BD682STU Equivalent & Substitute Parts

Part Overview

The BD682STU is a PNP Darlington bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 4 A maximum collector current. This device is packaged in the TO-126-3 through-hole configuration and is designed for general-purpose switching and amplification applications requiring moderate power dissipation of 14 W.

The BD682STU is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for legacy systems utilizing this component.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP - Darlington	—
Current - Collector (Ic) (Max)	4	A
Voltage - Collector Emitter Breakdown (Max)	100	V
Vce Saturation (Max) @ Ib, Ic	2.5V @ 30mA, 1.5A	—
Current - Collector Cutoff (Max)	500	µA
DC Current Gain (hFE) (Min) @ Ic, Vce	750 @ 1.5A, 3V	—
Power - Max	14	W
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-225AA, TO-126-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BD682STU is determined by equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

Transistor type: PNP - Darlington configuration
Maximum collector current: 4 A
Maximum collector-emitter breakdown voltage: 100 V
Saturation voltage characteristics: 2.5V @ 30mA, 1.5A
Collector cutoff current: 500µA
DC current gain (hFE): 750 @ 1.5A, 3V

Mechanical Equivalence Criteria:

Mounting type: Through Hole
Package designation: TO-126-3 or TO-126 (pin-compatible variants)

Compliance Criteria:

RoHS3 compliance status
REACH unaffected status
Moisture sensitivity level compatibility

The substitute parts BD682G, BD682S, and BD682 share identical electrical specifications with the BD682STU. Differences exist in product status (active versus obsolete), maximum power rating, and operating temperature range. These differences do not affect functional substitution in applications designed for the BD682STU electrical parameters.

Parameter Comparison

Parameter	BD682STU	BD682G	BD682S	BD682
Manufacturer	onsemi	onsemi	onsemi	onsemi
Transistor Type	PNP - Darlington	PNP - Darlington	PNP - Darlington	PNP - Darlington
Current - Collector (Ic) (Max)	4 A	4 A	4 A	4 A
Voltage - Collector Emitter Breakdown (Max)	100 V	100 V	100 V	100 V
Vce Saturation (Max) @ Ib, Ic	2.5V @ 30mA, 1.5A	2.5V @ 30mA, 1.5A	2.5V @ 30mA, 1.5A	2.5V @ 30mA, 1.5A
Current - Collector Cutoff (Max)	500µA	500µA	500µA	500µA
DC Current Gain (hFE) (Min) @ Ic, Vce	750 @ 1.5A, 3V	750 @ 1.5A, 3V	750 @ 1.5A, 3V	750 @ 1.5A, 3V
Power - Max	14 W	40 W	14 W	40 W
Operating Temperature (TJ)	150°C	-55°C ~ 150°C	150°C	-55°C ~ 150°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-225AA, TO-126-3	TO-225AA, TO-126-3	TO-225AA, TO-126-3	TO-225AA, TO-126-3
Product Status	Obsolete	Active	Obsolete	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Not Applicable	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

BD682G is the primary substitute for BD682STU applications. This part maintains identical electrical specifications and pin compatibility while offering active product status, ensuring continued availability and manufacturer support. BD682G provides extended operating temperature range (-55°C to 150°C) and increased maximum power rating (40 W) compared to the BD682STU. Both parts are ROHS3 compliant and REACH unaffected. BD682G is suitable for direct replacement in new designs and legacy system maintenance.

BD682S provides functional equivalence to BD682STU with identical electrical and thermal specifications. This part is classified as obsolete and carries the same 14 W power rating and 150°C maximum operating temperature as the BD682STU. BD682S is ROHS3 compliant and REACH unaffected. Selection of BD682S is appropriate only when inventory availability of BD682G is constrained and design requirements do not benefit from the extended temperature range or increased power rating.

BD682 (base part number variant) maintains electrical equivalence but is classified as RoHS non-compliant. This part is obsolete and does not meet current regulatory requirements for new production. BD682 is suitable only for repair or maintenance of legacy systems where RoHS compliance is not mandated. The extended operating temperature range (-55°C to 150°C) and 40 W power rating provide design flexibility if required by application constraints.

For new designs and ongoing production requiring RoHS3 compliance, BD682G is the recommended substitute. For legacy system support where RoHS compliance is not applicable, BD682G remains the preferred choice due to active product status.

Frequently Asked Questions (FAQ)

Q: Can BD682G directly replace BD682STU in existing circuit designs?

A: Yes. BD682G maintains identical electrical specifications, saturation voltage characteristics, current gain, and pin configuration as BD682STU. The TO-126-3 package is mechanically and electrically compatible. No circuit modifications are required.

Q: What is the difference between BD682STU and BD682G?

A: The primary differences are product status and thermal specifications. BD682STU is obsolete with a maximum operating temperature of 150°C and 14 W power rating. BD682G is active with an extended operating temperature range of -55°C to 150°C and 40 W power rating. All electrical parameters are identical.

Q: Is BD682G RoHS3 compliant?

A: Yes. BD682G is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components in most jurisdictions.

Q: Can BD682 be used as a substitute for BD682STU?

A: BD682 is electrically equivalent but is RoHS non-compliant and obsolete. Use of BD682 is restricted to repair and maintenance of legacy systems where RoHS compliance is not mandated. For new production, BD682G is the appropriate substitute.

Q: What is the significance of the TO-126-3 package designation?

A: TO-126-3 indicates a three-lead through-hole package in the TO-225AA case style. All substitute parts (BD682G, BD682S, BD682) are compatible with this package designation and are pin-compatible for direct board-level replacement.

Q: Does the increased power rating of BD682G (40 W versus 14 W) affect substitution compatibility?

A: No. The increased power rating of BD682G does not affect functional substitution. Applications designed for the 14 W BD682STU operate within the 40 W capability of BD682G. The higher power rating provides additional thermal margin and design flexibility without requiring circuit modifications.

Q: Are there operating temperature considerations when substituting BD682STU with BD682G?

A: BD682STU is rated to 150°C maximum junction temperature. BD682G extends this range to -55°C to 150°C. For applications operating at the upper temperature limit (150°C), both parts are functionally equivalent. Applications requiring operation below 0°C benefit from the extended range of BD682G.

Q: What is the moisture sensitivity level (MSL) of BD682G?

A: BD682G is listed as "Not Applicable" for MSL, indicating this parameter does not apply to the bulk packaging format. BD682STU carries MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Both parts are suitable for standard storage and handling conditions.

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