BC847BT-7 Equivalent & Substitute Parts

Part Overview

The BC847BT-7 is a small-signal NPN bipolar junction transistor manufactured by Diodes Incorporated in SOT-523 surface mount packaging. This general-purpose transistor is rated for 45 V collector-emitter breakdown voltage, 100 mA maximum collector current, and 150 mW power dissipation with a transition frequency of 100 MHz. The BC847BT-7 is discontinued at DiGi Electronics, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with variations in packaging, power rating, or frequency response that remain compatible within the application's design constraints.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	45	V
Current - Collector (Ic) (Max)	100	mA
Power - Max	150	mW
Frequency - Transition	100	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 2mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	600mV @ 5mA, 100mA	—
Current - Collector Cutoff (Max)	15	nA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-523	—
RoHS Status	Non-compliant	—

Substitute Part Grouping Explanation

Substitution of the BC847BT-7 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters (Must Match or Exceed):

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 45 V minimum
Current - Collector (Ic) (Max): 100 mA minimum
Frequency - Transition: 100 MHz minimum
DC Current Gain (hFE) (Min) @ Ic, Vce: 200 @ 2mA, 5V minimum
Operating Temperature Range: -55°C to 150°C minimum

Allowable Variations:

Package / Case: SOT-523, SOT-323, SOT-23, or SC-70 (surface mount variants)
Power - Max: 150 mW or greater
Vce Saturation: 600 mV or lower
Current - Collector Cutoff (Max): 15 nA or lower
RoHS Status: Compliant or non-compliant (application-dependent)
Product Status: Active or Last Time Buy (discontinued parts require verification)

Substitute parts are grouped by packaging type and electrical performance tier. Parts maintaining identical SOT-523 packaging with active product status are primary equivalents. Parts with alternative surface mount packages (SOT-323, SOT-23, SC-70) are secondary substitutes requiring PCB layout verification. Parts with enhanced power ratings or frequency response are suitable for designs with margin requirements.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce Breakdown (Max)	Power (Max)	Frequency (Min)	hFE (Min)	Package	Product Status	RoHS
BC847BT-7	Diodes Incorporated	100 mA	45 V	150 mW	100 MHz	200 @ 2mA, 5V	SOT-523	Discontinued	Non-compliant
BC847BT-7-F	Diodes Incorporated	100 mA	45 V	150 mW	100 MHz	200 @ 2mA, 5V	SOT-523	Active	ROHS3 Compliant
BC847BTQ-7	Diodes Incorporated	100 mA	45 V	150 mW	100 MHz	200 @ 2mA, 5V	SOT-523	Active	ROHS3 Compliant
BC847A-TP	Micro Commercial Co	100 mA	45 V	225 mW	100 MHz	110 @ 2mA, 5V	SOT-23	Active	ROHS3 Compliant
BC847AW,115	NXP Semiconductors	100 mA	45 V	200 mW	100 MHz	110 @ 2mA, 5V	SOT-323	Active	Not specified
BC847AW,135	Nexperia USA Inc.	100 mA	45 V	200 mW	100 MHz	110 @ 2mA, 5V	SOT-323	Active	ROHS3 Compliant
BC847AWT1G	onsemi	100 mA	45 V	150 mW	100 MHz	110 @ 2mA, 5V	SC-70	Active	ROHS3 Compliant
BC847BE6327HTSA1	Infineon Technologies	100 mA	45 V	330 mW	250 MHz	200 @ 2mA, 5V	SOT-23	Last Time Buy	ROHS3 Compliant
BC847BTT1G	onsemi	100 mA	45 V	225 mW	100 MHz	200 @ 2mA, 5V	SC-75	Active	ROHS3 Compliant
BC847BW,115	NXP USA Inc.	100 mA	45 V	200 mW	100 MHz	200 @ 2mA, 5V	SOT-323	Active	Not specified
BC847BW,135	Nexperia USA Inc.	100 mA	45 V	200 mW	100 MHz	200 @ 2mA, 5V	SOT-323	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Equivalent (Direct Replacement):

BC847BT-7-F is the primary equivalent for the discontinued BC847BT-7. Both parts are manufactured by Diodes Incorporated with identical electrical specifications and SOT-523 packaging. BC847BT-7-F maintains active product status and achieves ROHS3 compliance, making it the preferred direct replacement for new designs and production continuity.

Secondary Equivalent (Same Manufacturer, Alternative Packaging):

BC847BTQ-7 is manufactured by Diodes Incorporated with identical electrical specifications to the BC847BT-7 but supplied in Tape & Reel packaging with automotive-grade qualification (AEC-Q101). This part is suitable for applications requiring automotive-qualified components or high-volume reel packaging. Product status is active with ROHS3 compliance.

Functional Substitutes (Alternative Manufacturers, Comparable Performance):

BC847BTT1G (onsemi) provides equivalent electrical performance in SC-75 (SOT-416) packaging with 225 mW power rating. This part maintains the 200 @ 2mA, 5V hFE specification and is ROHS3 compliant with active product status.

BC847BW,115 and BC847BW,135 (NXP USA Inc.) are SOT-323 packaged alternatives with 200 mW power rating and 200 @ 2mA, 5V hFE specification. Both parts are active with automotive qualification (AEC-Q101). BC847BW,135 is ROHS3 compliant.

