PDTA124XT,215 Equivalent & Substitute Parts

Part Overview

The PDTA124XT,215 is a pre-biased PNP bipolar junction transistor (BJT) manufactured by Nexperia USA Inc. in the TO-236AB surface mount package. This component is designed for general-purpose switching and amplification applications requiring a 50 V collector-emitter breakdown voltage with 100 mA maximum collector current and 250 mW power dissipation. The device integrates internal base and emitter-base resistors (22 kΩ and 47 kΩ respectively), eliminating the need for external biasing networks in many circuit configurations.

The PDTA124XT,215 maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified based on matching electrical performance parameters, package compatibility, and regulatory compliance. Alternative devices may be required due to component availability, supply chain constraints, or specific application requirements for different package geometries or thermal characteristics.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP - Pre-Biased	—
Collector Current (Ic) Maximum	100	mA
Collector-Emitter Breakdown Voltage (Vceo)	50	V
Base Resistor (R1)	22	kΩ
Emitter-Base Resistor (R2)	47	kΩ
DC Current Gain (hFE) Minimum	80 @ 5mA, 5V	—
Vce Saturation Maximum	150	mV @ 500µA, 10mA
Collector Cutoff Current (ICBO)	100	nA
Power Dissipation Maximum	250	mW
Package Type	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the PDTA124XT,215 are qualified based on the following electrical and mechanical criteria:

Critical Matching Parameters:

Transistor type: PNP pre-biased configuration
Collector current rating: 100 mA maximum
Collector-emitter breakdown voltage: 50 V minimum
Base resistor value: 22 kΩ (primary criterion for biasing network compatibility)
Emitter-base resistor value: 47 kΩ (primary criterion for biasing network compatibility)
Surface mount package category: TO-236-3, SC-59, or SOT-23-3 variants
RoHS3 compliance and MSL 1 rating

Acceptable Variation Parameters:

DC current gain (hFE): Minimum 60 at specified test conditions
Vce saturation: Up to 300 mV (main part specifies 150 mV maximum)
Collector cutoff current: Up to 500 nA (main part specifies 100 nA maximum)
Power dissipation: 200 mW to 250 mW range
Transition frequency: Up to 250 MHz (where specified)

Substitutes are grouped into two categories: Direct Package Equivalents (identical TO-236AB or SC-59 packaging) and Alternative Package Options (SOT-523 or SOT-323 variants with compatible electrical specifications).

Parameter Comparison

Part Number	Manufacturer	Package	Ic (Max) mA	Vceo (Max) V	R1 (Base) kΩ	R2 (E-B) kΩ	hFE Min @ Test	Vce Sat (Max) mV	ICBO (Max) nA	Power (Max) mW	Inventory Pcs
PDTA124XT,215	Nexperia USA Inc.	TO-236AB	100	50	22	47	80 @ 5mA, 5V	150	100	250	57200
DDTA124TE-7-F	Diodes Incorporated	SOT-523	100	50	22	—	100 @ 1mA, 5V	300	500	150	9200
DDTA124TUA-7-F	Diodes Incorporated	SOT-323	100	50	22	—	100 @ 1mA, 5V	300	500	200	12300
DTA143XKAT146	Rohm Semiconductor	SMT3	100	50	4.7	10	30 @ 10mA, 5V	300	500	200	812200
MMUN2112LT1G	onsemi	SOT-23-3	100	50	22	22	60 @ 5mA, 10V	250	500	246	42300
MMUN2134LT1G	onsemi	SOT-23-3	100	50	22	47	80 @ 5mA, 10V	250	500	246	20169
MUN2112T1G	onsemi	SC-59	100	50	22	22	60 @ 5mA, 10V	250	500	230	35300
MUN2134T1G	onsemi	SC-59	100	50	22	47	80 @ 5mA, 10V	250	500	230	1139
SMMUN2134LT1G	onsemi	SOT-23-3	100	50	22	47	80 @ 5mA, 10V	250	500	246	9997

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The MMUN2134LT1G and MUN2134T1G devices from onsemi provide the closest electrical equivalence to the PDTA124XT,215. Both maintain identical base resistor (22 kΩ) and emitter-base resistor (47 kΩ) values, matching DC current gain specifications (80 @ 5mA, 10V), and equivalent Vce saturation performance (250 mV). These parts are available in SOT-23-3 (TO-236) and SC-59 packages respectively, maintaining mechanical compatibility with the original TO-236AB footprint. Both devices carry full RoHS3 compliance and MSL 1 rating.

