BCX19,235 Equivalent & Substitute Parts

Part Overview

The BCX19,235 is an NPN bipolar junction transistor manufactured by Nexperia USA Inc., designed for general-purpose switching and amplification applications. This surface mount device operates at 45 V collector-emitter breakdown voltage with a maximum collector current of 500 mA and 250 mW power dissipation. The part is actively produced, AEC-Q101 qualified for automotive applications, and ROHS3 compliant. Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and packaging format requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector Current (Max)	500	mA
Collector-Emitter Breakdown Voltage (Max)	45	V
Vce Saturation (Max) @ 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)	250	mW
Transition Frequency	100	MHz
Operating Temperature (Max)	150	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BCX19,235 is determined by electrical and mechanical parameter equivalence within the NPN bipolar transistor category. The critical parameters governing substitution are:

Electrical Parameters:

Collector current rating: 500 mA maximum
Collector-emitter breakdown voltage: 45 V maximum
DC current gain (hFE): minimum 100 at specified bias conditions
Transition frequency: 100 MHz minimum
Power dissipation: 250 mW or greater

Mechanical Parameters:

Package type: TO-236-3 / SOT-23-3 surface mount
Mounting: Surface mount technology
Pin configuration: 3-pin

Compliance Parameters:

RoHS3 compliance required
Automotive grade preferred (AEC-Q101 or AEC-Q100)
Moisture sensitivity level: 1 (Unlimited)

Substitute parts are grouped into two categories: Direct Manufacturer Substitutes (same base part number with different packaging or qualification variants) and Parametric Equivalents (different manufacturers or part numbers meeting identical electrical specifications).

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Vce Sat mV	hFE (Min)	Power mW	Freq MHz	Package	Packaging Format	AEC Qualification	Inventory Pcs
BCX19,235	Nexperia USA Inc.	500	45	620 @ 50mA, 500mA	100 @ 100mA, 1V	250	100	TO-236-3	Tape & Reel (TR)	AEC-Q101	8,577
BC817-16,215	Nexperia USA Inc.	500	45	700 @ 50mA, 500mA	100 @ 100mA, 1V	250	100	TO-236-3	Cut Tape (CT) & Digi-Reel®	AEC-Q101	9,200
BC817,215	Nexperia USA Inc.	500	45	700 @ 50mA, 500mA	100 @ 100mA, 1V	250	100	TO-236-3	Cut Tape (CT) & Digi-Reel®	AEC-Q101	32,200
BC817,235	Nexperia USA Inc.	500	45	700 @ 50mA, 500mA	100 @ 100mA, 1V	250	100	TO-236-3	Tape & Reel (TR)	AEC-Q101	56,447
BC817-16,235	Nexperia USA Inc.	500	45	700 @ 50mA, 500mA	100 @ 100mA, 1V	250	100	TO-236-3	Tape & Reel (TR)	AEC-Q101	48,307
BC817-16-QR	Nexperia USA Inc.	500	45	700 @ 50mA, 500mA	100 @ 100mA, 1V	250	100	TO-236-3	Tape & Reel (TR)	AEC-Q101	33,999
BC817-QR	Nexperia USA Inc.	500	45	700 @ 50mA, 500mA	100 @ 100mA, 1V	250	100	TO-236-3	Tape & Reel (TR)	AEC-Q101	1,115
BC817K-16R	Nexperia USA Inc.	500	45	700 @ 50mA, 500mA	100 @ 100mA, 1V	250	100	TO-236-3	Tape & Reel (TR)	AEC-Q100	3,541
BCX19,215	Nexperia USA Inc.	500	45	620 @ 50mA, 500mA	100 @ 100mA, 1V	250	100	TO-236-3	Cut Tape (CT) & Digi-Reel®	AEC-Q101	15,200
BC817-16LT1G	onsemi	500	45	700 @ 50mA, 500mA	100 @ 100mA, 1V	300	100	TO-236-3	Cut Tape (CT) & Digi-Reel®	—	305,400
BCX19LT1G	onsemi	500	45	620 @ 50mA, 500mA	100 @ 100mA, 1V	300	—	TO-236-3	Cut Tape (CT) & Digi-Reel®	—	110,100

Engineering Selection Recommendations

Nexperia USA Inc. Direct Substitutes (Preferred for Automotive Applications):

The BC817 series parts (BC817,215; BC817,235; BC817-16,215; BC817-16,235; BC817-16-QR; BC817-QR; BC817K-16R) and BCX19,215 are direct electrical equivalents manufactured by Nexperia USA Inc. All maintain AEC-Q101 automotive qualification except BC817K-16R, which carries AEC-Q100 qualification. These parts differ primarily in packaging format (Tape & Reel versus Cut Tape & Digi-Reel) and hFE binning. Selection between these variants depends on procurement format requirements and inventory availability.

