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

onsemi MPSA70RLRMG

Name: MPSA70RLRMG
Brand: onsemi
SKU: MPSA70RLRMG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPSA70RLRMG

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-226-3, TO-92-3 Long Body, Formed Leads

Datasheet:: MPSA70RLRMG.pdf

Description:: TRANS PNP 40V 0.1A TO92

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MPSA70RLRMG from onsemi is a PNP silicon small-signal amplifier transistor in TO-92 package, rated for −40 V V_CEO, −100 mA I_C, and 625 mW P_D at T_A = 25°C, with h_FE = 40–400 at I_C = −5 mA and V_CE = −10 V, widely used in low-noise audio preamplifier stages and discrete bias networks.

For engineers reviewing the MPSA70RLRMG datasheet, pinout, applications, or equivalent options, key selection criteria include its PNP polarity, TO-92 mechanical compatibility, −40 V breakdown rating, noise performance below 10 nV/√Hz at 1 kHz, and suitability for linear amplification in battery-powered analog signal chains.

Technical Context

This PNP bipolar junction transistor operates in active and saturation regions with verified DC current gain (h_FE) spanning 40 to 400 across collector currents from 0.1 mA to 100 mA. Its f_T of 125 MHz supports high-frequency small-signal amplification up to VHF band edges when biased appropriately.

Thermal resistance R_JA = 200 °C/W and R_JC = 83.3 °C/W confirm its suitability for ambient-temperature-limited PCB layouts without heatsinking. The device exhibits C_obo ≤ 4.0 pF and V_CE(sat) ≤ −0.25 V at I_C = −10 mA/I_B = −1 mA, enabling efficient switching in low-power logic interface circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−40 V - Maximum safe collector-emitter voltage before avalanche breakdown; defines upper rail limit in PNP common-emitter amplifier designs.
I_C (max)	−100 mA - Continuous collector current capacity; sets maximum load drive capability in active-region biasing.
P_D @ 25°C	625 mW - Power dissipation limit at room ambient; determines thermal derating slope (5.0 mW/°C) for enclosure-free operation.
h_FE	40–400 - DC current gain range at I_C = −5 mA/V_CE = −10 V; enables predictable base drive sizing for gain-stable amplifiers.
f_T	125 MHz - Transition frequency; confirms usable bandwidth for RF preamp or oscillator buffer applications up to ~20 MHz with margin.
V_CE(sat)	≤ −0.25 V - Saturation voltage at I_C/I_B = 10; ensures low conduction loss in PNP switch configurations.
C_obo	≤ 4.0 pF - Output capacitance at V_CB = −10 V; minimizes Miller effect in high-gain CE stages above 10 MHz.

Pinout & Package

Package: TO-92 (Case 29-11), Pb-free, through-hole mounting with 2.54 mm lead pitch. Standard marking includes "MPSA70" and date code; leads are arranged E-B-C (Emitter–Base–Collector) when viewed with flat side facing user and leads downward.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal for PNP operation	Connected to higher potential rail in common-emitter configuration; base current flows out of this terminal.
2 (Base)	Control electrode for minority-carrier injection	Receives forward-biased current to modulate collector current; requires series resistor for stable DC biasing.
3 (Collector)	Current source terminal under active bias	Typically tied to load or supply rail; voltage swing here is inverted relative to base input in amplifier use.

Key Features

Feature	Design Value
Low-noise amplification	en ≤ 10 nV/√Hz at 1 kHz (IC = 1 mA); enables high-fidelity audio preamp stages without added op-amp complexity.
Pb-free TO-92 packaging	RoHS-compliant construction with standard 2,000-unit ammo pack shipping; eliminates lead-based solder compatibility concerns.
Wide h_FE spread	40–400 gain range allows binning for matched pairs in differential amplifiers or consistent bias design across production lots.
High f_T / low C_obo	125 MHz f_T with ≤4 pF output capacitance supports stable gain >10 up to 10 MHz in common-emitter topology.
Robust thermal rating	T_J = −55°C to +150°C operating range and 200°C/W R_JA support industrial temperature deployments without forced cooling.

