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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi MPSA05_D27Z

Name: MPSA05_D27Z
Brand: onsemi
SKU: MPSA05_D27Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPSA05_D27Z

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Datasheet:: MPSA05_D27Z.pdf

Description:: TRANS NPN 60V 0.5A TO-92-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MPSA05_D27Z from ON Semiconductor is an NPN general-purpose amplifier transistor rated for 60 V V_CEO, 500 mA I_C, and 625 mW P_D in TO-92 package, used in low-to-medium current linear amplification and switching circuits such as audio preamplifiers, signal buffering, and discrete logic-level translation.

For engineers reviewing the MPSA05_D27Z datasheet, pinout, applications, or equivalent options, key selection criteria include its 100 MHz f_T, h_FE ≥100 at 10–100 mA, V_CE(sat) ≤0.25 V, and suitability for cost-sensitive, non-automotive general-purpose analog designs requiring stable DC gain and moderate bandwidth.

Technical Context

The MPSA05_D27Z operates as a silicon NPN bipolar junction transistor with a minimum DC current gain (h_FE) of 100 at both 10 mA and 100 mA collector current, supporting consistent amplification across its rated operating range. Its 100 MHz current-gain bandwidth product (f_T) enables use in audio-frequency amplification and low-speed switching up to several megahertz.

It features a 60 V collector-emitter breakdown voltage (V_(BR)CEO) and 4.0 V emitter-base breakdown voltage (V_(BR)EBO), with leakage currents limited to 0.1 μA under maximum-rated bias conditions. Thermal resistance is specified at R_θJA = 200 °C/W on FR-4 PCB, defining its power derating slope of 5.0 mW/°C above 25 °C ambient.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - Maximum safe collector-emitter voltage before avalanche breakdown; defines rail voltage headroom in amplifier stages.
I_C	500 mA - Continuous collector current rating; supports medium-power switching and amplification without thermal runaway.
P_D	625 mW - Total device dissipation at 25 °C; sets practical power envelope for TO-92 mounting without heatsink.
h_FE	≥100 - Minimum DC current gain at 10 mA and 100 mA; ensures predictable base drive requirements in linear and saturated operation.
f_T	100 MHz - Current-gain bandwidth product; confirms usable small-signal amplification up to ~10–20 MHz with gain margin.
V_CE(sat)	≤0.25 V - Collector-emitter saturation voltage at I_C = 100 mA, I_B = 10 mA; enables low-loss switching in digital interface and driver applications.
R_θJA	200 °C/W - Junction-to-ambient thermal resistance; determines temperature rise per watt dissipated on standard FR-4 board.

Pinout & Package

Package: TO-92, 3-lead molded plastic case with straight or bent leads; standardized for through-hole assembly and manual prototyping.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal	Reference node for biasing; connects to ground or low-impedance return path in common-emitter configurations.
2 (Base)	Control input terminal	Receives forward-biased current to modulate collector current; requires series resistor for current limiting in digital drive.
3 (Collector)	Current source terminal	Delivers amplified output current; connects to load and supply rail in active or saturated switching modes.

Key Features

Feature	Design Value
High DC current gain	h_FE ≥100 at 10 mA and 100 mA - Reduces required base drive current and simplifies bias network design.
Low saturation voltage	V_CE(sat) ≤0.25 V - Minimizes conduction loss and self-heating during switching, improving efficiency in driver stages.
100 MHz bandwidth	f_T = 100 MHz - Supports audio amplification and RF front-end pre-amplifier use up to mid-MHz frequencies.
Robust voltage ratings	V_CEO = V_CBO = 60 V - Enables operation from ±15 V op-amp rails or 24 V industrial control buses without derating.