Vce Saturation Consideration:

The BCX19,235 and BCX19,215 exhibit lower Vce saturation (620 mV) compared to BC817 variants (700 mV). This 80 mV difference is within typical design margins for general-purpose switching applications but should be evaluated in saturation-critical circuits.

onsemi Alternatives (Extended Power Rating):

BC817-16LT1G and BCX19LT1G, manufactured by onsemi, provide 300 mW power dissipation versus 250 mW for Nexperia parts. These parts meet identical electrical specifications and are housed in the same TO-236-3 package. onsemi parts lack automotive qualification designations but maintain ROHS3 compliance and MSL-1 moisture sensitivity rating. These alternatives are suitable for non-automotive applications or where extended thermal margin is beneficial.

Packaging Format Selection:

Tape & Reel (TR) format is standard for high-volume automated assembly. Cut Tape (CT) & Digi-Reel® format accommodates lower-volume or mixed-component pick-and-place operations. Electrical performance is identical across packaging formats.

Frequently Asked Questions (FAQ)

Q: Can BC817-16,235 directly replace BCX19,235 in an existing design?

A: Yes. Both parts are NPN transistors with identical collector current (500 mA), breakdown voltage (45 V), DC current gain (100 minimum), transition frequency (100 MHz), and power rating (250 mW). Both are housed in TO-236-3 packages and carry AEC-Q101 automotive qualification. The primary difference is Vce saturation: BC817-16,235 saturates at 700 mV versus BCX19,235 at 620 mV. This difference is acceptable in most switching applications.

Q: What is the difference between BC817,235 and BC817-16,235?

A: Both parts are electrically identical NPN transistors with the same electrical specifications. The designation difference reflects internal hFE binning or manufacturing lot tracking. Both are supplied in Tape & Reel format and carry AEC-Q101 qualification. Selection between them is based on inventory availability and procurement requirements.

Q: Are onsemi BC817-16LT1G and BCX19LT1G suitable replacements for automotive applications?

A: onsemi parts meet all electrical specifications of the Nexperia equivalents and maintain ROHS3 compliance. However, they lack automotive qualification designations (AEC-Q101 or AEC-Q100). Use of onsemi parts in automotive designs requires design review and qualification assessment per applicable automotive standards.

Q: Why does BCX19,235 have lower Vce saturation (620 mV) than BC817 variants (700 mV)?

A: Vce saturation variation reflects different internal transistor design or manufacturing process optimization. Both values are within normal operating ranges for NPN transistors in this class. The 80 mV difference is negligible in most applications but should be evaluated in circuits where saturation voltage directly affects performance.

Q: Can I substitute Cut Tape (CT) & Digi-Reel® packaged parts for Tape & Reel (TR) format?

A: Electrical performance is identical. Substitution depends on assembly equipment compatibility. Tape & Reel format is standard for high-speed automated pick-and-place systems. Cut Tape & Digi-Reel® format is used for lower-volume or mixed-component assembly. Verify your assembly equipment specifications before substituting packaging formats.

Q: What is the significance of the "-QR" suffix in BC817-16-QR and BC817-QR?

A: The "-QR" suffix indicates qualification under the BC817-Q series designation. These parts maintain identical electrical specifications and AEC-Q101 automotive qualification as standard BC817 variants. The suffix reflects internal qualification tracking or manufacturing process designation.

Q: Is BC817K-16R equivalent to other BC817 variants?

A: BC817K-16R is electrically equivalent to all BC817 variants listed. It carries AEC-Q100 automotive qualification (versus AEC-Q101 for other variants). Both AEC-Q100 and AEC-Q101 are valid automotive qualifications; selection depends on specific design requirements and qualification documentation.

Q: Can onsemi BCX19LT1G replace Nexperia BCX19,235?

A: Yes, electrically. Both are NPN transistors with 500 mA collector current, 45 V breakdown voltage, and identical DC current gain. onsemi BCX19LT1G provides 300 mW power dissipation versus 250 mW for Nexperia BCX19,235. The onsemi part lacks automotive qualification and transition frequency specification. Substitution is suitable for non-automotive applications or where extended thermal margin is required.

Q: What inventory levels should I consider when selecting between substitute parts?

A: Inventory availability is provided for supply chain planning. BC817,235 (56,447 pcs) and BC817-16,235 (48,307 pcs) offer the highest availability among Nexperia Tape & Reel options. onsemi BC817-16LT1G (305,400 pcs) provides maximum availability across all listed alternatives. Lower-inventory parts (BC817-QR: 1,115 pcs; BC817K-16R: 3,541 pcs) may require longer lead times.

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