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Toshiba Semiconductor and Storage 2SC4738-Y,LF
- Part No.:
- 2SC4738-Y,LF
- Manufacturer:
- Toshiba Semiconductor and Storage
- Category:
- Single Bipolar Transistors
- Package:
- SC-75, SOT-416
- Datasheet:
-
2SC4738-Y,LF.pdf
- Description:
- TRANS NPN 50V 0.15A SSM
- Quantity:
- Payment:
- Shipping:
Inventory:13,760
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Product details
Overview
2SC4738-Y,LF from Toshiba Electronic Devices & Storage Corporation is a silicon NPN epitaxial bipolar transistor in SSM (SOT-416) package, rated for VCEO = 50 V, IC = 150 mA max, and hFE = 120–240 (Y-class), designed for low-frequency amplification in AM radio receivers and general-purpose analog signal stages.
For engineers reviewing the 2SC4738-Y,LF datasheet, 2SC4738-Y,LF pinout, 2SC4738-Y,LF application, or 2SC4738-Y,LF equivalent, key selection criteria include AEC-Q101 qualification status, hFE linearity (0.95 typ.), VCE(sat) ≤ 0.25 V at IC = 100 mA/IB = 10 mA, fT = 80 MHz typ., and SOT-416 thermal derating on FR4 board.
Technical Context
This NPN transistor operates in linear active mode for analog amplification, with verified hFE linearity across IC = 0.1 mA to 2 mA and guaranteed VCEO = 50 V under DC conditions. Its fT = 80 MHz typ. supports stable gain up to low-VHF bands while maintaining low Cob = 3.5 pF at VCB = 10 V.
The device uses epitaxial base construction to achieve tight hFE distribution (Y rank: 120–240) and low VCE(sat) of 0.25 V max, enabling efficient Class-A amplifier stages with minimal thermal drift. It is complementary to 2SA1832 for push-pull configurations in audio and AM IF amplifiers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V - Maximum collector-emitter voltage before breakdown; enables use in 24 V rail amplifiers with safety margin. |
| IC (max) | 150 mA - Continuous DC collector current handling; supports medium-power preamp and driver stages. |
| hFE (Y rank) | 120–240 - Guaranteed DC current gain range at VCE = 6 V, IC = 2 mA; ensures predictable bias stability. |
| VCE(sat) | ≤ 0.25 V at IC = 100 mA, IB = 10 mA - Low saturation voltage minimizes power loss in switching or saturated amplifier modes. |
| fT | 80 MHz (typ.) - Transition frequency confirms usable gain-bandwidth for AM IF (455 kHz) and low-VHF applications. |
| Cob | 3.5 pF at VCB = 10 V - Low output capacitance reduces Miller effect, improving high-frequency stability in common-emitter amps. |
| PC (on FR4) | 120 mW - Power dissipation limit on 25.4 mm × 25.4 mm × 1.6 mm FR4 board; defines thermal design envelope. |
Pinout & Package
Package: SSM (JEDEC SOT-416), surface-mount, 3-pin plastic package weighing 2.4 mg (typ.). Dimensions conform to standard SOT-416 footprint with 0.95 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal for forward-biased junction; requires current-limited drive to maintain hFE linearity. |
| 2 | Emitter | Current sink node; connected to ground or bias network in common-emitter configuration. |
| 3 | Collector | Output node carrying amplified current; routed to load resistor or next stage with minimal trace inductance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive ambient temperature range (−40°C to +125°C junction) and reliability stress testing. |
| hFE linearity ratio | 0.95 (typ.) - hFE(IC=0.1 mA)/hFE(IC=2 mA); ensures consistent small-signal gain across operating current range. |
| Complementary pairing | Matched with 2SA1832 PNP for balanced push-pull amplifier topologies in AM IF and audio output stages. |
| Low Cob | 3.5 pF - Reduces feedback capacitance in high-gain CE amplifiers, easing stability compensation. |
Applications
| AM Radio Intermediate Frequency Amplifier | Automotive Cabin Audio Preamp Stage |
|---|---|
Use Scenario: Amplifies 455 kHz IF signal after mixer in analog AM receiver front-end. IC Role / Device Role / Timing Role: NPN small-signal amplifier in common-emitter configuration with fixed emitter degeneration. Use Value: hFE linearity (0.95) maintains distortion-free gain across signal amplitude variations; VCEO = 50 V accommodates supply ripple. |
Use Scenario: Low-noise voltage amplifier for microphone or line-level input in vehicle infotainment head units. IC Role / Device Role / Timing Role: Linear gain block with DC-coupled input and emitter-follower output buffer. Use Value: AEC-Q101 qualification ensures operation at 105°C ambient; 120–240 hFE enables precise biasing without trimming. |
| Industrial Sensor Signal Conditioning | Legacy Consumer Electronics Repair |
Use Scenario: Amplifies mV-level thermistor or bridge sensor outputs in programmable logic controller I/O modules. IC Role / Device Role / Timing Role: Single-transistor non-inverting amplifier with resistive feedback network. Use Value: Low VCE(sat) ≤ 0.25 V preserves dynamic range in 5 V rail systems; SOT-416 footprint allows compact PCB layout. |
Use Scenario: Replacement for obsolete transistors in vintage AM/FM radios, tape decks, and CRT monitor deflection circuits. IC Role / Device Role / Timing Role: Direct-fit discrete gain element in through-hole or SMT retrofits using adapter pads. Use Value: Pin-compatible with legacy SSM-footprint designs; Y-rank hFE matches original calibration points in service manuals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN small-signal amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 2SC4738-GR,LF | hFE = 200–400 (GR rank); otherwise identical electrical specs and package. | Better suited for higher-gain, lower-bias-current stages where tighter hFE tolerance is required. | Select when circuit gain stability demands hFE > 200 at IC = 2 mA; same PCB layout and thermal profile. |
| MMBT4401LT1G | VCEO = 40 V (vs. 50 V); hFE = 100–300; SOT-23 package (not pin-compatible). | Lacks AEC-Q101 rating; not validated for automotive ambient or reliability stress. | Use only in non-automotive, cost-sensitive consumer designs where 40 V rating suffices and board rework is acceptable. |
Compared with 2SC4738-GR,LF, the 2SC4738-Y,LF offers lower but more tightly bounded hFE for predictable biasing in production-amplifier arrays; versus MMBT4401LT1G, it provides higher voltage margin and automotive qualification-critical for infotainment and sensor signal chains.
