BCX19TC Equivalent & Substitute Parts Reference

Part Overview

The BCX19TC is an NPN bipolar junction transistor manufactured by Diodes Incorporated, rated for 45 V collector-emitter breakdown voltage and 500 mA maximum collector current. This device is packaged in SOT-23-3 (TO-236-3) surface mount configuration with a maximum power dissipation of 330 mW and transition frequency of 200 MHz. The BCX19TC is classified as obsolete product status, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector-Emitter Breakdown Voltage (Max)	45	V
Collector Current (Max)	500	mA
Vce Saturation @ Ib, Ic	620 mV @ 50 mA, 500 mA	—
Collector Cutoff Current (Max)	100	nA
DC Current Gain (hFE Min) @ Ic, Vce	100 @ 100 mA, 1 V	—
Power Dissipation (Max)	330	mW
Transition Frequency	200	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	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BCX19TC is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Transistor type: NPN
Collector-emitter breakdown voltage: 45 V minimum
Maximum collector current: 500 mA
DC current gain (hFE): 100 minimum at specified test conditions
Package: SOT-23-3 (TO-236-3) surface mount
Mounting type: Surface mount
RoHS compliance: ROHS3 Compliant
Moisture sensitivity: MSL 1

Secondary Compatibility Parameters:

Vce saturation characteristics
Collector cutoff current
Power dissipation capability
Transition frequency
Operating temperature range
Product status (active preferred for obsolete parts)

Substitute parts are grouped into two categories: direct equivalents (matching all primary criteria with active product status) and functional alternatives (meeting electrical requirements with minor parameter variations or enhanced specifications).

Parameter Comparison

Part Number	Manufacturer	Product Status	Vce(BR) Max (V)	Ic Max (mA)	Vce Sat @ Ib, Ic (mV)	hFE Min @ Ic, Vce	Power Max (mW)	fT (MHz)	Temp Range (°C)	Package	Grade
BCX19TC	Diodes Inc.	Obsolete	45	500	620 @ 50, 500	100 @ 100, 1	330	200	−55 to +150	SOT-23-3	—
BC817-16-7-F	Diodes Inc.	Active	45	500	700 @ 50, 500	100 @ 100, 1	310	100	−65 to +150	SOT-23-3	Automotive
BC817,215	Nexperia USA	Active	45	500	700 @ 50, 500	100 @ 100, 1	250	100	−55 to +150	TO-236AB	Automotive
BC817-16,235	Nexperia USA	Active	45	500	700 @ 50, 500	100 @ 100, 1	250	100	−55 to +150	TO-236AB	Automotive
BC817-16LT1G	onsemi	Active	45	500	700 @ 50, 500	100 @ 100, 1	300	100	−65 to +150	SOT-23-3	—
BCX19,215	Nexperia USA	Active	45	500	620 @ 50, 500	100 @ 100, 1	250	100	−55 to +150	TO-236AB	Automotive
BCX19LT1G	onsemi	Active	45	500	620 @ 50, 500	100 @ 100, 1	300	—	−55 to +150	SOT-23-3	—
SBC817-16LT3G	onsemi	Active	45	500	700 @ 50, 500	100 @ 100, 1	300	100	−65 to +150	SOT-23-3	Automotive
SBCX19LT1G	onsemi	Active	45	500	620 @ 50, 500	100 @ 100, 1	300	—	−55 to +150	SOT-23-3	Automotive
2PD602AQL,215	Nexperia USA	Active	50	500	600 @ 30, 300	85 @ 150, 10	250	140	−55 to +150	TO-236AB	Automotive
2PD602ARL,235	Nexperia USA	Active	50	500	600 @ 30, 300	120 @ 150, 10	250	160	−55 to +150	TO-236AB	Automotive

Engineering Selection Recommendations

Direct Equivalents (Preferred for BCX19TC Replacement):

BC817-16LT1G (onsemi) and BCX19LT1G (onsemi) are the primary recommended substitutes. Both devices maintain the 45 V collector-emitter breakdown voltage, 500 mA collector current rating, and SOT-23-3 package configuration. BC817-16LT1G offers active product status with automotive qualification (AEC-Q101), extended temperature range (−65 to +150°C), and 300 mW power dissipation. BCX19LT1G provides identical base product lineage with matching Vce saturation characteristics (620 mV) and active status.

Secondary Equivalents (Functional Compatibility):

BC817-16-7-F (Diodes Incorporated) maintains manufacturer continuity with active status and automotive grade qualification. BC817,215 and BC817-16,235 (Nexperia USA) provide automotive-qualified alternatives with active product status, though power dissipation is reduced to 250 mW. BCX19,215 (Nexperia USA) preserves the BCX19 base product line with automotive qualification and matching saturation voltage.

