BCX17 Equivalent & Substitute Parts

Part Overview

The BCX17 is a PNP bipolar junction transistor manufactured by onsemi, designed for surface mount applications in the SOT-23-3 package. This device operates at a maximum collector current of 500 mA with a collector-emitter breakdown voltage of 45 V and maximum power dissipation of 300 mW. The BCX17 is classified as an obsolete product, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Active alternatives maintain electrical compatibility while offering current manufacturing availability and compliance certifications.

Key Parameters

Parameter	BCX17 Specification
Transistor Type	PNP
Current - Collector (Ic) Max	500 mA
Voltage - Collector Emitter Breakdown (Max)	45 V
Vce Saturation (Max) @ Ib, Ic	620 mV @ 50 mA, 500 mA
Current - Collector Cutoff (Max)	100 nA (ICBO)
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 100 mA, 1 V
Power - Max	300 mW
Operating Temperature	-55°C to 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the BCX17 are classified into two categories based on electrical parameter alignment and product status:

Direct Substitutes maintain identical or equivalent electrical specifications within the allowed parameter ranges for the BCX17. These parts satisfy the core functional requirements: PNP transistor type, 500 mA maximum collector current, 45 V collector-emitter breakdown voltage, 300 mW maximum power dissipation, SOT-23-3 package, and -55°C to 150°C operating temperature range. Direct substitutes include BCX17LT1G (active product status), BC807-16LT1G, BC807-16LT3G, SBC807-16LT1G, and SBC807-16LT3G.

Similar Substitutes share the same transistor type, package, and primary electrical ratings but may differ in secondary parameters such as transition frequency, DC current gain specifications, or power dissipation. These parts include BC807-25LT1G, BC807-25LT3G, SBC807-40LT1G, and 50A02CH-TL-E. The BC857ALT1G is classified as a similar substitute due to reduced maximum collector current (100 mA versus 500 mA).

Substitution eligibility is determined by the following key parameters:

Transistor Type: PNP
Maximum Collector Current: 500 mA (or higher)
Collector-Emitter Breakdown Voltage: 45 V (or higher)
Maximum Power Dissipation: 300 mW (or higher)
Package: SOT-23-3
Operating Temperature Range: -55°C to 150°C minimum

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max)	Vce Breakdown (Max)	Vce Sat (Max)	hFE (Min)	Power (Max)	Frequency	Package	RoHS Status
BCX17	onsemi	Obsolete	500 mA	45 V	620 mV	100	300 mW	—	SOT-23-3	—
BCX17LT1G	onsemi	Active	500 mA	45 V	620 mV	100	300 mW	—	SOT-23-3	ROHS3 Compliant
BC807-16LT1G	onsemi	Active	500 mA	45 V	700 mV	100	300 mW	100 MHz	SOT-23-3	ROHS3 Compliant
BC807-16LT3G	onsemi	Active	500 mA	45 V	700 mV	100	300 mW	100 MHz	SOT-23-3	ROHS3 Compliant
BC807-25LT1G	onsemi	Active	500 mA	45 V	700 mV	160	300 mW	100 MHz	SOT-23-3	ROHS3 Compliant
BC807-25LT3G	onsemi	Active	500 mA	45 V	700 mV	160	300 mW	100 MHz	SOT-23-3	ROHS3 Compliant
SBC807-16LT1G	onsemi	Active	500 mA	45 V	700 mV	100	300 mW	100 MHz	SOT-23-3	ROHS3 Compliant
SBC807-16LT3G	onsemi	Active	500 mA	45 V	700 mV	100	300 mW	100 MHz	SOT-23-3	ROHS3 Compliant
SBC807-40LT1G	onsemi	Active	500 mA	45 V	700 mV	250	300 mW	100 MHz	SOT-23-3	ROHS3 Compliant
BC857ALT1G	onsemi	Active	100 mA	45 V	650 mV	125	300 mW	100 MHz	SOT-23-3	ROHS3 Compliant
50A02CH-TL-E	onsemi	Active	500 mA	50 V	120 mV	200	700 mW	690 MHz	SOT-23-3	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: BCX17LT1G

The BCX17LT1G is the direct active equivalent of the obsolete BCX17. This part maintains identical electrical specifications including 500 mA maximum collector current, 45 V collector-emitter breakdown voltage, 620 mV saturation voltage, and 100 minimum DC current gain. The BCX17LT1G carries active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). This part provides the most direct replacement path with no design modifications required.

Secondary Recommendations: BC807-16LT1G and BC807-16LT3G

The BC807-16LT1G and BC807-16LT3G are active onsemi products that meet all core electrical requirements. These parts differ from the BCX17 in saturation voltage (700 mV versus 620 mV) and include 100 MHz transition frequency specification. Both variants are ROHS3 compliant with active product status. The BC807-16LT1G is supplied in Cut Tape (CT) & Digi-Reel® packaging, while BC807-16LT3G is supplied in Tape & Reel (TR) format.

