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onsemi KSA1015YBU
- Part No.:
- KSA1015YBU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
KSA1015YBU.pdf
- Description:
- TRANS PNP 50V 0.15A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,473
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Product details
Overview
KSA1015YBU from onsemi is a PNP epitaxial silicon transistor designed for low-frequency amplifier and switching applications, with −50 V collector-base voltage (VCBO), −150 mA maximum collector current (IC), and hFE classification Y (120–240 at IC = −2 mA). It is commonly used in audio preamplifier stages and discrete logic-level signal inversion circuits.
For engineers reviewing the KSA1015YBU datasheet, pinout, applications, or equivalent options, key selection considerations include its TO-92 package compatibility, PNP polarity, saturation voltage performance (VCE(sat) ≤ −0.3 V at IC = −100 mA/IB = −10 mA), and hFE binning for gain-critical bias networks.
Technical Context
This device operates as a general-purpose PNP bipolar junction transistor with fixed-emitter configuration, optimized for linear amplification below 80 MHz (fT = 80 MHz) and DC switching. Its −5 V emitter-base breakdown (BVEBO) and −50 V collector-emitter rating (VCEO) define safe operating limits in negative-rail biasing topologies.
The thermal resistance (RJA = 312 °C/W) and 400 mW power dissipation (derated 3.2 mW/°C above 25 °C) indicate suitability for through-hole, low-power PCB layouts with minimal copper area-consistent with standard FR-4 boards sized 76 mm × 114 mm.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Device Type | PNP bipolar junction transistor (BJT), not MOSFET or FET |
| VCBO / VCEO | −50 V - supports rail-to-rail operation in −48 V or −24 V analog systems |
| IC(max) | −150 mA - enables drive of small relays, LED arrays, or base inputs of larger transistors |
| hFE (Y bin) | 120–240 at VCE = −6 V, IC = −2 mA - ensures predictable DC bias stability in Class-A amplifiers |
| VCE(sat) | ≤ −0.3 V at IC = −100 mA, IB = −10 mA - minimizes conduction loss in saturated-switch mode |
| fT | 80 MHz - sufficient for audio bandwidth and low-speed digital signal conditioning |
| Cob | 4–7 pF at VCB = −10 V - limits Miller effect in high-gain common-emitter stages |
Pinout & Package
Package: TO-92 (Case 135AR), lead-formed, 3-pin through-hole. Dimensions: 4.83 mm × 4.76 mm body, standardized for manual or wave-solder assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current source terminal for PNP operation | Connected to most positive supply node in common-emitter or common-base configurations |
| 2 (Collector) | Current sink terminal | Typically tied to load resistor or next-stage input; reverse-biased relative to emitter during active operation |
| 3 (Base) | Control electrode for minority-carrier injection | Receives negative-going drive signal; requires current-limiting resistor to prevent IB exceedance (−50 mA max) |
Key Features
| Feature | Design Value |
|---|---|
| Low-frequency amplifier grade | Optimized for <80 MHz operation with stable hFE across −2 mA to −150 mA collector range |
| Complementary pairing | Designed as direct counterpart to NPN KSC1815 - enables matched push-pull or differential pair implementation |
| RoHS-compliant construction | Pb-free, halogen-free/BFR-free packaging meets industrial environmental compliance requirements |
| TO-92 mechanical standardization | Interchangeable footprint with legacy PNP transistors (e.g., 2N3906, BC557) in manual prototyping and repair |
Applications
| Audio Preamp Stage | Discrete Logic Inverter |
|---|---|
Use Scenario: Low-noise voltage amplification in microphone preamplifier front-ends with single-negative supply. IC Role / Device Role / Timing Role: PNP BJT configured in common-emitter topology to provide inverted, gain-stable signal amplification. Use Value: 0.5–6 dB noise figure (NF) at 100 Hz and 0.1 mA bias enables clean signal capture without op-amp complexity. | Use Scenario: Level-shifting and signal inversion in TTL-to-discrete interface circuits with −5 V rails. IC Role / Device Role / Timing Role: Saturated switch providing logic-low output when base driven negative relative to emitter. Use Value: VCE(sat) ≤ −0.3 V ensures <0.3 V drop across collector load, preserving noise margin in multi-stage logic trees. |
| Current Mirror Reference | Relay Driver Interface |
Use Scenario: Precision current replication in analog sensor signal conditioning with matched transistor pairs. IC Role / Device Role / Timing Role: Active element in two-transistor current mirror where hFE matching (Y-bin 120–240) reduces ratio error. Use Value: Tight hFE classification enables <±5% current mismatch in mirrored branches at −2 mA bias. | Use Scenario: Driving 12 V/50 mA electromagnetic relay coils from microcontroller GPIO pins with open-collector output. IC Role / Device Role / Timing Role: High-side switch controlling relay coil return path to ground via emitter-follower or common-emitter configuration. Use Value: −150 mA IC rating and −50 V VCEO safely handle relay back-EMF spikes up to −40 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 2N3906 | Lower hFE range (100–300), same TO-92 package, −40 V VCEO rating | Less suitable for −50 V rail designs; acceptable in ≤−30 V systems with derated margin | Select KSA1015YBU when full −50 V breakdown and Y-bin hFE consistency are required |
| BC557B | hFE 200–450 (B-bin), −45 V VCEO, TO-92, higher Cob (8 pF typical) | Higher gain but reduced voltage margin and increased capacitive loading in RF-sensitive nodes | Prefer KSA1015YBU for designs needing guaranteed −50 V tolerance and lower output capacitance |
Compared with 2N3906 and BC557B, the KSA1015YBU provides superior voltage rating headroom and tighter hFE binning for precision biasing, while maintaining TO-92 interoperability-making it optimal for industrial −48 V signal chains and gain-critical analog stages.
