DZT491-13 Equivalent & Substitute Parts

Part Overview

The DZT491-13 is an NPN bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-223-3 package. This component operates at a maximum collector current of 1 A with a collector-emitter breakdown voltage of 60 V, making it suitable for general-purpose switching and amplification circuits. The 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 while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	1	A
Voltage - Collector Emitter Breakdown (Max)	60	V
Vce Saturation (Max) @ Ib, Ic	500mV @ 100mA, 1A	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 500mA, 5V	—
Power - Max	1	W
Frequency - Transition	150	MHz
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-261-4, TO-261AA	—
Supplier Device Package	SOT-223-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the DZT491-13 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN configuration required
Collector-Emitter Breakdown Voltage: Minimum 60 V (equal or greater)
Maximum Collector Current: 1 A or greater
Vce Saturation: 500 mV or less at specified base and collector currents
Collector Cutoff Current: 100 nA or less
DC Current Gain (hFE): Minimum 100 at specified operating points
Transition Frequency: 150 MHz or greater
Operating Temperature Range: Must include -55°C to 150°C or equivalent maximum junction temperature of 150°C
Mounting Type: Surface Mount required
Package Compatibility: SOT-223 family packages (SOT-223-3 or SOT-223-4)
Compliance: ROHS3 compliant, MSL 1 rating

Substitution Categories:

Direct Equivalents (Identical Electrical Performance): Parts meeting all primary criteria with identical or superior power dissipation ratings and active product status.

Functional Equivalents (Enhanced Performance): Parts exceeding primary criteria in collector current capacity, power dissipation, or transition frequency while maintaining voltage and gain specifications.

Conditional Equivalents (Voltage or Gain Variations): Parts with reduced collector-emitter breakdown voltage (45 V) or modified DC current gain characteristics, suitable only for applications with reduced voltage margins.

Parameter Comparison

Part Number	Manufacturer	Ic Max (A)	Vce Breakdown (V)	Power Max (W)	Frequency (MHz)	hFE Min @ Ic, Vce	Product Status	Package
DZT491-13	Diodes Incorporated	1	60	1	150	100 @ 500mA, 5V	Obsolete	SOT-223-3
FZT491TA	Diodes Incorporated	1	60	2	150	100 @ 500mA, 5V	Active	SOT-223-3
2STN1360	STMicroelectronics	3	60	1.6	130	160 @ 1A, 2V	Active	SOT-223
BCP54-16,115	Nexperia USA Inc.	1	45	0.96	180	100 @ 150mA, 2V	Active	SOT-223
BCP54-16,135	Nexperia USA Inc.	1	45	0.96	180	100 @ 150mA, 2V	Active	SOT-223
BCP55	onsemi	1.5	60	1.5	—	40 @ 150mA, 2V	Active	SOT-223-4
BCP55,115	Nexperia USA Inc.	1	60	1.35	180	63 @ 150mA, 2V	Active	SOT-223
BCP55,135	Nexperia USA Inc.	1	60	1.35	180	63 @ 150mA, 2V	Active	SOT-223
BCP55-10,115	Nexperia USA Inc.	1	60	1.35	180	63 @ 150mA, 2V	Active	SOT-223
BCP55-16,115	Nexperia USA Inc.	1	60	1.35	180	100 @ 150mA, 2V	Active	SOT-223
BCP55H6327XTSA1	Infineon Technologies	1	60	2	100	40 @ 150mA, 2V	Obsolete	SOT-223-4

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended for New Designs):

The FZT491TA from Diodes Incorporated is the primary recommended substitute. This part maintains identical electrical specifications to the DZT491-13 across all critical parameters: 1 A collector current, 60 V breakdown voltage, 100 minimum DC current gain, and 150 MHz transition frequency. The FZT491TA offers enhanced power dissipation (2 W versus 1 W), providing additional thermal margin. The part is manufactured by the same supplier as the original component, ensuring design continuity and supply chain reliability. Active product status guarantees long-term availability and manufacturing support. ROHS3 compliance and MSL 1 rating are maintained.

Tier 2 - Enhanced Performance Substitutes (Applications Requiring Higher Current Capacity):

The 2STN1360 from STMicroelectronics provides enhanced collector current capacity (3 A maximum) while maintaining the 60 V breakdown voltage specification. This part is suitable for applications where increased current headroom is beneficial. The transition frequency of 130 MHz meets the minimum requirement, though it is slightly lower than the original specification. The part is active and ROHS3 compliant.

