BC847CTT1 Equivalent & Substitute Parts

Part Overview

The BC847CTT1 is an NPN bipolar junction transistor manufactured by onsemi, designed for small-signal switching and amplification applications. This device operates at a maximum collector voltage of 45 V with a collector current rating of 100 mA and a transition frequency of 100 MHz. The BC847CTT1 is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. Active alternatives within the BC847 family provide functional equivalence with improved availability and compliance status.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector Current (Max)	100	mA
Collector-Emitter Breakdown Voltage (Max)	45	V
Vce Saturation (Max) @ Ib, Ic	600 mV @ 5 mA, 100 mA	—
Collector Cutoff Current (Max)	15	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	420 @ 2 mA, 5 V	—
Power Dissipation (Max)	225	mW
Transition Frequency	100	MHz
Operating Temperature Range	−55 to +150	°C
Package Type	SC-75, SOT-416	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the BC847CTT1 is determined by electrical parameter compatibility and package form factor. The primary electrical parameters that define substitutability are collector current rating (100 mA), collector-emitter breakdown voltage (45 V), transition frequency (100 MHz), and DC current gain characteristics. All substitute parts listed maintain these core electrical specifications.

Substitutes are grouped into two categories based on package configuration:

Direct Substitutes (SOT-323 / SC-70 Package): BC847CW,115 and BC847CW,135 provide electrical equivalence with a smaller surface-mount package footprint. These parts maintain the 100 mA collector current, 45 V breakdown voltage, and 100 MHz transition frequency. The SOT-323 package is a miniaturized alternative to the original SC-75 package, requiring PCB layout modification.

Functional Equivalents (TO-236AB / SOT-23-3 Package): BC847B,215, BC847B,235, BC847C,215, and BC847C,235 provide electrical equivalence in the TO-236AB package format. These parts maintain core electrical ratings while offering different DC current gain specifications (200 or 420 @ 2 mA, 5 V) and increased power dissipation capability (250 mW).

Automotive-Grade Alternatives (SOT-323 Package): BC847AW,115, BC847AW,135, BC847BW,115, and BC847BW,135 provide electrical equivalence with AEC-Q101 automotive qualification. These parts are suitable for applications requiring automotive-grade component certification.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) [mA]	Vce(br) (Max) [V]	hFE (Min) @ 2mA, 5V	Power (Max) [mW]	Fт [MHz]	Package	Product Status	RoHS Compliance
BC847CTT1	onsemi	100	45	420	225	100	SC-75, SOT-416	Obsolete	Non-compliant
BC847CW,115	Nexperia USA Inc.	100	45	420	200	100	SC-70, SOT-323	Active	ROHS3 Compliant
BC847CW,135	Nexperia USA Inc.	100	45	420	200	100	SC-70, SOT-323	Active	ROHS3 Compliant
BC847AW,115	NXP Semiconductors	100	45	110	200	100	SC-70, SOT-323	Active	ROHS3 Compliant
BC847AW,135	Nexperia USA Inc.	100	45	110	200	100	SC-70, SOT-323	Active	ROHS3 Compliant
BC847B,215	Nexperia USA Inc.	100	45	200	250	100	TO-236AB, SOT-23-3	Active	ROHS3 Compliant
BC847B,235	Nexperia USA Inc.	100	45	200	250	100	TO-236AB, SOT-23-3	Active	ROHS3 Compliant
BC847BW,115	NXP USA Inc.	100	45	200	200	100	SC-70, SOT-323	Active	Not specified
BC847BW,135	Nexperia USA Inc.	100	45	200	200	100	SC-70, SOT-323	Active	ROHS3 Compliant
BC847C,215	Nexperia USA Inc.	100	45	420	250	100	TO-236AB, SOT-23-3	Active	ROHS3 Compliant
BC847C,235	Nexperia USA Inc.	100	45	420	250	100	TO-236AB, SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Electrical and Functional Replacement (Preferred):

BC847CW,115 and BC847CW,135 provide the closest electrical match to the BC847CTT1, maintaining identical collector current (100 mA), breakdown voltage (45 V), DC current gain (420 @ 2 mA, 5 V), and transition frequency (100 MHz). Both parts are manufactured by Nexperia USA Inc. and carry active product status with ROHS3 compliance. The primary design consideration is package transition from SC-75 (SOT-416) to SC-70 (SOT-323), which requires PCB layout modification. BC847CW,115 is supplied in Cut Tape & Digi-Reel packaging, while BC847CW,135 is supplied in Tape & Reel format.