Applications

Audio Preamp Stage	Discrete Bias Network
Use Scenario: Low-level microphone signal amplification in portable voice recorders before ADC sampling. IC Role / Device Role / Timing Role: PNP small-signal amplifier in common-emitter configuration with emitter degeneration for linearity. Use Value: Delivers ≥40 dB voltage gain with <1% THD at 1 kHz and input-referred noise <8 nV/√Hz, eliminating need for costly low-noise op-amps.	Use Scenario: Setting precise quiescent current in Class-A headphone amplifier output stage using complementary NPN/PNP pair. IC Role / Device Role / Timing Role: PNP current source element in V_BE-multiplier bias generator. Use Value: Stable h_FE and low V_CE(sat) ensure ±5% I_C tolerance over temperature, preventing thermal runaway in output transistors.
Level-Shifting Interface	Low-Power Switch Driver
Use Scenario: Translating 3.3 V logic-high signals to −5 V rail in mixed-voltage analog subsystems. IC Role / Device Role / Timing Role: Saturated PNP switch with base resistor limiting I_B to achieve I_C/I_B ≈ 10. Use Value: V_CE(sat) ≤ −0.25 V ensures <0.3 V drop across collector-emitter path, preserving negative rail integrity for downstream comparators.	Use Scenario: Driving LED anodes in multiplexed 7-segment displays powered from −12 V supply. IC Role / Device Role / Timing Role: Low-side PNP current sink controlling segment current via base pulsed at 1 kHz. Use Value: 125 MHz f_T and fast turn-off time (<100 ns) enable clean 1 kHz multiplexing without ghosting or brightness variation.

Audio Preamp Stage

Discrete Bias Network

Use Scenario: Low-level microphone signal amplification in portable voice recorders before ADC sampling.

IC Role / Device Role / Timing Role: PNP small-signal amplifier in common-emitter configuration with emitter degeneration for linearity.

Use Value: Delivers ≥40 dB voltage gain with <1% THD at 1 kHz and input-referred noise <8 nV/√Hz, eliminating need for costly low-noise op-amps.

Use Scenario: Setting precise quiescent current in Class-A headphone amplifier output stage using complementary NPN/PNP pair.

IC Role / Device Role / Timing Role: PNP current source element in V_BE-multiplier bias generator.

Use Value: Stable h_FE and low V_CE(sat) ensure ±5% I_C tolerance over temperature, preventing thermal runaway in output transistors.

Level-Shifting Interface

Low-Power Switch Driver

Use Scenario: Translating 3.3 V logic-high signals to −5 V rail in mixed-voltage analog subsystems.

IC Role / Device Role / Timing Role: Saturated PNP switch with base resistor limiting I_B to achieve I_C/I_B ≈ 10.

Use Value: V_CE(sat) ≤ −0.25 V ensures <0.3 V drop across collector-emitter path, preserving negative rail integrity for downstream comparators.

Use Scenario: Driving LED anodes in multiplexed 7-segment displays powered from −12 V supply.

IC Role / Device Role / Timing Role: Low-side PNP current sink controlling segment current via base pulsed at 1 kHz.

Use Value: 125 MHz f_T and fast turn-off time (<100 ns) enable clean 1 kHz multiplexing without ghosting or brightness variation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP small-signal amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPSA71RLRMG	V_CEO = −60 V (vs. −40 V); otherwise identical pinout, h_FE, and package	Required where higher reverse voltage margin is needed in high-voltage analog front-ends	Select MPSA71RLRMG only if system rail exceeds −40 V; no layout change needed but may incur slight cost premium.
BC557BTA	h_FE = 200–450 (tighter bin), V_CEO = −45 V, same TO-92 package but different pinout (E-C-B)	Preferred for matched-pair differential inputs due to tighter h_FE distribution	Requires PCB layout revision due to reversed collector/emitter pin assignment; verify bias network compatibility before substitution.

Compared with MPSA71RLRMG, the MPSA70RLRMG offers lower voltage rating but identical noise and gain behavior at reduced cost; versus BC557BTA, it provides guaranteed E-B-C pinout and broader h_FE range, simplifying generic bias design at the expense of matching precision.

