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onsemi 2SA1020RLRA
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- Part No.:
- 2SA1020RLRA
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
2SA1020RLRA.pdf
- Description:
- TRANS PNP 50V 2A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:170,000
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Product details
Overview
2SA1020RLRA from onsemi is a Pb-free, through-hole PNP bipolar junction transistor rated for 50 V VCEO, 2.0 A continuous collector current, and 1.5 W power dissipation at TC = 25°C, optimized for high-current switching in power supply control, relay drivers, and DC-DC converter output stages.
For engineers reviewing the 2SA1020RLRA datasheet, pinout, applications, or equivalent options, key selection criteria include verified hFE ≥ 70 at IC = 500 mA, VCE(sat) ≤ 0.5 V at IC/IB = 10, thermal resistance RJC = 83.3°C/W, and TO-92 package compatibility with legacy board layouts.
Technical Context
The 2SA1020RLRA operates as a medium-power PNP switch with voltage-controlled base drive, supporting linear and saturated-mode operation. Its fT = 100 MHz enables stable performance in audio-frequency amplification and fast-switching applications up to ~10 MHz.
Designed for thermal reliability in constrained ambient conditions, it features RJA = 125°C/W and a −55°C to +150°C operating junction temperature range. Safe operating area (SOA) curves confirm capability under pulsed IC = −4.0 A with VCE ≤ −2.0 V at TJ = 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V - Maximum blocking voltage between collector and emitter before breakdown; defines upper rail limit in high-side switch designs. |
| IC (continuous) | 2.0 A - Sustained collector current capacity at TA = 25°C; derates to zero at TA ≈ 107°C per 5.0 mW/°C slope. |
| PD @ TC = 25°C | 1.5 W - Power dissipation limit when case temperature is maintained at 25°C; requires heatsinking for >1 W continuous operation. |
| hFE | 70–240 - DC current gain range at IC = 500 mA, VCE = 2.0 V; ensures reliable saturation with modest base drive (e.g., 50 mA for 1 A load). |
| VCE(sat) | ≤ 0.5 V - Collector-emitter saturation voltage at IC = 1.0 A, IB = 50 mA; limits conduction loss to ≤500 mW per device at full load. |
| fT | 100 MHz - Transition frequency at IC = 500 mA, VCE = 2.0 V; supports stable small-signal amplification up to mid-VHF band. |
Pinout & Package
2SA1020RLRA uses the TO-92 (Case 29-10, Style 14) plastic package with straight or bent leads, rated for 1 W ambient power dissipation and compatible with standard through-hole reflow or hand-solder processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Emitter | Current exit node in PNP configuration; connects to positive rail in high-side switch topologies. |
| 2 | Collector | Current entry node; ties to load return path or ground-referenced circuit nodes. |
| 3 | Base | Control terminal requiring negative bias relative to emitter; drives switching via current-limited source/sink. |
Key Features
| Feature | Design Value |
|---|---|
| Pb-free TO-92 packaging | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 3 moisture sensitivity level (MSL-3). |
| High hFE consistency | Minimum hFE = 70 at IC = 500 mA ensures predictable base drive requirements across production lots. |
| Low VCE(sat) | ≤0.5 V at IC/IB = 10 reduces conduction losses by >30% versus legacy PNP transistors with VCE(sat) > 0.7 V. |
| Extended SOA | Second breakdown-limited safe operating area supports 100 ms pulses up to −2.0 A at −20 V without degradation. |
Applications
| Power Supply Control | Relay Driver Circuit |
|---|---|
|
Use Scenario: Regulating output voltage in linear or quasi-resonant AC-DC adapters using emitter-follower pass configuration. IC Role / Device Role / Timing Role: High-current PNP pass transistor controlling feedback loop response and load transient recovery. Use Value: VCEO = 50 V and IC = 2.0 A enable direct integration into 24 V and 36 V secondary-side regulation without external boost circuitry. |
Use Scenario: Driving 12 V/24 V electromagnetic relays with coil currents up to 1.8 A in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Saturated-switch driver providing low-loss coil energization and fast turn-off via active base pull-down. Use Value: VCE(sat) ≤ 0.5 V minimizes relay coil heating; hFE ≥ 70 allows direct MCU GPIO drive without additional buffer stage. |
| DC-DC Converter Output Stage | Audio Amplifier Biasing |
|
Use Scenario: Implementing synchronous rectification or pre-regulation in isolated flyback or forward converters. IC Role / Device Role / Timing Role: High-speed PNP switch synchronizing with primary-side PWM to reduce output diode conduction loss. Use Value: fT = 100 MHz ensures clean switching edges up to 500 kHz; RJC = 83.3°C/W supports thermal stability under 1.2 W average dissipation. |
Use Scenario: Setting quiescent current in Class AB push-pull output stages of low-noise audio preamplifiers. IC Role / Device Role / Timing Role: Linear-mode current source establishing bias point for complementary NPN-PNP output pair. Use Value: Tight hFE distribution (70–240) enables precise current mirror matching; VEB = 5.0 V rating prevents base-emitter overvoltage during signal swing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 2SA1015GR | Lower VCEO = 50 V (same), but hFE min = 70 only at IC = 10 mA; fT = 80 MHz; RJC = 100°C/W. | Suitable for low-current biasing but marginal for 1.5 A switching due to higher VCE(sat) (0.6 V) and reduced SOA. | Select 2SA1015GR only when base drive is limited and thermal margin exceeds 25°C above ambient. |
| MJD2955G | TO-220 package; VCEO = 60 V; IC = 10 A; PD = 75 W; hFE = 20–70 at IC = 4 A; no Pb-free marking. | Requires PCB redesign for mounting and heatsinking; suited for >3 A loads where 2SA1020RLRA reaches thermal limit. | Choose MJD2955G when system-level power demand exceeds 1.5 W continuous or ambient temperature exceeds 70°C. |
Compared with 2SA1020RLRA, 2SA1015GR trades thermal robustness and high-current saturation for smaller footprint, while MJD2955G delivers scalable power handling at the cost of board space and assembly complexity-neither is pin-compatible, but both serve adjacent design tiers in PNP switching hierarchies.
