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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

NXP Semiconductors BF370,112

Name: BF370,112
Brand: NXP Semiconductors
SKU: BF370,112
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BF370,112

Manufacturer:: NXP Semiconductors

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: BF370,112.pdf

Description:: TRANS NPN 15V 0.1A TO-92-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BF370 from NXP Semiconductors is an NPN medium-frequency transistor in TO-92 (SOT54) package, rated for V_CEO = 15 V, I_C = 100 mA DC, P_tot = 500 mW, and f_T = 500 MHz at I_C = 10 mA. It serves as a low-noise IF preamplifier stage in analog television receivers.

For engineers reviewing the BF370 datasheet, BF370 pinout, BF370 application, or BF370 equivalent, key selection considerations include its 15 V collector-emitter breakdown rating, 500 MHz transition frequency, 2.2 pF collector capacitance, TO-92 mechanical compatibility, and suitability for medium-frequency small-signal amplification with low DC bias requirements.

Technical Context

The BF370 is a silicon planar epitaxial NPN transistor optimized for medium-frequency small-signal amplification. Its design emphasizes low junction capacitance (C_c = 2.2 pF, C_e = 4.5 pF) and high f_T (500 MHz at 10 mA), enabling stable gain in IF stages up to ~100 MHz.

It operates under low-voltage, low-current conditions: V_CEO ≤ 15 V, I_C ≤ 100 mA DC, with thermal resistance R_th(j-a) = 250 K/W on FR4 PCB. Cut-off currents are tightly specified - ICBO ≤ 400 nA at 25 °C and ≤ 30 µA at 125 °C - supporting reliable operation across consumer temperature ranges.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	15 V - maximum safe collector-emitter voltage before breakdown; defines usable supply headroom in IF amplifier rails
I_C (DC)	100 mA - max continuous collector current; sets upper limit for bias point selection in linear amplification
f_T	500 MHz - transition frequency at I_C = 10 mA; indicates usable bandwidth for small-signal gain at medium frequencies
C_c	2.2 pF - collector-base capacitance at V_CB = 10 V; directly impacts high-frequency stability and tuning range in resonant IF stages
P_tot	500 mW - total power dissipation at T_amb ≤ 25 °C; determines thermal derating curve and PCB copper area requirements
h_FE	40 min - DC current gain at V_CE = 1 V, I_C = 10 mA; establishes minimum base drive needed for target collector current

Pinout & Package

Package: TO-92 (SOT54 / SC-43A), plastic single-ended leaded through-hole package with 3 leads; outline conforms to IEC/JEDEC standards, body dimensions 4.8 × 4.2 × 14.5 mm (L × E × L).

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Reference terminal for bias network; connected to ground or emitter degeneration resistor in common-emitter IF amplifier configuration
2	Base	Input control node; receives AC-coupled IF signal via tuned circuit or transformer; requires precise DC biasing for linear operation
3	Collector	Output node; drives tuned collector load (e.g., IF transformer secondary); polarity and voltage swing constrained by V_CEO = 15 V rating

Key Features

Feature	Design Value
Medium-frequency optimization	f_T = 500 MHz and low C_c/C_e enable stable 30–100 MHz gain without neutralization in TV IF strips
Low-voltage operation	V_CEO = 15 V and V_EBO = 4.5 V support compact, low-power IF stages compatible with legacy TV supply rails
Thermal robustness on FR4	R_th(j-a) = 250 K/W allows 500 mW dissipation with modest PCB copper; no heatsink required in standard TV chassis layout
Stable leakage over temperature	ICBO ≤ 30 µA at 125 °C ensures predictable DC operating point drift in enclosed TV cabinets

