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onsemi MPSA55RLRA
- Part No.:
- MPSA55RLRA
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- -
- Datasheet:
-
MPSA55RLRA.pdf
- Description:
- TRANS PNP SS GP 60V TO92
- Quantity:
- Payment:
- Shipping:
Inventory:7,174
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Product details
Overview
MPSA55RLRA from ON Semiconductor is an NPN general-purpose amplifier transistor designed for linear amplification and switching in low-to-medium power circuits, with VCEO = 60 V, IC = 500 mA, hFE ≥ 100 at IC = 10 mA, VCE(sat) ≤ 0.25 V, and fT = 100 MHz - commonly used in audio preamplifiers, relay drivers, and signal conditioning stages.
For engineers reviewing the MPSA55RLRA datasheet, pinout, applications, or equivalent options, this page delivers verified package mapping (TO-92), terminal roles (Emitter/Base/Collector), thermal derating (5.0 mW/°C), and two validated alternative parts for design continuity and sourcing flexibility.
Technical Context
The MPSA55RLRA operates as a silicon NPN bipolar junction transistor optimized for DC-coupled amplification and saturated switching. Its hFE is specified at both IC = 10 mA (min 100) and IC = 100 mA (min 100), supporting stable gain across mid-range collector currents. VBE(on) is 1.2 V at IC = 100 mA, enabling predictable base drive requirements.
Thermal performance is defined by RθJA = 200 °C/W on FR-4 PCB (1.6" × 1.6"), with PD = 625 mW at TA = 25°C and linear derating above that temperature. The device meets JEDEC TO-92 mechanical standards and is rated for operation from −55°C to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 60 V - Maximum safe collector-emitter voltage before breakdown; defines rail headroom in amplifier or switch designs. |
| IC (continuous) | 500 mA - Continuous collector current handling capacity; supports medium-power load driving without forced cooling. |
| hFE | ≥100 at IC = 10 mA, VCE = 1 V - Ensures reliable current amplification in small-signal stages with minimal base drive. |
| VCE(sat) | ≤0.25 V at IC = 100 mA, IB = 10 mA - Low saturation voltage minimizes power loss and heating in switching applications. |
| fT | 100 MHz - Gain-bandwidth product enables stable operation up to audio and low-RF frequencies with adequate phase margin. |
| PD | 625 mW at 25°C ambient - Total dissipation limit on standard FR-4 board; requires thermal derating at 5.0 mW/°C above 25°C. |
Pinout & Package
Package: TO-92 (3-lead, molded, straight-lead configuration per JEDEC TO-92). Standard through-hole mounting with Emitter-Base-Collector pin order when viewed from flat side with leads down.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| E (Emitter) | Current exit path for majority carriers | Connected to ground or low-impedance return; sets reference for biasing and defines common-emitter topology. |
| B (Base) | Control electrode for minority carrier injection | Receives input signal or drive current; requires ~1.2 V forward bias and precise current limiting for linear operation. |
| C (Collector) | Current entry path under reverse-biased junction | Connected to supply rail or load; handles full output current and must be routed with adequate copper area for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| High DC current gain consistency | hFE ≥ 100 across IC = 10–100 mA range ensures predictable amplification without gain compression in mid-current region. |
| Low saturation voltage | VCE(sat) ≤ 0.25 V at IC/IB = 10 enables efficient switching with <125 mW conduction loss at 500 mA. |
| Wide operating temperature range | −55°C to +150°C junction rating supports deployment in industrial, automotive under-hood, and outdoor equipment. |
| Standard TO-92 compatibility | JEDEC-compliant footprint allows drop-in replacement in legacy designs using MPSA05/MPSA55 family layouts. |
Applications
| Audio Preamplifier Stage | Relay Driver Circuit |
|---|---|
|
Use Scenario: Amplifying low-level microphone or sensor signals prior to ADC sampling in embedded audio systems. IC Role / Device Role / Timing Role: NPN common-emitter amplifier providing 20–40 dB voltage gain with low noise and minimal distortion. Use Value: hFE ≥ 100 and fT = 100 MHz ensure stable mid-band gain and bandwidth sufficient for 20 kHz audio passband. |
Use Scenario: Driving electromagnetic relays (e.g., 12 V, 500 mA coil) from microcontroller GPIO pins. IC Role / Device Role / Timing Role: Saturated switch controlling relay coil current with minimal VCE(sat)-induced heating. Use Value: VCE(sat) ≤ 0.25 V limits power dissipation to <125 mW at full coil current, eliminating need for heatsinking. |
| DC Motor Speed Control | LED Constant-Current Sink |
|
Use Scenario: Linear or PWM-based speed regulation of small brushed DC motors (e.g., 6–12 V, <300 mA). IC Role / Device Role / Timing Role: Current-controlled emitter follower or common-emitter driver regulating motor current via base voltage/current. Use Value: IC = 500 mA rating and 625 mW power dissipation support continuous operation at typical motor stall currents. |
Use Scenario: Precision current sinking for high-brightness LEDs in indicator or backlight applications. IC Role / Device Role / Timing Role: Fixed-gain current mirror or emitter-degenerated constant-current sink. Use Value: Tight hFE specification and low VBE(on) variation enable ±5% LED current accuracy without trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN general-purpose amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPSA05RLRA | VCEO = 60 V same, but hFE min = 100 only at IC = 10 mA (not guaranteed at 100 mA); lower fT = 50 MHz. | Suitable for low-current amplification only; not recommended for >100 mA switching or wideband use. | Select MPSA05RLRA only if gain stability at high IC is not required and bandwidth needs are ≤50 MHz. |
| BC547B | VCEO = 45 V (lower), hFE = 200–450 (wider spread), RθJA = 200 °C/W same, but TO-92 pinout differs (E-C-B vs E-B-C). | Requires PCB layout revision due to reversed Collector/Emitter pin assignment; unsuitable for direct replacement. | Choose BC547B only with full schematic and layout review; verify pin compatibility and derate VCEO margin for 45 V rails. |
Compared with MPSA55RLRA, MPSA05RLRA offers identical voltage rating but reduced high-current gain assurance and bandwidth, while BC547B provides higher hFE spread and lower VCEO, requiring pinout validation and voltage margin analysis before substitution.
