PDTA124ES,126 Equivalent & Substitute Parts

Part Overview

The PDTA124ES,126 is a pre-biased PNP bipolar junction transistor (BJT) manufactured by NXP USA Inc. in a through-hole TO-92-3 package. This component integrates internal base and emitter resistors, simplifying circuit design for switching and amplification applications. The part is classified as obsolete, indicating that NXP has discontinued active production and support. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems or new designs requiring this functional specification.

Substiute Parts

PDTA124ES,126

NXP USA Inc.In Stock: 989PDTA124ES,126 Datasheet

Current PartRFQ

PDTA124EU,115

Nexperia USA Inc.In Stock: 9146PDTA124EU,115 Datasheet

MFR RecommendedRFQ

PDTA124EU,135

Nexperia USA Inc.In Stock: 11041PDTA124EU,135 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PDTA124ES,126 is determined by electrical and mechanical parameter equivalence. The critical parameters that define substitutability are:

Electrical Equivalence Criteria:

• Transistor type: PNP - Pre-Biased configuration
• Maximum collector current: 100 mA
• Collector-emitter breakdown voltage: 50 V
• Internal base resistor (R1): 22 kOhms
• Internal emitter-base resistor (R2): 22 kOhms
• DC current gain (hFE): 60 minimum at specified conditions
• Vce saturation: 150 mV maximum at specified bias conditions

Mechanical Compatibility Considerations:

• The PDTA124ES,126 uses through-hole TO-92-3 packaging
• Substitute parts PDTA124EU,115 and PDTA124EU,135 use surface-mount SOT-323 packaging
• These substitutes require circuit board redesign and different PCB layout considerations

Product Status Impact:

• PDTA124ES,126: Obsolete (discontinued)
• PDTA124EU,115: Active product status
• PDTA124EU,135: Active product status

Both substitute parts maintain identical electrical specifications and internal resistor values, ensuring functional compatibility at the component level. The transition from through-hole to surface-mount packaging represents a design change rather than a functional limitation.

Parameter Comparison

Engineering Selection Recommendations

For Direct Electrical Substitution:

PDTA124EU,115 and PDTA124EU,135 provide electrical equivalence to the PDTA124ES,126 across all critical performance parameters. Both substitute parts maintain identical internal resistor values (22 kOhms base and emitter-base resistors), collector current rating (100 mA), breakdown voltage (50 V), and DC current gain specifications. The substitutes feature improved collector cutoff current performance (100 nA versus 1 µA) and are manufactured by Nexperia USA Inc., a successor entity to NXP's semiconductor operations.

Product Status Advantage:

Both PDTA124EU,115 and PDTA124EU,135 carry active product status with AEC-Q100 automotive qualification, ensuring ongoing manufacturing support, supply chain availability, and compliance with automotive industry standards. This contrasts with the obsolete status of the PDTA124ES,126.

Packaging Transition Considerations:

The primary design change involves transitioning from through-hole TO-92-3 packaging to surface-mount SOT-323 packaging. This requires PCB layout modification and assembly process changes. The reduced power dissipation rating (200 mW versus 500 mW) in the substitute parts reflects the thermal characteristics of the smaller surface-mount package and should be evaluated against application thermal requirements.

Compliance and Regulatory Status:

All three parts maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and REACH unaffected status. The substitute parts add automotive-grade qualification (AEC-Q100), which provides additional quality and reliability assurance for applications requiring such certification.

Frequently Asked Questions (FAQ)

Q: Can PDTA124EU,115 or PDTA124EU,135 be used as direct pin-for-pin replacements for PDTA124ES,126?

A: No. While electrically equivalent, the PDTA124ES,126 uses through-hole TO-92-3 packaging, whereas PDTA124EU,115 and PDTA124EU,135 use surface-mount SOT-323 packaging. Pin-for-pin replacement is not possible without PCB redesign and assembly process modification.

Q: What are the key electrical parameters that remain identical between the main part and substitutes?

A: The transistor type (PNP - Pre-Biased), maximum collector current (100 mA), collector-emitter breakdown voltage (50 V), internal base resistor (22 kOhms), internal emitter-base resistor (22 kOhms), DC current gain (60 minimum at 5mA, 5V), and Vce saturation (150 mV maximum) are identical across all three parts.

Q: Why do the substitute parts have lower maximum power dissipation ratings?

A: The PDTA124EU,115 and PDTA124EU,135 are rated for 200 mW maximum power dissipation compared to 500 mW for the PDTA124ES,126. This difference reflects the thermal characteristics of the smaller SOT-323 surface-mount package versus the larger TO-92-3 through-hole package. Application thermal requirements must be evaluated to ensure the 200 mW rating is sufficient.

Q: Are PDTA124EU,115 and PDTA124EU,135 interchangeable with each other?

A: Yes. Both parts are electrically and mechanically identical, with the same electrical specifications, internal resistor values, package type (SOT-323), and product status (Active). The difference in part number suffixes (,115 versus ,135) reflects different manufacturing date codes or tape reel configurations but do not affect functional equivalence.

Q: What compliance certifications apply to the substitute parts?

A: PDTA124EU,115 and PDTA124EU,135 are AEC-Q100 qualified automotive-grade components. Both maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and REACH unaffected status, matching the regulatory profile of the original PDTA124ES,126.

Q: Is there a performance difference in collector cutoff current between the main part and substitutes?

A: Yes. The PDTA124ES,126 specifies a maximum collector cutoff current of 1 µA, while PDTA124EU,115 and PDTA124EU,135 specify 100 nA. The lower cutoff current in the substitutes represents improved leakage performance and does not negatively impact circuit operation.

Q: What inventory status should be considered when selecting between available parts?

A: PDTA124ES,126 has 928 pieces in stock but is obsolete. PDTA124EU,115 has 9,100 pieces available, and PDTA124EU,135 has 10,971 pieces available. Both substitutes carry active product status, ensuring continued availability and manufacturing support beyond current inventory levels.