PDTC123JQBZ Equivalent & Substitute Parts

Part Overview

The PDTC123JQBZ is a pre-biased PNP bipolar junction transistor manufactured by Nexperia USA Inc. in a 3-XDFN surface mount package with wettable flank. This device integrates internal base and emitter-base resistors, enabling direct logic-level switching applications without external biasing networks. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements.

Substiute Parts

PDTC123JQBZ

Nexperia USA Inc.In Stock: 6021PDTC123JQBZ Datasheet

Current PartRFQ

PDTC123JQB-QZ

Nexperia USA Inc.In Stock: 5797PDTC123JQB-QZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PDTC123JQBZ is constrained by the following critical parameters:

Electrical Compatibility Requirements:

• Maximum collector current: 100 mA
• Maximum collector-emitter breakdown voltage: 50 V
• Internal base resistor (R1): 2.2 kOhms
• Internal emitter-base resistor (R2): 47 kOhms
• DC current gain minimum: 100 @ 10mA, 5V
• Maximum saturation voltage: 100 mV @ 250µA, 5mA
• Maximum collector cutoff current: 100 nA

Mechanical Compatibility Requirements:

• Package type: 3-XDFN Exposed Pad (DFN1110D-3)
• Mounting: Surface Mount, Wettable Flank
• RoHS3 compliance required

The PDTC123JQB-QZ is identified as a manufacturer-recommended substitute. While this part differs in transistor polarity (NPN versus PNP), it maintains electrical parameter equivalence within the specified tolerances and shares identical mechanical packaging and compliance certifications. The substitution is valid only in applications where the polarity reversal is accommodated by circuit design.

Parameter Comparison

Engineering Selection Recommendations

The PDTC123JQB-QZ is the manufacturer-recommended substitute for the obsolete PDTC123JQBZ. Selection of this substitute is appropriate based on the following factors:

Product Status Alignment: The PDTC123JQB-QZ maintains active product status, ensuring continued availability and manufacturing support. The PDTC123JQBZ is classified as obsolete, making the substitute necessary for production continuity.

Compliance and Certification: Both parts maintain ROHS3 compliance and REACH unaffected status. The PDTC123JQB-QZ carries AEC-Q101 automotive qualification, providing additional reliability assurance for applications requiring automotive-grade components.

Electrical Parameter Equivalence: All critical electrical parameters remain identical between the main part and substitute, including collector current, breakdown voltage, internal resistor values, current gain, saturation voltage, and cutoff current. The substitute exhibits superior transition frequency (230 MHz versus 180 MHz), which does not compromise compatibility.

Moisture Sensitivity Improvement: The PDTC123JQB-QZ features MSL 1 (unlimited moisture sensitivity level) compared to MSL 3 (168 hours) for the main part, reducing handling and storage constraints.

Polarity Consideration: The primary distinction is transistor polarity: the substitute is NPN while the main part is PNP. Circuit topology must accommodate this polarity reversal. Applications utilizing complementary PNP/NPN pairs require design modification to maintain functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can the PDTC123JQB-QZ directly replace the PDTC123JQBZ without circuit modification?

A: Direct replacement is not possible without circuit modification due to transistor polarity reversal. The PDTC123JQBZ is PNP while the PDTC123JQB-QZ is NPN. Voltage supply connections and signal polarity must be adjusted accordingly. All electrical parameters remain equivalent when polarity is properly accommodated in the circuit design.

Q: Are the internal resistor values identical between these parts?

A: Yes. Both the PDTC123JQBZ and PDTC123JQB-QZ contain identical internal base resistor (R1) of 2.2 kOhms and emitter-base resistor (R2) of 47 kOhms. These integrated resistors enable direct logic-level switching without external biasing components.

Q: What is the significance of the transition frequency difference?

A: The PDTC123JQB-QZ exhibits 230 MHz transition frequency compared to 180 MHz for the PDTC123JQBZ. This higher frequency capability in the substitute does not create compatibility issues and may provide improved performance margin in high-frequency switching applications.

Q: Does the improved moisture sensitivity level affect component handling?

A: The PDTC123JQB-QZ features MSL 1 (unlimited) compared to MSL 3 (168 hours) for the main part. This improvement reduces moisture absorption constraints during storage and handling, simplifying supply chain management and reducing risk of moisture-related failures during assembly.

Q: Are both parts available in the same package?

A: Yes. Both the PDTC123JQBZ and PDTC123JQB-QZ are packaged in 3-XDFN Exposed Pad (DFN1110D-3) with surface mount, wettable flank configuration. PCB footprints and assembly processes remain identical.

Q: What compliance certifications apply to the substitute part?

A: The PDTC123JQB-QZ maintains ROHS3 compliance and REACH unaffected status identical to the main part. Additionally, it carries AEC-Q101 automotive qualification, providing enhanced reliability documentation for applications requiring automotive-grade components.

Q: Why is the main part classified as obsolete?

A: The PDTC123JQBZ is designated obsolete by the manufacturer. The PDTC123JQB-QZ remains in active production status, making it the appropriate selection for new designs and ongoing production requirements where the PNP polarity can be accommodated through circuit design.