BC849AMTF Equivalent & Substitute Parts

Part Overview

The BC849AMTF is an NPN bipolar junction transistor manufactured by onsemi, housed in a SOT-23-3 surface mount package. This device is rated for 30 V collector-emitter breakdown voltage with a maximum collector current of 100 mA and 310 mW power dissipation. The BC849AMTF is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility within the specified parameter ranges while meeting current product availability and compliance requirements.

Key Parameters

Parameter	BC849AMTF Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	30	V
Current - Collector (Ic) (Max)	100	mA
Vce Saturation (Max) @ Ib, Ic	600mV @ 5mA, 100mA	V
DC Current Gain (hFE) (Min) @ Ic, Vce	110 @ 2mA, 5V	—
Power - Max	310	mW
Frequency - Transition	300	MHz
Package / Case	SOT-23-3	—
Mounting Type	Surface Mount	—
Operating Temperature (Max)	150	°C

Substitute Part Grouping Explanation

Substitution of the BC849AMTF is determined by the following critical parameters:

Electrical Compatibility Requirements:

Transistor type must be NPN
Voltage - Collector Emitter Breakdown must be ≥ 30 V
Current - Collector (Ic) must be ≥ 100 mA
Vce Saturation must not exceed 600 mV @ 5mA, 100mA
DC Current Gain (hFE) must be ≥ 110 @ 2mA, 5V
Power dissipation must be ≥ 310 mW
Frequency - Transition should support 300 MHz operation

Mechanical Compatibility Requirements:

Package must be SOT-23-3 (TO-236-3, SC-59)
Mounting type must be Surface Mount

Compliance Requirements:

RoHS3 compliance preferred for active parts
Moisture Sensitivity Level 1 (Unlimited)
REACH Unaffected status

Substitute parts are grouped into two categories: direct electrical equivalents with identical base specifications, and similar parts with enhanced electrical performance that remain backward compatible within the application envelope.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) mA	Vce (Max) V	hFE (Min) @ 2mA, 5V	Power (Max) mW	Frequency (Max) MHz	Temp Range °C	RoHS3
BC849AMTF	onsemi	Obsolete	100	30	110	310	300	—55 to 150	—
BC848ALT1G	onsemi	Active	100	30	110	300	100	—55 to 150	Yes
BC848BLT1G	onsemi	Active	100	30	200	300	100	—55 to 150	Yes
BC848BLT3G	onsemi	Active	100	30	200	300	100	—55 to 150	Yes
BC849BLT1G	onsemi	Active	100	30	200	300	100	—55 to 150	Yes
BC849CLT1G	onsemi	Active	100	30	420	300	100	—55 to 150	Yes
MMBT2222LT1G	onsemi	Active	600	30	100	300	250	—55 to 150	Yes
MMBT6429LT1G	onsemi	Active	200	45	500	225	700	—55 to 150	Yes
NSVBCW32LT1G	onsemi	Active	100	32	200	225	—	—55 to 150	Yes
BC848A-7-F	Diodes Incorporated	Active	100	30	110	300	300	—65 to 150	Yes
BC848A-TP	Micro Commercial Co	Active	100	30	110	225	100	—55 to 150	Yes

Engineering Selection Recommendations

Primary Substitutes (Direct Electrical Equivalents):

BC848ALT1G and BC848A-7-F are the preferred direct substitutes for BC849AMTF. Both parts maintain identical collector current (100 mA), collector-emitter breakdown voltage (30 V), and DC current gain (110 @ 2mA, 5V) specifications. BC848A-7-F from Diodes Incorporated offers extended temperature range (—65°C to 150°C) compared to the standard —55°C to 150°C. Both parts are active products with RoHS3 compliance and unlimited moisture sensitivity rating.

Secondary Substitutes (Enhanced Performance):

BC848BLT1G, BC848BLT3G, BC849BLT1G, and BC849CLT1G are active onsemi products with identical voltage and current ratings but higher DC current gain specifications (200 to 420 @ 2mA, 5V). These parts are electrically compatible and suitable for applications where higher gain is acceptable or beneficial. All maintain SOT-23-3 packaging and RoHS3 compliance.

