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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

STMicroelectronics MC33171DT

Name: MC33171DT
Brand: STMicroelectronics
SKU: MC33171DT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC33171DT

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: MC33171DT.pdf

Description:: IC OPAMP GP 1 CIRCUIT 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:10,572

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Product details

Overview

MC33171DT from STMicroelectronics is a single bipolar operational amplifier optimized for low-power, rail-to-rail input (down to V_CC–) and near-rail output swing (V_OL = 100 mV typ. at V_CC–), with 200 µA supply current, 2.1 MHz gain-bandwidth product, and 2 V/µs slew rate. It operates from single +4V to +44V or dual ±2V to ±22V supplies and is used in industrial sensor signal conditioning where supply headroom is constrained.

For engineers reviewing the MC33171DT datasheet, MC33171DT pinout, MC33171DT application, or MC33171DT equivalent, key selection criteria include its input common-mode range extending to V_CC–, low quiescent current under wide supply voltage, and SO-8 packaging suitable for space-constrained analog front-ends.

Technical Context

The MC33171DT integrates a bipolar input stage with offset null terminals (pins 1 and 5), enabling precise DC accuracy in precision amplification. Its internal architecture supports stable operation with capacitive loads up to 100 pF and maintains ≥45° phase margin across temperature.

It delivers rail-to-rail input common-mode range (V_ICM = V_CC– to V_CC+ – 2.2 V) and low-level output voltage as low as 100 mV above V_CC– at 10 kΩ load - critical for single-supply interfacing with microcontroller ADCs or transducer bridges.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Current	200 µA typical - enables battery-powered or energy-harvesting sensor nodes with multi-year runtime
Gain-Bandwidth Product	2.1 MHz - supports bandwidth-critical applications like 4–20 mA loop receivers up to ~200 kHz
Slew Rate	2 V/µs - ensures faithful reproduction of fast step inputs without distortion in control feedback paths
Input Common-Mode Range	V_CC– to V_CC+ – 2.2 V - allows direct sensing of ground-referenced signals in single-supply systems
Output Low Voltage	100 mV typical above V_CC– - minimizes headroom loss when driving low-voltage logic or ADC reference points
Input Offset Voltage	1 mV typical at ±15 V - reduces DC error in high-gain instrumentation stages without trimming
CMRR / PSRR	100 dB each - rejects power supply ripple and common-mode noise in noisy industrial environments

Pinout & Package

MC33171DT uses an 8-pin SO (Small Outline) plastic micropackage (SO-8), compliant with JEDEC MS-012, with 1.27 mm pitch and gull-wing leads.

Pin/Terminal	Circuit Role	Design Meaning
1	Offset Null 2	Second terminal of external 10 kΩ potentiometer for input offset voltage trimming
2	Inverting Input	High-impedance node accepting feedback network for stable closed-loop gain configuration
3	Non-inverting Input	DC-coupled input accepting sensor or reference voltage with rail-to-rail common-mode support
4	V_CC–	Negative supply or ground connection; defines lower bound of input/output voltage range
5	Offset Null 1	First terminal of external 10 kΩ potentiometer; paired with pin 1 for precision nulling
6	Output	Class-AB output stage capable of sourcing/sinking ±27 mA into 10 kΩ load
7	V_CC+	Positive supply rail; supports up to +44 V single-supply or ±22 V dual-supply operation
8	No Connect	Internally unused; must remain unconnected per manufacturer specification

Key Features

Feature	Design Value
Rail-to-rail input common-mode range	Extends to V_CC–, enabling direct interface with grounded sensors and single-supply transducers
Low quiescent current	200 µA typical ensures minimal self-heating and extended battery life in portable instrumentation
Offset voltage trim capability	Dual null pins (1 & 5) allow <100 µV residual offset after calibration for precision measurement
Wide supply voltage range	+4 V to +44 V single supply or ±2 V to ±22 V dual supply accommodates legacy and industrial rails
Stable with capacitive loads	Guaranteed phase margin ≥45° with 100 pF load supports direct driving of long traces or ADC input capacitance

Applications

Industrial 4–20 mA Loop Receiver

Single-Supply Temperature Sensor Interface

Use Scenario: Converting 4–20 mA current loop signals to 0–5 V voltage for microcontroller ADC sampling in PLC I/O modules.

IC Role / Device Role / Timing Role: Transimpedance amplifier with precision gain-setting and offset compensation.

Use Value: Input common-mode range down to V_CC– allows direct shunt-based current sensing without level-shifting circuitry.

Use Scenario: Amplifying output of PT100 or thermistor bridges operating from a +5 V rail in HVAC sensor nodes.

IC Role / Device Role / Timing Role: Low-drift, low-power signal conditioner with adjustable offset for cold-junction compensation.

Use Value: 200 µA supply current and rail-compatible inputs reduce system power budget while maintaining 12-bit effective resolution.