Availability
2SC4738-Y,LF is available at Aetrix Electronics and suitable for AM radio IF amplifiers, automotive cabin audio preamps, and industrial sensor signal conditioning requiring stable component supply with AEC-Q101 compliance and long-term obsolescence management.
Supply support for 2SC4738-Y,LF 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, automotive qualification, and industrial longevity.
The 2SC4738-Y,LF belongs to Toshiba's legacy SSM-packaged bipolar transistor family, engineered for analog signal integrity in cost-sensitive, high-volume consumer and automotive electronics.
FAQ
What is the hFE classification and test condition for 2SC4738-Y,LF?
The 2SC4738-Y,LF is classified as Y-rank with hFE = 120–240, measured at VCE = 6 V and IC = 2 mA per Toshiba Rev.4.0.A datasheet. This range ensures repeatable bias point selection in production amplifier circuits without individual transistor sorting.
Is 2SC4738-Y,LF qualified for automotive applications?
Yes, 2SC4738-Y,LF is AEC-Q101 qualified per the official Toshiba orderable part number list. It meets stress testing requirements for temperature cycling, HTRB, and ESD, supporting use in automotive cabin audio and body control modules up to 125°C junction temperature.
What is the maximum power dissipation for 2SC4738-Y,LF on a standard PCB?
The 2SC4738-Y,LF has PC = 120 mW when mounted on a 25.4 mm × 25.4 mm × 1.6 mm FR4 board with specified copper pad area. Derating begins above 25°C ambient at 1.2 mW/°C, limiting safe continuous operation to ~70°C ambient at full rating.
How does the hFE linearity specification benefit amplifier design with 2SC4738-Y,LF?
The hFE linearity ratio of 0.95 (typ.)-defined as hFE at IC = 0.1 mA divided by hFE at IC = 2 mA-ensures minimal gain variation across signal swing in Class-A amplifiers. This directly reduces harmonic distortion in AM IF and audio preamp stages using 2SC4738-Y,LF.
What is the pin configuration and package type of 2SC4738-Y,LF?
The 2SC4738-Y,LF uses the SSM package (JEDEC SOT-416) with pin 1 = Base, pin 2 = Emitter, pin 3 = Collector. Its 0.95 mm lead pitch and 2.4 mg weight enable high-density placement in space-constrained analog PCBs.
2SC4738-Y,LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- -
- Package/Case:
- SC-75, SOT-416
- 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:
- 120 @ 2mA, 6V
- Power - Max:
- 100 mW
- Frequency - Transition:
- 80MHz
- Operating Temperature:
- 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SSM
2SC4738-Y,LF FAQ
1.How can I place an order for 2SC4738-Y,LF through Aetrix?
Please submit a Request for Quotation (RFQ) for 2SC4738-Y,LF 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 2SC4738-Y,LF reliable?
The price and inventory of 2SC4738-Y,LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SC4738-Y,LF is usually 5 days.
3.What payment methods are accepted for 2SC4738-Y,LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SC4738-Y,LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2SC4738-Y,LF?
2SC4738-Y,LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2SC4738-Y,LF 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 2SC4738-Y,LF?
For technical support, including 2SC4738-Y,LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SC4738-Y,LF requirements.
6.How does Aetrix verify that 2SC4738-Y,LF is sourced from the original manufacturer or authorized distributors?
All 2SC4738-Y,LF 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 2SC4738-Y,LF meets industry standards.
7.What is the process for return or replacement of 2SC4738-Y,LF?
All 2SC4738-Y,LF units undergo pre-shipment inspection (PSI). If there is an issue with 2SC4738-Y,LF, 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 2SC4738-Y,LF part is unused and in its original packaging.
Return procedure for 2SC4738-Y,LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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