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onsemi KSB772YSTU
- Part No.:
- KSB772YSTU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-225AA, TO-126-3
- Datasheet:
-
KSB772YSTU.pdf
- Description:
- TRANS PNP 30V 3A TO-126-3
- Quantity:
- Payment:
- Shipping:
Inventory:3
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Product details
Overview
KSB772YSTU from onsemi (formerly Fairchild Semiconductor) is a PNP epitaxial silicon power transistor in TO-126 package, rated for -30 V VCEO, -3 A continuous collector current, and 10 W case-power dissipation at TC=25°C. It serves as an audio frequency power amplifier and low-speed switching device, commonly used in complementary push-pull output stages with its NPN counterpart KSD882.
For engineers reviewing the KSB772YSTU datasheet, pinout, applications, or equivalent options, key selection considerations include verified DC current gain (hFE = 160–400 at IC = -1 A), low VCE(sat) (-0.3 to -0.5 V at IC = -2 A / IB = -0.2 A), thermal resistance (RθJC = 13.5°C/W), and TO-126 mechanical compatibility in legacy linear amplifier designs.
Technical Context
This PNP bipolar junction transistor operates in linear amplification and saturated switching modes. Its hFE classification (Y-grade: 160–320 at IC = -1 A) and fT of 80 MHz support mid-bandwidth audio signal handling, while the -30 V VCEO rating enables use in ±15 V rail amplifier outputs.
The device features low saturation voltages (VCE(sat) ≤ -0.5 V, VBE(sat) ≤ -2.0 V) under high-current drive conditions and exhibits Cob = 55 pF at VCB = -10 V, limiting high-frequency switching suitability but supporting stable audio-stage operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -30 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration |
| IC (DC) | -3 A - Continuous collector current capability defining usable output power in Class-A/B amplifiers |
| hFE (IC = -1 A) | 160–320 - Confirmed DC current gain range for Y-grade, enabling predictable base drive sizing |
| VCE(sat) | -0.3 to -0.5 V - Low saturation voltage ensures minimal conduction loss and heat generation at 2 A load |
| RθJC | 13.5°C/W - Junction-to-case thermal resistance supports heatsink-based thermal management up to 10 W |
| fT | 80 MHz - Current gain bandwidth product suitable for audio band (<20 kHz) with margin |
| Cob | 55 pF - Output capacitance at -10 V VCB, limiting RF performance but stabilizing audio-stage feedback |
Pinout & Package
Package: TO-126 (standard through-hole power plastic package with integral heatsink tab; pin 2 is electrically connected to the collector and case).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current exit terminal; connects to ground or negative rail in common-emitter amplifier configurations |
| 2 | Collector | Main current input terminal; electrically tied to metal tab for direct heatsink mounting and thermal path |
| 3 | Base | Control terminal; requires negative bias relative to emitter to turn on PNP device |
Key Features
| Feature | Design Value |
|---|---|
| Complementary Pairing | Designed as direct PNP complement to KSD882 NPN transistor for matched push-pull output stages |
| High hFE Consistency | Y-grade bin guarantees hFE ≥160 at IC = -1 A, reducing base drive variability across production units |
| Low Saturation Loss | VCE(sat) ≤ -0.5 V at IC = -2 A ensures <1 W conduction loss per device in Class-AB output stage |
| Thermally Robust Package | TO-126 case enables >10 W dissipation with external heatsink, validated by RθJC = 13.5°C/W |
Applications
| Audio Power Amplifier | DC Motor Driver (Low-Speed) |
|---|---|
Use Scenario: Complementary output stage in discrete hi-fi amplifier delivering 10–20 W into 4–8 Ω loads. IC Role / Device Role / Timing Role: PNP power switch in Class-AB topology, sourcing current to load during negative half-cycle. Use Value: Matched hFE and VCE(sat) with KSD882 minimizes crossover distortion and thermal imbalance. | Use Scenario: H-bridge half-bridge leg driving 12 V/2 A brushed DC motor in industrial actuator. IC Role / Device Role / Timing Role: High-side PNP switch controlling motor voltage rail with base-driven on/off control. Use Value: -3 A IC rating and -30 V VCEO accommodate back-EMF spikes and supply transients. |
| Linear Voltage Regulator Pass Element | Discrete Power Supply Control |
Use Scenario: Series pass transistor in adjustable linear regulator supplying ±15 V rails for op-amp circuits. IC Role / Device Role / Timing Role: PNP series regulator element operating in active region to maintain constant output voltage. Use Value: 10 W PC rating and low VCE(sat) enable stable regulation under 1 A load with minimal dropout. | Use Scenario: Enable/disable control of auxiliary 5 V/3 A power domain in legacy embedded system. IC Role / Device Role / Timing Role: Low-speed switching transistor acting as power gate between source and downstream circuitry. Use Value: Verified ICP = -7 A pulse rating supports inrush current handling during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD772T4G | TO-252 (DPAK) surface-mount package; identical VCEO/IC/hFE specs; RθJA = 62°C/W (vs. 132°C/W for KSB772YSTU) | Requires PCB rework for SMT assembly; better suited for automated production than through-hole | Select when migrating to surface-mount design and thermal management permits lower RθJA |
| BD711 | TO-126 package; VCEO = -100 V, IC = -3 A, hFE = 25–250; higher voltage rating but wider hFE spread | Supports higher-voltage rails (e.g., ±48 V telecom); less consistent gain in linear amplifiers | Select when extended breakdown margin is required and gain matching is secondary |
Compared with MJD772T4G and BD711, the KSB772YSTU offers tighter hFE binning (Y-grade) and proven thermal performance in TO-126 for audio amplifier output stages, though it is discontinued and not recommended for new designs.
