BC847AT-7 Equivalent & Substitute Parts

Part Overview

The BC847AT-7 is a small-signal NPN bipolar junction transistor manufactured by Diodes Incorporated in SOT-523 surface mount package. This device is rated for 45 V collector-emitter breakdown voltage, 100 mA maximum collector current, and 150 mW power dissipation with a 100 MHz transition frequency. The BC847AT-7 is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain electrical and mechanical compatibility for existing designs or new production requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector-Emitter Breakdown Voltage (Max)	45	V
Collector Current (Max)	100	mA
Power Dissipation (Max)	150	mW
Transition Frequency	100	MHz
DC Current Gain (hFE Min) @ Ic, Vce	110 @ 2mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	600mV @ 5mA, 100mA	—
Collector Cutoff Current (Max)	15	nA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package	SOT-523	—

Substitute Part Grouping Explanation

Substitution of the BC847AT-7 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Transistor type: NPN
Collector-emitter breakdown voltage: 45 V (minimum)
Collector current rating: 100 mA (minimum)
Power dissipation: 150 mW (minimum)
Transition frequency: 100 MHz (minimum)
DC current gain (hFE): 110 minimum at specified conditions
Operating temperature range: -55°C to 150°C (minimum)

Package Compatibility: Substitutes are grouped into three categories based on package type: SOT-523 (direct mechanical equivalent), SOT-323 (alternative small-signal package), SOT-23 (larger alternative package), and SC-75/SOT-416 (alternative package). Package selection depends on PCB layout constraints and thermal requirements.

Compliance Considerations: RoHS3 compliance status and product lifecycle status (Active vs. Discontinued/Last Time Buy) are secondary selection criteria that do not affect electrical equivalence but influence long-term availability and regulatory requirements.

Parameter Comparison

Part Number	Manufacturer	Vce(BR)max (V)	Ic(Max) (mA)	Power (mW)	fT (MHz)	hFE(Min) @ Ic, Vce	Vce(Sat) (mV)	Package	Status
BC847AT-7	Diodes Inc.	45	100	150	100	110 @ 2mA, 5V	600 @ 5mA, 100mA	SOT-523	Discontinued
BC847AT-7-F	Diodes Inc.	45	100	150	100	110 @ 2mA, 5V	600 @ 5mA, 100mA	SOT-523	Active
BC847AT-TP	Micro Commercial Co	45	100	150	100	110 @ 2mA, 5V	600 @ 5mA, 100mA	SOT-523	Active
BC847A-TP	Micro Commercial Co	45	100	225	100	110 @ 2mA, 5V	500 @ 5mA, 100mA	SOT-23	Active
BC847AW,115	NXP Semiconductors	45	100	200	100	110 @ 2mA, 5V	400 @ 5mA, 100mA	SOT-323	Active
BC847AW,135	Nexperia USA Inc.	45	100	200	100	110 @ 2mA, 5V	400 @ 5mA, 100mA	SOT-323	Active
BC847BE6327HTSA1	Infineon Technologies	45	100	330	250	200 @ 2mA, 5V	600 @ 5mA, 100mA	SOT-23	Last Time Buy
BC847BTT1G	onsemi	45	100	225	100	200 @ 2mA, 5V	600 @ 5mA, 100mA	SC-75/SOT-416	Active
BC847BW,115	NXP USA Inc.	45	100	200	100	200 @ 2mA, 5V	400 @ 5mA, 100mA	SOT-323	Active
BC847BW,135	Nexperia USA Inc.	45	100	200	100	200 @ 2mA, 5V	400 @ 5mA, 100mA	SOT-323	Active

Engineering Selection Recommendations

Direct Mechanical Equivalent (SOT-523 Package):

BC847AT-7-F (Diodes Incorporated) is the primary substitute for BC847AT-7. This part maintains identical electrical specifications and package form factor while offering Active product status with RoHS3 compliance. Inventory availability is significantly higher (23,400 pcs vs. 758 pcs), ensuring supply continuity.