Availability
KSA1015YBU is available at Aetrix Electronics and suitable for audio preamplifiers, discrete logic interfaces, and relay driver circuits requiring stable component supply and long-term obsolescence management.
Supply support for KSA1015YBU 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 specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The KSA1015YBU belongs to onsemi's general-purpose bipolar transistor product line, engineered for reliability in low-frequency analog signal processing and discrete switching applications where consistent gain, low noise, and robust voltage ratings are essential.
FAQ
What is the pin configuration of the KSA1015YBU?
The KSA1015YBU uses a TO-92 package with pin 1 as Emitter, pin 2 as Collector, and pin 3 as Base-verified per onsemi's marking diagram and mechanical outline CASE 135AR. This arrangement is consistent across all KSA1015 variants and matches standard PNP TO-92 orientation for breadboard and PCB layout.
Is the KSA1015YBU RoHS compliant?
Yes, the KSA1015YBU is RoHS compliant, Pb-free, and halogen-free/BFR-free as confirmed in the official onsemi datasheet revision 3 (November 2025). Compliance applies to both material content and manufacturing process, meeting EU Directive 2011/65/EU requirements.
What does the 'Y' suffix in KSA1015YBU indicate?
The 'Y' in KSA1015YBU denotes the hFE gain bin: 120–240 at VCE = −6 V and IC = −2 mA. This classification ensures predictable DC current gain for bias network design, distinguishing it from 'O' (70–140) and 'GR' (200–400) variants of the same KSA1015 family.
Can the KSA1015YBU replace the KSA1015GR in a circuit?
The KSA1015YBU can replace KSA1015GR only if the design tolerates lower hFE (120–240 vs. 200–400); otherwise, bias point shift or gain reduction may occur. Both share identical voltage/current ratings and TO-92 packaging, but GR-bin devices deliver higher minimum gain for critical amplifier stages.
What is the maximum power dissipation of the KSA1015YBU at 75°C ambient?
At 75°C ambient, the KSA1015YBU's maximum power dissipation is 240 mW: starting from 400 mW at 25°C and derating linearly at 3.2 mW/°C (50°C rise × 3.2 mW/°C = 160 mW reduction). This value assumes standard FR-4 PCB mounting per datasheet Note 2.
KSA1015YBU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 150 mA
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 10mA, 100mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 120 @ 2mA, 6V
- Power - Max:
- 400 mW
- Frequency - Transition:
- 80MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
KSA1015YBU FAQ
1.How can I place an order for KSA1015YBU through Aetrix?
Please submit a Request for Quotation (RFQ) for KSA1015YBU 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 KSA1015YBU reliable?
The price and inventory of KSA1015YBU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSA1015YBU is usually 5 days.
3.What payment methods are accepted for KSA1015YBU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSA1015YBU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSA1015YBU?
KSA1015YBU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSA1015YBU 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 KSA1015YBU?
For technical support, including KSA1015YBU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSA1015YBU requirements.
6.How does Aetrix verify that KSA1015YBU is sourced from the original manufacturer or authorized distributors?
All KSA1015YBU 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 KSA1015YBU meets industry standards.
7.What is the process for return or replacement of KSA1015YBU?
All KSA1015YBU units undergo pre-shipment inspection (PSI). If there is an issue with KSA1015YBU, 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 KSA1015YBU part is unused and in its original packaging.
Return procedure for KSA1015YBU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KSA1015YBU Tags
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