PZTA92 PNP Bipolar Junction Transistor Equivalent & Substitute Parts

Part Overview

The PZTA92 is a PNP bipolar junction transistor manufactured by onsemi, rated for 300 V collector-emitter breakdown voltage and 500 mA maximum collector current in a surface mount SOT-223-4 package. This device is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, and thermal characteristics while accommodating variations in packaging and performance specifications.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	300	V
Current - Collector (Ic) (Max)	500	mA
Vce Saturation (Max) @ Ib, Ic	500mV @ 2mA, 20mA	—
Current - Collector Cutoff (Max)	250	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	25 @ 30mA, 10V	—
Power - Max	1	W
Frequency - Transition	50	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-261-4, TO-261AA	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the PZTA92 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor polarity: PNP type required
Voltage rating: Minimum 300 V collector-emitter breakdown voltage
Current capacity: Minimum 500 mA collector current for full-current substitutes
Saturation voltage: 500 mV maximum at specified base and collector currents
Collector cutoff current: Maximum 250 nA
DC current gain: Minimum 25 at 30 mA collector current, 10 V Vce
Transition frequency: Minimum 50 MHz
Operating temperature: Support for -55°C to 150°C range
Package compatibility: Surface mount SOT-223 or equivalent footprint

Substitute Categories:

Direct Electrical Equivalents (500 mA Rating): Parts maintaining identical or superior electrical specifications across all critical parameters with 500 mA collector current capacity.
Reduced Current Substitutes (100 mA Rating): Parts with identical voltage and frequency ratings but reduced collector current capacity to 100 mA, suitable for lower-power applications.
Parametric Equivalents: Parts with matching core electrical specifications but variations in secondary parameters such as power dissipation or transition frequency.

Parameter Comparison

Parameter	PZTA92	PZTA92T1G	FZT757TA	PXTA92,115	PZTA92,115	DZTA92-13
Manufacturer	onsemi	onsemi	Diodes Inc.	Nexperia	Nexperia	Diodes Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP
Ic (Max)	500 mA	500 mA	500 mA	100 mA	100 mA	500 mA
Vce Breakdown (Max)	300 V	300 V	300 V	300 V	300 V	300 V
Vce Saturation (Max)	500mV @ 2mA, 20mA	500mV @ 2mA, 20mA	500mV @ 10mA, 100mA	500mV @ 2mA, 20mA	500mV @ 2mA, 20mA	500mV @ 2mA, 20mA
Icbo (Max)	250 nA	250 nA	100 nA	250 nA	20 nA	250 nA
hFE (Min) @ Ic, Vce	25 @ 30mA, 10V	40 @ 30mA, 10V	50 @ 100mA, 5V	25 @ 30mA, 10V	25 @ 30mA, 10V	25 @ 30mA, 10V
Power (Max)	1 W	1.5 W	2 W	1.3 W	1.2 W	1 W
Frequency - Transition	50 MHz	50 MHz	30 MHz	50 MHz	50 MHz	50 MHz
Operating Temperature	-55 to 150°C	150°C	-55 to 150°C	150°C	150°C	-55 to 150°C
Package	SOT-223-4	SOT-223	SOT-223-3	SOT-89	SOT-223	SOT-223-3
RoHS Status	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3
MSL	1	1	1	1	1	1

Engineering Selection Recommendations

PZTA92T1G (onsemi) — Recommended as primary substitute for direct replacement. Active product status ensures ongoing availability. Maintains identical voltage rating (300 V), collector current (500 mA), saturation voltage, and transition frequency (50 MHz). Enhanced DC current gain (40 vs. 25) and increased power rating (1.5 W vs. 1 W) provide improved performance margin. Identical package footprint (SOT-223) and RoHS3 compliance. Operating temperature specification limited to 150°C maximum (vs. -55 to 150°C for original), requiring verification for applications requiring full temperature range operation.

DZTA92-13 (Diodes Incorporated) — Parametric equivalent suitable for applications requiring full electrical specification match. Maintains 500 mA collector current, 300 V voltage rating, 50 MHz transition frequency, and identical saturation voltage specifications. Supports full operating temperature range (-55 to 150°C). SOT-223-3 package footprint compatible with original TO-261-4 pinout. Active product status with established supply chain.

