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onsemi 2SA1774T1
- Part No.:
- 2SA1774T1
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- SC-75, SOT-416
- Datasheet:
-
2SA1774T1.pdf
- Description:
- TRANS PNP 50V 0.1A SC75 SOT416
- Quantity:
- Payment:
- Shipping:
Inventory:2,755
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Product details
Overview
2SA1774T1 from onsemi is a PNP silicon general-purpose amplifier transistor in SC−75/SOT−416 package, rated for −50 V V(BR)CEO, −100 mA IC, 150 mW PD, and 140 MHz fT. It delivers low VCE(sat) < 0.5 V at IC = −50 mA/IB = −5 mA and hFE = 120–560, suited for compact audio preamplifier stages and signal switching in portable consumer electronics.
For engineers reviewing the 2SA1774T1 datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP polarity, SC−75 thermal derating behavior, hFE consistency across −55°C to +150°C, and tape-and-reel compatibility with high-speed SMT placement systems.
Technical Context
This device operates as a medium-frequency, low-power PNP bipolar junction transistor optimized for linear amplification and active switching. Its design emphasizes stable DC current gain (hFE) over wide temperature range (−55°C to +150°C) and low saturation voltage under moderate drive conditions.
It uses standard epitaxial planar process technology with Pb-free, halogen-free packaging. The SC−75 footprint supports board space-constrained designs while maintaining sufficient thermal dissipation for continuous operation up to 150 mW at TA = 25°C with FR-4 mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V(BR)CEO | −50 V - Supports rail-to-rail operation in ≤−45 V supply circuits without breakdown |
| IC (max) | −100 mA - Enables driving small-signal loads like LED bias networks or relay coils |
| PD (max) | 150 mW - Requires thermal relief on PCB for sustained >100 mA pulsed operation |
| fT | 140 MHz - Suitable for RF preamp stages up to ~30 MHz fundamental frequency |
| hFE | 120–560 - Ensures predictable gain in Class-A amplifier configurations with minimal binning |
| VCE(sat) | < 0.5 V @ IC = −50 mA/IB = −5 mA - Reduces conduction loss in saturated-switch applications |
| COB | 3.5 pF - Limits Miller effect in high-gain common-emitter stages above 10 MHz |
Pinout & Package
2SA1774T1 is housed in SC−75 (SOT−416), a 3-pin surface-mount plastic package measuring 1.60 × 0.80 × 0.80 mm with 1.00 mm lead pitch. The package is optimized for automated assembly and thermal performance on FR-4 boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control electrode; requires ≥−5 mA drive for full saturation at −50 mA collector load |
| 2 | Emitter | Current source terminal; connected to higher potential in PNP configuration (e.g., VCC) |
| 3 | Collector | Output terminal; sinks current to load or ground; reverse-biased during cutoff |
Key Features
| Feature | Design Value |
|---|---|
| Low VCE(sat) | < 0.5 V enables efficient switching in battery-powered logic-level translators |
| Wide hFE range | 120–560 supports consistent biasing without external emitter degeneration in discrete gain blocks |
| High fT | 140 MHz allows use in IF amplifiers and oscillator buffer stages up to 30 MHz |
| Pb-free & RoHS | Compliant construction meets global environmental compliance requirements for consumer shipments |
| SC−75 footprint | 1.60 × 0.80 mm outline reduces PCB area by >60% vs. SOT-23 in space-critical wearables |
Applications
| Audio Preamp Stage | LED Constant-Current Bias |
|---|---|
Use Scenario: Low-noise voltage amplification in portable headphone drivers before DAC output filtering. IC Role / Device Role / Timing Role: PNP common-emitter amplifier providing 15–20 dB voltage gain with minimal THD. Use Value: Stable hFE across temperature ensures consistent gain calibration without trim resistors. | Use Scenario: Precision current sink for RGB LED backlight control in compact displays. IC Role / Device Role / Timing Role: Linear current regulator using emitter-follower configuration with feedback resistor. Use Value: Low VCE(sat) minimizes headroom loss, enabling full brightness at 2.8 V supply. |
| Signal Level Shifting | Low-Power Oscillator Buffer |
Use Scenario: Bidirectional logic-level translation between −3.3 V microcontroller I/O and −5 V sensor interface. IC Role / Device Role / Timing Role: Saturated switch toggling between cutoff and saturation states at ≤1 MHz. Use Value: Fast turn-on/off due to low COB and high fT maintains signal integrity in edge-sensitive protocols. | Use Scenario: Isolation buffer for Colpitts oscillator output feeding mixer input in sub-GHz ISM band receivers. IC Role / Device Role / Timing Role: Common-collector amplifier decoupling oscillator tank from load capacitance. Use Value: 140 MHz fT ensures flat gain response through 200 MHz, preserving phase noise performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP general-purpose amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 2SA1037AK-TL-E | Higher hFE (200–400), same SC−75 package, fT = 180 MHz, V(BR)CEO = −50 V | Better high-frequency linearity; slightly tighter hFE distribution | Select when designing for improved gain stability in RF front-end bias networks |
| BC807-40W | Different package (SOT-323), V(BR)CEO = −45 V, IC = −500 mA, hFE = 250–630 | Higher current capability but larger footprint and lower fT (100 MHz) | Choose for higher-current switching where board area permits and bandwidth ≤15 MHz suffices |
Compared with 2SA1774T1, 2SA1037AK-TL-E offers higher fT and tighter hFE spread for RF-sensitive biasing, while BC807-40W trades bandwidth for current headroom and uses a less space-efficient package-neither is pin-compatible, requiring layout revision.