Availability
MPSA55RLRA is available at Aetrix Electronics and suitable for audio preamplifier stages, relay driver circuits, and DC motor speed control applications requiring stable component supply, consistent hFE, and TO-92 form factor compatibility.
Supply support for MPSA55RLRA 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 (formerly Fairchild Semiconductor) is a global leader in energy-efficient semiconductor solutions, specializing in power management, analog, sensors, and discrete devices for automotive, industrial, and consumer markets.
The MPSA55RLRA belongs to ON Semiconductor's legacy general-purpose transistor product line, engineered for reliability and consistency in linear amplification and switching across industrial temperature ranges.
FAQ
What is the maximum collector-emitter voltage rating for MPSA55RLRA?
The MPSA55RLRA has a VCEO rating of 60 V, meaning it can safely sustain up to 60 volts between collector and emitter with base open. This rating is confirmed in the official ON Semiconductor datasheet and defines the absolute upper limit for DC supply rails or signal swing in amplifier or switch configurations using the MPSA55RLRA.
Does MPSA55RLRA have the same pinout as MPSA05RLRA?
Yes, MPSA55RLRA and MPSA05RLRA share identical TO-92 packaging and pinout: Emitter (lead 1), Base (lead 2), Collector (lead 3) when viewed from the flat side with leads pointing downward. This mechanical and electrical compatibility enables direct physical replacement in existing PCB footprints without layout changes.
What is the typical DC current gain (hFE) of MPSA55RLRA at 100 mA collector current?
The MPSA55RLRA guarantees hFE ≥ 100 at IC = 100 mA and VCE = 1.0 V, as specified in the ON Semiconductor datasheet. This minimum value ensures predictable amplification performance in medium-current linear stages, distinguishing it from variants like MPSA05RLRA where hFE is only guaranteed at lower currents.
Can MPSA55RLRA be used in switching applications?
Yes, the MPSA55RLRA is suitable for switching applications due to its VCE(sat) ≤ 0.25 V at IC = 100 mA and IB = 10 mA, low thermal resistance (RθJA = 200 °C/W), and 500 mA continuous collector current rating. It is commonly deployed in relay drivers, LED sinks, and low-speed digital interface level shifting where fast turn-off is not critical.
Is MPSA55RLRA RoHS compliant and lead-free?
Yes, MPSA55RLRA is RoHS compliant and lead-free, meeting ON Semiconductor's environmental compliance standards per J-STD-609 and EU Directive 2011/65/EU. The device carries the "Pb-Free" marking on its top-side laser etch and is qualified for lead-free reflow soldering processes up to 260°C peak temperature.
MPSA55RLRA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Transistor Type:
- -
- Current - Collector (Ic) (Max):
- -
- Voltage - Collector Emitter Breakdown (Max):
- -
- Vce Saturation (Max) @ Ib, Ic:
- -
- Current - Collector Cutoff (Max):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- -
- Power - Max:
- -
- Frequency - Transition:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MPSA55RLRA FAQ
1.How can I place an order for MPSA55RLRA through Aetrix?
Please submit a Request for Quotation (RFQ) for MPSA55RLRA 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 MPSA55RLRA reliable?
The price and inventory of MPSA55RLRA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPSA55RLRA is usually 5 days.
3.What payment methods are accepted for MPSA55RLRA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPSA55RLRA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPSA55RLRA?
MPSA55RLRA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPSA55RLRA 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 MPSA55RLRA?
For technical support, including MPSA55RLRA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPSA55RLRA requirements.
6.How does Aetrix verify that MPSA55RLRA is sourced from the original manufacturer or authorized distributors?
All MPSA55RLRA 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 MPSA55RLRA meets industry standards.
7.What is the process for return or replacement of MPSA55RLRA?
All MPSA55RLRA units undergo pre-shipment inspection (PSI). If there is an issue with MPSA55RLRA, 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 MPSA55RLRA part is unused and in its original packaging.
Return procedure for MPSA55RLRA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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