Enhanced Performance Substitutes (Higher Power or Frequency):

BC847BE6327HTSA1 (Infineon Technologies) offers enhanced specifications with 330 mW power rating and 250 MHz transition frequency in SOT-23 packaging. This part is ROHS3 compliant but carries Last Time Buy status, limiting long-term availability.

BC847A-TP (Micro Commercial Co) provides 225 mW power rating in SOT-23 packaging with active product status and ROHS3 compliance. This part features lower hFE (110 @ 2mA, 5V) and is suitable for applications with relaxed gain requirements.

Alternative Package Substitutes (Reduced Footprint):

BC847AW,115 and BC847AW,135 (NXP Semiconductors / Nexperia USA Inc.) are SOT-323 packaged alternatives with 200 mW power rating. Both maintain 100 mA collector current and 45 V breakdown voltage. BC847AW,135 is ROHS3 compliant with active status.

BC847AWT1G (onsemi) is an SC-70 packaged alternative with 150 mW power rating, matching the original BC847BT-7 power specification. This part is ROHS3 compliant with active product status.

Frequently Asked Questions (FAQ)

Q: Can BC847BT-7-F be used as a direct replacement for BC847BT-7?

A: Yes. BC847BT-7-F is electrically and mechanically identical to BC847BT-7, with identical SOT-523 packaging, 100 mA collector current, 45 V breakdown voltage, 150 mW power rating, and 200 @ 2mA, 5V hFE specification. The primary difference is product status (active vs. discontinued) and RoHS compliance (ROHS3 vs. non-compliant). No design changes are required.

Q: What is the difference between BC847BT-7 and BC847BTQ-7?

A: Both parts are manufactured by Diodes Incorporated with identical electrical specifications. The primary difference is packaging format: BC847BT-7 is supplied in Cut Tape format, while BC847BTQ-7 is supplied in Tape & Reel format. BC847BTQ-7 includes automotive-grade qualification (AEC-Q101). Both maintain SOT-523 packaging and are suitable for identical applications.

Q: Can I use BC847AW,135 (SOT-323) instead of BC847BT-7 (SOT-523)?

A: BC847AW,135 is electrically compatible with BC847BT-7, maintaining 100 mA collector current, 45 V breakdown voltage, and 100 MHz transition frequency. However, SOT-323 and SOT-523 are different surface mount packages with different footprints and pin configurations. PCB layout modification is required. BC847AW,135 features lower hFE (110 vs. 200 @ 2mA, 5V) and higher power rating (200 mW vs. 150 mW).

Q: Why does BC847BE6327HTSA1 have higher power and frequency ratings?

A: BC847BE6327HTSA1 is manufactured by Infineon Technologies and represents an enhanced performance variant with 330 mW power dissipation and 250 MHz transition frequency. These specifications exceed the BC847BT-7 baseline, providing design margin for applications requiring higher power handling or faster switching. This part is suitable for designs with enhanced performance requirements but carries Last Time Buy status.

Q: Which substitute part has the best long-term availability?

A: BC847BT-7-F (Diodes Incorporated) and BC847BTT1G (onsemi) both carry active product status with ROHS3 compliance, indicating ongoing manufacturing and distribution support. BC847BT-7-F is the preferred choice due to identical packaging (SOT-523) and electrical specifications. BC847BTT1G is a secondary choice with SC-75 packaging requiring PCB layout verification.

Q: Are all substitute parts RoHS compliant?

A: No. The original BC847BT-7 is RoHS non-compliant. Most substitute parts listed (BC847BT-7-F, BC847BTQ-7, BC847A-TP, BC847AW,135, BC847AWT1G, BC847BE6327HTSA1, BC847BTT1G, BC847BW,135) are ROHS3 compliant. BC847AW,115 and BC847BW,115 do not specify RoHS status. Verify RoHS compliance requirements for your application before selection.

Q: What is the difference between BC847A and BC847B variants?

A: BC847A and BC847B variants differ in DC current gain (hFE) specification. BC847B variants (including BC847BT-7, BC847BT-7-F, BC847BTQ-7, BC847BTT1G, BC847BW,115, BC847BW,135) specify 200 @ 2mA, 5V hFE minimum. BC847A variants (BC847A-TP, BC847AW,115, BC847AW,135, BC847AWT1G) specify 110 @ 2mA, 5V hFE minimum. Both variants maintain identical voltage, current, and frequency specifications. Selection depends on gain requirements for your circuit design.

Q: Can I substitute BC847BT-7 with a part in different packaging without PCB redesign?

A: No. SOT-523, SOT-323, SOT-23, and SC-70 are distinct surface mount packages with different footprints, pin spacing, and land patterns. Any package change requires PCB layout modification and verification. If PCB redesign is not feasible, BC847BT-7-F is the only option maintaining identical SOT-523 packaging.

Q: What does "Last Time Buy" status mean for BC847BE6327HTSA1?

A: Last Time Buy status indicates that Infineon Technologies has announced end-of-life for this part. Manufacturing will cease after a specified date, and inventory will be depleted. While currently available, this part is not recommended for new designs requiring long-term production support. Use BC847BT-7-F or BC847BTT1G for ongoing availability assurance.

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