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Toshiba Semiconductor and Storage 2SC4738-BL(TE85L,F
- Part No.:
- 2SC4738-BL(TE85L,F
- Manufacturer:
- Toshiba Semiconductor and Storage
- Category:
- Single Bipolar Transistors
- Package:
- SC-75, SOT-416
- Datasheet:
-
2SC4738-BL(TE85L,F.pdf
- Description:
- TRANS NPN 50V 0.15A SSM
- Quantity:
- Payment:
- Shipping:
Inventory:2,717
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Product details
Overview
2SC4738-BL(TE85L,F) from Toshiba Electronic Devices & Storage Corporation is a silicon NPN epitaxial bipolar transistor designed for low-frequency amplification, with VCEO = 50 V, IC(max) = 150 mA, hFE = 350–700 (BL rank), and AEC-Q101 qualification for automotive use. It operates in AM amplifier stages and general-purpose analog signal conditioning circuits.
For engineers reviewing the 2SC4738-BL(TE85L,F) datasheet, 2SC4738-BL(TE85L,F) pinout, 2SC4738-BL(TE85L,F) application, or 2SC4738-BL(TE85L,F) equivalent, key selection considerations include its SOT-416 (SSM) package, hFE linearity (0.95 typ.), VCE(sat) ≤ 0.25 V at IC = 100 mA/IB = 10 mA, fT = 80 MHz typ., and AEC-Q101 compliance status.
Technical Context
This transistor employs an epitaxial base structure to achieve high hFE linearity and stable gain across collector current (IC = 0.1 mA to 2 mA). Its design supports low-distortion amplification in AM receiver front-ends and bias-stable audio preamplifier stages.
The device meets AEC-Q101 stress test requirements for automotive applications, including temperature cycling, HTRB, and ESD robustness. Its SSM package enables high-density PCB layouts while maintaining thermal performance up to Tj = 125 °C under defined board conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V - Supports operation in 24 V automotive supply rails with margin against transients. |
| IC(max) | 150 mA - Enables driver-stage amplification without external current boosting. |
| hFE | 350–700 (BL rank) - Ensures consistent DC biasing and predictable small-signal gain in production designs. |
| VCE(sat) | ≤ 0.25 V @ IC = 100 mA, IB = 10 mA - Minimizes power loss and self-heating in saturated switching or Class-A amplifier operation. |
| fT | 80 MHz (typ.) - Provides usable bandwidth for AM IF stages and low-frequency RF amplification up to ~10 MHz. |
| Cob | 3.5 pF @ VCB = 10 V - Limits Miller capacitance impact on high-frequency stability in common-emitter configurations. |
Pinout & Package
Package: SOT-416 (JEDEC), also known as SSM - ultra-small surface-mount package (2.0 × 1.25 × 0.9 mm), weight 2.4 mg (typ.), suitable for space-constrained automotive and portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal for forward-biased junction; requires current-limited drive to ensure hFE linearity and avoid saturation delay. |
| 2 | Emitter | Common reference node in CE configuration; connected to ground or low-impedance return path for stable biasing. |
| 3 | Collector | Output terminal carrying amplified current; routed over thermal pad or copper pour to manage 120 mW dissipation at Ta = 25 °C. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including HTOL, TC, and ESD testing - enables use in non-safety-critical vehicle subsystems. |
| hFE linearity ratio | hFE(IC=0.1 mA)/hFE(IC=2 mA) = 0.95 (typ.) - reduces harmonic distortion in linear amplifiers without feedback compensation. |
| Complementary pairing | Matched with 2SA1832 PNP - allows balanced push-pull output stages and differential amplifier topologies. |
| Low Cob | 3.5 pF - improves high-frequency gain flatness and phase margin in multi-stage amplifiers. |
Applications
| AM Radio Front-End Amplifier | Automotive Cabin Audio Preamp |
|---|---|
Use Scenario: Amplifies weak AM band signals (530–1710 kHz) after antenna coupling and before mixer stage. IC Role / Device Role / Timing Role: NPN common-emitter small-signal amplifier with fixed bias network. Use Value: High hFE and low VCE(sat) enable >20 dB voltage gain with <1% THD at 1 mW output, supporting legacy AM receiver architectures. | Use Scenario: Boosts microphone or line-level input in infotainment head units prior to ADC sampling. IC Role / Device Role / Timing Role: DC-coupled, single-supply NPN preamplifier with emitter degeneration. Use Value: AEC-Q101 qualification and hFE linearity ensure consistent gain matching across temperature (−40 °C to +105 °C) in cabin environments. |
| Low-Voltage Sensor Signal Conditioning | Industrial Control Relay Driver |
Use Scenario: Amplifies millivolt-level outputs from thermistors or bridge sensors in PLC analog input modules. IC Role / Device Role / Timing Role: High-input-impedance common-collector buffer followed by CE gain stage. Use Value: 350–700 hFE range allows precise gain setting via resistor ratios without trimming, reducing BOM count. | Use Scenario: Switches 24 VDC relay coils in factory automation I/O cards using microcontroller GPIO. IC Role / Device Role / Timing Role: Saturated switch with base current limiting and flyback diode integration. Use Value: VCEO = 50 V and IC = 150 mA support 24 V relay loads with 2× voltage margin; SSM package saves board area in dense I/O layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN bipolar transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 2SC4738-Y(TE85L,F) | hFE = 120–240 (Y rank); lower gain variation but reduced maximum hFE. | Suitable for cost-sensitive consumer audio where tighter hFE tolerance is prioritized over gain headroom. | Select when consistent low-gain behavior is required and AEC-Q101 is not mandatory. |
| MMBT3904LT1G | hFE = 100–300; VCEO = 40 V; SOT-23 package; no AEC-Q101 qualification. | General-purpose replacement in non-automotive industrial controls or prototyping. | Choose for legacy compatibility or where 40 V rating suffices and automotive qualification is unnecessary. |
Compared with 2SC4738-Y(TE85L,F) and MMBT3904LT1G, the 2SC4738-BL(TE85L,F) delivers higher gain linearity and automotive-grade reliability at the expense of narrower hFE binning tolerance - optimal for AM amplification and sensor interfaces requiring stable performance across temperature and life cycle.
