BCX70K-TP Equivalent & Substitute Parts

Part Overview

The BCX70K-TP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose interface applications. This surface mount device operates at 45 V collector-emitter breakdown voltage with a maximum collector current of 200 mA and transition frequency of 250 MHz. The part is classified as Active product status with full REACH compliance.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges. Alternative devices may be required due to inventory availability, packaging format preferences, or specific application constraints while maintaining functional equivalence.

Key Parameters

Parameter	BCX70K-TP Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	200	mA
Voltage - Collector Emitter Breakdown (Max)	45	V
Power - Max	250	mW
Frequency - Transition	250	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Vce Saturation (Max)	550 mV @ 1.25 mA, 50 mA	—
DC Current Gain (hFE) Min	380 @ 2 mA, 5 V	—

Substitute Part Grouping Explanation

Substitute parts for the BCX70K-TP are qualified based on the following critical parameters:

Primary Substitution Criteria:

Transistor Type: NPN configuration required
Current - Collector (Ic) Max: Minimum 200 mA to match or exceed primary device capability
Voltage - Collector Emitter Breakdown: Minimum 45 V to maintain voltage rating compatibility
Power Dissipation: Minimum 225 mW to support thermal requirements
Mounting Type: Surface Mount configuration
Package / Case: TO-236-3, SC-59, or SOT-23-3 mechanical compatibility

Substitution Logic: Parts are grouped into two categories based on electrical performance alignment:

Category A - Full Parameter Match: Parts meeting or exceeding all primary specifications including collector current (200 mA), voltage rating (45 V minimum), and power dissipation (225 mW minimum). These devices provide direct functional equivalence.

Category B - Reduced Performance Parameters: Parts with collector current ratings below 200 mA (150 mA) or voltage ratings at 50 V. These devices operate within compatible ranges but with reduced maximum ratings. Substitution is valid when application requirements do not demand the full 200 mA collector current specification.

All substitute parts maintain NPN configuration, surface mount technology, and compatible package formats. Operating temperature ranges and compliance certifications are verified for each substitute.

Parameter Comparison

Parameter	BCX70K-TP	MMBT6429LT1G	MMBT6428LT1G	TBC847B,LM	2SC2712-BL,LF	2SC2712-GR,LF	2SC2712-OTE85LF
Manufacturer	Micro Commercial Co	onsemi	onsemi	Toshiba	Toshiba	Toshiba	Toshiba
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN	NPN
Ic (Max) [mA]	200	200	200	150	150	150	150
Vce Breakdown (Max) [V]	45	45	50	50	50	50	50
Power - Max [mW]	250	225	225	320	150	150	150
Frequency - Transition [MHz]	250	700	700	100	80	80	80
Operating Temperature (Max) [°C]	150	150	150	150	125	125	125
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	Not specified	REACH Unaffected	Not specified
Product Status	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes (Full Electrical Equivalence):

MMBT6429LT1G and MMBT6428LT1G from onsemi provide the closest electrical match to the BCX70K-TP. Both devices maintain 200 mA collector current rating and are available in compatible SOT-23-3 packaging. MMBT6429LT1G matches the 45 V voltage rating exactly, while MMBT6428LT1G provides 50 V rating. Both devices feature superior transition frequency (700 MHz) and are ROHS3 compliant with REACH Unaffected status. Operating temperature range extends to 150°C, matching the primary device specification.

Secondary Substitutes (Reduced Current Rating):

TBC847B,LM, 2SC2712-BL,LF, 2SC2712-GR,LF, and 2SC2712-OTE85LF are qualified substitutes when application requirements permit operation below 200 mA collector current. These devices are rated at 150 mA maximum collector current and 50 V voltage rating. All maintain surface mount SOT-23-3 packaging compatibility. TBC847B,LM provides 320 mW power dissipation and 100 MHz transition frequency. Toshiba 2SC2712 variants offer 150 mW power dissipation and 80 MHz transition frequency with ROHS3 compliance.

Compliance Considerations:

All substitute parts maintain Active product status. MMBT6429LT1G and MMBT6428LT1G provide explicit REACH Unaffected certification matching the primary device. TBC847B,LM provides REACH Unaffected status. Toshiba 2SC2712-GR,LF explicitly states REACH Unaffected compliance. All identified substitutes are ROHS3 compliant, supporting environmental regulatory requirements.

Packaging and Inventory:

Substitute parts are available in multiple packaging formats. MMBT6429LT1G offers highest inventory availability (155,200 pcs). 2SC2712-OTE85LF provides substantial stock (24,385 pcs) in Tape & Reel format. TBC847B,LM maintains 115,957 pcs inventory. Selection between packaging formats (Tape & Reel, Cut Tape, or Digi-Reel) depends on assembly process requirements.

