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onsemi FJA4310OTU
- Part No.:
- FJA4310OTU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-3P-3, SC-65-3
- Datasheet:
-
FJA4310OTU.pdf
- Description:
- TRANS NPN 140V 10A TO-3P
- Quantity:
- Payment:
- Shipping:
Inventory:213
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Product details
Overview
FJA4310OTU from ON Semiconductor is an NPN epitaxial silicon power transistor designed for high-current audio amplifier output stages, featuring 140 V VCEO, 10 A DC collector current, 100 W power dissipation at TC = 25°C, and a 30 MHz fT. It operates in linear mode with wide SOA and complements the FJA4210 PNP device.
For engineers reviewing the FJA4310OTU datasheet, pinout, applications, or equivalent options, key selection criteria include safe operating area under pulse conditions, hFE classification (R/O/Y), VCE(sat) at 5 A/0.5 A drive, thermal derating above 25°C, and TO-3P mechanical compatibility with heatsink mounting requirements.
Technical Context
The FJA4310OTU is a discrete bipolar junction transistor optimized for Class AB audio power amplification. Its 140 V VCEO rating supports rail voltages up to ±70 V, while its 10 A IC and 100 W PC enable robust output stage operation under sustained load.
It exhibits a minimum hFE of 50 at VCE = 4 V and IC = 3 A, with VCE(sat) ≤ 0.5 V at IC = 5 A and IB = 0.5 A. The 250 pF Cob and 30 MHz fT support mid-to-high audio frequency fidelity without excessive phase shift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 140 V - Supports ±70 V supply rails in push-pull audio output stages without breakdown. |
| IC (DC) | 10 A - Delivers high continuous output current for 50–100 W audio amplifiers. |
| PC @ TC=25°C | 100 W - Requires thermally efficient TO-3P mounting and heatsinking for stable operation. |
| hFE (min) | 50 @ VCE=4 V, IC=3 A - Ensures sufficient base drive efficiency in linear amplifier bias networks. |
| VCE(sat) | ≤0.5 V @ IC=5 A, IB=0.5 A - Minimizes conduction loss and thermal stress in output stage. |
| fT | 30 MHz - Maintains gain and linearity across full audio band (20 Hz–20 kHz) with margin. |
| Cob | 250 pF @ VCB=10 V, f=1 MHz - Limits high-frequency instability risk in feedback-compensated designs. |
Pinout & Package
Package: TO-3P (EIAJ SC-65 standard), metal-can package with isolated collector tab, designed for direct heatsink mounting and high-power thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control input terminal | Receives base current to modulate collector current; requires low-impedance driver for fast switching in Class AB. |
| 2 (Collector) | Main current output terminal | Electrically connected to metal case; must be insulated from heatsink unless system ground reference permits. |
| 3 (Emitter) | Current return path | Serves as common reference for emitter-follower or grounded-emitter configurations; carries full load current. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Forward Bias Safe Operating Area (SOA) | Supports pulsed 10 A loads at 100 V without secondary breakdown-critical for dynamic audio peaks. |
| High Power Dissipation (100 W) | Enables use in high-output analog amplifiers without forced-air cooling when properly heatsinked. |
| Complementary Pairing | Designed as NPN counterpart to FJA4210 (PNP), enabling matched push-pull output stages with balanced thermal behavior. |
| hFE Classification (R/O/Y) | Three gain bins (50–100 / 70–140 / 90–180) allow precision matching in differential or paralleled amplifier designs. |
Applications
| Hi-Fi Audio Amplifier Output Stage | Professional PA System Driver |
|---|---|
|
Use Scenario: Final output stage in discrete Class AB amplifier delivering 50–100 W into 4–8 Ω loads with low THD. IC Role / Device Role / Timing Role: NPN power switch controlling current flow from positive rail to speaker load; operated in linear region. Use Value: 140 V VCEO and wide SOA prevent clipping-induced failure during transient peaks; 0.5 V VCE(sat) reduces heat generation at rated output. |
Use Scenario: High-reliability driver in 200–500 W professional loudspeaker cabinets requiring long-term thermal stability. IC Role / Device Role / Timing Role: Linear power transistor in complementary pair configuration driving reactive speaker loads with high crest factor. Use Value: 100 W power rating and TO-3P thermal interface enable continuous operation at 70% RMS power without thermal runaway. |
| Studio Monitor Power Module | Discrete Guitar Amplifier Output |
|
Use Scenario: Precision near-field monitor amplifier demanding tight gain matching and low noise floor. IC Role / Device Role / Timing Role: High-fidelity output device biased in Class AB with emitter degeneration for linearity control. Use Value: 30 MHz fT and 250 pF Cob preserve transient response and phase coherence up to 100 kHz, supporting ultrasonic feedback stability. |
Use Scenario: Output stage in tube-hybrid or all-solid-state guitar amplifiers requiring harmonic richness and soft clipping behavior. IC Role / Device Role / Timing Role: Linear power transistor operated with intentional asymmetry to generate even-order harmonics during overdrive. Use Value: Wide SOA allows controlled saturation during signal peaks without latch-up, contributing to musical distortion characteristics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN audio power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJE15030G | Lower VCEO (120 V), same IC (10 A), lower fT (15 MHz), TO-247 package | Less suitable for ±70 V rail systems; requires different heatsink footprint | Select when cost sensitivity outweighs voltage headroom needs and PCB layout allows TO-247 rework. |
| 2SC5200 | Higher VCEO (230 V), same IC (15 A), higher fT (30 MHz), TO-3P package | Over-specified voltage rating increases cost; higher hFE may require bias network adjustment | Choose when extended voltage margin or legacy design compatibility with Toshiba-based circuits is required. |
Compared with MJE15030G and 2SC5200, the FJA4310OTU offers optimal balance of voltage rating, thermal performance in TO-3P, and hFE binning for matched pair assembly-making it preferred for new-design high-fidelity audio output stages where ±70 V rails and SOA integrity are critical.