FZT757TA (Diodes Incorporated) — Acceptable substitute for applications not requiring 50 MHz transition frequency. Maintains 500 mA collector current and 300 V voltage rating with superior power dissipation (2 W). Transition frequency reduced to 30 MHz. Supports full operating temperature range (-55 to 150°C). Lower collector cutoff current (100 nA vs. 250 nA) provides improved leakage characteristics. SOT-223-3 package footprint compatible.

PXTA92,115 (Nexperia) and PZTA92,115 (Nexperia) — Suitable for applications with collector current requirements of 100 mA or less. Both parts maintain 300 V voltage rating and 50 MHz transition frequency. PXTA92,115 uses SOT-89 package; PZTA92,115 uses SOT-223 package. Both qualified to AEC-Q101 automotive standard. Operating temperature limited to 150°C maximum. PZTA92,115 exhibits superior collector cutoff current specification (20 nA vs. 250 nA).

Frequently Asked Questions (FAQ)

Q: Can PZTA92T1G be used as a direct replacement for PZTA92 in all applications?

A: PZTA92T1G is electrically compatible for applications operating within the -55°C to 150°C range. However, the PZTA92T1G operating temperature specification is limited to 150°C maximum, whereas the original PZTA92 supports -55°C to 150°C. Applications requiring operation below 0°C require verification against PZTA92T1G datasheet specifications or selection of alternative substitutes such as DZTA92-13 or FZT757TA, which support the full temperature range.

Q: What is the difference between 500 mA and 100 mA rated substitutes?

A: The PZTA92 is rated for 500 mA maximum collector current. Substitutes PXTA92,115 and PZTA92,115 are rated for 100 mA maximum collector current. These reduced-current parts are suitable only for applications where the circuit design limits collector current to 100 mA or less. Applications requiring 500 mA collector current capacity must use PZTA92T1G, DZTA92-13, or FZT757TA.

Q: Are the SOT-223-3 and SOT-223-4 packages pin-compatible?

A: SOT-223-3 and SOT-223-4 packages differ in pin count and pinout configuration. SOT-223-4 includes four pins, while SOT-223-3 includes three pins. Footprint compatibility depends on circuit board design. Verify pinout against schematic and PCB layout before substitution. Consult device datasheets for detailed pin assignments.

Q: Which substitute offers the best thermal performance?

A: FZT757TA provides the highest power dissipation rating at 2 W, compared to 1 W for PZTA92 and 1.5 W for PZTA92T1G. For applications requiring maximum thermal headroom, FZT757TA is the preferred selection. However, transition frequency is reduced to 30 MHz, which may not be suitable for high-frequency switching applications.

Q: Are all substitutes RoHS3 compliant?

A: All listed substitute parts are RoHS3 compliant and carry MSL rating of 1 (Unlimited), matching the original PZTA92 specifications. All parts are suitable for lead-free soldering processes.

Q: What is the significance of DC current gain (hFE) differences between substitutes?

A: DC current gain variations affect base drive requirements and switching speed. PZTA92T1G (hFE 40) and FZT757TA (hFE 50) provide higher current gain than the original PZTA92 (hFE 25), reducing base current requirements. For circuits designed with specific base drive calculations, verify that higher hFE values do not cause unintended circuit behavior such as excessive saturation or reduced switching speed.

Q: Can FZT757TA be used in applications requiring 50 MHz operation?

A: FZT757TA is rated for 30 MHz transition frequency, which is lower than the original PZTA92 specification of 50 MHz. Applications requiring 50 MHz switching frequency or higher must use PZTA92T1G, PXTA92,115, PZTA92,115, or DZTA92-13, all rated for 50 MHz transition frequency.

Q: Are Nexperia parts (PXTA92,115 and PZTA92,115) suitable for automotive applications?

A: Both PXTA92,115 and PZTA92,115 carry AEC-Q101 automotive qualification, making them suitable for automotive applications. However, both parts are limited to 100 mA collector current and 150°C maximum operating temperature. Verify compliance with specific automotive application requirements before selection.

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