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

onsemi 2SA1179N6-CPA-TB-E

Name: 2SA1179N6-CPA-TB-E
Brand: onsemi
SKU: 2SA1179N6-CPA-TB-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SA1179N6-CPA-TB-E

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: 2SA1179N6-CPA-TB-E.pdf

Description:: TRANS PNP 50V 0.15A

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SA1179N6-CPA-TB-E from onsemi is a PNP bipolar junction transistor in CPA (SOT-23) package, rated for −50 V V_CEO, −150 mA I_C, and low −0.15 V typical V_CE(sat) at −50 mA/−5 mA drive, used in compact DC switching and signal amplification circuits in portable power management and interface stages.

For engineers reviewing the 2SA1179N6-CPA-TB-E datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed h_FE of 200–400 at −6 V/−10 mA, f_T of 180 MHz (typ), Cob of 3.0 pF, and Pb-free CPA packaging with 3,000 pcs./reel tape-and-reel delivery.

Technical Context

This PNP transistor operates with fixed-base bias or emitter-follower configurations, supporting linear amplification and saturated switching. Its −5 V V_EBO rating and −55 V V_CBO enable robust reverse-bias margin in negative-rail applications.

The device exhibits low saturation voltage (−0.15 V typ at −50 mA/−5 mA) and high current gain consistency across temperature (25°C to 75°C), making it suitable for battery-powered load control where conduction loss and thermal stability are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−50 V - Maximum collector-emitter blocking voltage under open-base conditions
I_C	−150 mA - Continuous DC collector current capability without derating at 25°C
V_CE(sat)	−0.15 V (typ) at −50 mA/−5 mA - Low conduction loss in saturated switch mode
h_FE	200–400 at −6 V/−10 mA - Guaranteed DC current gain range for bias design accuracy
f_T	180 MHz (typ) at −6 V/−10 mA - Usable for RF predriver or high-speed digital switching up to ~100 MHz
C_ob	3.0 pF at −6 V - Low output capacitance enabling fast turn-off and minimal Miller effect
P_C	200 mW - Power dissipation limit on standard FR-4 PCB (20×30×1.6 mm)

Pinout & Package

Package: CPA (JEITA SC-59 / JEDEC TO-236AB / SOT-23), surface-mount, 3-pin plastic case with 0.95 mm max height and 0.013 g mass.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal for forward-active and saturation biasing; requires current-limited drive
2	Emitter	Current source terminal in PNP operation; connected to higher potential rail in typical switch topology
3	Collector	Current sink terminal; connects to load and ground reference in common-emitter configuration

Key Features

Feature	Design Value
Low V_CE(sat)	−0.15 V typical enables <15 mW conduction loss at 50 mA, reducing thermal load in space-constrained layouts
High h_FE uniformity	Rank 6 binning (200–400) ensures predictable base drive requirements across production lots
Miniature CPA package	SOT-23 footprint supports high-density PCB assembly and automated pick-and-place with 3,000 pcs./reel tape-and-reel
High breakdown margin	V_CBO = −55 V provides 10% headroom above −50 V system rails, improving reliability in transient-prone environments

Applications

Portable LED Driver	Low-Voltage Level Shifter
Use Scenario: Driving white LEDs from 3.3 V or 5 V supply in wearables and handheld devices. IC Role / Device Role / Timing Role: PNP switch controlling cathode-side current path with low V_CE(sat) to maximize forward voltage headroom. Use Value: −0.15 V V_CE(sat) preserves >2.8 V across LED string at 50 mA, extending battery runtime vs. higher-saturation alternatives.	Use Scenario: Translating logic signals between −3.3 V and 0 V domains in mixed-supply microcontroller interfaces. IC Role / Device Role / Timing Role: Active pull-up stage converting open-drain outputs to negative-rail referenced CMOS-compatible levels. Use Value: 180 MHz f_T and 3.0 pF C_ob support clean edge transitions up to 20 MHz without added gate drive complexity.
Compact Load Switch	Audio Signal Amplifier
Use Scenario: Enabling/disabling 12 V or lower auxiliary rails in IoT sensor nodes using MCU GPIO. IC Role / Device Role / Timing Role: Saturated PNP switch placed between supply rail and load, controlled via base resistor network. Use Value: 200–400 h_FE allows direct GPIO drive (e.g., 3.3 V MCU) with simple 10 kΩ base resistor, eliminating need for driver IC.	Use Scenario: Low-noise preamplification of microphone or piezo sensor outputs in battery-powered audio recorders. IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier biased in linear region with stable h_FE over temperature. Use Value: Consistent 200–400 h_FE across −25°C to +75°C minimizes gain drift, reducing calibration burden in field-deployed units.

Portable LED Driver

Low-Voltage Level Shifter

Use Scenario: Driving white LEDs from 3.3 V or 5 V supply in wearables and handheld devices.

IC Role / Device Role / Timing Role: PNP switch controlling cathode-side current path with low V_CE(sat) to maximize forward voltage headroom.

Use Value: −0.15 V V_CE(sat) preserves >2.8 V across LED string at 50 mA, extending battery runtime vs. higher-saturation alternatives.

Use Scenario: Translating logic signals between −3.3 V and 0 V domains in mixed-supply microcontroller interfaces.

IC Role / Device Role / Timing Role: Active pull-up stage converting open-drain outputs to negative-rail referenced CMOS-compatible levels.

Use Value: 180 MHz f_T and 3.0 pF C_ob support clean edge transitions up to 20 MHz without added gate drive complexity.