DC Motor Current Sense Amplifier

Programmable Logic Controller Analog Input Stage

Use Scenario: High-side or low-side current monitoring in brushed DC motor drivers using shunt resistors.

IC Role / Device Role / Timing Role: Differential amplifier with matched internal resistors or external gain configuration for bidirectional sensing.

Use Value: Output swing within 100 mV of V_CC– preserves dynamic range when interfacing with 3.3 V ADC references.

Use Scenario: Signal conditioning for multiple analog field inputs (voltage, current, thermocouple) in modular PLC backplanes.

IC Role / Device Role / Timing Role: General-purpose op-amp in programmable gain stages and filter sections.

Use Value: ±22 V dual-supply rating and 100 dB CMRR suppress noise from shared industrial power rails and relay switching transients.

Equivalent & Alternatives

The following parts are listed as comparable options for similar single low-power bipolar operational amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM321DR	Higher supply current (400 µA), lower GBP (1 MHz), no offset null pins	Lacks precision trimming capability; less suitable for sub-mV DC accuracy requirements	Preferred where cost sensitivity outweighs offset stability needs
TL071CP	JFET input (lower I_ib = 65 pA), higher V_io (3 mV), no rail-to-rail input	Cannot accept inputs near V_CC–; unsuitable for ground-referenced sensor interfaces	Chosen when ultra-low input bias current is required over common-mode range

Compared with LM321DR and TL071CP, MC33171DT uniquely combines rail-to-rail input, offset trimming, and 200 µA consumption - making it optimal for precision, low-power, single-supply industrial analog front-ends where DC accuracy and supply flexibility are jointly critical.

Availability

MC33171DT is available at Aetrix Electronics and suitable for industrial sensor interfaces, 4–20 mA loop receivers, and programmable logic controller analog input stages requiring stable component supply across extended temperature and voltage ranges.

Supply support for MC33171DT 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The MC3x171 series was developed specifically for industrial signal conditioning applications demanding low power, wide supply range, and robust DC precision - targeting legacy and new-design analog front-ends in harsh environments.

FAQ

What is the maximum recommended capacitive load for MC33171DT?

The MC33171DT is characterized for stable operation with up to 100 pF capacitive load while maintaining ≥45° phase margin. Driving larger capacitive loads (e.g., >200 pF) may cause peaking or oscillation unless isolated with a series resistor or compensated via external feedback network adjustments.

Can MC33171DT operate from a +3.3 V single supply?

No - the absolute minimum single-supply voltage is +4 V per the datasheet's operating conditions. At +3.3 V, internal transistor biasing fails, resulting in undefined output behavior, reduced gain, and potential thermal instability. Use +5 V or higher for guaranteed functionality.

How do the offset null pins (1 and 5) function in practice?

Pins 1 and 5 connect to opposite ends of a 10 kΩ potentiometer; the wiper connects to V_CC–. Adjusting the potentiometer balances internal input stage mismatches, reducing input offset voltage to <100 µV. This is essential for high-gain DC-coupled stages where offset drift dominates error budget.

Is MC33171DT pin-compatible with standard SO-8 op-amps like LM358?

No - MC33171DT has a unique pinout: pin 4 is V_CC–, pin 7 is V_CC+, and pins 1 & 5 are offset null terminals. LM358 uses pin 4 as V_CC– but lacks null pins and places V_CC+ on pin 8. Direct replacement requires PCB redesign and layout revision.

MC33171DT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Amplifier Type:: General Purpose

Number of Circuits:: 1

Output Type:: -

Slew Rate:: 2V/µs

Gain Bandwidth Product:: 2.1 MHz

-3db Bandwidth:: -

Current - Input Bias:: 20 nA

Voltage - Input Offset:: 1 mV

Current - Supply:: 220µA

Current - Output / Channel:: 27 mA

Voltage - Supply Span (Min):: 4 V

Voltage - Supply Span (Max):: 44 V

Operating Temperature:: -40°C ~ 105°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

MC33171DT FAQ

1.How can I place an order for MC33171DT through Aetrix?

Please submit a Request for Quotation (RFQ) for MC33171DT 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 MC33171DT reliable?

The price and inventory of MC33171DT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33171DT is usually 5 days.

3.What payment methods are accepted for MC33171DT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33171DT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC33171DT?

MC33171DT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC33171DT 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 MC33171DT?

For technical support, including MC33171DT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33171DT requirements.

6.How does Aetrix verify that MC33171DT is sourced from the original manufacturer or authorized distributors?

All MC33171DT 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 MC33171DT meets industry standards.

7.What is the process for return or replacement of MC33171DT?

All MC33171DT units undergo pre-shipment inspection (PSI). If there is an issue with MC33171DT, 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 MC33171DT part is unused and in its original packaging.

Return procedure for MC33171DT:

1.Submit a request within 90 days.

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

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