Enhanced Specification Alternatives:

SBC817-16LT3G (onsemi) and SBCX19LT1G (onsemi) are automotive-qualified variants with extended temperature range and active status. These devices are suitable where automotive-grade reliability is required.

Functional Alternatives (Parameter Deviations):

2PD602AQL,215 and 2PD602ARL,235 (Nexperia USA) feature elevated collector-emitter breakdown voltage (50 V) and automotive qualification. These parts are suitable only where the higher voltage rating does not create design conflicts and where the different hFE characteristics (85–120 minimum) are acceptable for the application.

Selection Basis:

Product Status: Active status is mandatory for new designs; obsolete BCX19TC requires substitution.
Compliance: All recommended substitutes maintain ROHS3 compliance and MSL 1 rating.
Automotive Applications: Devices with AEC-Q101 qualification are required for automotive-grade designs.
Package Compatibility: SOT-23-3 package variants are electrically and mechanically interchangeable; TO-236AB variants require PCB footprint verification.

Frequently Asked Questions (FAQ)

Q1: Can BC817-16LT1G directly replace BCX19TC without PCB modification?

BC817-16LT1G is electrically equivalent to BCX19TC across all critical parameters (45 V Vce(BR), 500 mA Ic, 100 hFE minimum, SOT-23-3 package). Both devices use identical SOT-23-3 pinout and footprint. Direct substitution on existing PCBs is possible without layout changes. Verify that the 100 MHz transition frequency (versus 200 MHz for BCX19TC) does not impact circuit performance in high-frequency applications.

Q2: What is the difference between BC817 and BCX19 base product lines?

BC817 and BCX19 are distinct base product families from different manufacturers with identical electrical ratings (45 V, 500 mA, 100 hFE minimum). The primary distinction is manufacturing source and historical product lineage. BCX19 variants are sourced from Nexperia and onsemi; BC817 variants are sourced from Diodes Incorporated, Nexperia, and onsemi. Both families are fully interchangeable based on electrical specifications.

Q3: Why do some substitutes show lower power dissipation (250 mW vs. 330 mW)?

Power dissipation ratings reflect maximum thermal capability under specified conditions. Nexperia TO-236AB package variants (BC817,215, BC817-16,235, BCX19,215, 2PD602 series) are rated at 250 mW, while onsemi SOT-23-3 variants (BC817-16LT1G, BCX19LT1G, SBC817-16LT3G, SBCX19LT1G) are rated at 300 mW. These differences reflect package thermal characteristics and manufacturing process variations, not functional capability. For applications operating below 250 mW, all substitutes are suitable.

Q4: Are automotive-qualified parts (AEC-Q101) required for non-automotive applications?

Automotive qualification is not mandatory for non-automotive designs. However, AEC-Q101 certified parts (BC817-16-7-F, BC817,215, BC817-16,235, BCX19,215, SBC817-16LT3G, SBCX19LT1G, 2PD602 series) undergo enhanced reliability testing and are suitable for any application requiring higher quality assurance. Non-automotive applications may use non-qualified variants (BC817-16LT1G, BCX19LT1G) without functional impact.

Q5: What is the significance of the temperature range difference (−55 to +150°C vs. −65 to +150°C)?

Operating temperature range defines the guaranteed functional limits. BCX19TC and most Nexperia variants operate from −55°C; Diodes Incorporated BC817-16-7-F and onsemi SBC817-16LT3G extend to −65°C. For applications operating below −55°C, only the extended-range variants are suitable. For standard industrial applications (−40 to +85°C), all substitutes are equivalent.

Q6: Can 2PD602 series parts substitute for BCX19TC despite different hFE specifications?

2PD602AQL,215 and 2PD602ARL,235 feature hFE minimum of 85–120 at different test conditions (150 mA, 10 V) compared to BCX19TC specification (100 hFE at 100 mA, 1 V). These parts are not direct equivalents and substitution requires circuit analysis to confirm hFE tolerance compatibility. Use only where design margins accommodate the different gain characteristics.

Q7: What packaging considerations apply when selecting between SOT-23-3 and TO-236AB variants?

SOT-23-3 and TO-236AB are physically identical packages with identical pinout and electrical performance. The designation difference reflects manufacturer nomenclature (onsemi uses SOT-23-3; Nexperia uses TO-236AB). PCB footprints are mechanically compatible. Selection may be based on supplier availability or preferred manufacturer relationship without functional impact.

Q8: Is transition frequency (fT) a critical parameter for BCX19TC substitution?

Transition frequency indicates high-frequency performance capability. BCX19TC specifies 200 MHz; most BC817 variants specify 100 MHz; 2PD602 variants specify 140–160 MHz. For applications operating below 50 MHz, transition frequency differences are not functionally significant. For circuits operating near or above 100 MHz, verify that reduced fT does not degrade performance through circuit simulation or prototype testing.

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