Availability
2SA1020RLRA is available at Aetrix Electronics and suitable for power supply control, relay driver circuits, and DC-DC converter output stages requiring stable component supply, long-term manufacturability, and RoHS-compliant through-hole assembly.
Supply support for 2SA1020RLRA 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 supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The 2SA1020RLRA belongs to onsemi's general-purpose bipolar transistor product line, engineered for cost-sensitive, high-reliability discrete switching and amplification in consumer and industrial power electronics.
FAQ
What is the maximum continuous collector current rating for the 2SA1020RLRA?
The 2SA1020RLRA is rated for 2.0 A continuous collector current at TA = 25°C. This rating decreases linearly with ambient temperature at 5.0 mW/°C above 25°C, reaching zero at approximately TA = 107°C. For sustained operation above 1.0 A, thermal management via PCB copper pour or minimal heatsinking is recommended to maintain junction temperature within −55°C to +150°C limits.
Does the 2SA1020RLRA support Pb-free soldering processes?
Yes, the 2SA1020RLRA is explicitly marked as Pb-free in its ordering code (suffix "RLRAG") and complies with JEDEC J-STD-020D moisture sensitivity level 3. It supports standard lead-free reflow profiles with peak temperatures up to 260°C for 10 seconds, provided board layout provides adequate thermal relief to prevent package cracking during thermal cycling.
What is the typical DC current gain (hFE) of the 2SA1020RLRA at 1.5 A collector current?
Per the official onsemi datasheet, the 2SA1020RLRA guarantees hFE ≥ 40 at IC = 1.5 A and VCE = 2.0 V. This minimum value ensures sufficient current amplification for reliable saturation with base currents ≥75 mA, making it suitable for direct microcontroller-driven switching without intermediate buffer stages.
Can the 2SA1020RLRA be used in linear amplifier configurations?
Yes, the 2SA1020RLRA supports linear operation with verified fT = 100 MHz and consistent hFE across its specified current range. Its SOA curve confirms safe operation at VCE = −10 V and IC = −500 mA in Class A biasing, provided junction temperature remains below 150°C through appropriate heatsinking or current limiting.
What is the thermal resistance from junction to case (RJC) for the 2SA1020RLRA?
The 2SA1020RLRA has a specified thermal resistance of RJC = 83.3°C/W. This value reflects heat transfer efficiency from the silicon die to the TO-92 package case surface and is critical for estimating junction temperature rise when mounted to an external heatsink or thermally enhanced PCB pad. It enables calculation of ΔTJ = PD × 83.3°C/W under known power dissipation.
2SA1020RLRA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 2 A
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 50mA, 1A
- Current - Collector Cutoff (Max):
- 1µA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 70 @ 500mA, 2V
- Power - Max:
- 900 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92 (TO-226)
2SA1020RLRA FAQ
1.How can I place an order for 2SA1020RLRA through Aetrix?
Please submit a Request for Quotation (RFQ) for 2SA1020RLRA 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 2SA1020RLRA reliable?
The price and inventory of 2SA1020RLRA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SA1020RLRA is usually 5 days.
3.What payment methods are accepted for 2SA1020RLRA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SA1020RLRA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 2SA1020RLRA?
2SA1020RLRA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 2SA1020RLRA 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 2SA1020RLRA?
For technical support, including 2SA1020RLRA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SA1020RLRA requirements.
6.How does Aetrix verify that 2SA1020RLRA is sourced from the original manufacturer or authorized distributors?
All 2SA1020RLRA 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 2SA1020RLRA meets industry standards.
7.What is the process for return or replacement of 2SA1020RLRA?
All 2SA1020RLRA units undergo pre-shipment inspection (PSI). If there is an issue with 2SA1020RLRA, 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 2SA1020RLRA part is unused and in its original packaging.
Return procedure for 2SA1020RLRA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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