Availability
2SA1774T1 is available at Aetrix Electronics and suitable for audio preamplifier stages, LED constant-current bias circuits, and low-power signal level shifting applications requiring stable component supply and RoHS-compliant sourcing.
Supply support for 2SA1774T1 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
onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The 2SA1774T1 belongs to onsemi's general-purpose bipolar transistor product line, engineered for cost-effective, space-constrained analog signal conditioning and switching in portable and battery-powered systems.
FAQ
What is the maximum operating temperature for the 2SA1774T1?
The 2SA1774T1 has a maximum junction temperature (TJ) of 150°C and a storage temperature range of −55°C to +150°C. Derating begins at TA > 25°C per the thermal resistance curve in the datasheet; at 70°C ambient, maximum power dissipation drops to ~90 mW. Always verify thermal performance in final PCB layout using the SC−75 thermal footprint guidelines provided by onsemi for the 2SA1774T1.
Is the 2SA1774T1 RoHS compliant and lead-free?
Yes, the 2SA1774T1 is RoHS compliant, Pb-free, and halogen-free/BFR-free as confirmed in the official onsemi datasheet (Rev. 11, November 2023). The "G" suffix in the ordering code (e.g., 2SA1774T1G) explicitly denotes Pb-free packaging, and the device meets JEDEC J-STD-609 Category 1a marking requirements. This applies directly to the 2SA1774T1 shipped in 3,000-unit tape-and-reel format.
What is the pin configuration of the 2SA1774T1 in SC−75 package?
The 2SA1774T1 uses SC−75 (SOT−416) package with pin 1 = Base, pin 2 = Emitter, pin 3 = Collector - confirmed in the mechanical case outline (Issue H, 01 FEB 2024) and marking diagram of the official datasheet. This pinout differs from SOT-23 and must be verified in layout files to prevent functional failure. The 2SA1774T1 pin assignment is fixed and not configurable.
Does the 2SA1774T1 meet AEC-Q101 reliability standards?
No - only the S-prefix variant (S2SA1774G) is AEC-Q101 qualified and PPAP capable, as stated in the Features section of the datasheet. The 2SA1774T1 is intended for industrial and consumer applications, not automotive. For automotive-grade replacement, specify S2SA1774G; the 2SA1774T1 does not carry AEC-Q101 certification or associated stress test documentation.
What is the typical transition frequency (fT) of the 2SA1774T1 and under what conditions is it measured?
The typical transition frequency (fT) of the 2SA1774T1 is 140 MHz, measured at VCE = −12 Vdc, IC = −2.0 mAdc, and f = 30 MHz per the Electrical Characteristics table. This value reflects small-signal AC current gain unity point and remains stable across −55°C to +150°C. Designers should reference Figure 7 (ftau vs. IC) in the datasheet to confirm usable bandwidth at target bias points for the 2SA1774T1.
2SA1774T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-75, SOT-416
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 5mA, 50mA
- Current - Collector Cutoff (Max):
- 500pA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 120 @ 1mA, 6V
- Power - Max:
- 150 mW
- Frequency - Transition:
- 140MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-75, SOT-416
2SA1774T1 FAQ
1.How can I place an order for 2SA1774T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 2SA1774T1 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 2SA1774T1 reliable?
The price and inventory of 2SA1774T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SA1774T1 is usually 5 days.
3.What payment methods are accepted for 2SA1774T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SA1774T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2SA1774T1?
2SA1774T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2SA1774T1 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 2SA1774T1?
For technical support, including 2SA1774T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SA1774T1 requirements.
6.How does Aetrix verify that 2SA1774T1 is sourced from the original manufacturer or authorized distributors?
All 2SA1774T1 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 2SA1774T1 meets industry standards.
7.What is the process for return or replacement of 2SA1774T1?
All 2SA1774T1 units undergo pre-shipment inspection (PSI). If there is an issue with 2SA1774T1, 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 2SA1774T1 part is unused and in its original packaging.
Return procedure for 2SA1774T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
2SA1774T1 Tags
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