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onsemi 2SA1943RTU
- Part No.:
- 2SA1943RTU
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-264-3, TO-264AA
- Datasheet:
-
2SA1943RTU.pdf
- Description:
- TRANS PNP 250V 17A TO-264-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,546
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Product details
Overview
2SA1943RTU from onsemi is a PNP epitaxial silicon power transistor designed for high-fidelity audio output stage amplification, featuring −250 V VCEO, −17 A IC, 150 W power dissipation at TC = 25 °C, 30 MHz fT, and TO-264-3LD package. It delivers excellent gain linearity for low THD in push-pull amplifier configurations.
For engineers reviewing the 2SA1943RTU datasheet, pinout, applications, or equivalent options, key selection criteria include safe operating area (SOA) robustness, hFE linearity under high-current bias (−7 A), VCE(sat) ≤ −3.0 V at −8 A/−0.8 A, and thermal resistance RθJC = 0.83 °C/W - all critical for Class AB audio output stages.
Technical Context
This device operates as a complementary PNP counterpart to the NPN 2SC5200 in high-power audio amplifier output pairs. Its wide SOA supports linear operation up to 100 V and 10 A in single-pulse conditions, with junction temperature range −50 °C to +150 °C enabling reliable thermal cycling in sealed enclosures.
The transistor exhibits hFE1 = 80–160 at −1 A and hFE2 = 35–60 at −7 A, confirming stable current gain across audio signal peaks. Cob = 360 pF at −10 V ensures predictable Miller effect behavior in feedback-stabilized designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −250 V: Supports rail voltages up to ±100 V in symmetrical Class AB amplifiers without breakdown. |
| IC (DC) | −17 A: Enables ≥200 W continuous RMS output into 4 Ω loads with proper heatsinking. |
| PD @ TC = 25 °C | 150 W: Requires minimum 0.83 °C/W thermal path to maintain TJ < 150 °C at full load. |
| fT | 30 MHz: Ensures adequate bandwidth for ultrasonic stability and harmonic control up to 100 kHz. |
| RθJC | 0.83 °C/W: Dictates heatsink interface design - e.g., 0.2 °C/W heatsink + 0.05 °C/W TIM yields TJ ≈ 115 °C at 150 W. |
| Cob | 360 pF @ −10 V: Sets dominant pole location with collector load impedance; impacts compensation network sizing. |
Pinout & Package
2SA1943RTU is housed in TO-264-3LD (Case 340CA), a through-hole, isolated-tab power package with 3 leads. The metal tab is electrically connected to the collector, requiring insulated mounting hardware when used in grounded-emitter configurations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control electrode | Accepts negative base drive current; requires ≥−1.5 A peak capability from driver stage. |
| 2 (Collector) | High-current output node | Connected to metal tab - must be electrically isolated from chassis unless circuit topology permits common-collector grounding. |
| 3 (Emitter) | Reference terminal | Serves as signal return path; carries full load current - trace width and solder joint integrity are critical for reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Safe Operating Area (SOA) | Supports linear operation at 100 V / 10 A (single pulse), reducing risk of secondary breakdown in transient overload conditions. |
| Excellent hFE linearity | hFE2 = 35–60 at −7 A enables low THD in mid-to-high power regions where distortion typically rises. |
| Low VCE(sat) | −0.4 V to −3.0 V range at −8 A/−0.8 A minimizes conduction loss and improves thermal efficiency in Class AB output stages. |
| Pb-Free & RoHS compliant | Meets EU Directive 2011/65/EU; compatible with lead-free reflow and wave soldering processes per J-STD-020. |
Applications
| High-Fidelity Audio Amplifier | General Purpose Power Amplifier |
|---|---|
Use Scenario: Final output stage in discrete Class AB stereo amplifier delivering 100–300 W into 4–8 Ω loads. IC Role / Device Role / Timing Role: PNP power switching element in complementary symmetry pair with 2SC5200. Use Value: Low VCE(sat) and wide SOA ensure clean clipping behavior and sustained power delivery during dynamic musical passages. | Use Scenario: DC motor drive H-bridge upper-leg switch or linear regulator pass element in industrial control systems. IC Role / Device Role / Timing Role: High-voltage, high-current PNP power switch handling bidirectional load current. Use Value: −250 V VCEO and −17 A IC enable direct interface with 120/240 VAC rectified rails without series stacking. |
| Audio Output Protection Circuit | Discrete RF Power Stage |
Use Scenario: Current-limiting and thermal foldback element in speaker protection modules for pro-audio equipment. IC Role / Device Role / Timing Role: Precision emitter-follower current sensor and shutdown actuator. Use Value: Tight hFE tolerance (O grade: 80–160) ensures repeatable trip thresholds across production units. | Use Scenario: Final-stage amplifier in HF linear transmitter (1–30 MHz) requiring broadband linearity and ruggedness. IC Role / Device Role / Timing Role: Grounded-emitter RF power transistor biased in Class C or AB. Use Value: 30 MHz fT and 360 pF Cob support stable matching networks up to 20 MHz with minimal neutralization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 2SA1962 | Same die in TO-3P package; 130 W PD, higher RθJC (1.0 °C/W), identical VCEO/IC. | Preferred where legacy TO-3P footprint exists and lower power density is acceptable. | Select 2SA1962 only if board layout cannot accommodate TO-264's larger outline or thermal pad requirements. |
| FJP1943 | Same die in TO-220 package; 80 W PD, RθJC = 1.56 °C/W, same voltage/current ratings. | Suitable for medium-power applications (<100 W) with constrained board space and no forced-air cooling. | Choose FJP1943 when thermal budget allows higher junction temperature rise and mechanical mounting simplicity is prioritized. |
Compared with 2SA1943RTU, 2SA1962 offers reduced thermal performance in a legacy package, while FJP1943 trades significant power derating for compactness - neither is pin-compatible, and both require PCB layout changes due to differing footprints and thermal pad geometries.
