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

Toshiba Semiconductor and Storage 2SC4944-GR(TE85L,F

Name: 2SC4944-GR(TE85L,F
Brand: Toshiba Semiconductor and Storage
SKU: 2SC4944-GR(TE85L,F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SC4944-GR(TE85L,F

Manufacturer:: Toshiba Semiconductor and Storage

Category:: Single Bipolar Transistors

Package:: 5-TSSOP, SC-70-5, SOT-353

Datasheet:: 2SC4944-GR(TE85L,F.pdf

Description:: TRANS NPN 50V 0.15A USV

Quantity:: RFQ Add To RFQ list

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Inventory:9,004

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Product details

Overview

2SC4944-GR(TE85L,F) from Toshiba Electronic Devices & Storage Corporation is a silicon NPN epitaxial transistor in a small dual-package configuration, designed for audio frequency general-purpose amplifier applications. It delivers V_CEO = 50 V, I_C = 150 mA (max), h_FE = 200–400 (GR grade), excellent h_FE linearity (0.95 typ.), and f_T = 80 MHz - enabling use in low-distortion preamplifier stages and driver circuits.

For engineers reviewing the 2SC4944-GR(TE85L,F) datasheet, 2SC4944-GR(TE85L,F) pinout, 2SC4944-GR(TE85L,F) application, or 2SC4944-GR(TE85L,F) equivalent, key selection criteria include guaranteed h_FE range (200–400), V_CEO/I_C ratings for Class-A/B audio biasing, dual-transistor layout compatibility, and complementary pairing with 2SA1873 for push-pull designs.

Technical Context

This transistor employs Toshiba's PCT (Planar Collector Technology) process to achieve high-voltage capability and stable gain across operating current. Its h_FE linearity (h_FE(0.1 mA)/h_FE(2 mA) = 0.95 typ.) ensures minimal distortion in small-signal amplification, while f_T = 80 MHz supports wideband audio and IF-stage operation up to ~10 MHz.

The device is rated for T_j = 125°C (non-LF(T) variant) and dissipates 200 mW on FR4 (25.4 × 25.4 × 1.6 mm, Cu pad 0.32 mm² × 5). Its dual-die construction in the 2-2L1A package enables matched pair usage without discrete mounting, reducing layout asymmetry in differential or push-pull topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - supports rail voltages up to ±24 V in single-ended audio stages without saturation risk
I_C (max)	150 mA - sufficient for driving 10 kΩ loads at 1.5 V peak output or low-Z headphone buffers
h_FE range	200–400 (GR grade) - enables precise DC bias setting and predictable gain in fixed-bias amplifiers
f_T	80 MHz - ensures flat gain response through 20 kHz with margin for harmonic content and stability
V_CE(sat)	0.1–0.25 V @ I_C=100 mA, I_B=10 mA - minimizes voltage drop and power loss in saturated-switch or emitter-follower modes
C_ob	2–3.5 pF @ V_CB=10 V - limits Miller effect in high-gain common-emitter configurations

Pinout & Package

Package: 2-2L1A - surface-mount dual-transistor package (6.2 mg typical weight), JEITA-unregistered, compatible with standard SMT reflow profiles. Dimensions per Toshiba mechanical drawing.

Pin/Terminal	Circuit Role	Design Meaning
Emitter 1 (E1)	Current sink for Q1	Low-impedance return path; tied to ground or bias network in common-emitter amplifiers
Base 1 (B1)	Control input for Q1	Accepts bias current to set I_C1; requires series resistor for stable DC operating point
Collector 1 (C1)	Active output node for Q1	High-impedance output for voltage gain; connects to load resistor or next stage input
Collector 2 (C2)	Active output node for Q2	Independent collector terminal - enables dual-amplifier or push-pull configuration without shared nodes
Base 2 (B2)	Control input for Q2	Separate base drive allows independent biasing of Q2, critical for matched-pair differential pairs
Emitter 2 (E2)	Current sink for Q2	Isolated emitter node - supports individual emitter degeneration resistors for gain control and thermal stability

Key Features

Feature	Design Value
High h_FE linearity	h_FE(0.1 mA)/h_FE(2 mA) = 0.95 typ. - reduces harmonic distortion in low-level signal amplification
Dual-transistor integration	Two electrically isolated NPN transistors in one 2-2L1A package - eliminates component matching variance and saves PCB area
Complementary pairing	Explicitly designated as complementary to 2SA1873 - enables direct implementation of Class-B/AB push-pull output stages
Thermal robustness	T_j rating = 125°C (non-LF(T)) - supports operation in enclosed audio enclosures with ambient temperatures up to 85°C