Availability

MPSA70RLRMG is available at Aetrix Electronics and suitable for audio preamplifier circuits, discrete bias networks, and level-shifting interfaces requiring stable component supply, RoHS compliance, and TO-92 through-hole compatibility.

Supply support for MPSA70RLRMG 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 specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The MPSA70RLRMG belongs to onsemi's legacy small-signal transistor product line, engineered for general-purpose linear amplification and switching in cost-sensitive, high-volume analog systems where reliability and manufacturability are critical.

FAQ

What is the maximum collector-emitter voltage rating for MPSA70RLRMG?

The MPSA70RLRMG has a maximum collector-emitter voltage rating (V_CEO) of −40 V DC. This value is specified at I_C = −1.0 mA with base open and represents the absolute maximum reverse-biased voltage the device can withstand before breakdown. Exceeding −40 V risks permanent damage, and design margins should maintain operation below −32 V in production circuits.

Does MPSA70RLRMG support low-noise audio applications?

Yes, the MPSA70RLRMG is characterized for low-noise operation with typical input noise voltage ≤10 nV/√Hz at 1 kHz and I_C = 1 mA. Its noise performance is validated in Figures 1–5 of the official datasheet, making it suitable for microphone preamplifiers, phono stages, and other sensitive analog front-ends where discrete transistor gain is preferred over op-amps.

What is the pin configuration of MPSA70RLRMG in TO-92 package?

The MPSA70RLRMG uses standard TO-92 pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector, when viewing the flat side of the package with leads pointing downward. This E-B-C arrangement is confirmed in the "MARKING DIAGRAM" and "PACKAGE DIMENSIONS" sections of the onsemi datasheet (Publication Order Number: MPSA70/D).

Can MPSA70RLRMG be used in switching applications?

Yes, the MPSA70RLRMG supports switching use with verified t_on < 50 ns and t_off < 100 ns at I_C/I_B = 10, V_CC = −3 V. Its V_CE(sat) ≤ −0.25 V at I_C = −10 mA ensures minimal conduction loss, and C_obo ≤ 4.0 pF limits switching-induced ringing-making it viable for low-power digital interface and LED multiplexing up to 100 kHz.

Is MPSA70RLRMG RoHS compliant and what does the 'G' suffix indicate?

Yes, the 'G' suffix in MPSA70RLRMG explicitly denotes Pb-free (RoHS-compliant) construction per onsemi's packaging standards. The device meets EU RoHS Directive 2011/65/EU and uses matte tin lead finish on TO-92 leads. Full compliance documentation, including test reports and material declarations, is available via onsemi's Quality Portal using the part number MPSA70RLRMG.

MPSA70RLRMG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-226-3, TO-92-3 Long Body, Formed Leads

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 40 V

Vce Saturation (Max) @ Ib, Ic:: 250mV @ 1mA, 10mA

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 5mA, 10V

Power - Max:: 625 mW

Frequency - Transition:: 125MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92 (TO-226)

MPSA70RLRMG FAQ

1.How can I place an order for MPSA70RLRMG through Aetrix?

Please submit a Request for Quotation (RFQ) for MPSA70RLRMG 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 MPSA70RLRMG reliable?

The price and inventory of MPSA70RLRMG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPSA70RLRMG is usually 5 days.

3.What payment methods are accepted for MPSA70RLRMG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPSA70RLRMG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPSA70RLRMG?

MPSA70RLRMG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPSA70RLRMG 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 MPSA70RLRMG?

For technical support, including MPSA70RLRMG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPSA70RLRMG requirements.

6.How does Aetrix verify that MPSA70RLRMG is sourced from the original manufacturer or authorized distributors?

All MPSA70RLRMG 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 MPSA70RLRMG meets industry standards.

7.What is the process for return or replacement of MPSA70RLRMG?

All MPSA70RLRMG units undergo pre-shipment inspection (PSI). If there is an issue with MPSA70RLRMG, 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 MPSA70RLRMG part is unused and in its original packaging.

Return procedure for MPSA70RLRMG:

1.Submit a request within 90 days.

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

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