Availability
2SC4738-BL(TE85L,F) is available at Aetrix Electronics and suitable for AM radio receivers, automotive cabin audio systems, and industrial sensor signal conditioning requiring stable component supply and long-term lifecycle support.
Supply support for 2SC4738-BL(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 automotive, industrial, and consumer applications.
The 2SC4738 series belongs to Toshiba's automotive-qualified bipolar transistor product line, engineered specifically for low-frequency analog signal amplification and switching in harsh-environment electronics.
FAQ
What is the hFE range for 2SC4738-BL(TE85L,F)?
The 2SC4738-BL(TE85L,F) has a guaranteed DC current gain (hFE) range of 350 to 700 at VCE = 6 V and IC = 2 mA. This BL rank designation ensures higher gain consistency compared to Y or GR variants, making it suitable for precision biasing in low-noise amplifier designs where gain predictability is critical. The 2SC4738-BL(TE85L,F) achieves this through controlled epitaxial layer doping and process optimization.
Is 2SC4738-BL(TE85L,F) qualified for automotive applications?
Yes, the 2SC4738-BL(TE85L,F) is AEC-Q101 qualified, as confirmed in Toshiba's official orderable part number list and datasheet Rev. 4.0.A. This qualification covers temperature cycling, high-temperature reverse bias, and electrostatic discharge tests required for non-safety-critical automotive electronics. The 2SC4738-BL(TE85L,F) is rated for operation from −40 °C to +125 °C junction temperature.
What package does 2SC4738-BL(TE85L,F) use?
The 2SC4738-BL(TE85L,F) uses the SOT-416 package, also designated SSM by Toshiba. It measures 2.0 mm × 1.25 mm × 0.9 mm with a typical weight of 2.4 mg. Pin 1 is Base, Pin 2 is Emitter, and Pin 3 is Collector. This ultra-small outline supports high-density PCB layouts in space-constrained applications like automotive infotainment modules.
What is the maximum collector-emitter voltage rating for 2SC4738-BL(TE85L,F)?
The maximum collector-emitter voltage (VCEO) for 2SC4738-BL(TE85L,F) is 50 V, as specified in Toshiba's Absolute Maximum Ratings table. This rating applies at Ta = 25 °C and ensures safe operation under transient conditions in 24 V automotive systems. Derating is required above 25 °C ambient per the PC–Ta derating curves in the datasheet.
How does 2SC4738-BL(TE85L,F) compare to its complementary PNP counterpart?
The 2SC4738-BL(TE85L,F) is explicitly designed as complementary to the 2SA1832 PNP transistor. Both share matched hFE ranges, thermal characteristics, and SSM packaging, enabling balanced push-pull output stages and differential amplifier pairs. This complementarity simplifies design of symmetrical analog circuits without gain or offset mismatch concerns in the 2SC4738-BL(TE85L,F) and 2SA1832 pair.
2SC4738-BL(TE85L,F 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:
- 350 @ 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-BL(TE85L,F FAQ
1.How can I place an order for 2SC4738-BL(TE85L,F through Aetrix?
Please submit a Request for Quotation (RFQ) for 2SC4738-BL(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 2SC4738-BL(TE85L,F reliable?
The price and inventory of 2SC4738-BL(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 2SC4738-BL(TE85L,F is usually 5 days.
3.What payment methods are accepted for 2SC4738-BL(TE85L,F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SC4738-BL(TE85L,F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2SC4738-BL(TE85L,F?
2SC4738-BL(TE85L,F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2SC4738-BL(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 2SC4738-BL(TE85L,F?
For technical support, including 2SC4738-BL(TE85L,F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SC4738-BL(TE85L,F requirements.
6.How does Aetrix verify that 2SC4738-BL(TE85L,F is sourced from the original manufacturer or authorized distributors?
All 2SC4738-BL(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 2SC4738-BL(TE85L,F meets industry standards.
7.What is the process for return or replacement of 2SC4738-BL(TE85L,F?
All 2SC4738-BL(TE85L,F units undergo pre-shipment inspection (PSI). If there is an issue with 2SC4738-BL(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 2SC4738-BL(TE85L,F part is unused and in its original packaging.
Return procedure for 2SC4738-BL(TE85L,F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
2SC4738-BL(TE85L,F Tags
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