ZXTP2041FTA PNP Bipolar Transistor Equivalent & Substitute Parts

Part Overview

The ZXTP2041FTA is an active-status PNP bipolar junction transistor manufactured by Diodes Incorporated, rated for 40 V collector-emitter breakdown voltage and 1 A maximum collector current in a surface-mount SOT-23-3 package. This device is designed for general-purpose switching and amplification applications requiring moderate power dissipation (350 mW) and transition frequency performance (150 MHz). Substitute parts are identified based on matching or exceeding critical electrical parameters while maintaining compatible packaging and thermal operating ranges.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Ic) Maximum	1	A
Collector-Emitter Breakdown Voltage (Vceo)	40	V
Vce Saturation @ 100 mA, 1 A	500	mV
DC Current Gain (hFE) @ 100 mA, 5 V	300 (Min)	—
Power Dissipation Maximum	350	mW
Transition Frequency (fT)	150	MHz
Operating Temperature Range	−55 to +150	°C
Package Type	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the ZXTP2041FTA are classified into two categories based on electrical parameter compatibility:

Category 1: Direct Electrical Equivalents Parts matching all critical parameters: 1 A collector current, 40 V breakdown voltage, 500 mV saturation voltage, 300 minimum hFE, 150 MHz transition frequency, and SOT-23-3 packaging. These parts are interchangeable without circuit redesign.

Category 2: Functional Alternatives with Parameter Variations Parts that maintain the 40 V breakdown voltage and SOT-23-3 package but differ in collector current rating, power dissipation, or transition frequency. These parts are suitable for applications where the specified parameter exceeds circuit requirements.

Key Substitution Criteria:

Collector-Emitter Breakdown Voltage: 40 V minimum
Collector Current: 1 A minimum
Package: SOT-23-3 (TO-236-3, SC-59)
Mounting: Surface Mount
Operating Temperature: −55°C to +150°C minimum
RoHS3 Compliance required

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vceo (Max)	Vce Sat @ 100mA, 1A	hFE (Min) @ 100mA, 5V	Power (Max)	fT	Package	Status
ZXTP2041FTA	Diodes Incorporated	1 A	40 V	500 mV	300	350 mW	150 MHz	SOT-23-3	Active
FMMT591ATA	Diodes Incorporated	1 A	40 V	500 mV	300	500 mW	150 MHz	SOT-23-3	Active
PBSS5140T,215	Nexperia USA Inc.	1 A	40 V	500 mV	300	450 mW	150 MHz	TO-236AB	Active
PMMT591A,215	Nexperia USA Inc.	1 A	40 V	500 mV	300	250 mW	150 MHz	TO-236AB	Active
PMMT591A,235	Nexperia USA Inc.	1 A	40 V	500 mV	300	250 mW	150 MHz	TO-236AB	Active
MMBT2907ALT1G	onsemi	600 mA	60 V	1.6 V @ 50mA, 500mA	100 @ 150mA, 10V	300 mW	200 MHz	SOT-23-3	Active
MMBT2907ALT3G	onsemi	600 mA	60 V	1.6 V @ 50mA, 500mA	100 @ 150mA, 10V	300 mW	200 MHz	SOT-23-3	Active
MMBT4403LT1G	onsemi	600 mA	40 V	750 mV @ 50mA, 500mA	100 @ 150mA, 2V	300 mW	200 MHz	SOT-23-3	Active
MMBT4403LT3G	onsemi	600 mA	40 V	750 mV @ 50mA, 500mA	100 @ 150mA, 2V	300 mW	200 MHz	SOT-23-3	Active
MMBT589LT1G	onsemi	1 A	30 V	650 mV @ 200mA, 2A	100 @ 500mA, 2V	310 mW	100 MHz	SOT-23-3	Active
NSV40200LT1G	onsemi	2 A	40 V	170 mV @ 200mA, 2A	220 @ 500mA, 2V	460 mW	100 MHz	SOT-23-3	Active

Engineering Selection Recommendations

Tier 1: Direct Substitutes (Recommended for Pin-Compatible Replacement)

FMMT591ATA, PBSS5140T,215, PMMT591A,215, and PMMT591A,235 are direct electrical equivalents to the ZXTP2041FTA. All maintain 1 A collector current, 40 V breakdown voltage, 500 mV saturation voltage, and 300 minimum hFE. These parts are active-status products with ROHS3 compliance and identical operating temperature ranges. FMMT591ATA offers increased power dissipation (500 mW vs. 350 mW), providing additional thermal margin. PBSS5140T,215 includes AEC-Q100 automotive qualification. PMMT591A variants are available in two tape configurations (,215 and ,235) with reduced power dissipation (250 mW), suitable for lower-power applications.