Secondary Substitutes (Acceptable with Circuit Verification):

The SMMUN2134LT1G (onsemi, SOT-23-3) provides identical electrical specifications to the MMUN2134LT1G with equivalent performance characteristics. The MMUN2112LT1G and MUN2112T1G devices feature a 22 kΩ emitter-base resistor instead of 47 kΩ, resulting in different biasing network behavior. These parts are suitable for applications where the modified biasing network is acceptable or beneficial.

Alternative Package Options:

The DDTA124TE-7-F and DDTA124TUA-7-F from Diodes Incorporated maintain the 22 kΩ base resistor and 50 V breakdown voltage but are packaged in SOT-523 and SOT-323 formats respectively. These devices exhibit higher Vce saturation (300 mV) and collector cutoff current (500 nA) compared to the main part, requiring circuit-level evaluation for saturation-sensitive applications.

Limited Compatibility:

The DTA143XKAT146 from Rohm Semiconductor features significantly different internal resistor values (4.7 kΩ base, 10 kΩ emitter-base) and lower DC current gain (30 @ 10mA, 5V), making it unsuitable as a direct substitute despite matching voltage and current ratings. This device is listed for reference only and requires complete circuit redesign if considered.

All substitute parts maintain Active product status, RoHS3 compliance, and MSL 1 moisture sensitivity rating, ensuring regulatory and environmental compatibility with the original component.

Frequently Asked Questions (FAQ)

Q: Can the MMUN2134LT1G directly replace the PDTA124XT,215 without circuit modification?

A: Yes. The MMUN2134LT1G maintains identical base resistor (22 kΩ) and emitter-base resistor (47 kΩ) values, matching DC current gain (80 @ 5mA, 10V), and equivalent Vce saturation performance (250 mV). The SOT-23-3 package is mechanically compatible with TO-236AB footprints. No circuit modification is required.

Q: What is the difference between the MUN2134T1G and MMUN2134LT1G?

A: Both devices are manufactured by onsemi with identical electrical specifications. The MUN2134T1G is packaged in SC-59 format, while the MMUN2134LT1G uses SOT-23-3 (TO-236) packaging. Selection depends on PCB layout requirements and available footprint space. Electrical performance is equivalent.

Q: Why does the DTA143XKAT146 have different internal resistor values?

A: The DTA143XKAT146 is a different device family (DTA143 series) designed for alternative biasing network configurations. The 4.7 kΩ base resistor and 10 kΩ emitter-base resistor produce different switching characteristics and are not interchangeable with the PDTA124 series without circuit redesign.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification and MSL 1 (unlimited) moisture sensitivity rating, matching the regulatory status of the PDTA124XT,215.

Q: What is the significance of the 47 kΩ emitter-base resistor in the PDTA124XT,215?

A: The 47 kΩ emitter-base resistor is part of the internal biasing network that determines the device's switching speed and current gain characteristics. Substitutes with different R2 values (such as 22 kΩ in the MMUN2112LT1G) will exhibit different biasing behavior and may require circuit evaluation for specific applications.

Q: Can I use the DDTA124TE-7-F in a saturation-critical application?

A: The DDTA124TE-7-F exhibits 300 mV Vce saturation compared to the PDTA124XT,215's 150 mV specification. In applications requiring deep saturation or low on-state voltage drop, this difference may be significant. Circuit-level analysis is necessary to determine acceptability.

Q: What inventory levels should I consider when selecting a substitute?

A: The PDTA124XT,215 has 57,200 units in stock. The DTA143XKAT146 offers the highest substitute inventory (812,200 units), while the MUN2134T1G has the lowest (1,139 units). Inventory levels should be evaluated against project timeline and volume requirements.

Q: Are the SOT-523 and SOT-323 packages compatible with TO-236AB PCB footprints?

A: No. SOT-523 and SOT-323 packages have different pin configurations and footprints compared to TO-236AB. PCB layout modification is required if selecting DDTA124TE-7-F or DDTA124TUA-7-F. The SOT-23-3 and SC-59 packages are mechanically compatible with TO-236AB footprints.

Q: What is the maximum transition frequency specification for substitute parts?

A: The DDTA124TE-7-F, DDTA124TUA-7-F, and DTA143XKAT146 specify 250 MHz transition frequency. The PDTA124XT,215 and onsemi devices do not list transition frequency specifications. For high-frequency applications, the Diodes Incorporated and Rohm devices provide documented frequency performance.

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