2STX2220 Equivalent & Substitute Parts

Part Overview

The 2STX2220 is a PNP bipolar junction transistor manufactured by STMicroelectronics, designed for general-purpose switching and amplification applications. This device operates at a maximum collector current of 1.5 A with a collector-emitter breakdown voltage of 20 V and dissipates up to 900 mW. The 2STX2220 is packaged in a TO-92-3 (TO-226AA) through-hole configuration.

The 2STX2220 is classified as an obsolete product. Locating equivalent or substitute components becomes necessary when original stock is depleted or when design flexibility permits the use of active alternatives with compatible electrical and mechanical characteristics.

Key Parameters

Parameter	Value
Transistor Type	PNP
Current - Collector (Ic) (Max)	1.5 A
Voltage - Collector Emitter Breakdown (Max)	20 V
Vce Saturation (Max)	450 mV @ 150 mA, 1.5 A
Power - Max	900 mW
DC Current Gain (hFE) (Min)	200 @ 100 mA, 2 V
Mounting Type	Through Hole
Package / Case	TO-92-3
Operating Temperature (Max)	150°C (TJ)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the 2STX2220 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Transistor type must be PNP
Collector-emitter breakdown voltage must be ≥ 20 V
Maximum collector current must be ≥ 1.5 A
Maximum power dissipation must be ≥ 900 mW
Through-hole mounting configuration required

Mechanical Compatibility Requirements:

Package must be TO-92 compatible or equivalent footprint
Pin configuration must support direct substitution

The ZTX718 manufactured by Diodes Incorporated meets these substitution criteria. This device is an active product with enhanced electrical performance characteristics, including higher maximum collector current (2.5 A), improved saturation voltage (260 mV), and greater power dissipation capability (1 W). The ZTX718 is supplied in an E-Line package that is TO-92 compatible, enabling mechanical interchangeability with the 2STX2220.

Parameter Comparison

Parameter	2STX2220 (STMicroelectronics)	ZTX718 (Diodes Incorporated)	Compatibility
Transistor Type	PNP	PNP	Match
Current - Collector (Ic) (Max)	1.5 A	2.5 A	ZTX718 exceeds requirement
Voltage - Collector Emitter Breakdown (Max)	20 V	20 V	Match
Vce Saturation (Max)	450 mV @ 150 mA, 1.5 A	260 mV @ 200 mA, 2.5 A	ZTX718 superior performance
Power - Max	900 mW	1 W	ZTX718 exceeds requirement
DC Current Gain (hFE) (Min)	200 @ 100 mA, 2 V	150 @ 2 A, 2 V	2STX2220 higher at specified point
Mounting Type	Through Hole	Through Hole	Match
Package / Case	TO-92-3	E-Line (TO-92 compatible)	Compatible footprint
Operating Temperature (Max)	150°C (TJ)	200°C (TJ)	ZTX718 extended range
Product Status	Obsolete	Active	ZTX718 actively manufactured
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match

Engineering Selection Recommendations

Primary Substitute: ZTX718

The ZTX718 is the qualified substitute for the 2STX2220. Selection of the ZTX718 is supported by the following factors:

Product Status: The ZTX718 is an active product manufactured by Diodes Incorporated, ensuring ongoing availability and supply chain reliability. The 2STX2220 is obsolete, making the ZTX718 the appropriate long-term alternative.

Electrical Performance: The ZTX718 meets or exceeds all critical electrical parameters of the 2STX2220. Maximum collector current is increased to 2.5 A, maximum power dissipation is increased to 1 W, and saturation voltage is reduced to 260 mV, providing superior switching characteristics.

Mechanical Compatibility: The ZTX718 E-Line package is TO-92 compatible, enabling direct substitution in existing through-hole PCB layouts without modification.

Regulatory Compliance: Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment across applications.

Temperature Performance: The ZTX718 supports an extended operating temperature range to 200°C, providing additional thermal margin compared to the 2STX2220 maximum of 150°C.

Frequently Asked Questions (FAQ)

Q: Can the ZTX718 be used as a direct replacement for the 2STX2220 in existing designs?

A: Yes. The ZTX718 is electrically and mechanically compatible with the 2STX2220. Both devices are PNP transistors with identical 20 V collector-emitter breakdown voltage, through-hole mounting, and TO-92 compatible packaging. The ZTX718 provides enhanced performance with higher current and power ratings.

Q: What are the key differences between the 2STX2220 and ZTX718?

A: The ZTX718 offers higher maximum collector current (2.5 A versus 1.5 A), greater power dissipation (1 W versus 900 mW), lower saturation voltage (260 mV versus 450 mV), and extended operating temperature range (−55°C to 200°C versus up to 150°C). The ZTX718 is an active product, while the 2STX2220 is obsolete.

Q: Are there any package compatibility concerns when substituting the ZTX718 for the 2STX2220?

A: No. The ZTX718 E-Line package is specified as TO-92 compatible, ensuring pin-for-pin mechanical compatibility with the 2STX2220 TO-92-3 package. Both devices use identical three-pin through-hole configurations.

Q: Do both devices meet the same regulatory requirements?

A: Yes. Both the 2STX2220 and ZTX718 are ROHS3 compliant and REACH unaffected, meeting current regulatory standards for electronic components.

Q: What is the DC current gain difference between these devices?

A: The 2STX2220 specifies a minimum DC current gain (hFE) of 200 at 100 mA and 2 V. The ZTX718 specifies a minimum DC current gain of 150 at 2 A and 2 V. The gain specifications are measured at different collector current levels, reflecting the different operating points of each device.

Q: Is the ZTX718 suitable for high-temperature applications?

A: The ZTX718 supports operation up to 200°C junction temperature, compared to 150°C for the 2STX2220. This extended temperature range makes the ZTX718 suitable for applications requiring higher thermal performance.

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