Applications

Audio Preamp Stage	Push-Pull Output Driver
Use Scenario: Low-noise voltage amplification of microphone or line-level signals prior to ADC or power stage. IC Role / Device Role / Timing Role: NPN small-signal amplifier in common-emitter configuration with emitter degeneration. Use Value: h_FE linearity (0.95 typ.) and f_T = 80 MHz ensure <0.5% THD+N across 20 Hz–20 kHz at 1 V_PP output.	Use Scenario: Complementary Class-AB output stage driving 8 Ω speakers in portable audio systems. IC Role / Device Role / Timing Role: NPN half of push-pull pair; paired with 2SA1873 (PNP) for symmetrical conduction. Use Value: Matched h_FE range (200–400) and identical package thermal coupling minimize crossover distortion and thermal drift.
Differential Input Pair	IF Amplifier Stage
Use Scenario: Balanced signal conditioning in AM/FM radio front-ends or analog sensor interfaces. IC Role / Device Role / Timing Role: Dual NPN transistors configured as active load differential pair with shared tail current. Use Value: Electrically isolated emitters (E1/E2) allow independent degeneration resistors, improving CMRR >60 dB at 1 kHz.	Use Scenario: Intermediate-frequency amplification in superheterodyne receivers (e.g., 455 kHz or 10.7 MHz). IC Role / Device Role / Timing Role: Common-emitter amplifier with tuned collector load for selective gain peaking. Use Value: C_ob = 2–3.5 pF and f_T = 80 MHz enable stable 20 dB gain at 10.7 MHz with <3° phase shift.

Audio Preamp Stage

Push-Pull Output Driver

Use Scenario: Low-noise voltage amplification of microphone or line-level signals prior to ADC or power stage.

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

Use Value: h_FE linearity (0.95 typ.) and f_T = 80 MHz ensure <0.5% THD+N across 20 Hz–20 kHz at 1 V_PP output.

Use Scenario: Complementary Class-AB output stage driving 8 Ω speakers in portable audio systems.

IC Role / Device Role / Timing Role: NPN half of push-pull pair; paired with 2SA1873 (PNP) for symmetrical conduction.

Use Value: Matched h_FE range (200–400) and identical package thermal coupling minimize crossover distortion and thermal drift.

Differential Input Pair

IF Amplifier Stage

Use Scenario: Balanced signal conditioning in AM/FM radio front-ends or analog sensor interfaces.

IC Role / Device Role / Timing Role: Dual NPN transistors configured as active load differential pair with shared tail current.

Use Value: Electrically isolated emitters (E1/E2) allow independent degeneration resistors, improving CMRR >60 dB at 1 kHz.

Use Scenario: Intermediate-frequency amplification in superheterodyne receivers (e.g., 455 kHz or 10.7 MHz).

IC Role / Device Role / Timing Role: Common-emitter amplifier with tuned collector load for selective gain peaking.

Use Value: C_ob = 2–3.5 pF and f_T = 80 MHz enable stable 20 dB gain at 10.7 MHz with <3° phase shift.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN general-purpose amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SC4738-GR(TE85L,F)	Same 2-2L1A package; h_FE = 200–400, but f_T = 120 MHz and V_CEO = 30 V	Higher f_T suits RF-adjacent IF stages; lower V_CEO restricts use to ≤±12 V rails	Select when bandwidth >50 MHz is required and supply voltage is constrained
MMBT5551-7-F	Single SOT-23 device; h_FE = 80–250, V_CEO = 160 V, f_T = 100 MHz, no dual integration	Superior voltage rating and bandwidth, but requires two discrete placements and external matching	Select when highest V_CEO is critical and board space permits discrete layout

Compared with 2SC4944-GR(TE85L,F), 2SC4738-GR offers higher speed at reduced voltage tolerance, while MMBT5551-7-F provides greater voltage headroom and bandwidth but sacrifices integrated dual topology and h_FE linearity assurance.

Availability

2SC4944-GR(TE85L,F) is available at Aetrix Electronics and suitable for audio preamplifier design, push-pull output stages, differential input pairs, and IF amplifier circuits requiring stable component supply and consistent GR-grade h_FE binning.

Supply support for 2SC4944-GR(TE85L,F) 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

Toshiba Electronic Devices & Storage Corporation designs and manufactures discrete semiconductors, power devices, and logic ICs with emphasis on reliability, efficiency, and automotive-grade qualification.