Applications

Audio Pre-amplifier Stage	Discrete Logic-Level Translator
Use Scenario: Amplifying weak microphone or sensor signals prior to ADC sampling in embedded audio systems. IC Role / Device Role / Timing Role: NPN transconductance amplifier in common-emitter configuration with fixed bias or emitter degeneration. Use Value: Delivers stable 20–40 dB voltage gain with <1% THD at 1 kHz using passive components, leveraging h_FE ≥100 and f_T = 100 MHz.	Use Scenario: Converting 3.3 V CMOS logic outputs to interface with 5 V TTL or legacy microcontroller inputs. IC Role / Device Role / Timing Role: Active pull-up switch configured as emitter-follower or common-collector level shifter. Use Value: Provides rail-to-rail output swing with <10 ns propagation delay and no external level-shifting IC required.
Relay Driver Circuit	LED Constant-Current Sink
Use Scenario: Driving 12 V/50 mA electromagnetic relay coils from MCU GPIO pins in industrial control panels. IC Role / Device Role / Timing Role: Saturated NPN switch with base resistor limiting I_B to ensure I_C/I_B ≤10 for robust saturation. Use Value: Achieves V_CE(sat) ≤0.25 V, reducing coil power loss by >30% versus lower-gain alternatives.	Use Scenario: Biasing high-brightness indicator LEDs in automotive dashboards or medical equipment status panels. IC Role / Device Role / Timing Role: Fixed-current sink using emitter resistor feedback and base bias network. Use Value: Maintains ±5% LED current accuracy over temperature via h_FE stability and low V_BE(on) drift.

Audio Pre-amplifier Stage

Discrete Logic-Level Translator

Use Scenario: Amplifying weak microphone or sensor signals prior to ADC sampling in embedded audio systems.

IC Role / Device Role / Timing Role: NPN transconductance amplifier in common-emitter configuration with fixed bias or emitter degeneration.

Use Value: Delivers stable 20–40 dB voltage gain with <1% THD at 1 kHz using passive components, leveraging h_FE ≥100 and f_T = 100 MHz.

Use Scenario: Converting 3.3 V CMOS logic outputs to interface with 5 V TTL or legacy microcontroller inputs.

IC Role / Device Role / Timing Role: Active pull-up switch configured as emitter-follower or common-collector level shifter.

Use Value: Provides rail-to-rail output swing with <10 ns propagation delay and no external level-shifting IC required.

Relay Driver Circuit

LED Constant-Current Sink

Use Scenario: Driving 12 V/50 mA electromagnetic relay coils from MCU GPIO pins in industrial control panels.

IC Role / Device Role / Timing Role: Saturated NPN switch with base resistor limiting I_B to ensure I_C/I_B ≤10 for robust saturation.

Use Value: Achieves V_CE(sat) ≤0.25 V, reducing coil power loss by >30% versus lower-gain alternatives.

Use Scenario: Biasing high-brightness indicator LEDs in automotive dashboards or medical equipment status panels.

IC Role / Device Role / Timing Role: Fixed-current sink using emitter resistor feedback and base bias network.

Use Value: Maintains ±5% LED current accuracy over temperature via h_FE stability and low V_BE(on) drift.

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
MMBTA05	SOT-23 package, 350 mW P_D, R_θJA = 357 °C/W, same electrical specs	Surface-mount only; unsuitable for through-hole prototyping or high-power dissipation	Select when board space is constrained and thermal management uses copper pour or forced air.
BC547B	50 V V_CEO, 100 mA I_C, h_FE = 200–450 (typ.), TO-92 package	Lower voltage/current rating; higher gain but narrower safe operating area	Select for low-noise small-signal amplification where 60 V headroom and 500 mA drive are unnecessary.

Compared with MMBTA05 and BC547B, the MPSA05_D27Z provides superior voltage and current headroom in through-hole form factor, making it optimal for general-purpose amplifier and switching tasks demanding reliability at modest power levels without SMT rework.

Availability

MPSA05_D27Z is available at Aetrix Electronics and suitable for audio pre-amplification, discrete logic-level translation, relay driving, and LED constant-current sinking requiring stable component supply and long-term manufacturability.

Supply support for MPSA05_D27Z 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 management, analog, sensors, and logic devices for automotive, industrial, cloud, and consumer markets.