Frequently Asked Questions (FAQ)

Q: Can MMBT6429LT1G directly replace BCX70K-TP in all applications?

A: MMBT6429LT1G is a direct electrical substitute for BCX70K-TP. Both devices share identical 45 V voltage rating, 200 mA collector current rating, and -55°C to 150°C operating temperature range. Both are packaged in compatible TO-236-3/SOT-23-3 format. MMBT6429LT1G features superior transition frequency (700 MHz vs. 250 MHz), which does not create compatibility issues in applications designed for the primary device.

Q: What is the difference between MMBT6428LT1G and MMBT6429LT1G?

A: Both onsemi devices maintain 200 mA collector current and 700 MHz transition frequency in SOT-23-3 packaging. The primary difference is voltage rating: MMBT6429LT1G is rated at 45 V (matching BCX70K-TP), while MMBT6428LT1G is rated at 50 V. For applications requiring exactly 45 V rating, MMBT6429LT1G is the preferred selection. MMBT6428LT1G provides additional voltage margin in designs tolerating higher ratings.

Q: Can 2SC2712 variants substitute for BCX70K-TP?

A: 2SC2712 variants (2SC2712-BL,LF, 2SC2712-GR,LF, 2SC2712-OTE85LF) are qualified substitutes when application collector current requirements do not exceed 150 mA. These Toshiba devices provide 50 V voltage rating and maintain compatible SOT-23-3 packaging. The 150 mA current rating represents the primary limitation. Applications requiring full 200 mA capability must use MMBT6429LT1G or MMBT6428LT1G.

Q: What is the difference between 2SC2712-BL,LF and 2SC2712-GR,LF?

A: Both parts are identical Toshiba 2SC2712 transistors with 150 mA collector current and 50 V voltage rating. The difference is packaging format: 2SC2712-BL,LF is supplied in Tape & Reel (TR) format, while 2SC2712-GR,LF is supplied in Cut Tape (CT) & Digi-Reel format. Electrical specifications and performance are equivalent. Selection depends on assembly equipment compatibility and procurement preferences.

Q: Is TBC847B,LM suitable for BCX70K-TP replacement?

A: TBC847B,LM is a qualified substitute when application requirements permit 150 mA maximum collector current operation. This Toshiba device provides 50 V voltage rating and 320 mW power dissipation in compatible SOT-23-3 packaging. Transition frequency is 100 MHz, lower than the primary device but suitable for general-purpose interface applications. The 150 mA current limitation is the primary constraint for substitution.

Q: Are all substitute parts ROHS3 compliant?

A: All identified substitute parts are explicitly ROHS3 compliant. MMBT6429LT1G, MMBT6428LT1G, TBC847B,LM, 2SC2712-BL,LF, 2SC2712-GR,LF, and 2SC2712-OTE85LF all carry ROHS3 Compliant certification, supporting environmental regulatory requirements for electronic component manufacturing and assembly.

Q: What is the operating temperature difference between BCX70K-TP and substitute parts?

A: BCX70K-TP and onsemi substitutes (MMBT6429LT1G, MMBT6428LT1G) both operate across -55°C to 150°C temperature range. Toshiba substitutes (TBC847B,LM and 2SC2712 variants) are rated to 125°C maximum junction temperature. For applications requiring full -55°C to 150°C operation, onsemi devices are required. Toshiba devices are suitable for applications with maximum operating temperature of 125°C.

Q: How do transition frequency differences affect substitution?

A: BCX70K-TP operates at 250 MHz transition frequency. MMBT6429LT1G and MMBT6428LT1G provide 700 MHz, representing superior high-frequency performance. TBC847B,LM provides 100 MHz, and 2SC2712 variants provide 80 MHz. Higher transition frequency does not create compatibility issues in applications designed for lower frequencies. Applications requiring minimum 250 MHz performance should use MMBT6429LT1G or MMBT6428LT1G. Lower-frequency substitutes are suitable for general-purpose interface applications not requiring high-frequency response.

Q: What packaging formats are available for substitute parts?

A: Substitute parts are available in multiple packaging formats. MMBT6429LT1G and MMBT6428LT1G are supplied in Tape & Reel (TR) format. TBC847B,LM is supplied in Cut Tape (CT) & Digi-Reel format. 2SC2712-BL,LF is supplied in Tape & Reel format. 2SC2712-GR,LF is supplied in Cut Tape & Digi-Reel format. 2SC2712-OTE85LF is supplied in Tape & Reel format. Selection depends on assembly process requirements and equipment compatibility.

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