2SC5865TLQ Equivalent & Substitute Parts

Part Overview

The 2SC5865TLQ is an NPN bipolar junction transistor manufactured by Rohm Semiconductor, rated for 60 V collector-emitter breakdown voltage and 1 A maximum collector current. This device is packaged in TSMT3 surface mount configuration with a maximum power dissipation of 500 mW and transition frequency of 250 MHz. The part is designated as "Not For New Designs," indicating it has been superseded in the product lifecycle. Identification of equivalent and substitute parts is necessary for applications requiring continued support, legacy system maintenance, or when the primary part becomes unavailable.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	1	A
Power - Max	500	mW
Frequency - Transition	250	MHz
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 100mA, 2V	—
Operating Temperature (Max)	150	°C
Mounting Type	Surface Mount	—
Package / Case	SC-96 (TSMT3)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 2SC5865TLQ is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): ≥ 60 V
Current - Collector (Ic) (Max): ≥ 1 A
Power - Max: ≥ 500 mW
Frequency - Transition: ≥ 250 MHz
Operating Temperature (Max): ≥ 150°C
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Package Compatibility: The 2SC5865TLQ uses TSMT3 surface mount packaging (SC-96). Substitute parts may employ alternative surface mount packages (SOT-23-3) provided they maintain electrical parameter equivalence or superiority and are compatible with the application's PCB layout and assembly process.

Substitution Groups:

Group 1: Direct Rohm Semiconductor Family (TSMT3 Package)

2SC5866TLQ and 2SC5866TLR: Higher current rating (2 A) with identical voltage and power specifications. Active product status. Direct mechanical compatibility.

Group 2: Diodes Incorporated Alternatives (SOT-23-3 Package)

DNBT8105-7, DSS4160T-7, FMMT451TA, FMMT491QTA: Meet or exceed electrical specifications with alternative packaging. Active product status. Package change requires PCB layout modification.

Group 3: Low-Current Alternatives (SOT-23-3 Package)

BC846A-7-F, BC846AQ-7-F, BC846B-7-F, BC846BQ-13-F: Lower current rating (100 mA) and power dissipation (300–310 mW). Suitable only for applications not requiring full 1 A capability.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce(br)max	Power (Max)	fT	Package	Product Status
2SC5865TLQ	Rohm Semiconductor	1 A	60 V	500 mW	250 MHz	TSMT3	Not For New Designs
2SC5866TLQ	Rohm Semiconductor	2 A	60 V	500 mW	200 MHz	TSMT3	Active
2SC5866TLR	Rohm Semiconductor	2 A	60 V	500 mW	200 MHz	TSMT3	Active
DNBT8105-7	Diodes Incorporated	1 A	60 V	600 mW	150 MHz	SOT-23-3	Active
DSS4160T-7	Diodes Incorporated	1 A	60 V	725 mW	150 MHz	SOT-23-3	Active
FMMT451TA	Diodes Incorporated	1 A	60 V	500 mW	150 MHz	SOT-23-3	Active
FMMT491QTA	Diodes Incorporated	1 A	60 V	500 mW	150 MHz	SOT-23-3	Active
BC846A-7-F	Diodes Incorporated	100 mA	65 V	300 mW	300 MHz	SOT-23-3	Active
BC846AQ-7-F	Diodes Incorporated	100 mA	65 V	310 mW	300 MHz	SOT-23-3	Active
BC846B-7-F	Diodes Incorporated	100 mA	65 V	300 mW	300 MHz	SOT-23-3	Active
BC846BQ-13-F	Diodes Incorporated	100 mA	65 V	310 mW	300 MHz	SOT-23-3	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Package, TSMT3):

The 2SC5866TLQ and 2SC5866TLR are the preferred substitutes. Both are manufactured by Rohm Semiconductor and maintain the TSMT3 surface mount package, eliminating PCB layout modifications. These parts feature higher maximum collector current (2 A) compared to the 2SC5865TLQ (1 A), providing design margin for current-limited applications. Both are Active products with ROHS3 compliance and MSL 1 rating. The transition frequency reduction from 250 MHz to 200 MHz is acceptable for applications not requiring the full bandwidth of the original part.

