BCX70H-TP Equivalent & Substitute Parts

Part Overview

The BCX70H-TP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. This device operates at 45 V collector-emitter breakdown voltage with a maximum collector current of 200 mA and transition frequency of 250 MHz. The BCX70H-TP is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. Substitute parts must maintain electrical compatibility within the specified parameter ranges while accommodating packaging and availability constraints.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector Current (Max)	200	mA
Collector-Emitter Breakdown Voltage (Max)	45	V
Vce Saturation (Max)	550	mV @ 1.25mA, 50mA
Collector Cutoff Current (Max)	20	nA
DC Current Gain (hFE Min)	180	@ 2mA, 5V
Power Dissipation (Max)	250	mW
Transition Frequency	250	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package	SOT-23-3 (TO-236-3, SC-59)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BCX70H-TP is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Collector-Emitter Breakdown Voltage: Substitute parts must equal or exceed 45 V
Collector Current (Max): Substitute parts must support minimum 200 mA
Transition Frequency: Substitute parts must support minimum 250 MHz for high-speed applications
DC Current Gain (hFE): Substitute parts must meet or exceed 180 @ specified test conditions
Power Dissipation: Substitute parts must support minimum 250 mW
Vce Saturation: Substitute parts must maintain saturation characteristics within acceptable limits

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount required
Package: SOT-23-3 (TO-236-3, SC-59) or compatible variants
Moisture Sensitivity Level: MSL 1 (Unlimited) preferred

Substitution Categories:

Direct Equivalent (Same Electrical Specifications): BCX70J-TP maintains identical electrical parameters with active product status and improved DC current gain (250 @ 2mA, 5V).

Functional Equivalents (Meets or Exceeds Specifications): MMBT6428LT1G and NSVMMBT6429LT1G provide enhanced transition frequency (700 MHz) and higher power dissipation ratings, supporting the BCX70H-TP application envelope with superior performance margins.

Reduced-Performance Substitutes (Partial Parameter Reduction): 2SC2412KT146R, 2SC2712 variants, and NXP3875YR operate at reduced collector current (150 mA) or transition frequency (80–180 MHz) but maintain voltage and power ratings sufficient for lower-speed applications.

Upgraded Alternatives (Enhanced Specifications): 2PD601BRL,215 provides automotive-grade qualification (AEC-Q101) with improved Vce saturation characteristics and higher collector-emitter breakdown voltage (50 V).

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	hFE (Min)	Vce Sat (Max) mV	fT MHz	P (Max) mW	Temp Range °C	Package	Status
BCX70H-TP	Micro Commercial Co	200	45	180 @ 2mA, 5V	550 @ 1.25mA, 50mA	250	250	-55 to 150	SOT-23-3	Obsolete
BCX70J-TP	Micro Commercial Co	200	45	250 @ 2mA, 5V	550 @ 1.25mA, 50mA	250	250	-55 to 150	SOT-23-3	Active
MMBT6428LT1G	onsemi	200	50	250 @ 100µA, 5V	600 @ 5mA, 100mA	700	225	-55 to 150	SOT-23-3	Active
NSVMMBT6429LT1G	onsemi	200	45	500 @ 100µA, 5V	600 @ 5mA, 100mA	700	300	-55 to 150	SOT-23-3	Active
2PD601BRL,215	Nexperia USA Inc.	200	50	210 @ 2mA, 10V	250 @ 10mA, 100mA	250	250	-55 to 150	TO-236AB	Active
2SC2412KT146R	Rohm Semiconductor	150	50	180 @ 1mA, 6V	400 @ 5mA, 50mA	180	200	-55 to 150	SMT3	Active
2SC2712-BL,LF	Toshiba Semiconductor and Storage	150	50	70 @ 2mA, 6V	250 @ 10mA, 100mA	80	150	-55 to 125	S-Mini	Active
2SC2712-GR,LF	Toshiba Semiconductor and Storage	150	50	70 @ 2mA, 6V	250 @ 10mA, 100mA	80	150	-55 to 125	S-Mini	Active
2SC2712-OTE85LF	Toshiba Semiconductor and Storage	150	50	70 @ 2mA, 6V	250 @ 10mA, 100mA	80	150	-55 to 125	TO-236	Active
2SC2712-Y,LF	Toshiba Semiconductor and Storage	150	50	120 @ 2mA, 6V	250 @ 10mA, 100mA	80	150	-55 to 125	S-Mini	Active
NXP3875YR	Nexperia USA Inc.	150	50	120 @ 2mA, 6V	250 @ 10mA, 100mA	80	200	-55 to 150	TO-236AB	Active

Engineering Selection Recommendations

Primary Recommendation: BCX70J-TP

BCX70J-TP is the direct active equivalent of BCX70H-TP, manufactured by the same supplier (Micro Commercial Co) with identical electrical specifications and enhanced DC current gain (250 @ 2mA, 5V versus 180 @ 2mA, 5V). This part maintains full compatibility with existing designs and carries active product status with unlimited moisture sensitivity level (MSL 1). Packaging is available in Tape & Reel format with 1090 units in stock.

Secondary Recommendation: MMBT6428LT1G

MMBT6428LT1G (onsemi) provides functional equivalence with superior transition frequency (700 MHz versus 250 MHz) and maintains 200 mA collector current and 45 V minimum collector-emitter breakdown voltage. This part is suitable for applications requiring higher-speed performance and operates across the full temperature range (-55°C to 150°C). Power dissipation is rated at 225 mW, slightly below the BCX70H-TP specification but adequate for most applications. ROHS3 compliance and MSL 1 rating are confirmed.

