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

STMicroelectronics MC33171N

Name: MC33171N
Brand: STMicroelectronics
SKU: MC33171N
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC33171N

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-DIP (0.300", 7.62mm)

Datasheet:: MC33171N.pdf

Description:: IC OPAMP GP 1 CIRCUIT 8DIP

Quantity:: RFQ Add To RFQ list

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Inventory:4,393

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Product details

Overview

MC33171N from STMicroelectronics is a single bipolar operational amplifier optimized for low-power, wide-supply operation in industrial signal conditioning. It delivers 2.1 MHz gain-bandwidth, 2 V/µs slew rate, and 200 µA supply current at ±15 V, with rail-to-rail input common-mode range extending to V_CC– and output swing within 100 mV of V_CC–. Used in 4–44 V single-supply sensor front-ends and precision comparators.

For engineers reviewing the MC33171N datasheet, MC33171N pinout, MC33171N application, or MC33171N equivalent, key selection criteria include its 200 µA quiescent current, ±22 V max supply, 80 dB CMRR, 1.6–2 V/µs slew rate, and DIP-8 package compatibility with legacy op-amp footprints.

Technical Context

The MC33171N employs a bipolar input stage with complementary NPN/PNP differential pair, enabling rail-to-rail input common-mode operation down to V_CC–. Its internal offset null circuit (pins 1 & 5) supports precise DC accuracy without external trimming resistors.

It features a Class AB output stage delivering ±13.3 V output swing into 10 kΩ at ±15 V supply, with phase margin of 45° ensuring stable unity-gain operation. Input bias current remains below 200 nA over –40°C to +105°C, supporting high-impedance source interfacing.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	+4 V to +44 V single supply or ±2 V to ±22 V dual supply - enables direct interface with 5 V, 12 V, 24 V, and 48 V industrial rails
Quiescent Current	200 µA typical at +5 V - allows battery-powered or energy-constrained designs with minimal self-heating
Gain-Bandwidth Product	2.1 MHz typical - supports closed-loop bandwidth up to ~200 kHz at gain = 10 without instability
Slew Rate	2 V/µs typical - sufficient for 10 kHz full-scale sine wave output at 20 V_PP without distortion
Input Common-Mode Range	V_CC– to (V_CC+ − 2.2 V) - permits single-supply operation with ground-referenced inputs and sensors
Output Voltage Swing	Within 100 mV of V_CC–, 1.3 V above V_CC– at +5 V supply - maximizes dynamic range in low-voltage systems
CMRR / PSRR	80 dB min - rejects power supply ripple and common-mode noise in noisy industrial environments

Pinout & Package

MC33171N is housed in an 8-pin plastic DIP (Dual In-line Package), compliant with JEDEC MS-001. The package has 0.3-inch body width, 2.54 mm lead pitch, and through-hole mounting compatibility.

Pin/Terminal	Circuit Role	Design Meaning
1	Offset Null 1	Connects to one terminal of external 10 kΩ potentiometer for input offset voltage trimming
2	Inverting Input (−)	Differential input node for feedback configuration; accepts signals down to V_CC–
3	Non-inverting Input (+)	Differential input node; supports common-mode voltages from V_CC– to V_CC+ − 2.2 V
4	V_CC–	Negative supply rail connection; required even in single-supply mode (tied to ground)
5	Offset Null 2	Connects to other terminal of same 10 kΩ potentiometer used at pin 1 for balanced nulling
6	Output	Class AB push-pull output capable of sourcing/sinking ≥6 mA; swings within 100 mV of V_CC–
7	V_CC+	Positive supply rail; supports up to +44 V or ±22 V operation
8	No Connect	Internally unconnected; must remain floating - no external tie or loading permitted

Key Features

Feature	Design Value
Rail-to-rail input common-mode range	Operates with inputs at V_CC–, eliminating need for level-shifting in single-supply sensor interfaces
Low quiescent current	200 µA enables multi-channel analog front-ends on shared 5 V or 12 V rails without thermal derating
High supply voltage tolerance	±22 V rating supports direct integration into 24 V PLC I/O modules and motor control feedback paths
Internal offset null terminals	Pins 1 & 5 allow <1 mV residual offset after calibration - critical for precision DC amplification
Stable unity-gain operation	45° phase margin ensures reliable performance in transimpedance and active filter configurations

Applications

Industrial Sensor Signal Conditioning

4–20 mA Loop Receiver

Use Scenario: Amplifying low-level mV outputs from RTDs, thermocouples, and strain gauges in factory-floor temperature and pressure monitoring systems.

IC Role / Device Role / Timing Role: Precision DC-coupled non-inverting amplifier with adjustable gain and offset nulling capability.

Use Value: Input common-mode range to V_CC– allows direct grounding of sensor return, simplifying PCB layout and reducing error from ground loops.

