BC640TAR Equivalent & Substitute Parts

Part Overview

The BC640TAR is a PNP bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a maximum collector current of 1 A, collector-emitter breakdown voltage of 80 V, and a transition frequency of 100 MHz. The BC640TAR is packaged in a TO-92-3 through-hole configuration with a maximum power dissipation of 1 W.

The BC640TAR holds an obsolete product status. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for applications currently utilizing this component.

Key Parameters

Parameter	Value	Unit
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)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 150mA, 2V	—
Power - Max	1	W
Frequency - Transition	100	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	—

Substitute Part Grouping Explanation

Substitution of the BC640TAR is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters establish substitution validity:

Transistor Type: PNP configuration
Maximum Collector Current: 1 A
Collector-Emitter Breakdown Voltage: 80 V
Vce Saturation Characteristics: 500mV @ 50mA, 500mA
Collector Cutoff Current: 100nA (ICBO)
DC Current Gain (hFE): 40 minimum @ 150mA, 2V
Maximum Power Dissipation: 1 W
Transition Frequency: 100 MHz
Operating Temperature: 150°C (TJ)
Package Configuration: TO-92-3 through-hole

Substitute parts must match all parameters listed above. Packaging format differences (tape, tube, or reel configurations) do not affect electrical equivalence when the base product number and electrical specifications remain identical.

Parameter Comparison

Parameter	BC640TAR (Main Part)	BC640TA (Substitute)	Match Status
Manufacturer	onsemi	onsemi	Identical
Transistor Type	PNP	PNP	Identical
Current - Collector (Ic) (Max)	1 A	1 A	Identical
Voltage - Collector Emitter Breakdown (Max)	80 V	80 V	Identical
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA	Identical
Current - Collector Cutoff (Max)	100nA (ICBO)	100nA (ICBO)	Identical
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 150mA, 2V	40 @ 150mA, 2V	Identical
Power - Max	1 W	1 W	Identical
Frequency - Transition	100MHz	100MHz	Identical
Operating Temperature (TJ)	150°C	150°C	Identical
Mounting Type	Through Hole	Through Hole	Identical
Package / Case	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	Identical
Product Status	Obsolete	Active	Different
Packaging Format	Tape and Reel	Cut Tape (CT)	Different
RoHS Status	Not Specified	ROHS3 Compliant	Different

Engineering Selection Recommendations

The BC640TA serves as a direct parametric equivalent to the BC640TAR. All electrical specifications, mechanical dimensions, and functional characteristics are identical. The primary distinction is product status: BC640TAR is obsolete while BC640TA maintains active production status.

The BC640TA is ROHS3 compliant, whereas compliance information for the BC640TAR is not provided. Both parts share identical REACH status (REACH Unaffected) and ECCN classification (EAR99).

Packaging format differs between the two parts: BC640TAR is supplied in tape and reel configuration, while BC640TA is available in cut tape format. This distinction affects procurement and handling procedures but does not impact electrical performance or circuit functionality.

For new designs or applications requiring component replacement, BC640TA is the appropriate selection due to its active product status and regulatory compliance documentation. For existing inventory management of BC640TAR-based systems, BC640TA provides complete functional and electrical interchangeability.

Frequently Asked Questions (FAQ)

Q: Can BC640TA replace BC640TAR in existing circuit designs?

A: Yes. BC640TA is a parametric equivalent with identical electrical specifications, maximum ratings, and performance characteristics. All electrical parameters including collector current, breakdown voltage, saturation characteristics, current gain, power dissipation, and transition frequency are identical. The TO-92-3 package configuration is unchanged.

Q: What is the difference between BC640TAR and BC640TA?

A: The parts are electrically and mechanically identical. BC640TAR is obsolete; BC640TA is in active production. BC640TA is ROHS3 compliant with documented regulatory status. Packaging format differs: BC640TAR uses tape and reel; BC640TA uses cut tape. These differences do not affect circuit performance.

Q: Are there any compatibility concerns when substituting BC640TA for BC640TAR?

A: No compatibility concerns exist. Both parts are PNP transistors in TO-92-3 through-hole packages with identical pin configurations, electrical ratings, and performance specifications. Direct substitution is valid for all applications.

Q: Does the packaging format difference affect electrical performance?

A: No. Packaging format (tape and reel versus cut tape) affects only procurement, storage, and handling procedures. Electrical performance and circuit functionality remain unchanged.

Q: What is the base product number for these parts?

A: The base product number is BC640. Both BC640TAR and BC640TA derive from this base designation with different suffix codes indicating packaging and production variants.

Q: Are both parts REACH compliant?

A: Yes. Both BC640TAR and BC640TA carry REACH Unaffected status, indicating compliance with REACH regulations.

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