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onsemi KSB772YS
- Part No.:
- KSB772YS
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-225AA, TO-126-3
- Datasheet:
-
KSB772YS.pdf
- Description:
- TRANS PNP 30V 3A TO-126-3
- Quantity:
- Payment:
- Shipping:
Inventory:45,723
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Product details
Overview
KSB772YS from onsemi is a PNP epitaxial silicon power transistor in TO-126 package, rated for -30 V VCEO, -3 A continuous collector current, and 10 W collector dissipation at TC=25°C. It delivers hFE of 60–400 (class Y/G), VCE(sat) ≤ -0.5 V at IC = -2 A/IB = -0.2 A, and fT = 80 MHz - used in audio frequency power amplification and low-speed switching circuits.
For engineers reviewing the KSB772YS datasheet, pinout, applications, or equivalent options, key selection considerations include its PNP polarity, TO-126 thermal performance (RθJC = 13.5°C/W), safe operating area limits, saturation voltage trade-offs at high IC, and discontinuation status requiring legacy design support planning.
Technical Context
This device operates as a medium-power PNP bipolar junction transistor with DC current gain spanning two classifications (Y: 160–320; G: 200–400) depending on hFE2 binning. Its safe operating area is defined by both dissipation and secondary breakdown limits, with pulse capability up to -7 A (10 ms, 50% duty cycle).
Thermal design relies on case-mounted heatsinking due to RθJC = 13.5°C/W and RθJA = 132°C/W. The TO-126 package features emitter-collector-base pinout (1–2–3), supporting complementary use with NPN KSD882 in push-pull amplifier stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -30 V - maximum sustainable collector-emitter voltage before breakdown in common-emitter configuration |
| IC (DC) | -3 A - continuous collector current rating defining steady-state power handling capacity |
| PC (TC=25°C) | 10 W - maximum power dissipation achievable with adequate case heatsinking |
| hFE2 | 160–400 - DC current gain at IC = -1 A, critical for base drive sizing in linear/switching modes |
| VCE(sat) | ≤ -0.5 V @ IC = -2 A / IB = -0.2 A - low saturation voltage enabling efficient switching with minimal conduction loss |
| fT | 80 MHz - transition frequency limiting usable bandwidth in RF or high-speed switching applications |
| RθJC | 13.5°C/W - junction-to-case thermal resistance guiding heatsink selection for thermal management |
Pinout & Package
Package: TO-126 molded plastic power package with metal tab for heatsink mounting; dimensions per MKT-TO126AArev2 drawing; no industry standard applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current sink terminal; connected to most negative potential in PNP operation; electrically tied to metal tab in standard mounting |
| 2 | Collector | Main current-carrying terminal; attached to metal tab for thermal path; requires isolation when mounted to heatsink |
| 3 | Base | Control input; forward-biased to turn on transistor; requires current-limiting resistor in driver stage |
Key Features
| Feature | Design Value |
|---|---|
| Complementary Pairing | Designed as PNP counterpart to NPN KSD882 for balanced push-pull audio output stages |
| High hFE Binning | Y/G classification enables precise base drive optimization across production lots |
| Pulse Current Capability | Supports -7 A pulses (≤10 ms, ≤50% duty) for transient load handling in power amplifiers |
| Low VCE(sat) | Ensures <0.5 V conduction loss at 2 A, reducing heat generation in Class AB amplifier bias networks |
Applications
| Audio Power Amplifier Output Stage | DC Motor Driver (Low-Speed) |
|---|---|
Use Scenario: Final output stage in 10–20 W stereo audio amplifiers driving 4–8 Ω speakers. IC Role / Device Role / Timing Role: PNP power switch in complementary emitter-follower configuration with KSD882. Use Value: Delivers linear gain (hFE ≥160) and low VCE(sat) to minimize crossover distortion and thermal stress at full output. | Use Scenario: H-bridge half-bridge leg controlling bidirectional 12 V DC motors in industrial actuators. IC Role / Device Role / Timing Role: Low-speed PNP switch enabling current sinking during reverse motor drive phase. Use Value: Handles -3 A continuous and -7 A pulsed loads while maintaining safe SOA under inductive kickback conditions. |
| Linear Voltage Regulator Pass Element | Relay Driver Interface |
Use Scenario: Series pass transistor in adjustable 3–15 V, 1–2 A linear regulators for analog subsystems. IC Role / Device Role / Timing Role: PNP-controlled current source regulating output voltage via feedback loop. Use Value: Stable hFE and low VBE(sat) (-1.0 to -2.0 V) enable predictable base current requirements and thermal predictability. | Use Scenario: Driving 24 V, 100 mA coil relays in PLC I/O modules with optocoupler-isolated control. IC Role / Device Role / Timing Role: Saturated PNP switch interfacing microcontroller GPIO to relay coil ground path. Use Value: Fast turn-off (fT = 80 MHz) and robust VEBO = -5 V rating prevent false triggering from EMI transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD772 | TO-252 (DPAK) package; same VCEO/IC/hFE specs; RθJC = 5°C/W (superior thermal performance) | Surface-mount compatible; higher power density; unsuitable for through-hole legacy boards | Select MJD772 for new SMT designs requiring improved thermal efficiency and smaller footprint |
| BD772 | TO-126 package; identical pinout; VCEO = -40 V (higher); hFE = 25–250 (lower min/max range) | Direct physical replacement; wider voltage margin but reduced gain consistency at high IC | Choose BD772 for drop-in replacement where enhanced voltage headroom is prioritized over hFE stability |
Compared with KSB772YS, MJD772 offers better thermal resistance in SMT format but requires PCB redesign, while BD772 provides mechanical and electrical compatibility in TO-126 with higher VCEO at the cost of narrower hFE range - both serve distinct legacy modernization paths.
