QST7TR Equivalent & Substitute Parts Reference

Part Overview

The QST7TR, manufactured by Rohm Semiconductor, is a PNP bipolar junction transistor (BJT) in the Transistors, Bipolar (BJT) category. It is specified as a surface mount device with a maximum collector current of 1.5 A, collector-emitter breakdown voltage of 30 V, transition frequency of 280 MHz, and a power rating of 500 mW. This product is categorized as “Not For New Designs,” necessitating the evaluation and selection of direct substitute models that meet equivalent electrical and mechanical parameters for continued assembly lines and designs.

Key Parameters

Parameter	QST7TR
Transistor Type	PNP
Current - Collector (Ic) (Max)	1.5 A
Voltage - Collector Emitter Breakdown (Max)	30 V
Vce Saturation (Max) @ Ib, Ic	370mV @ 50mA, 1A
Current - Collector Cutoff (Max)	100nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	270 @ 100mA, 2V
Power - Max	500 mW
Frequency - Transition	280MHz
Operating Temperature	150°C (TJ)
Mounting Type	Surface Mount
Package / Case	SOT-23-6 Thin, TSOT-23-6
Supplier Device Package	TSMT6 (SC-95)

Substitute Part Grouping Explanation

Substitute selection for the QST7TR is based strictly on alignment with key electrical and mechanical characteristics: transistor type (PNP), maximum collector current, collector-emitter breakdown voltage, saturation voltage, collector cutoff current, minimum DC current gain, maximum power rating, transition frequency, operating temperature, mounting type, and packaging. All substitute parts must equal or exceed these attributes and match mounting and package requirements.

Parameter Comparison

Parameter	QST7TR (Rohm Semiconductor)	PBSS4032PD,115 (NXP Semiconductors)
Transistor Type	PNP	PNP
Current - Collector (Ic) (Max)	1.5 A	2.7 A
Voltage - Collector Emitter Breakdown (Max)	30 V	30 V
Vce Saturation (Max) @ Ib, Ic	370mV @ 50mA, 1A	395mV @ 300mA, 3A
Current - Collector Cutoff (Max)	100nA (ICBO)	100nA
DC Current Gain (hFE) (Min) @ Ic, Vce	270 @ 100mA, 2V	200 @ 1A, 2V
Power - Max	500 mW	1 W
Frequency - Transition	280MHz	104MHz
Operating Temperature	150°C (TJ)	150°C (TJ)
Mounting Type	Surface Mount	Surface Mount
Package / Case	SOT-23-6 Thin, TSOT-23-6	SC-74, SOT-457
Supplier Device Package	TSMT6 (SC-95)	6-TSOP

Engineering Selection Recommendations

The QST7TR is designated “Not For New Designs,” while PBSS4032PD,115 is classified as “Active.” Both devices are RoHS and REACH compliant and have a most stringent moisture sensitivity rating of 1 (Unlimited). When selecting a substitute, review the product status, compliance parameters, and environmental certifications explicitly provided.

Frequently Asked Questions (FAQ)

Q: What are the critical parameters for substituting the QST7TR?
A: The essential criteria are transistor type (PNP), maximum collector current, collector-emitter breakdown voltage, saturation voltage, collector cutoff current, minimum DC current gain, maximum power rating, transition frequency, operating temperature, mounting type, and package.

Q: Can PBSS4032PD,115 be used as a substitute for QST7TR?
A: PBSS4032PD,115 matches the core electrical parameters and mounting type. However, the package differs (SC-74, SOT-457 vs SOT-23-6 Thin, TSOT-23-6), which should be confirmed for physical compatibility.

Q: What compliance standards must be considered for substitute parts?
A: Both QST7TR and PBSS4032PD,115 are RoHS compliant and REACH unaffected, and both have Moisture Sensitivity Level (MSL) 1 (Unlimited).

Q: Why is substitution necessary for QST7TR?
A: The QST7TR is marked “Not For New Designs,” indicating that alternative active models are needed to maintain product lifecycle and ensure continued availability.

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