Tier 2: Functional Alternatives (Parameter Trade-offs)

MMBT4403LT1G and MMBT4403LT3G maintain the 40 V breakdown voltage and SOT-23-3 package but are rated for 600 mA maximum collector current (below the 1 A requirement). These parts are suitable only for applications where actual collector current does not exceed 600 mA. Both are active-status products with ROHS3 compliance.

MMBT2907ALT1G and MMBT2907ALT3G provide higher breakdown voltage (60 V) and transition frequency (200 MHz) but are limited to 600 mA collector current and feature different saturation voltage characteristics. These parts are appropriate for circuits requiring higher voltage headroom with reduced current demands.

NSV40200LT1G exceeds the 1 A current rating (2 A maximum) and maintains 40 V breakdown voltage in SOT-23-3 packaging. This part is suitable for applications requiring higher current capacity with improved saturation voltage performance (170 mV vs. 500 mV).

MMBT589LT1G is rated for 1 A collector current but has a reduced breakdown voltage (30 V vs. 40 V). This part is not suitable for circuits requiring the full 40 V rating.

All substitute parts listed are active-status products with ROHS3 compliance and operating temperature ranges of −55°C to +150°C.

Frequently Asked Questions (FAQ)

Q: Can FMMT591ATA be used as a direct replacement for ZXTP2041FTA?

A: Yes. FMMT591ATA is a direct electrical equivalent with identical collector current (1 A), breakdown voltage (40 V), saturation voltage (500 mV), and current gain (300 minimum hFE). The increased power dissipation rating (500 mW vs. 350 mW) provides additional thermal margin without affecting circuit operation. Both parts use SOT-23-3 packaging and are active-status products with ROHS3 compliance.

Q: What is the difference between PMMT591A,215 and PMMT591A,235?

A: Both part numbers are electrically identical PNP transistors with 1 A collector current, 40 V breakdown voltage, and 300 minimum hFE. The suffix designates different tape configurations for automated assembly (,215 and ,235 represent different reel specifications). Selection depends on manufacturing equipment compatibility, not electrical performance.

Q: Can MMBT4403LT1G replace ZXTP2041FTA in all applications?

A: MMBT4403LT1G is not a universal replacement. While it maintains the 40 V breakdown voltage and SOT-23-3 package, its maximum collector current is 600 mA, below the 1 A rating of ZXTP2041FTA. This part is suitable only for circuits where actual collector current does not exceed 600 mA. Additionally, saturation voltage differs (750 mV vs. 500 mV), and DC current gain is lower (100 vs. 300 minimum hFE).

Q: Why does NSV40200LT1G have lower saturation voltage than ZXTP2041FTA?

A: NSV40200LT1G is rated for 2 A maximum collector current compared to 1 A for ZXTP2041FTA. The lower saturation voltage (170 mV vs. 500 mV) at specified test conditions reflects the device's design for higher current applications. This characteristic reduces power dissipation in switching circuits operating at elevated currents.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference are ROHS3 compliant and REACH unaffected, matching the compliance status of ZXTP2041FTA.

Q: What is the significance of the TO-236AB package designation?

A: TO-236AB is an alternative designation for the SOT-23-3 package used by Nexperia. Parts specified as TO-236AB (PBSS5140T,215, PMMT591A,215, PMMT591A,235) are physically and electrically compatible with SOT-23-3 devices. The package designations refer to the same three-terminal surface-mount form factor.

Q: Can MMBT2907ALT1G be used where higher voltage rating is required?

A: MMBT2907ALT1G provides 60 V breakdown voltage compared to 40 V for ZXTP2041FTA, offering increased voltage margin. However, its maximum collector current is limited to 600 mA. This part is suitable only for applications where actual collector current does not exceed 600 mA and higher voltage headroom is beneficial.

Q: Is MMBT589LT1G suitable for 40 V applications?

A: No. MMBT589LT1G has a maximum breakdown voltage of 30 V, which is below the 40 V requirement. This part is not suitable for circuits designed for 40 V operation and would risk device failure if exposed to the full rated voltage of ZXTP2041FTA.

Q: What inventory considerations apply to substitute selection?

A: Inventory availability varies among substitute parts. FMMT591ATA (72,500 pcs), PBSS5140T,215 (60,100 pcs), and MMBT4403LT1G (824,300 pcs) have substantial stock levels. PMMT591A,235 (935 pcs) and NSV40200LT1G (27,100 pcs) have more limited availability. Selection should account for supply chain requirements and lead time constraints.

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