The 2SC4944 belongs to Toshiba's legacy audio/general-purpose bipolar transistor family, engineered specifically for low-distortion linear amplification in consumer and industrial audio equipment since 1992.

FAQ

What is the h_FE classification for 2SC4944-GR(TE85L,F)?

The "GR" suffix in 2SC4944-GR(TE85L,F) denotes the h_FE bin: 200–400 at V_CE = 6 V and I_C = 2 mA. This grading ensures predictable DC biasing and gain stability in production audio amplifier designs. The 2SC4944-GR(TE85L,F) is tested and marked to meet this specification, distinguishing it from the Y-grade (120–240) variant.

Is 2SC4944-GR(TE85L,F) pin-compatible with other Toshiba dual transistors?

Yes - 2SC4944-GR(TE85L,F) uses the standardized 2-2L1A package with fixed pinout (E1–B1–C1–C2–B2–E2). It shares mechanical and electrical pin compatibility with 2SC4943, 2SC4738, and 2SC5001 in the same footprint, enabling drop-in substitution where h_FE, V_CEO, and f_T requirements align. Always verify absolute maximum ratings before replacement.

Does 2SC4944-GR(TE85L,F) have RoHS compliance documentation?

Yes - 2SC4944-GR(TE85L,F) complies with EU RoHS Directive 2011/65/EU. Toshiba confirms lead-free solderability and absence of restricted substances per its official environmental reports. Full compliance data, including test certificates and material declarations, is accessible via Toshiba's product page for 2SC4944-GR(TE85L,F) under "Environmental Information."

What is the thermal derating behavior of 2SC4944-GR(TE85L,F)?

2SC4944-GR(TE85L,F) has a junction-to-ambient thermal resistance (R_θJA) of approximately 625°C/W on FR4 (25.4 × 25.4 × 1.6 mm, Cu pad 0.32 mm² × 5). Power dissipation must be linearly derated above 25°C ambient: −1.6 mW/°C beyond 25°C, reaching 0 mW at 125°C case temperature. This applies to the non-LF(T) variant per Toshiba Note 2.

Can 2SC4944-GR(TE85L,F) replace 2SC4944-Y(TE85L,F) in existing designs?

Yes - both share identical package, pinout, and absolute maximum ratings. The only difference is h_FE: 2SC4944-GR(TE85L,F) guarantees 200–400 versus 120–240 for the Y-grade. Substituting GR for Y improves gain predictability and reduces bias spread, but may require minor adjustment of base resistors if original design relied on minimum h_FE = 120.

2SC4944-GR(TE85L,F Specifications

Product attributes: Attribute value

Manufacturer:: Toshiba Semiconductor and Storage

Series:: -

Package/Case:: 5-TSSOP, SC-70-5, SOT-353

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 150 mA

Voltage - Collector Emitter Breakdown (Max):: 50 V

Vce Saturation (Max) @ Ib, Ic:: 250mV @ 10mA, 100mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 2mA, 6V

Power - Max:: 200 mW

Frequency - Transition:: 80MHz

Operating Temperature:: 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: USV

2SC4944-GR(TE85L,F FAQ

1.How can I place an order for 2SC4944-GR(TE85L,F through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SC4944-GR(TE85L,F 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 2SC4944-GR(TE85L,F reliable?

The price and inventory of 2SC4944-GR(TE85L,F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SC4944-GR(TE85L,F is usually 5 days.

3.What payment methods are accepted for 2SC4944-GR(TE85L,F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SC4944-GR(TE85L,F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SC4944-GR(TE85L,F?

2SC4944-GR(TE85L,F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SC4944-GR(TE85L,F 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 2SC4944-GR(TE85L,F?

For technical support, including 2SC4944-GR(TE85L,F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SC4944-GR(TE85L,F requirements.

6.How does Aetrix verify that 2SC4944-GR(TE85L,F is sourced from the original manufacturer or authorized distributors?

All 2SC4944-GR(TE85L,F 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 2SC4944-GR(TE85L,F meets industry standards.

7.What is the process for return or replacement of 2SC4944-GR(TE85L,F?

All 2SC4944-GR(TE85L,F units undergo pre-shipment inspection (PSI). If there is an issue with 2SC4944-GR(TE85L,F, 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 2SC4944-GR(TE85L,F part is unused and in its original packaging.

Return procedure for 2SC4944-GR(TE85L,F:

1.Submit a request within 90 days.

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

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