Use Scenario: Converting 4–20 mA current loop signals to 0–5 V or 0–10 V voltage outputs for ADC interfacing in programmable logic controllers.

IC Role / Device Role / Timing Role: Transimpedance amplifier with precision gain-setting resistor and buffered output stage.

Use Value: 200 µA supply current minimizes loop power consumption while maintaining 2.1 MHz bandwidth for fast response to step changes in process variables.

Single-Supply Battery Monitoring

Legacy Op-Amp Drop-in Replacement

Use Scenario: Monitoring cell voltage and pack voltage in 12 V and 24 V lead-acid or LiFePO₄ battery systems with microcontroller ADCs.

IC Role / Device Role / Timing Role: High-impedance voltage follower and level-shifter for scaling battery voltage to ADC reference range.

Use Value: Output swing within 100 mV of ground enables full utilization of 0–3.3 V or 0–5 V ADC input range without negative supply rail.

Use Scenario: Replacing obsolete µA741 or LM301A in existing DIP-8-based test equipment and instrumentation designs.

IC Role / Device Role / Timing Role: Pin-compatible general-purpose op-amp with improved speed, lower power, and wider supply range.

Use Value: Identical pinout and footprint allows board-level replacement without layout revision, while gaining 2× bandwidth and 5× lower supply current.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM324N	Higher supply current (1.2 mA), lower GBW (1.2 MHz), no offset null pins	Lacks precision nulling capability; less suitable for DC-critical sensor amps	Prefer MC33171N where offset drift ≤10 µV/°C and <1 mV post-calibration are required
TL071CP	JFET input (lower I_ib = 65 pA), higher V_io (10 mV), no rail-to-rail input	Better for high-Z sources but incompatible with V_in = 0 V in single-supply mode	Choose TL071CP only when ultra-low input bias current outweighs need for ground-referenced input operation

Compared with LM324N and TL071CP, MC33171N uniquely combines rail-to-rail input, 200 µA supply current, and dedicated offset null pins - making it optimal for precision, low-power, single-supply industrial signal chains where ground-referenced sensing and long-term DC stability are mandatory.

Availability

MC33171N is available at Aetrix Electronics and suitable for industrial sensor interfaces, 4–20 mA loop receivers, and battery voltage monitors requiring stable component supply across extended temperature ranges (–40°C to +105°C).

Supply support for MC33171N 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, Switzerland, designing and manufacturing analog, power, MCU, and sensor solutions for automotive, industrial, and consumer markets.

The MC3x171 series was developed specifically for industrial signal conditioning applications demanding low power, wide supply voltage tolerance, and robust DC precision under harsh ambient conditions.

FAQ

Can MC33171N operate from a single 5 V supply?

Yes. MC33171N supports single-supply operation from +4 V to +44 V. At +5 V, it delivers 200 µA supply current, input common-mode range from ground to +2.8 V, and output swing from 100 mV above ground to 3.5 V - fully compatible with 3.3 V or 5 V microcontroller ADCs.

What is the purpose of pins 1 and 5 on MC33171N?

Pins 1 and 5 are dedicated offset null terminals. Connecting a 10 kΩ potentiometer between them, with its wiper tied to V_CC–, allows manual adjustment of input offset voltage to <1 mV - essential for precision DC amplification in sensor front-ends and instrumentation.

Does MC33171N require external compensation?

No. MC33171N is internally compensated for unity-gain stability. Its 45° phase margin ensures stable operation with capacitive loads up to 100 pF and resistive feedback networks - no external compensation capacitor is needed in standard configurations.

Is MC33171N pin-compatible with standard DIP-8 op-amps?

Yes. MC33171N uses industry-standard DIP-8 pinout: pin 2 (−IN), pin 3 (+IN), pin 4 (V_CC–), pin 6 (OUT), pin 7 (V_CC+). Pins 1 and 5 provide offset nulling not found on µA741 or LM324, but unused pins remain harmless when left open in legacy designs.

MC33171N Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

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:: Through Hole

Supplier Device Package:: 8-DIP

MC33171N FAQ

1.How can I place an order for MC33171N through Aetrix?

Please submit a Request for Quotation (RFQ) for MC33171N 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 MC33171N reliable?

The price and inventory of MC33171N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33171N is usually 5 days.

3.What payment methods are accepted for MC33171N?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33171N transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC33171N?

MC33171N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC33171N 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 MC33171N?

For technical support, including MC33171N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33171N requirements.

6.How does Aetrix verify that MC33171N is sourced from the original manufacturer or authorized distributors?

All MC33171N 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 MC33171N meets industry standards.

7.What is the process for return or replacement of MC33171N?

All MC33171N units undergo pre-shipment inspection (PSI). If there is an issue with MC33171N, 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 MC33171N part is unused and in its original packaging.

Return procedure for MC33171N:

1.Submit a request within 90 days.

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

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