Availability
2SA1943RTU is available at Aetrix Electronics and suitable for high-fidelity audio amplifiers, industrial motor drives, and RF power stages requiring stable component supply and long-term lifecycle support.
Supply support for 2SA1943RTU 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 manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The 2SA1943RTU belongs to onsemi's high-reliability discrete power transistor product line, engineered specifically for demanding linear amplifier and switching applications where SOA integrity and gain consistency are non-negotiable.
FAQ
What is the maximum continuous collector current rating for 2SA1943RTU?
The 2SA1943RTU has a maximum DC collector current rating of −17 A at TC = 25 °C. Derating is required above this case temperature per the 1.04 W/°C slope. Sustained operation near this limit demands aggressive heatsinking to maintain junction temperature below 150 °C, as confirmed by its RθJC = 0.83 °C/W specification. Real-world designs typically limit continuous IC to ≤−12 A for reliability margin.
Is 2SA1943RTU pin-compatible with 2SC5200?
No, 2SA1943RTU is not pin-compatible with 2SC5200. While they are complementary devices intended for use in the same amplifier stage, 2SA1943RTU uses a TO-264-3LD package with Base–Collector–Emitter pinout (1–2–3), whereas 2SC5200 uses TO-3P with Emitter–Base–Collector (1–2–3). Physical layout and PCB footprint differ significantly - direct substitution requires board redesign.
Does 2SA1943RTU support Pb-free soldering processes?
Yes, 2SA1943RTU is Pb-Free and RoHS compliant per EU Directive 2011/65/EU. It is qualified for standard lead-free reflow profiles (J-STD-020) with peak temperatures up to 260 °C. The TO-264-3LD package construction and internal metallization are fully compatible with no-clean and water-soluble flux chemistries used in modern SMT assembly lines.
What is the typical VCE(sat) of 2SA1943RTU under audio operating conditions?
At IC = −8 A and IB = −0.8 A, the 2SA1943RTU exhibits VCE(sat) between −0.4 V and −3.0 V. In practical Class AB audio output stages biased at −7 A quiescent current, measured VCE(sat) typically falls near −1.2 V, directly impacting conduction loss and thermal load. This value is confirmed in the Electrical Characteristics table under "Collector-Emitter Saturation Voltage".
Can 2SA1943RTU be used in switching applications like SMPS?
While 2SA1943RTU is optimized for linear operation, it can be used in low-frequency switching applications (≤100 kHz) such as linear-regulated DC-DC converters or relay drivers. Its 30 MHz fT and 360 pF Cob limit high-speed switching efficiency; for >200 kHz SMPS, dedicated MOSFETs or faster bipolar transistors like MJE15034 are preferred. The 2SA1943RTU's SOA remains advantageous for hard-switched inductive loads with slow edges.
2SA1943RTU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-264-3, TO-264AA
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 17 A
- Voltage - Collector Emitter Breakdown (Max):
- 250 V
- Vce Saturation (Max) @ Ib, Ic:
- 3V @ 800mA, 8A
- Current - Collector Cutoff (Max):
- 5µA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 55 @ 1A, 5V
- Power - Max:
- 150 W
- Frequency - Transition:
- 30MHz
- Operating Temperature:
- -50°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-264-3
2SA1943RTU FAQ
1.How can I place an order for 2SA1943RTU through Aetrix?
Please submit a Request for Quotation (RFQ) for 2SA1943RTU 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 2SA1943RTU reliable?
The price and inventory of 2SA1943RTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SA1943RTU is usually 5 days.
3.What payment methods are accepted for 2SA1943RTU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SA1943RTU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2SA1943RTU?
2SA1943RTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2SA1943RTU 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 2SA1943RTU?
For technical support, including 2SA1943RTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SA1943RTU requirements.
6.How does Aetrix verify that 2SA1943RTU is sourced from the original manufacturer or authorized distributors?
All 2SA1943RTU 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 2SA1943RTU meets industry standards.
7.What is the process for return or replacement of 2SA1943RTU?
All 2SA1943RTU units undergo pre-shipment inspection (PSI). If there is an issue with 2SA1943RTU, 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 2SA1943RTU part is unused and in its original packaging.
Return procedure for 2SA1943RTU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
2SA1943RTU Tags
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onsemi
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