The BCP55 series from onsemi (base part number) offers 1.5 A collector current capacity with 60 V breakdown voltage and enhanced power dissipation (1.5 W). This series is available in multiple packaging configurations and supplier variants. Active product status and full compliance certifications are maintained across all BCP55 variants.

Tier 3 - Conditional Substitutes (Reduced Voltage Applications Only):

The BCP54-16,115 and BCP54-16,135 from Nexperia USA Inc. are suitable only for applications where the collector-emitter breakdown voltage requirement can be reduced to 45 V. These parts maintain 1 A collector current and 100 minimum DC current gain specifications. The transition frequency of 180 MHz exceeds the original requirement. These parts are active and ROHS3 compliant but must not be used in circuits requiring the full 60 V voltage rating.

Obsolete Parts (Not Recommended for New Designs):

The BCP55H6327XTSA1 from Infineon Technologies is classified as obsolete and should not be selected for new designs despite meeting electrical specifications. This part is retained in the reference for legacy system maintenance only.

Frequently Asked Questions (FAQ)

Q: Can the FZT491TA be used as a direct drop-in replacement for the DZT491-13?

A: Yes. The FZT491TA maintains identical electrical specifications across all critical parameters: NPN configuration, 1 A collector current, 60 V breakdown voltage, 500 mV saturation voltage, 100 minimum DC current gain, and 150 MHz transition frequency. Both parts use the SOT-223-3 package and are ROHS3 compliant with MSL 1 rating. The FZT491TA provides superior power dissipation (2 W versus 1 W), making it a direct replacement with enhanced thermal performance.

Q: What is the difference between the various BCP55 part numbers (BCP55, BCP55,115, BCP55,135, BCP55-10,115, BCP55-16,115)?

A: These designations represent different packaging configurations and supplier variants of the same base part (BCP55). The suffixes indicate packaging type (Cut Tape, Tape & Reel) and supplier-specific codes. Electrically, BCP55,115, BCP55,135, BCP55-10,115, and BCP55-16,115 are functionally equivalent, all offering 1 A collector current and 60 V breakdown voltage. The base BCP55 from onsemi offers 1.5 A collector current. Selection should be based on packaging requirements and supplier availability.

Q: Why is the 2STN1360 listed as a substitute if it has 3 A collector current instead of 1 A?

A: The 2STN1360 is a functional equivalent that exceeds the original specification in collector current capacity. It maintains the critical voltage specification (60 V breakdown) and meets the minimum DC current gain requirement (160 minimum at 1 A, 2 V). The higher current rating provides design flexibility for applications requiring increased current capacity while maintaining full voltage compatibility. This part is suitable for designs where the additional current margin is beneficial.

Q: Can BCP54-16,115 be used in place of DZT491-13?

A: The BCP54-16,115 can be used only in applications where the collector-emitter breakdown voltage can be reduced from 60 V to 45 V. This part maintains 1 A collector current and 100 minimum DC current gain. The transition frequency of 180 MHz exceeds the original requirement. This substitution is conditional and requires verification that the circuit design does not require the full 60 V voltage rating.

Q: What is the significance of the operating temperature specification?

A: The DZT491-13 specifies an operating temperature range of -55°C to 150°C (junction temperature). Substitute parts must maintain this range or equivalent maximum junction temperature of 150°C. All recommended substitutes meet this requirement, ensuring thermal compatibility across the full operating range.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the original DZT491-13. This ensures regulatory compliance and manufacturing process compatibility.

Q: What is the difference between SOT-223-3 and SOT-223-4 packages?

A: The SOT-223-3 package contains three leads (base, collector, emitter), while the SOT-223-4 package contains four leads, typically adding a thermal pad or additional connection. Both packages are mechanically compatible with TO-261-4 and TO-261AA footprints. Selection between these packages depends on PCB layout requirements and thermal management needs. The SOT-223-3 is the standard configuration for the DZT491-13.

Q: Why is the BCP55H6327XTSA1 marked as obsolete?

A: The BCP55H6327XTSA1 from Infineon Technologies is classified as obsolete by the manufacturer, indicating discontinued production and limited future availability. Although this part meets electrical specifications, it should not be selected for new designs. This part is retained in the reference for legacy system maintenance and repair purposes only.

Q: How should I select between active substitute parts?

A: Selection should prioritize active product status and long-term availability. The FZT491TA is the primary recommendation as it is manufactured by the same supplier as the original part and maintains identical specifications with enhanced power dissipation. For applications requiring higher current capacity, the 2STN1360 or BCP55 series are suitable alternatives. Conditional substitutes (BCP54 series) should be used only when voltage requirements permit reduction to 45 V.

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