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onsemi FJAF4310OTU
- Part No.:
- FJAF4310OTU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-3P-3 Full Pack
- Datasheet:
-
FJAF4310OTU.pdf
- Description:
- TRANS NPN 140V 10A TO-3PF
- Quantity:
- Payment:
- Shipping:
Inventory:9,966
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Product details
Overview
FJAF4310OTU from ON Semiconductor is an NPN epitaxial silicon power transistor designed for audio power amplifier stages, featuring 140 V VCEO, 10 A DC collector current, 80 W collector dissipation at TC=25°C, and a 30 MHz fT. It operates in Class AB amplifier output stages requiring high safe operating area (SOA) and robust thermal performance.
For engineers reviewing the FJAF4310OTU datasheet, pinout, applications, or equivalent options, key selection criteria include VCEO/VCBO rating, hFE classification bands (R/O/Y), SOA curve validation, TO-3PF package thermal resistance (RθJC = 1.48°C/W), and complementary pairing with FJAF4210.
Technical Context
This device is a discrete high-power bipolar junction transistor optimized for linear audio amplification. Its wide forward-bias SOA supports sustained operation under reactive loads, while its 1.48°C/W junction-to-case thermal resistance enables effective heatsinking in TO-3PF metal packages.
The FJAF4310OTU delivers hFE of 50–180 (depending on classification grade), VCE(sat) ≤ 0.5 V at IC=5 A/IB=0.5 A, and Cob = 250 pF at VCB=10 V - parameters critical for stability, gain linearity, and switching behavior in push-pull output stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 140 V - Maximum collector-emitter voltage before breakdown; defines usable rail voltage headroom in audio output stages. |
| IC (DC) | 10 A - Continuous collector current capability; supports high-power speaker drive without derating at TC ≤ 25°C. |
| PC | 80 W - Collector power dissipation at TC=25°C; determines heatsink sizing and thermal design margin. |
| fT | 30 MHz - Current gain bandwidth product; ensures adequate small-signal gain at audio frequencies up to 20 kHz with margin. |
| RθJC | 1.48 °C/W - Junction-to-case thermal resistance; enables direct thermal path to heatsink via metal tab (Pin 2). |
| hFE | 50–180 - DC current gain range across R/O/Y classifications; impacts base drive requirements and bias stability. |
| VCE(sat) | ≤ 0.5 V at IC=5 A/IB=0.5 A - Low saturation voltage reduces conduction loss and improves efficiency in Class AB operation. |
Pinout & Package
Package: TO-3PF (JEITA SC94 compliant), metal-can with insulated base, 3-terminal configuration. Pin 2 (Collector) connects directly to the internal die attach pad (DAP) for low-inductance, low-resistance thermal and electrical path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal for bipolar current amplification; requires current-limited drive due to IB(max) = 1.5 A. |
| 2 | Collector | Main power terminal tied to DAP; serves as primary thermal and electrical interface to heatsink. |
| 3 | Emitter | Output reference node; carries full load current and establishes emitter-follower or common-emitter topology. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Forward-Bias SOA | Supports sustained operation into reactive speaker loads without secondary breakdown, verified per Figure 6. |
| High IC Capability | 10 A DC rating enables use in >100 W audio amplifier outputs without parallel devices. |
| Complementary Pairing | Designed as NPN counterpart to FJAF4210 (PNP), enabling matched push-pull stage implementation. |
| TO-3PF Thermal Performance | 1.48°C/W RθJC allows efficient heat transfer to external heatsink via metal case contact. |
Applications
| Hi-Fi Audio Amplifier Output Stage | Professional PA System Power Module |
|---|---|
Use Scenario: Final output stage in discrete Class AB stereo amplifier delivering 50–150 W per channel into 4–8 Ω speakers. IC Role / Device Role / Timing Role: NPN power switch amplifying line-level input to speaker-level output; operates in linear region with precise bias control. Use Value: High SOA and 140 V VCEO prevent clipping-induced breakdown during dynamic transients and reactive load swings. | Use Scenario: Dual-rail power output section in 300–600 W professional loudspeaker management systems. IC Role / Device Role / Timing Role: High-current output transistor in paralleled or multi-stage output banks driving low-Z horn-loaded cabinets. Use Value: 10 A IC and 80 W PC support continuous RMS power delivery without thermal runaway under long-duration program material. |
| Studio Monitor Power Amplifier | Industrial Audio Signal Distribution |
Use Scenario: Precision near-field monitor amplifier requiring low distortion, wide bandwidth, and stable quiescent current. IC Role / Device Role / Timing Role: Linear gain element in feedback-controlled output stage; biased for minimal crossover distortion. Use Value: 30 MHz fT and tight hFE classification (R/O/Y) enable consistent open-loop gain and predictable compensation behavior. | Use Scenario: Centralized audio distribution amplifier feeding multiple zones in commercial buildings or broadcast infrastructure. IC Role / Device Role / Timing Role: Robust output driver handling extended duty cycles, ambient temperature variations, and EMI-prone environments. Use Value: -55°C to +150°C TSTG/TJ rating and 200 V VCBO ensure reliability in uncontrolled mechanical rooms or outdoor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJE15030G | VCEO = 150 V, IC = 8 A, PC = 75 W, TO-247 package, no integrated DAP connection. | Higher voltage margin but lower current and power; requires separate emitter star grounding for stability. | Preferred where higher VCEO is prioritized over current density and thermal coupling efficiency. |
| 2SC5200 | VCEO = 230 V, IC = 15 A, PC = 150 W, TO-3P package, wider hFE spread (55–160). | Higher power handling and voltage rating; broader hFE tolerance increases bias calibration effort. | Chosen when system-level power scaling exceeds 150 W/channel and SOA must accommodate extreme transient peaks. |
Compared with MJE15030G and 2SC5200, the FJAF4310OTU offers optimal balance of 140 V/10 A rating, 1.48°C/W thermal resistance, and JEITA SC94-compliant TO-3PF packaging - making it especially suited for compact, thermally constrained Hi-Fi and pro-audio designs where DAP-coupled collector routing is advantageous.