BC847AT-TP (Micro Commercial Co) provides an alternative SOT-523 equivalent with identical electrical parameters and Active status. This option is suitable when Diodes Incorporated sourcing is constrained.

Alternative Package Options:

BC847A-TP (Micro Commercial Co, SOT-23) and BC847AW,115 / BC847AW,135 (NXP/Nexperia, SOT-323) offer increased power dissipation (200–225 mW) and improved thermal performance compared to the original SOT-523 package. These parts are suitable for designs where thermal margin is a consideration. SOT-23 package provides the highest power rating (225 mW) and lowest saturation voltage (500 mV).

BC847BTT1G (onsemi, SC-75/SOT-416) offers 225 mW power dissipation in a larger surface mount package with extended thermal capability.

Enhanced Performance Option:

BC847BE6327HTSA1 (Infineon Technologies, SOT-23) exceeds the original specification with 250 MHz transition frequency, 330 mW power dissipation, and higher DC current gain (200 vs. 110). This part is suitable for applications requiring improved high-frequency performance. Product status is Last Time Buy, limiting long-term availability.

Compliance and Availability:

All recommended substitutes maintain RoHS3 compliance and REACH compliance status. BC847AT-7-F, BC847AT-TP, BC847A-TP, and all NXP/Nexperia variants (BC847AW,115; BC847AW,135; BC847BW,115; BC847BW,135) carry Active product status, ensuring continued availability. BC847BTT1G (onsemi) is also Active with substantial inventory (305,700 pcs).

Frequently Asked Questions (FAQ)

Q: Can BC847AT-7-F directly replace BC847AT-7 without PCB modification?

A: Yes. BC847AT-7-F maintains identical electrical specifications and SOT-523 package form factor. No PCB layout changes are required. The primary difference is product status (Active vs. Discontinued) and RoHS3 compliance.

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

A: BC847A and BC847B variants differ in DC current gain (hFE) specifications. BC847A has minimum hFE of 110 at specified conditions, while BC847B has minimum hFE of 200. Both maintain identical voltage, current, and frequency ratings. Selection depends on circuit gain requirements.

Q: Can I use SOT-323 package parts (BC847AW,135, BC847BW,135) as substitutes for SOT-523?

A: SOT-323 parts are electrically equivalent but require PCB layout modification due to different package footprint and pin spacing. SOT-323 packages are smaller than SOT-523. Verify PCB design constraints before substitution.

Q: Is BC847BE6327HTSA1 a suitable long-term replacement?

A: BC847BE6327HTSA1 exceeds electrical specifications (250 MHz vs. 100 MHz, 330 mW vs. 150 mW) and is electrically compatible. However, Last Time Buy status indicates limited future availability. Use this part only when enhanced performance is required and long-term supply is not critical.

Q: What are the thermal implications of switching from SOT-523 to SOT-23 package?

A: SOT-23 package (BC847A-TP) provides improved thermal performance with 225 mW power rating versus 150 mW for SOT-523. Thermal resistance is lower in SOT-23, allowing higher power dissipation in the same operating temperature range. This is beneficial for high-current or high-frequency applications.

Q: Are NXP/Nexperia BC847AW and BC847BW variants automotive-qualified?

A: BC847AW,115 and BC847BW,115 carry AEC-Q101 automotive qualification and Automotive grade designation. BC847AW,135 and BC847BW,135 are Active but do not list automotive qualification in provided specifications. Verify automotive requirements with manufacturer datasheets if AEC-Q101 compliance is mandatory.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging?

A: Tape & Reel packaging is supplied on continuous carrier tape suitable for automated pick-and-place assembly. Cut Tape is supplied in smaller quantities on cut segments of carrier tape. Both contain identical components; packaging format affects handling and assembly process only.

Q: Can BC847AT-7 be used in high-frequency applications above 100 MHz?

A: BC847AT-7 has 100 MHz transition frequency specification. Operation above this frequency is not recommended. BC847BE6327HTSA1 (250 MHz) is suitable for applications requiring higher frequency performance.

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