Compact Load Switch

Audio Signal Amplifier

Use Scenario: Enabling/disabling 12 V or lower auxiliary rails in IoT sensor nodes using MCU GPIO.

IC Role / Device Role / Timing Role: Saturated PNP switch placed between supply rail and load, controlled via base resistor network.

Use Value: 200–400 h_FE allows direct GPIO drive (e.g., 3.3 V MCU) with simple 10 kΩ base resistor, eliminating need for driver IC.

Use Scenario: Low-noise preamplification of microphone or piezo sensor outputs in battery-powered audio recorders.

IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier biased in linear region with stable h_FE over temperature.

Use Value: Consistent 200–400 h_FE across −25°C to +75°C minimizes gain drift, reducing calibration burden in field-deployed units.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SA1037AK-TP	V_CEO = −50 V, I_C = −100 mA, h_FE = 120–270, f_T = 100 MHz	Lower current rating and gain range; not suitable for 150 mA loads or high-gain bias networks	Select when lower cost and reduced performance margin are acceptable in non-critical switching
BC807-40,215	V_CEO = −45 V, I_C = −500 mA, h_FE = 250–630, SOT-23 package	Higher I_C and wider h_FE range; requires layout review due to different saturation behavior and thermal profile	Prefer for higher-current loads but verify V_CE(sat) and thermal rise under actual operating conditions

Compared with 2SA1179N6-CPA-TB-E, the 2SA1037AK-TP offers lower cost but reduced current and gain margins, while the BC807-40,215 supports higher load currents but introduces variability in V_CE(sat) and thermal response that may affect long-term stability in precision bias designs.

Availability

2SA1179N6-CPA-TB-E is available at Aetrix Electronics and suitable for portable LED drivers, low-voltage level shifters, and compact load switches requiring stable component supply, RoHS-compliant packaging, and consistent parametric binning.

Supply support for 2SA1179N6-CPA-TB-E 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.

The 2SA1179N series belongs to onsemi's general-purpose bipolar transistor product line, designed for reliable DC switching and analog amplification in space-constrained, battery-operated systems.

FAQ

What is the maximum continuous collector current rating for the 2SA1179N6-CPA-TB-E?

The 2SA1179N6-CPA-TB-E has a maximum continuous collector current (I_C) rating of −150 mA at T_a = 25°C. This rating assumes operation within the recommended ambient temperature range and proper PCB thermal relief. Derating is required above 25°C per the PC–Ta curve in the datasheet, with full derating to zero at 150°C junction temperature.

Does the 2SA1179N6-CPA-TB-E have Pb-free packaging?

Yes, the 2SA1179N6-CPA-TB-E is Pb-free and RoHS-compliant, as confirmed by the "Pb Free" marking in the Ordering Information section of the official datasheet. The CPA package uses lead-free solderable terminations and conforms to J-STD-609 Category 1 requirements.

What is the guaranteed h_FE range for the 2SA1179N6-CPA-TB-E?

The 2SA1179N6-CPA-TB-E is binned to Rank 6, guaranteeing a DC current gain (h_FE) range of 200 to 400 when measured at V_CE = −6 V and I_C = −10 mA. This binning ensures predictable base drive requirements and simplifies bias network design across production volumes.

Can the 2SA1179N6-CPA-TB-E be used in RF applications?

The 2SA1179N6-CPA-TB-E has a typical f_T of 180 MHz at V_CE = −6 V and I_C = −10 mA, making it suitable for RF predriver, IF amplifier, or low-power oscillator applications up to approximately 100 MHz. Performance depends on proper impedance matching and layout; parasitic capacitance (C_ob = 3.0 pF) must be accounted for in high-frequency design.

What does the "TB" suffix indicate in 2SA1179N6-CPA-TB-E?

The "TB" suffix in 2SA1179N6-CPA-TB-E denotes embossed tape-and-reel packaging per JIS C 0806, with 3,000 units per reel. It specifies the packing type only and does not affect electrical characteristics; the "CPA" identifies the physical package (SOT-23), while "E" indicates Pb-free compliance.

2SA1179N6-CPA-TB-E Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

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

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

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 5mA, 50mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 1mA, 6V

Power - Max:: 200 mW

Frequency - Transition:: 180MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: -

2SA1179N6-CPA-TB-E FAQ

1.How can I place an order for 2SA1179N6-CPA-TB-E through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SA1179N6-CPA-TB-E 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 2SA1179N6-CPA-TB-E reliable?

The price and inventory of 2SA1179N6-CPA-TB-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SA1179N6-CPA-TB-E is usually 5 days.

3.What payment methods are accepted for 2SA1179N6-CPA-TB-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SA1179N6-CPA-TB-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SA1179N6-CPA-TB-E?

2SA1179N6-CPA-TB-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SA1179N6-CPA-TB-E 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 2SA1179N6-CPA-TB-E?

For technical support, including 2SA1179N6-CPA-TB-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SA1179N6-CPA-TB-E requirements.

6.How does Aetrix verify that 2SA1179N6-CPA-TB-E is sourced from the original manufacturer or authorized distributors?

All 2SA1179N6-CPA-TB-E 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 2SA1179N6-CPA-TB-E meets industry standards.

7.What is the process for return or replacement of 2SA1179N6-CPA-TB-E?

All 2SA1179N6-CPA-TB-E units undergo pre-shipment inspection (PSI). If there is an issue with 2SA1179N6-CPA-TB-E, 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 2SA1179N6-CPA-TB-E part is unused and in its original packaging.

Return procedure for 2SA1179N6-CPA-TB-E:

1.Submit a request within 90 days.

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

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