Automotive-Grade Options: SBC807-16LT1G, SBC807-16LT3G, and SBC807-40LT1G

The SBC807 series variants are automotive-grade PNP transistors qualified to AEC-Q101 standard. These parts maintain 500 mA collector current and 45 V breakdown voltage specifications. The SBC807-16LT1G and SBC807-16LT3G feature 100 minimum DC current gain, while SBC807-40LT1G provides 250 minimum DC current gain. All SBC807 variants include 100 MHz transition frequency and ROHS3 compliance. Selection of automotive-grade variants is appropriate for applications requiring AEC-Q101 qualification.

Alternative with Enhanced Performance: 50A02CH-TL-E

The 50A02CH-TL-E offers enhanced electrical performance with 50 V collector-emitter breakdown voltage (versus 45 V), 700 mW maximum power dissipation (versus 300 mW), and 690 MHz transition frequency. This part is suitable for applications requiring higher voltage margin or higher frequency operation. The 50A02CH-TL-E uses a 3-CPH package variant within the SOT-23-3 family.

Not Recommended for Direct Substitution: BC857ALT1G

The BC857ALT1G is not suitable as a direct substitute due to reduced maximum collector current specification of 100 mA, compared to the BCX17 requirement of 500 mA. This part is appropriate only for applications with collector current requirements not exceeding 100 mA.

Frequently Asked Questions (FAQ)

Q: Can BCX17LT1G be used as a direct replacement for BCX17 without circuit modifications?

A: Yes. The BCX17LT1G maintains identical electrical specifications to the BCX17, including collector current, breakdown voltage, saturation voltage, and DC current gain. No circuit modifications are required. The primary difference is product status: BCX17LT1G is active with ROHS3 compliance, while BCX17 is obsolete.

Q: What is the difference between BC807-16LT1G and BC807-16LT3G?

A: Both parts are electrically identical. The primary difference is packaging format: BC807-16LT1G is supplied in Cut Tape (CT) & Digi-Reel® format, while BC807-16LT3G is supplied in Tape & Reel (TR) format. Selection depends on assembly equipment compatibility and procurement requirements.

Q: Why do some substitute parts have higher saturation voltage (700 mV) compared to BCX17 (620 mV)?

A: Saturation voltage variation within the specified range reflects manufacturing process differences between device families. The BC807 series specifies 700 mV maximum saturation voltage, which remains within acceptable operating margins for most applications. Circuit designs should accommodate the specified maximum saturation voltage range.

Q: When should automotive-grade SBC807 variants be selected instead of standard BC807 variants?

A: Automotive-grade SBC807 variants carry AEC-Q101 qualification and are appropriate for applications requiring automotive reliability standards. Selection depends on end-application requirements. Standard BC807 variants are suitable for general-purpose industrial and consumer applications.

Q: Is BC857ALT1G compatible with BCX17 designs?

A: BC857ALT1G is not compatible with BCX17 designs requiring 500 mA collector current. The BC857ALT1G maximum collector current is 100 mA. This part is suitable only for applications with collector current requirements not exceeding 100 mA.

Q: What packaging considerations apply when selecting between substitute parts?

A: All substitute parts use SOT-23-3 package (also designated TO-236-3 or SC-59). Physical package dimensions are identical. Packaging format differences (Cut Tape, Digi-Reel, or Tape & Reel) affect procurement and assembly processes but not electrical performance or PCB layout.

Q: Does the 100 MHz transition frequency specification in BC807 variants affect compatibility with BCX17 designs?

A: The BCX17 does not specify transition frequency. BC807 variants include 100 MHz transition frequency specification, indicating higher frequency capability. This specification does not create incompatibility; it indicates enhanced performance margin for high-frequency applications. Designs operating below 100 MHz are unaffected.

Q: Can 50A02CH-TL-E be used in all BCX17 applications?

A: The 50A02CH-TL-E meets core electrical requirements (500 mA collector current, 45 V minimum breakdown voltage, SOT-23-3 package). However, the 50 V breakdown voltage and 700 mW power dissipation represent enhanced specifications. This part is suitable for applications where higher voltage margin or power dissipation capability is beneficial or required. The 3-CPH package variant should be confirmed compatible with PCB layout and assembly equipment.

Q: What is the significance of ROHS3 compliance on substitute parts?

A: ROHS3 compliance indicates conformance to Restriction of Hazardous Substances Directive requirements. All active substitute parts listed carry ROHS3 compliance, meeting current regulatory requirements for electronic component manufacturing and use in regulated markets.

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