BC640TF Equivalent & Substitute Parts

Part Overview

The BC640TF is a PNP bipolar junction transistor manufactured by onsemi, rated for 80 V collector-emitter breakdown voltage and 1 A maximum collector current. The device is packaged in a TO-92-3 through-hole configuration and operates at frequencies up to 100 MHz with a maximum power dissipation of 1 W. The BC640TF is classified as obsolete, making identification of equivalent substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Transistor Type	PNP
Current - Collector (Ic) (Max)	1 A
Voltage - Collector Emitter Breakdown (Max)	80 V
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	100nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 150mA, 2V
Power - Max	1 W
Frequency - Transition	100MHz
Operating Temperature (TJ)	150°C
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Substitute Part Grouping Explanation

Substitution of the BC640TF is determined by electrical and mechanical parameter equivalence. The BC640TA qualifies as a direct substitute based on the following criteria:

All electrical parameters are identical: maximum collector current (1 A), collector-emitter breakdown voltage (80 V), saturation voltage (500mV @ 50mA, 500mA), collector cutoff current (100nA), DC current gain (40 @ 150mA, 2V), maximum power dissipation (1 W), and transition frequency (100MHz).

Operating temperature range is identical at 150°C maximum junction temperature.

Package and mounting configuration are identical: TO-92-3 through-hole package with formed leads.

The primary distinction between BC640TF and BC640TA is product status and packaging format. BC640TF is obsolete, while BC640TA is active. BC640TA is supplied in cut tape (CT) packaging, whereas BC640TF packaging format is not specified. Both devices share the same base product number (BC640) and are manufactured by onsemi.

Parameter Comparison

Parameter	BC640TF	BC640TA
Manufacturer	onsemi	onsemi
Transistor Type	PNP	PNP
Current - Collector (Ic) (Max)	1 A	1 A
Voltage - Collector Emitter Breakdown (Max)	80 V	80 V
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	100nA (ICBO)	100nA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 150mA, 2V	40 @ 150mA, 2V
Power - Max	1 W	1 W
Frequency - Transition	100MHz	100MHz
Operating Temperature (TJ)	150°C	150°C
Mounting Type	Through Hole	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Product Status	Obsolete	Active
RoHS Status	Not specified	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The BC640TA is the direct equivalent substitute for the BC640TF. Both devices are manufactured by onsemi and share identical electrical specifications and package configurations. The BC640TA is the preferred selection for new designs and procurement due to its active product status, ensuring long-term availability and supply chain continuity.

The BC640TA carries ROHS3 compliance certification, whereas the BC640TF compliance status is not specified. Both devices maintain REACH Unaffected status. The BC640TA is supplied in cut tape packaging, which is standard for active production components.

For applications currently using BC640TF, direct substitution with BC640TA requires no circuit modifications or design changes. Pin configuration, electrical performance, and thermal characteristics are identical between the two devices.

Frequently Asked Questions (FAQ)

Q: Can BC640TA be used as a direct replacement for BC640TF?

A: Yes. BC640TA is a direct equivalent substitute. All electrical parameters, operating temperature range, and package configuration are identical. No circuit modifications are required.

Q: What is the primary reason to substitute BC640TF with BC640TA?

A: BC640TF is classified as obsolete, while BC640TA is an active product. BC640TA ensures continued availability and supply chain reliability for new production and design support.

Q: Are there any compliance differences between BC640TF and BC640TA?

A: BC640TA is certified ROHS3 compliant. Both devices maintain REACH Unaffected status. Compliance requirements for your application should be verified against your design specifications.

Q: Is the package configuration identical between BC640TF and BC640TA?

A: Yes. Both devices use the TO-92-3 through-hole package with formed leads. Pin assignments and physical dimensions are identical, allowing direct board-level substitution.

Q: What is the difference between BC640TF and BC640TA packaging formats?

A: BC640TF packaging format is not specified in available documentation. BC640TA is supplied in cut tape (CT) packaging, which is standard for active production components. Both devices are compatible with through-hole assembly processes.

Q: Are the electrical specifications identical between BC640TF and BC640TA?

A: Yes. Maximum collector current (1 A), collector-emitter breakdown voltage (80 V), saturation voltage, collector cutoff current, DC current gain, power dissipation (1 W), and transition frequency (100MHz) are identical. Operating temperature range is also identical at 150°C maximum junction temperature.

Q: Can BC640TA be used in legacy designs originally specified for BC640TF?

A: Yes. BC640TA is a direct functional and physical equivalent. No design modifications, circuit changes, or board layout adjustments are necessary for substitution.

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