Availability
FJAF4310OTU is available at Aetrix Electronics and suitable for Hi-Fi audio amplifier output stages, professional PA system power modules, and studio monitor power amplifiers requiring stable component supply and long-term industrial availability.
Supply support for FJAF4310OTU 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and logic solutions for automotive, industrial, cloud, and consumer markets.
The FJAF4310OTU belongs to ON Semiconductor's legacy Fairchild discrete power transistor portfolio, engineered specifically for high-fidelity linear audio amplification and high-current analog output applications.
FAQ
What is the maximum collector-emitter voltage rating for FJAF4310OTU?
The FJAF4310OTU has a guaranteed minimum VCEO rating of 140 V at IC = 50 mA with infinite base-emitter resistance. This rating defines the absolute upper limit for DC or peak collector-emitter voltage in linear operation and must be respected to avoid avalanche breakdown. Derating is required above TA = 25°C per the datasheet's power derating curve.
Does FJAF4310OTU have a built-in thermal shutdown feature?
No, the FJAF4310OTU is a discrete bipolar transistor without integrated thermal protection circuitry. Safe operation depends entirely on external thermal design - including heatsink sizing, mounting pressure, thermal interface material, and ambient airflow - to maintain junction temperature below 150°C. The RθJC = 1.48°C/W value must be used with measured case temperature to estimate TJ.
How is the FJAF4310OTU pinout configured in the TO-3PF package?
The FJAF4310OTU uses a standard TO-3PF pinout: Pin 1 is Base, Pin 2 is Collector (internally connected to the DAP/heatsink tab), and Pin 3 is Emitter. This configuration enables low-inductance collector routing and direct thermal coupling to the heatsink. Mounting orientation must ensure electrical isolation between Pin 2 and chassis unless intentional grounding is part of the design.
Can FJAF4310OTU be used as a direct replacement for FJAF4310?
Yes, FJAF4310OTU is the updated ON Semiconductor nomenclature for the original Fairchild FJAF4310, resulting from the underscore-to-dash naming convention change post-acquisition. Electrical specifications, package dimensions, pinout, and thermal characteristics are identical; only the orderable part number differs. Designers may use FJAF4310OTU interchangeably with FJAF4310 in existing PCB layouts and BOMs.
What hFE classification grades are available for FJAF4310OTU?
The FJAF4310OTU is offered in three hFE classification grades: R (50–100), O (70–140), and Y (90–180), all tested at VCE = 4 V and IC = 3 A. Grade selection affects base drive requirements and bias point stability - Y-grade parts allow lower base current for same collector current but require tighter matching when paralleling devices. Datasheet Rev. B0 confirms these ranges and test conditions.
FJAF4310OTU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-3P-3 Full Pack
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 10 A
- Voltage - Collector Emitter Breakdown (Max):
- 140 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 500mA, 5A
- Current - Collector Cutoff (Max):
- 10µA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 70 @ 3A, 4V
- Power - Max:
- 80 W
- Frequency - Transition:
- 30MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-3PF
FJAF4310OTU FAQ
1.How can I place an order for FJAF4310OTU through Aetrix?
Please submit a Request for Quotation (RFQ) for FJAF4310OTU 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 FJAF4310OTU reliable?
The price and inventory of FJAF4310OTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FJAF4310OTU is usually 5 days.
3.What payment methods are accepted for FJAF4310OTU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FJAF4310OTU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FJAF4310OTU?
FJAF4310OTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FJAF4310OTU 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 FJAF4310OTU?
For technical support, including FJAF4310OTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FJAF4310OTU requirements.
6.How does Aetrix verify that FJAF4310OTU is sourced from the original manufacturer or authorized distributors?
All FJAF4310OTU 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 FJAF4310OTU meets industry standards.
7.What is the process for return or replacement of FJAF4310OTU?
All FJAF4310OTU units undergo pre-shipment inspection (PSI). If there is an issue with FJAF4310OTU, 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 FJAF4310OTU part is unused and in its original packaging.
Return procedure for FJAF4310OTU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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