ZUMT591TC Equivalent & Substitute Parts

Part Overview

The ZUMT591TC is a Surface Mount PNP Bipolar Junction Transistor manufactured by Diodes Incorporated, rated for 60V collector-emitter breakdown voltage and 1A maximum collector current in a SOT-323 package. This device is classified as Obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. The ZUMT591TC remains available in limited inventory (985 Pcs), making alternative sourcing critical for production applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Maximum Collector Current (Ic)	1	A
Collector-Emitter Breakdown Voltage (Max)	60	V
Vce Saturation @ 100mA, 1A	600	mV
Maximum Power Dissipation	500	mW
Transition Frequency	150	MHz
DC Current Gain (hFE) @ 500mA, 5V	100	—
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-323 (SC-70)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution eligibility for the ZUMT591TC is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor polarity (PNP)
Package type (SOT-323)
Collector-emitter breakdown voltage (60V minimum)
Maximum collector current (1A or greater)
Surface mount configuration

Secondary Compatibility Factors:

Operating temperature range (-55°C to 150°C or broader)
Power dissipation capability (500mW or greater)
Transition frequency (150MHz or higher)
DC current gain (hFE ≥ 100 @ specified conditions)

Substitute parts must satisfy all primary criteria and maintain compatibility with secondary parameters to ensure functional equivalence in circuit applications.

Parameter Comparison

Parameter	ZUMT591TC	ZUMT591TA	PBSS5160U,115
Manufacturer	Diodes Incorporated	Diodes Incorporated	Nexperia USA Inc.
Product Status	Obsolete	Active	Active
Transistor Type	PNP	PNP	PNP
Ic (Max)	1 A	1 A	700 mA
Vce Breakdown (Max)	60 V	60 V	60 V
Vce Saturation @ 100mA, 1A	600 mV	600 mV	340 mV
Ic Cutoff (Max)	100 nA	100 nA	100 nA
hFE (Min) @ 500mA, 5V	100	100	150
Power (Max)	500 mW	500 mW	415 mW
Frequency - Transition	150 MHz	150 MHz	185 MHz
Operating Temperature	-55 to 150 °C	-55 to 150 °C	to 150 °C
Package / Case	SOT-323	SOT-323	SOT-323
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

ZUMT591TA (Diodes Incorporated)

The ZUMT591TA is a parametric equivalent to the ZUMT591TC with identical electrical specifications and package configuration. The primary distinction is product status: ZUMT591TA is Active with significantly higher inventory availability (86,200 Pcs). Both devices share the same base product number (ZUMT591) and are manufactured by Diodes Incorporated. The ZUMT591TA is packaged in Tape & Reel format, suitable for automated assembly processes. This part is the direct replacement for obsolete ZUMT591TC applications requiring no circuit redesign.

PBSS5160U,115 (Nexperia USA Inc.)

The PBSS5160U,115 is a manufacturer-recommended substitute from Nexperia USA Inc., offering enhanced performance characteristics within the same SOT-323 package envelope. This device maintains the 60V collector-emitter breakdown voltage specification but operates at reduced maximum collector current (700mA versus 1A). The PBSS5160U,115 provides superior saturation voltage performance (340mV versus 600mV), higher DC current gain (150 versus 100), and increased transition frequency (185MHz versus 150MHz). This part carries AEC-Q100 automotive qualification and is suitable for applications where the 700mA current rating is sufficient. The PBSS5160U,115 is Active with robust inventory (20,402 Pcs).

Selection Criteria:

Use ZUMT591TA for direct replacement requiring identical electrical performance and Diodes Incorporated sourcing continuity
Use PBSS5160U,115 for applications where maximum collector current can be limited to 700mA and improved saturation characteristics are beneficial
All three parts comply with ROHS3 and maintain MSL-1 moisture sensitivity ratings

Frequently Asked Questions (FAQ)

Q: Can ZUMT591TA directly replace ZUMT591TC without circuit modification?

A: Yes. The ZUMT591TA is a parametric equivalent with identical electrical specifications, operating temperature range, and SOT-323 package configuration. No circuit redesign is required.

Q: What is the primary difference between ZUMT591TC and ZUMT591TA?

A: Product status and packaging format. ZUMT591TC is Obsolete with limited inventory; ZUMT591TA is Active with Tape & Reel packaging and significantly higher stock availability.

Q: Can PBSS5160U,115 replace ZUMT591TC in all applications?

A: PBSS5160U,115 is suitable only for applications where maximum collector current requirements do not exceed 700mA. The device offers improved saturation voltage and transition frequency but reduced maximum current rating. Circuit analysis is required to confirm current compatibility.

Q: Are all three parts compatible with the same PCB footprint?

A: Yes. All three devices use the SOT-323 (SC-70) package and are Surface Mount components with identical pin configurations and land patterns.

Q: What compliance certifications apply to these substitute parts?

A: All three parts are ROHS3 compliant, REACH unaffected, and carry MSL-1 moisture sensitivity ratings. PBSS5160U,115 additionally holds AEC-Q100 automotive qualification.

Q: Which substitute part offers the best long-term availability?

A: ZUMT591TA provides the highest inventory level (86,200 Pcs) and Active product status, ensuring sustained availability for production requirements.

Q: How do the saturation voltage characteristics differ between these parts?

A: ZUMT591TC and ZUMT591TA both specify 600mV saturation voltage at 100mA and 1A conditions. PBSS5160U,115 specifies 340mV saturation voltage, providing lower on-state voltage drop and reduced power dissipation in saturated switching applications.

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