Extended Performance Alternatives:

MMBT2222LT1G supports higher collector current (600 mA) at the same 30 V breakdown voltage, suitable for applications requiring increased current handling. MMBT6429LT1G provides higher voltage rating (45 V) and current (200 mA) with superior frequency performance (700 MHz), applicable to higher-speed or higher-voltage circuit requirements. NSVBCW32LT1G offers slightly elevated voltage rating (32 V) with 100 mA current capability.

Cross-Manufacturer Option:

BC848A-TP from Micro Commercial Co provides a cross-manufacturer alternative with matching electrical specifications (100 mA, 30 V, 110 hFE) and active product status. This option supports supply chain diversification.

All recommended substitutes are active products with RoHS3 compliance, addressing the obsolescence of the BC849AMTF while maintaining electrical and mechanical compatibility within specified parameter ranges.

Frequently Asked Questions (FAQ)

Q: Can BC848ALT1G directly replace BC849AMTF in existing designs?

A: Yes. BC848ALT1G maintains identical electrical specifications for collector current (100 mA), collector-emitter breakdown voltage (30 V), DC current gain (110 @ 2mA, 5V), and Vce saturation (600 mV @ 5mA, 100mA). Both use SOT-23-3 packaging. The primary difference is transition frequency (100 MHz vs. 300 MHz), which is acceptable for most low-frequency applications. Verify application frequency requirements before substitution.

Q: What is the difference between BC848 and BC849 series parts?

A: BC848 and BC849 are distinct base product numbers from onsemi, both available in SOT-23-3 packaging with identical voltage and current ratings. The primary distinction is in DC current gain specifications and product variants (A, B, C grades). BC849CLT1G offers the highest gain (420 @ 2mA, 5V) among available substitutes. Selection depends on application gain requirements.

Q: Are there differences between Cut Tape (CT) and Tape & Reel (TR) packaging options?

A: Cut Tape and Tape & Reel are supply format options for the same SOT-23-3 component. Electrical and mechanical specifications are identical. Selection is based on production volume and assembly equipment compatibility. Both formats maintain the same moisture sensitivity level (1 - Unlimited) and RoHS3 compliance.

Q: Can MMBT2222LT1G be used as a substitute for BC849AMTF?

A: MMBT2222LT1G is electrically compatible for voltage (30 V) and power dissipation (300 mW) but supports higher collector current (600 mA vs. 100 mA). This part is suitable for applications requiring increased current capacity. Verify that the application circuit can tolerate the higher current rating and different Vce saturation characteristics (1.6 V @ 50mA, 500mA vs. 600 mV @ 5mA, 100mA).

Q: What is the significance of the temperature range difference between BC848ALT1G (—55°C to 150°C) and BC848A-7-F (—65°C to 150°C)?

A: BC848A-7-F from Diodes Incorporated extends the lower operating temperature limit to —65°C, providing 10°C additional margin for cold environment applications. For standard industrial applications operating above —55°C, both parts are functionally equivalent. Select BC848A-7-F only if extended low-temperature operation is required.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts (BC848ALT1G, BC848BLT1G, BC848BLT3G, BC849BLT1G, BC849CLT1G, MMBT2222LT1G, MMBT6429LT1G, NSVBCW32LT1G, BC848A-7-F, and BC848A-TP) are RoHS3 compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

Q: Can BC849CLT1G with hFE of 420 replace BC849AMTF with hFE of 110?

A: Yes, BC849CLT1G is a direct substitute from an electrical and mechanical standpoint. The higher DC current gain (420 vs. 110) is a performance enhancement that does not prevent substitution. Applications designed for hFE of 110 will function with higher gain, though circuit biasing may require adjustment if the design relies on specific gain characteristics. Verify bias network compatibility in gain-sensitive applications.

Q: What is the inventory status of substitute parts?

A: BC849CLT1G has the highest inventory (33,100 pcs), followed by BC848ALT1G (42,400 pcs) and BC848A-7-F (44,400 pcs). All recommended substitutes are in active production with substantial stock availability, ensuring supply continuity for the obsolete BC849AMTF.

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