For Alternative Package Substitution (SOT-23-3):

When PCB layout modifications are acceptable, the following Diodes Incorporated parts provide equivalent or superior electrical performance:

DNBT8105-7, DSS4160T-7, FMMT451TA, FMMT491QTA: All rated for 1 A collector current and 60 V breakdown voltage. These parts are Active products with ROHS3 compliance and MSL 1 rating. Power dissipation ranges from 500 mW to 725 mW, meeting or exceeding the 2SC5865TLQ specification. Transition frequency is 150 MHz, lower than the original part but sufficient for most general-purpose switching applications.

For Current-Limited Applications Only:

The BC846 series (BC846A-7-F, BC846AQ-7-F, BC846B-7-F, BC846BQ-13-F) are suitable only for applications where collector current does not exceed 100 mA. These parts feature higher transition frequency (300 MHz) and higher breakdown voltage (65 V) but are not suitable for 1 A operation. BC846AQ-7-F and BC846BQ-13-F include AEC-Q101 automotive qualification.

Compliance and Regulatory Status:

All substitute parts listed are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. All maintain MSL 1 (Unlimited) moisture sensitivity rating, consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can the 2SC5866TLQ directly replace the 2SC5865TLQ without PCB modifications?

A: Yes. The 2SC5866TLQ and 2SC5866TLR maintain identical TSMT3 packaging and SC-96 case dimensions. No PCB layout changes are required. The higher current rating (2 A vs. 1 A) provides additional design margin.

Q: What is the primary difference between 2SC5866TLQ and 2SC5866TLR?

A: Both parts are electrically identical. The difference is packaging format: 2SC5866TLQ is supplied in Cut Tape (CT) & Digi-Reel®, while 2SC5866TLR is also supplied in Cut Tape (CT) & Digi-Reel®. Inventory levels differ. Selection depends on procurement and assembly requirements.

Q: Why do the Diodes Incorporated alternatives (DNBT8105-7, DSS4160T-7, FMMT451TA, FMMT491QTA) have lower transition frequency (150 MHz vs. 250 MHz)?

A: These parts use SOT-23-3 packaging, which has different thermal and parasitic characteristics compared to TSMT3. The lower transition frequency is a trade-off inherent to the package change. For applications operating below 150 MHz, this difference is not functionally significant.

Q: Can BC846 series transistors replace the 2SC5865TLQ in all applications?

A: No. BC846 series transistors are rated for maximum 100 mA collector current, compared to 1 A for the 2SC5865TLQ. They are suitable only for low-current signal applications. Applications requiring 1 A operation must use 2SC5866TLQ, 2SC5866TLR, or the Diodes Incorporated 1 A alternatives.

Q: What is the impact of switching from TSMT3 to SOT-23-3 packaging?

A: SOT-23-3 is a smaller package with different pin spacing and thermal characteristics. PCB layout and footprint must be modified. Thermal performance may differ; DSS4160T-7 offers higher power dissipation (725 mW) to partially offset thermal differences. Assembly equipment compatibility must be verified.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant. The original 2SC5865TLQ is also ROHS3 compliant. No regulatory compliance issues arise from substitution.

Q: Which substitute part offers the best thermal performance?

A: DSS4160T-7 offers the highest maximum power dissipation at 725 mW, compared to 500 mW for the 2SC5865TLQ. This provides additional thermal margin for high-current or high-frequency switching applications, though the SOT-23-3 package may have lower absolute thermal conductivity than TSMT3.

Q: Is the 2SC5865TLQ still available for new designs?

A: No. The 2SC5865TLQ is designated "Not For New Designs." New designs should use 2SC5866TLQ, 2SC5866TLR, or equivalent active alternatives. Existing designs may continue to use 2SC5865TLQ inventory until depletion.

Q: What is the difference between FMMT451TA and FMMT491QTA?

A: Both are rated for 1 A, 60 V, and 500 mW. The primary difference is DC current gain: FMMT451TA has minimum hFE of 50 @ 150mA, 10V, while FMMT491QTA has minimum hFE of 100 @ 500mA, 5V. Selection depends on bias circuit requirements and gain specifications for the application.

Q: Can I use 2SC5866TLQ in a design originally specified for 2SC5865TLQ without circuit modifications?

A: Yes. The 2SC5866TLQ has identical voltage and power ratings. The higher current capability (2 A vs. 1 A) is backward compatible. Transition frequency is slightly lower (200 MHz vs. 250 MHz), which is acceptable for most applications. No circuit modifications are required.

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