Availability
FJA4310OTU is available at Aetrix Electronics and suitable for Hi-Fi audio amplifiers, professional PA systems, studio monitors, and discrete guitar amplifiers requiring stable component supply and consistent parametric binning across production lots.
Supply support for FJA4310OTU 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 power management, analog, sensor, and discrete devices for automotive, industrial, and consumer applications.
The FJA4310OTU belongs to ON Semiconductor's legacy Fairchild discrete power transistor portfolio, engineered specifically for high-fidelity linear audio power amplification with emphasis on SOA robustness and thermal reliability.
FAQ
What is the maximum continuous collector current rating for FJA4310OTU?
The FJA4310OTU has a DC collector current rating of 10 A at TC = 25°C. Derating is required above this temperature per the power derating curve in the datasheet-e.g., ~0.8 A/°C reduction beyond 25°C case temperature. Operation at full 10 A requires effective heatsinking to maintain TC ≤ 25°C; actual usable current depends on thermal design and ambient conditions. The FJA4310OTU must not exceed its absolute maximum IC limit under any condition.
Does FJA4310OTU have a built-in base-emitter resistor or protection diode?
No, the FJA4310OTU is a bare NPN bipolar transistor with no integrated base-emitter shunt resistor or protection diodes. External base resistors, emitter degeneration resistors, and clamp diodes must be added per circuit requirements. This discrete architecture allows full design flexibility but requires careful attention to drive strength and secondary breakdown avoidance. The FJA4310OTU relies entirely on external components for safe linear operation.
What is the safe operating area (SOA) limitation for FJA4310OTU at 100 V VCE?
At VCE = 100 V, the FJA4310OTU's forward-bias SOA limits continuous DC current to approximately 0.4 A, but supports up to 10 A for pulse widths ≤ 10 ms with duty cycle ≤ 2%. This reflects its intended use in audio amplifiers handling short-duration transients. The SOA boundary is defined by both thermal limits and secondary breakdown constraints. The FJA4310OTU datasheet Figure 6 provides the exact SOA plot for design validation.
Is FJA4310OTU pin-compatible with FJA4210?
No, FJA4310OTU (NPN) and FJA4210 (PNP) are complementary devices-not pin-compatible. Both use TO-3P packages with identical pinout (1=Base, 2=Collector, 3=Emitter), but their polarity and biasing requirements differ fundamentally. They are intended for pairing in push-pull output stages, not substitution. Swapping FJA4310OTU for FJA4210 would reverse current direction and cause circuit failure. The FJA4310OTU must only be used in NPN-configured positions.
What hFE classification does FJA4310OTU carry, and how is it marked?
The FJA4310OTU is manufactured in three hFE classifications: R (50–100), O (70–140), and Y (90–180), marked by color-coded bands on the package body per Fairchild specification. The specific bin is not indicated in the part number FJA4310OTU itself-actual hFE must be verified per unit or lot via test data. For matched pairs, users must select units from the same bin or perform in-circuit characterization. The FJA4310OTU's hFE tolerance directly impacts quiescent current stability in Class AB designs.
FJA4310OTU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-3P-3, SC-65-3
- 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:
- 100 W
- Frequency - Transition:
- 30MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-3P
FJA4310OTU FAQ
1.How can I place an order for FJA4310OTU through Aetrix?
Please submit a Request for Quotation (RFQ) for FJA4310OTU 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 FJA4310OTU reliable?
The price and inventory of FJA4310OTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FJA4310OTU is usually 5 days.
3.What payment methods are accepted for FJA4310OTU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FJA4310OTU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FJA4310OTU?
FJA4310OTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FJA4310OTU 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 FJA4310OTU?
For technical support, including FJA4310OTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FJA4310OTU requirements.
6.How does Aetrix verify that FJA4310OTU is sourced from the original manufacturer or authorized distributors?
All FJA4310OTU 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 FJA4310OTU meets industry standards.
7.What is the process for return or replacement of FJA4310OTU?
All FJA4310OTU units undergo pre-shipment inspection (PSI). If there is an issue with FJA4310OTU, 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 FJA4310OTU part is unused and in its original packaging.
Return procedure for FJA4310OTU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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