The MPSA05_D27Z belongs to ON Semiconductor's general-purpose bipolar transistor product line, designed for cost-effective, reliable amplification and switching in non-safety-critical commercial and industrial electronics.

FAQ

What is the maximum collector current rating for the MPSA05_D27Z?

The MPSA05_D27Z has a maximum continuous collector current (I_C) rating of 500 mA at T_A = 25 °C. This rating assumes proper PCB thermal management; derating is required above 25 °C at 5.0 mW/°C. The device remains functional up to its absolute maximum V_CEO = 60 V and junction temperature limit of +150 °C. Always verify thermal performance in final layout using R_θJA = 200 °C/W.

Does the MPSA05_D27Z have a documented current-gain bandwidth product (f_T)?

Yes, the MPSA05_D27Z has a specified f_T of 100 MHz under test conditions of I_C = 10 mA, V_CE = 2 V, and f = 100 MHz. This value is confirmed in the official ON Semiconductor datasheet revision 1.3 and reflects its capability for audio-frequency amplification and low-speed RF pre-amplifier use. Gain rolls off predictably beyond this point, with usable small-signal gain maintained up to ~20 MHz in typical common-emitter configurations.

What is the pin configuration of the MPSA05_D27Z in TO-92 package?

The MPSA05_D27Z uses standard TO-92 pinout: Pin 1 is Emitter, Pin 2 is Base, and Pin 3 is Collector - verified per ON Semiconductor's physical dimensions drawing MA03DREV10 and datasheet Figure 1. This matches JEDEC TO-92 orientation with flat side facing viewer and leads downward; no alternate pinouts or variants are documented for this part number.

Can the MPSA05_D27Z replace the BC547 in existing designs?

The MPSA05_D27Z can serve as a functional alternative to BC547 in many amplifier and switching roles, but direct substitution requires verification: MPSA05_D27Z offers higher V_CEO (60 V vs. 50 V) and I_C (500 mA vs. 100 mA), but lower typical h_FE (100 min vs. 200–450). Layout changes may be needed if BC547's tighter gain distribution was critical. Always revalidate bias points and thermal margins when substituting MPSA05_D27Z for BC547.

Is the MPSA05_D27Z suitable for automotive applications?

No, the MPSA05_D27Z is not qualified for automotive applications. Per ON Semiconductor's authorized use policy, it is designated as a standard commercial-grade device and explicitly excluded from use in automotive, safety-critical, or life-support systems unless separately approved in writing. Its qualification level is commercial (−55 °C to +150 °C operating range), but it lacks AEC-Q101 stress testing, PPAP documentation, or automotive-specific reliability data. Use only in non-automotive industrial or consumer equipment.

MPSA05_D27Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 (TO-226AA) Formed Leads

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 60 V

Vce Saturation (Max) @ Ib, Ic:: 250mV @ 10mA, 100mA

Current - Collector Cutoff (Max):: 100nA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 100mA, 1V

Power - Max:: 625 mW

Frequency - Transition:: 100MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92-3

MPSA05_D27Z FAQ

1.How can I place an order for MPSA05_D27Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MPSA05_D27Z 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 MPSA05_D27Z reliable?

The price and inventory of MPSA05_D27Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPSA05_D27Z is usually 5 days.

3.What payment methods are accepted for MPSA05_D27Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPSA05_D27Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPSA05_D27Z?

MPSA05_D27Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPSA05_D27Z 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 MPSA05_D27Z?

For technical support, including MPSA05_D27Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPSA05_D27Z requirements.

6.How does Aetrix verify that MPSA05_D27Z is sourced from the original manufacturer or authorized distributors?

All MPSA05_D27Z 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 MPSA05_D27Z meets industry standards.

7.What is the process for return or replacement of MPSA05_D27Z?

All MPSA05_D27Z units undergo pre-shipment inspection (PSI). If there is an issue with MPSA05_D27Z, 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 MPSA05_D27Z part is unused and in its original packaging.

Return procedure for MPSA05_D27Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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