Availability
KSB772YS is available at Aetrix Electronics and suitable for audio amplifier repair, industrial relay interface refurbishment, and DC motor controller maintenance requiring stable component supply for discontinued semiconductor support.
Supply support for KSB772YS 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 Fairchild Semiconductor) is a global leader in intelligent power and sensing technologies, serving automotive, industrial, cloud, and IoT markets with energy-efficient silicon solutions.
The KSB772YS belongs to onsemi's legacy bipolar power transistor product line, engineered for audio frequency amplification and rugged low-speed switching in industrial control and consumer electronics.
FAQ
Is KSB772YS still in active production?
No, KSB772YS is discontinued and not recommended for new designs per onsemi documentation. However, Aetrix Electronics maintains verified legacy stock with full traceability for repair, maintenance, and end-of-life program support. Each KSB772YS unit supplied undergoes electrical verification to ensure compliance with original Rev. 3 specifications before shipment.
What is the pinout configuration of KSB772YS?
KSB772YS uses a TO-126 package with standardized emitter-collector-base pinout: Pin 1 = Emitter, Pin 2 = Collector (connected to metal tab), Pin 3 = Base. This matches JEDEC TO-126 mechanical outline and ensures mechanical compatibility with sockets and heatsinks designed for this footprint. Always verify tab isolation when mounting KSB772YS to avoid short circuits.
Can KSB772YS be used as a direct replacement for KSB772?
Yes, KSB772YS is a factory-binned variant of KSB772 with guaranteed hFE classification (Y or G), meaning it meets or exceeds all electrical and mechanical specifications of the base KSB772. All absolute maximum ratings, thermal parameters, and pinout are identical - KSB772YS is fully interchangeable with KSB772 in existing designs without modification.
What is the maximum safe operating collector current for KSB772YS at 75°C case temperature?
At TC = 75°C, KSB772YS derates linearly from 10 W at 25°C using RθJC = 13.5°C/W. Maximum allowable power is 6.6 W, supporting ~2.2 A continuous collector current (assuming VCE(sat) ≈ -0.4 V). Exceeding this requires verifying SOA curves from Figure 6 in the datasheet to avoid secondary breakdown during transient loads.
Does KSB772YS have avalanche rating or ruggedness specification?
No official avalanche energy (EAS) or ruggedness rating is published for KSB772YS in its datasheet. The device is characterized for safe operating area under resistive and inductive loads per Figure 6, but lacks explicit UIS (unclamped inductive switching) validation. For inductive switching applications, external clamping (e.g., flyback diode + RC snubber) is mandatory to protect KSB772YS from voltage overshoot beyond -30 V VCEO.
KSB772YS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-225AA, TO-126-3
- Packaging:
- Bulk
- Product Status:
- Last Time Buy
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 3 A
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 200mA, 2A
- Current - Collector Cutoff (Max):
- 1µA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 160 @ 1A, 2V
- Power - Max:
- 1 W
- Frequency - Transition:
- 80MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-126-3
KSB772YS FAQ
1.How can I place an order for KSB772YS through Aetrix?
Please submit a Request for Quotation (RFQ) for KSB772YS 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 KSB772YS reliable?
The price and inventory of KSB772YS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSB772YS is usually 5 days.
3.What payment methods are accepted for KSB772YS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSB772YS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSB772YS?
KSB772YS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSB772YS 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 KSB772YS?
For technical support, including KSB772YS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSB772YS requirements.
6.How does Aetrix verify that KSB772YS is sourced from the original manufacturer or authorized distributors?
All KSB772YS 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 KSB772YS meets industry standards.
7.What is the process for return or replacement of KSB772YS?
All KSB772YS units undergo pre-shipment inspection (PSI). If there is an issue with KSB772YS, 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 KSB772YS part is unused and in its original packaging.
Return procedure for KSB772YS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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