Availability
KSB772YSTU is available at Aetrix Electronics and suitable for audio power amplifiers, linear voltage regulators, DC motor drivers, and discrete power supply control requiring stable component supply despite end-of-life status.
Supply support for KSB772YSTU 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 semiconductor supplier specializing in energy-efficient power and sensing solutions for automotive, industrial, cloud, and consumer markets.
The KSB772YSTU belongs to onsemi's legacy discrete power transistor family, designed specifically for audio frequency linear amplification and low-speed switching in industrial and consumer analog systems.
FAQ
What is the pin configuration of the KSB772YSTU?
The KSB772YSTU uses a TO-126 package with three terminals: Pin 1 is Emitter, Pin 2 is Collector (electrically connected to the metal tab), and Pin 3 is Base. This configuration is standardized across all KSB772 variants and confirmed in the official onsemi datasheet Rev. 3 (July 2025). The collector-tab connection enables direct heatsinking, critical for thermal management in power amplifier applications using the KSB772YSTU.
Is the KSB772YSTU still in active production?
No, the KSB772YSTU is discontinued and explicitly marked "NOT RECOMMENDED FOR NEW DESIGN" in the official onsemi documentation. While limited legacy stock may be available through authorized distributors like Aetrix Electronics, no new manufacturing runs are planned. Customers designing new products should consult onsemi for approved replacements such as the MJD772T4G or consider redesigning with modern alternatives before committing to KSB772YSTU in long-term BOMs.
What does the 'Y' suffix in KSB772YSTU indicate?
The 'Y' in KSB772YSTU denotes the hFE gain bin: 160–320 at VCE = -2 V and IC = -1 A. This grading ensures tighter DC current gain consistency compared to R (60–120), O (100–200), or G (200–400) bins. The full part number KSB772YSTU therefore specifies a Y-grade device in TO-126 package with standard terminal lengths (TSSTU), making it suitable for applications where predictable base drive requirements are critical - such as matched complementary amplifier stages using the KSB772YSTU and KSD882.
Can the KSB772YSTU replace the KSB772 without changes?
Yes, KSB772YSTU is a direct variant of the base KSB772, sharing identical electrical specifications, TO-126 package, pinout, and thermal characteristics. The 'STU' suffix indicates standard terminal length per onsemi's MKT-TO126AArev2 drawing, and 'Y' confirms the hFE bin. No PCB or schematic modifications are needed when substituting KSB772YSTU for generic KSB772, provided the same gain grade is acceptable. All documented parameters for KSB772 apply fully to KSB772YSTU.
What is the maximum safe operating temperature for the KSB772YSTU?
The KSB772YSTU has a maximum junction temperature (TJ) of 150°C and storage temperature range of -55°C to +150°C. Safe continuous operation requires maintaining TJ ≤ 150°C via appropriate heatsinking - achievable with its RθJC = 13.5°C/W and 10 W PC rating at TC = 25°C. Derating begins above 25°C case temperature, reaching zero dissipation at ~175°C per the published derating curve. Thermal design for KSB772YSTU must account for ambient, airflow, and heatsink interface resistance to avoid exceeding this limit.
KSB772YSTU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-225AA, TO-126-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
KSB772YSTU FAQ
1.How can I place an order for KSB772YSTU through Aetrix?
Please submit a Request for Quotation (RFQ) for KSB772YSTU 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 KSB772YSTU reliable?
The price and inventory of KSB772YSTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSB772YSTU is usually 5 days.
3.What payment methods are accepted for KSB772YSTU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSB772YSTU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSB772YSTU?
KSB772YSTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSB772YSTU 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 KSB772YSTU?
For technical support, including KSB772YSTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSB772YSTU requirements.
6.How does Aetrix verify that KSB772YSTU is sourced from the original manufacturer or authorized distributors?
All KSB772YSTU 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 KSB772YSTU meets industry standards.
7.What is the process for return or replacement of KSB772YSTU?
All KSB772YSTU units undergo pre-shipment inspection (PSI). If there is an issue with KSB772YSTU, 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 KSB772YSTU part is unused and in its original packaging.
Return procedure for KSB772YSTU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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