Applications

Television IF Amplifier	FM Radio IF Stage
Use Scenario: Amplifying 38.9 MHz intercarrier IF signal in analog PAL/NTSC TV receivers prior to video detection. IC Role / Device Role / Timing Role: NPN small-signal amplifier in common-emitter configuration with tuned collector load. Use Value: 500 MHz f_T and 2.2 pF C_c ensure flat 30–45 MHz gain response and minimal phase distortion in multi-stage IF strip.	Use Scenario: Boosting 10.7 MHz IF signal in portable FM radio front-ends before quadrature detection. IC Role / Device Role / Timing Role: Low-noise voltage amplifier with emitter degeneration for gain stability. Use Value: h_FE ≥ 40 and low ICBO support consistent biasing across battery voltage range (1.8–3.6 V) and ambient temperatures.
Video Signal Buffer	Low-Frequency Oscillator Core
Use Scenario: Isolating and impedance-matching composite video output in legacy set-top boxes or VCRs. IC Role / Device Role / Timing Role: Emitter-follower buffer stage providing low-output-impedance drive to 75 Ω coaxial line. Use Value: 100 mA I_C rating and 500 mW P_tot allow sustained 1 V_PP video swing into reactive loads without clipping or thermal shift.	Use Scenario: Active device in Colpitts or Hartley oscillator generating local oscillator signals near 50–100 MHz. IC Role / Device Role / Timing Role: Gain element sustaining oscillation with low-phase-noise characteristics. Use Value: High f_T and low feedback capacitance (C_re = 1.6 pF) reduce frequency pulling and improve spectral purity in LC-tuned oscillators.

Television IF Amplifier

FM Radio IF Stage

Use Scenario: Amplifying 38.9 MHz intercarrier IF signal in analog PAL/NTSC TV receivers prior to video detection.

IC Role / Device Role / Timing Role: NPN small-signal amplifier in common-emitter configuration with tuned collector load.

Use Value: 500 MHz f_T and 2.2 pF C_c ensure flat 30–45 MHz gain response and minimal phase distortion in multi-stage IF strip.

Use Scenario: Boosting 10.7 MHz IF signal in portable FM radio front-ends before quadrature detection.

IC Role / Device Role / Timing Role: Low-noise voltage amplifier with emitter degeneration for gain stability.

Use Value: h_FE ≥ 40 and low ICBO support consistent biasing across battery voltage range (1.8–3.6 V) and ambient temperatures.

Video Signal Buffer

Low-Frequency Oscillator Core

Use Scenario: Isolating and impedance-matching composite video output in legacy set-top boxes or VCRs.

IC Role / Device Role / Timing Role: Emitter-follower buffer stage providing low-output-impedance drive to 75 Ω coaxial line.

Use Value: 100 mA I_C rating and 500 mW P_tot allow sustained 1 V_PP video swing into reactive loads without clipping or thermal shift.

Use Scenario: Active device in Colpitts or Hartley oscillator generating local oscillator signals near 50–100 MHz.

IC Role / Device Role / Timing Role: Gain element sustaining oscillation with low-phase-noise characteristics.

Use Value: High f_T and low feedback capacitance (C_re = 1.6 pF) reduce frequency pulling and improve spectral purity in LC-tuned oscillators.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN medium-frequency amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC546B	V_CEO = 65 V, f_T = 300 MHz, h_FE = 200–450 - higher voltage rating but lower f_T and higher gain spread	More suitable for general-purpose amplification above 15 V rails; less optimal for narrowband 30–50 MHz IF where f_T margin matters	Select BC546B only if higher breakdown voltage or tighter h_FE binning is required; verify stability at target IF frequency
2N2222A	V_CEO = 40 V, f_T = 250 MHz, P_tot = 500 mW - broader voltage capability but significantly lower transition frequency	Better for wideband or switching use; insufficient f_T margin for stable 40+ MHz IF gain without neutralization	Use 2N2222A only in non-critical, lower-frequency (<25 MHz) amplifiers where gain-bandwidth trade-off is acceptable

Compared with BC546B and 2N2222A, the BF370 delivers superior medium-frequency performance (500 MHz f_T) within its 15 V/100 mA envelope, making it uniquely suited for legacy TV IF designs where bandwidth, capacitance, and thermal behavior are co-optimized.

