184B PBFREE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BC184LC_L34Z is determined by strict equivalence across the following critical electrical and mechanical parameters:

Mandatory Matching Parameters:

• Transistor Type: NPN
• Current - Collector (Ic) Max: 200 mA
• Voltage - Collector Emitter Breakdown (Max): 30 V
• Mounting Type: Through Hole
• Package / Case: TO-92-3

Allowable Parameter Variations: Substitute parts may exceed the original specifications in the following parameters without compromising circuit compatibility:

• Vce Saturation (Max): May be lower than 600 mV
• Current - Collector Cutoff (Max): May be lower than 15 nA
• DC Current Gain (hFE): May be higher than 130
• Power - Max: May be higher than 625 mW
• Frequency - Transition: May be higher than 150 MHz
• Operating Temperature Range: May be wider than the original specification

The substitute parts identified below meet all mandatory matching parameters and provide equal or superior performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

2N4123 PBFREE (Central Semiconductor Corp)

The 2N4123 PBFREE meets all mandatory electrical and mechanical parameters for direct substitution. This part is classified as Active product status, ensuring long-term availability and supply chain continuity. The device is ROHS3 compliant and REACH unaffected, satisfying modern regulatory requirements. The 2N4123 PBFREE provides superior performance margins with higher maximum power dissipation (1.5 W versus 625 mW) and higher transition frequency (250 MHz versus 150 MHz). The extended operating temperature range (−65 °C to 150 °C) provides broader environmental compatibility. Current inventory of 1053 pieces supports immediate procurement.

BC184B PBFREE (Central Semiconductor Corp)

The BC184B PBFREE is a direct functional equivalent sharing the same base product number (BC184) as the original part. This device meets all mandatory electrical and mechanical parameters and is classified as Active product status. ROHS3 compliance and REACH unaffected status satisfy regulatory requirements. The BC184B PBFREE provides enhanced transition frequency (280 MHz versus 150 MHz) and superior DC current gain characteristics (250 @ 2 mA, 5 V). The extended operating temperature range (−65 °C to 150 °C) offers improved environmental flexibility. Current inventory of 819 pieces supports procurement requirements.

Both substitute parts provide equivalent or superior electrical performance while offering improved product status, regulatory compliance, and supply availability compared to the obsolete BC184LC_L34Z.

Frequently Asked Questions (FAQ)

Q: Can the 2N4123 PBFREE be used as a direct replacement for the BC184LC_L34Z in existing designs?

A: Yes. The 2N4123 PBFREE meets all mandatory electrical parameters (NPN type, 200 mA maximum collector current, 30 V breakdown voltage) and uses the identical TO-92-3 through-hole package. No circuit modifications are required for pin-compatible substitution.

Q: What is the primary difference between the 2N4123 PBFREE and BC184B PBFREE substitutes?

A: Both parts meet the mandatory substitution criteria. The 2N4123 PBFREE provides higher maximum power dissipation (1.5 W) and lower saturation voltage (300 mV @ 5 mA, 50 mA), making it suitable for applications requiring lower on-state losses. The BC184B PBFREE provides higher DC current gain (250 @ 2 mA, 5 V) and identical saturation voltage to the original part, making it suitable for applications requiring higher amplification or lower base drive requirements.

Q: Are the substitute parts lead-free?

A: Yes. Both the 2N4123 PBFREE and BC184B PBFREE are lead-free (PBFREE designation) and ROHS3 compliant, meeting modern environmental and regulatory standards.

Q: What is the significance of the "Active" product status for the substitute parts?

A: Active product status indicates that the manufacturer actively produces and supports the device, ensuring long-term availability, consistent supply, and ongoing technical support. This contrasts with the BC184LC_L34Z, which is classified as Obsolete and subject to discontinuation and supply constraints.

Q: Can these transistors be used in high-frequency applications?

A: The substitute parts support higher transition frequencies than the original BC184LC_L34Z. The 2N4123 PBFREE operates at 250 MHz and the BC184B PBFREE at 280 MHz, compared to 150 MHz for the original part. Both are suitable for general-purpose switching and low-frequency amplification applications within their specified frequency ranges.

Q: Are there any thermal considerations when substituting these parts?

A: The substitute parts support the same maximum junction temperature (150 °C) as the original part but offer extended operating temperature ranges (−65 °C to 150 °C). The 2N4123 PBFREE provides higher maximum power dissipation (1.5 W), allowing greater thermal headroom in power-limited applications. Thermal design should be verified based on specific circuit requirements and ambient conditions.

Q: Is the TO-92-3 package identical across all three parts?

A: Yes. All three parts use the TO-92-3 (TO-226AA) through-hole package with identical pin configuration and mechanical dimensions, enabling direct physical substitution without PCB modifications.