For Applications Requiring Automotive Qualification:

BC847AW,135 and BC847BW,135 are qualified to AEC-Q101 automotive standards and maintain active product status. BC847AW,135 provides a DC current gain of 110 @ 2 mA, 5 V, while BC847BW,135 provides 200 @ 2 mA, 5 V. Both are supplied in Tape & Reel packaging with SOT-323 package format.

For Increased Power Dissipation Capability:

BC847C,215 and BC847C,235 offer 250 mW power dissipation (compared to 225 mW in the original part) with matching DC current gain (420 @ 2 mA, 5 V). These parts use the TO-236AB package format and are supplied in Cut Tape & Digi-Reel (215) or Tape & Reel (235) packaging.

For Intermediate DC Current Gain:

BC847B,215 and BC847B,235 provide a DC current gain of 200 @ 2 mA, 5 V with 250 mW power dissipation in TO-236AB package format. These parts are suitable for applications where the higher gain of the BC847C variants is not required.

All recommended substitutes maintain REACH compliance and are classified as EAR99 for export control purposes.

Frequently Asked Questions (FAQ)

Q: Can BC847CW,115 directly replace BC847CTT1 without circuit modification?

A: BC847CW,115 provides electrical equivalence in all critical parameters (collector current, breakdown voltage, gain, and frequency). However, package transition from SC-75 (SOT-416) to SC-70 (SOT-323) requires PCB footprint modification. The SOT-323 package is physically smaller and has different pin spacing, necessitating layout redesign.

Q: What is the difference between BC847CW,115 and BC847CW,135?

A: Both parts are electrically identical. The difference is in packaging format: BC847CW,115 is supplied in Cut Tape & Digi-Reel format, while BC847CW,135 is supplied in Tape & Reel format. Selection depends on assembly process requirements and volume.

Q: Why do BC847B and BC847C variants have different DC current gain specifications?

A: The BC847 family includes multiple gain grades designated by letter suffix. BC847A variants have hFE of 110, BC847B variants have hFE of 200, and BC847C variants have hFE of 420 (matching the original BC847CTT1). Selection depends on circuit design requirements for biasing and amplification characteristics.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts carry ROHS3 compliance status, except BC847BW,115 where compliance status is not specified in available documentation. The original BC847CTT1 is RoHS non-compliant. Substitution with RoHS-compliant alternatives is recommended for new designs and procurement.

Q: What is the significance of the packaging suffix (115 vs. 135)?

A: The numeric suffix indicates packaging format and reel configuration. Suffix 115 denotes Cut Tape & Digi-Reel packaging suitable for lower-volume or mixed-component assembly. Suffix 135 denotes Tape & Reel packaging optimized for high-volume automated assembly. Electrical performance is identical between these variants.

Q: Can BC847B,215 or BC847C,215 be used as drop-in replacements?

A: BC847B,215 and BC847C,215 provide electrical equivalence but use the TO-236AB package (SOT-23-3) instead of the original SC-75 package. This requires PCB footprint modification. The TO-236AB package is larger than SOT-323 but smaller than the original SC-75, offering a different space-performance trade-off.

Q: Which substitute is recommended for new automotive designs?

A: BC847AW,135 or BC847BW,135 are recommended for automotive applications, as both carry AEC-Q101 qualification. BC847AW,135 provides lower gain (110), while BC847BW,135 provides intermediate gain (200). Selection depends on circuit biasing requirements.

Q: Is the 225 mW power rating of BC847CTT1 critical for substitution?

A: The BC847CTT1 is rated for 225 mW. Most substitute parts (SOT-323 variants) are rated for 200 mW, while TO-236AB variants are rated for 250 mW. For applications operating near maximum power dissipation, TO-236AB variants (BC847B or BC847C in 215/235 packaging) provide additional thermal margin.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message