Tertiary Recommendation: NSVMMBT6429LT1G

NSVMMBT6429LT1G (onsemi) matches the BCX70H-TP collector-emitter breakdown voltage (45 V) and collector current (200 mA) with significantly enhanced DC current gain (500 @ 100µA, 5V) and power dissipation (300 mW). Transition frequency is 700 MHz. This part is suitable for designs requiring higher gain and power handling. Full temperature range operation (-55°C to 150°C) is supported.

Automotive-Grade Alternative: 2PD601BRL,215

2PD601BRL,215 (Nexperia USA Inc.) is qualified to AEC-Q101 automotive standard with improved Vce saturation characteristics (250 mV @ 10mA, 100mA versus 550 mV @ 1.25mA, 50mA). Collector-emitter breakdown voltage is increased to 50 V. This part is recommended for automotive applications requiring enhanced reliability and performance margins. Packaging is TO-236AB with active product status.

Reduced-Performance Alternatives:

2SC2412KT146R, 2SC2712 variants, and NXP3875YR operate at reduced collector current (150 mA) or transition frequency (80–180 MHz). These parts are suitable for low-speed switching applications where the full 200 mA current capability and 250 MHz transition frequency of the BCX70H-TP are not required. All variants maintain 50 V collector-emitter breakdown voltage and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can BCX70J-TP directly replace BCX70H-TP in existing designs?

A: Yes. BCX70J-TP is the direct active equivalent with identical electrical specifications, same package (SOT-23-3), and enhanced DC current gain. No circuit modifications are required. The primary difference is product status: BCX70H-TP is obsolete while BCX70J-TP is active.

Q: What is the key difference between BCX70H-TP and MMBT6428LT1G?

A: MMBT6428LT1G provides superior transition frequency (700 MHz versus 250 MHz) and higher collector-emitter breakdown voltage (50 V versus 45 V). Both support 200 mA collector current and operate across -55°C to 150°C. MMBT6428LT1G is suitable for higher-speed applications. Vce saturation is higher (600 mV versus 550 mV), which may affect switching efficiency in some circuits.

Q: Are the 2SC2712 variants suitable replacements for BCX70H-TP?

A: 2SC2712 variants are partial substitutes with reduced collector current (150 mA versus 200 mA) and transition frequency (80 MHz versus 250 MHz). These parts are suitable only for low-speed switching applications where the full performance of BCX70H-TP is not required. Maximum operating temperature is 125°C versus 150°C for BCX70H-TP.

Q: What is the difference between SMT3 and SOT-23-3 packages?

A: Both SMT3 (2SC2412KT146R) and SOT-23-3 (BCX70H-TP, BCX70J-TP) are surface-mount packages with three leads in the TO-236 family. Physical dimensions and pin configurations are compatible, but supplier device package designations differ. Verify PCB footprint compatibility before substitution.

Q: Can NXP3875YR replace BCX70H-TP in automotive applications?

A: NXP3875YR is AEC-Q101 qualified and suitable for automotive applications. However, it operates at reduced collector current (150 mA versus 200 mA) and transition frequency (80 MHz versus 250 MHz). Use this part only in automotive designs where the reduced current and frequency specifications are acceptable.

Q: What is the significance of DC current gain (hFE) differences between substitute parts?

A: DC current gain determines the base current required to achieve a specified collector current. BCX70J-TP (hFE 250) requires less base current than BCX70H-TP (hFE 180) to reach the same collector current. NSVMMBT6429LT1G (hFE 500) requires even less base current. Higher hFE reduces base drive requirements and power dissipation in the base circuit. Verify base circuit design compatibility when substituting parts with significantly different hFE values.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference are ROHS3 compliant. Moisture sensitivity level (MSL 1, Unlimited) is confirmed for all parts, indicating no special moisture handling requirements during storage or assembly.

Q: What is the advantage of NSVMMBT6429LT1G over BCX70J-TP?

A: NSVMMBT6429LT1G provides higher DC current gain (500 @ 100µA, 5V versus 250 @ 2mA, 5V), higher power dissipation rating (300 mW versus 250 mW), and superior transition frequency (700 MHz versus 250 MHz). These characteristics make NSVMMBT6429LT1G suitable for high-speed, high-gain applications. Both parts maintain 45 V collector-emitter breakdown voltage and 200 mA collector current.

Q: Can 2PD601BRL,215 be used in non-automotive applications?

A: Yes. 2PD601BRL,215 is an active part with AEC-Q101 automotive qualification but is not restricted to automotive use. The improved Vce saturation characteristics (250 mV versus 550 mV) and higher collector-emitter breakdown voltage (50 V versus 45 V) provide performance advantages in any application. Verify that the TO-236AB package is compatible with existing PCB designs.

Q: What is the impact of Vce saturation differences on circuit performance?

A: Vce saturation determines the voltage drop across the transistor in saturation mode. BCX70H-TP has 550 mV saturation voltage, while 2PD601BRL,215 has 250 mV. Lower saturation voltage reduces power dissipation and heat generation in switching applications. Higher saturation voltage (MMBT6428LT1G at 600 mV) increases power dissipation. Select parts based on thermal and efficiency requirements of the specific application.

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