Availability

BF370 is available at Aetrix Electronics and suitable for television IF amplifiers, FM radio IF stages, video signal buffering, and low-frequency oscillator circuits requiring stable component supply and long-lifecycle support.

Supply support for BF370 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer electronics.

The BF370 belongs to NXP's legacy discrete transistor product line, engineered specifically for analog signal conditioning in broadcast receiver systems - particularly IF amplification where gain, bandwidth, and thermal stability intersect.

FAQ

What is the maximum collector-emitter voltage rating for the BF370?

The BF370 has a maximum collector-emitter voltage (V_CEO) rating of 15 V under open-base conditions. This value is absolute - exceeding it risks irreversible breakdown. The BF370 is designed for low-voltage IF amplifier applications, and its 15 V rating aligns with typical analog TV supply architectures. Operation must remain within this limit even during transient conditions, as confirmed in the NXP product data sheet revision 2004 Nov 08.

Does the BF370 support operation at 100 MHz?

Yes, the BF370 supports operation at 100 MHz due to its 500 MHz transition frequency (f_T) measured at I_C = 10 mA and V_CE = 10 V. While usable gain decreases with frequency, the device maintains sufficient f_T margin for stable small-signal amplification in 30–100 MHz IF bands. Real-world performance depends on proper biasing, layout, and external matching - as validated in NXP's reference IF amplifier configurations.

What package type is used for the BF370?

The BF370 is housed in a TO-92 plastic package, also designated SOT54 or SC-43A. It is a through-hole, single-ended leaded package with three leads, standardized per IEC/JEDEC outlines. Dimensions are 4.8 mm (D) × 4.2 mm (E) × 14.5 mm (L), with 2.54 mm lead pitch. This package enables manual soldering and is mechanically compatible with legacy TV service and production tooling.

Can the BF370 replace the BC108 in IF amplifier designs?

The BF370 is not a direct replacement for the BC108 due to differences in f_T (500 MHz vs. ~150 MHz), capacitance (C_c = 2.2 pF vs. ~5 pF), and gain profile. While both are TO-92 NPN transistors, the BF370's higher f_T and lower capacitance make it better suited for modernized IF stages demanding extended bandwidth. Circuit re-optimization - especially collector load and emitter degeneration - is required if substituting BF370 for BC108.

What is the thermal resistance of the BF370 when mounted on FR4?

The BF370 has a junction-to-ambient thermal resistance (R_th(j-a)) of 250 K/W when mounted on a standard FR4 printed-circuit board, as specified in the NXP datasheet. This value assumes no added copper pour or heatsinking. At 25 °C ambient, the device can dissipate up to 500 mW; above that temperature, derating is required linearly - e.g., ~300 mW at 75 °C ambient - to maintain T_j ≤ 150 °C.

BF370,112 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Packaging:: Bulk

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 15 V

Vce Saturation (Max) @ Ib, Ic:: -

Current - Collector Cutoff (Max):: 400nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 10mA, 1V

Power - Max:: 500 mW

Frequency - Transition:: 500MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

BF370,112 FAQ

1.How can I place an order for BF370,112 through Aetrix?

Please submit a Request for Quotation (RFQ) for BF370,112 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BF370,112 reliable?

The price and inventory of BF370,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BF370,112 is usually 5 days.

3.What payment methods are accepted for BF370,112?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BF370,112 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BF370,112?

BF370,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BF370,112 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BF370,112?

For technical support, including BF370,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BF370,112 requirements.

6.How does Aetrix verify that BF370,112 is sourced from the original manufacturer or authorized distributors?

All BF370,112 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BF370,112 meets industry standards.

7.What is the process for return or replacement of BF370,112?

All BF370,112 units undergo pre-shipment inspection (PSI). If there is an issue with BF370,112, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BF370,112 part is unused and in its original packaging.

Return procedure for BF370,112:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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