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

STMicroelectronics MC33171D

Name: MC33171D
Brand: STMicroelectronics
SKU: MC33171D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC33171D

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

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

Datasheet:: MC33171D.pdf

Description:: IC OPAMP GP 1 CIRCUIT 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:1,600

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Product details

Overview

MC33171D 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. above V_CC–), with 200 µA supply current, 2.1 MHz gain-bandwidth product, and ±22 V dual-supply or +4 V to +44 V single-supply operation. It serves as a general-purpose precision amplifier in sensor signal conditioning and industrial analog front-ends.

For engineers reviewing the MC33171D datasheet, MC33171D pinout, MC33171D application, or MC33171D equivalent, key selection criteria include its input common-mode range extending to V_CC–, low quiescent current under wide supply conditions, and compatibility with legacy DIP-8 op-amp footprints in SO-8 packaging.

Technical Context

The MC33171D implements a bipolar input stage with internal offset nulling circuitry (pins 1 and 5), enabling stable DC performance across temperature. Its input common-mode range spans V_CC– to (V_CC+ – 2.2 V), supporting true single-supply operation down to +4 V while maintaining 80 dB CMRR and 80 dB PSRR.

Output stage delivers asymmetric drive capability: 3 mA source / 15 mA sink short-circuit current, with 2 V/µs slew rate and 45° phase margin into 10 kΩ || 100 pF, ensuring stability in unity-gain buffer and active filter configurations without external compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Current	200 µA typical at +5 V single supply - enables battery-powered sensor nodes with >1-year runtime on coin cell
Gain-Bandwidth Product	2.1 MHz - supports closed-loop bandwidth up to ~200 kHz at gain = 10 without instability
Slew Rate	2 V/µs - sufficient for 100 kHz sine wave output at 2 V_PP without distortion
Input Common-Mode Range	V_CC– to (V_CC+ – 2.2 V) - allows direct interfacing with 0–5 V sensors in single-supply systems
Output Low Voltage	100 mV typical above V_CC– at 10 kΩ load - ensures TTL/CMOS logic-level compatibility when V_CC– = GND
Input Offset Voltage	1 mV typical at ±15 V, 4.5 mV max over full temperature - suitable for 12-bit ADC front-end with <0.5 LSB error
Common-Mode Rejection	80 dB minimum - rejects 10 mV of power-supply ripple coupled onto differential sensor inputs

Pinout & Package

MC33171D uses an 8-pin SO (Small Outline) plastic micropackage (SO-8), 3.9 × 4.9 mm body, 1.27 mm pitch, with gull-wing leads. Pin 1 is bottom-left corner (marking dot adjacent), pin numbering counterclockwise.

Pin/Terminal	Circuit Role	Design Meaning
1	Offset Null 1	Connects to internal NPN emitter node; used with pin 5 and external 10 kΩ potentiometer to trim input offset voltage
2	Inverting Input	Differential input terminal with 20 nA typical bias current; accepts signals referenced to V_CC–
3	Non-inverting Input	Differential input terminal matched to pin 2; supports common-mode voltages down to V_CC–
4	V_CC–	Negative supply rail connection; also serves as reference for input common-mode and output swing
5	Offset Null 2	Connects to internal PNP emitter node; completes offset adjustment network with pin 1
6	Output	Class AB push-pull output capable of sourcing 3 mA / sinking 15 mA into resistive loads
7	V_CC+	Positive supply rail; supports up to +44 V in single-supply mode or ±22 V in dual-supply mode
8	No Connect	Internally unconnected; must remain floating - no external tie required

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 at +5 V enables use in always-on industrial monitoring nodes without thermal derating
Internal offset null terminals	Pins 1 and 5 allow <10 µV residual offset after trimming - critical for precision DC amplification
Wide supply voltage range	+4 V to +44 V single supply or ±2 V to ±22 V dual supply - supports legacy 24 V PLC I/O and modern 5 V microcontroller systems
Stable unity-gain operation	45° phase margin into 10 kΩ \|\| 100 pF ensures reliable buffer use without external compensation components

Applications

Industrial Sensor Signal Conditioning

4–20 mA Loop Receiver

Use Scenario: Amplifying low-level mV outputs from RTDs, thermocouples, or strain gauges in factory-floor transmitters.

IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with offset trimming, referenced to system ground or isolated supply rail.

Use Value: 1 mV typical input offset and 80 dB CMRR preserve sub-0.1% measurement accuracy despite EMI and supply noise.

Use Scenario: Converting 4–20 mA loop current to 0.2–1 V or 1–5 V voltage for ADC input in process controllers.

IC Role / Device Role / Timing Role: Transimpedance amplifier with programmable gain and rail-to-rail input to accommodate loop drop variations.

Use Value: Input common-mode range to V_CC– allows direct sensing of current through shunt resistor tied to ground or negative rail.

Battery-Powered Data Loggers

Legacy Op-Amp Drop-in Replacement

Use Scenario: Signal amplification and filtering in portable environmental monitors powered by CR2032 or AA cells.

IC Role / Device Role / Timing Role: Low-power analog front-end stage operating from 3.3 V or 5 V with minimal self-heating.

Use Value: 200 µA supply current extends battery life beyond 2 years in periodic-sampling designs with sleep-mode MCU.

Use Scenario: Upgrading obsolete µA741 or LM324-based circuits without PCB redesign.

IC Role / Device Role / Timing Role: Pin-compatible SO-8 replacement for DIP-8 sockets using adapter or direct SO-8 footprint.

Use Value: Identical pinout (1–8) and electrical behavior enable drop-in substitution while improving speed (2.1 MHz vs. 1 MHz) and power (200 µA vs. 1.8 mA).

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM324DR	Higher supply current (1.4 mA), lower GBW (1.2 MHz), no offset null pins	Lacks precision trimming capability; unsuitable for sub-mV DC accuracy requirements	Choose when cost is primary constraint and offset drift <5 mV is acceptable
TLV2461CDR	Rail-to-rail I/O, 600 µA supply, 6.4 MHz GBW, no offset null	Superior AC performance but no external offset adjustment - limits ultra-low-drift DC use	Prefer for higher-speed signal chains where trimming is unnecessary and supply budget allows

Compared with LM324DR and TLV2461CDR, MC33171D uniquely balances ultra-low quiescent current, external offset adjustability, and robust single-supply operation - making it optimal for precision, low-power industrial analog stages where long-term DC stability is mandatory.

Availability

MC33171D is available at Aetrix Electronics and suitable for industrial sensor interfaces, 4–20 mA loop receivers, and battery-powered data loggers requiring stable component supply across extended temperature ranges (–40°C to +105°C).

Supply support for MC33171D 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, microcontroller, power, and MEMS products for industrial, automotive, and consumer markets.

The MC3x171 series was developed specifically for low-power, wide-supply industrial op-amp applications - emphasizing rail-to-rail input capability, external offset trimming, and robustness across –40°C to +105°C ambient operation.

FAQ

Can MC33171D operate from a single 3.3 V supply?

No. The absolute minimum single-supply voltage is +4 V per maximum ratings table. At 3.3 V, internal transistor biasing fails, resulting in undefined output behavior and potential phase reversal. For 3.3 V systems, consider rail-to-rail CMOS op-amps like TS912 or MCP6001 with verified 1.8–5.5 V operation.

What is the purpose of pins 1 and 5 (Offset Null)?

Pins 1 and 5 connect to internal emitter nodes of the input differential pair. A 10 kΩ potentiometer between them, with wiper to V_CC–, injects balancing current to reduce input offset voltage to <10 µV. This is essential for precision DC amplification where offset drift would otherwise dominate error budget.

Is MC33171D pin-compatible with LM358 in SO-8 package?

No. LM358 uses different pinout: pin 1 = output A, pin 2 = inverting input A, pin 3 = non-inverting input A, pin 4 = V_CC–, whereas MC33171D assigns pin 1 to Offset Null 1 and pin 6 to output. Direct replacement requires PCB modification or adapter.

Does MC33171D require external compensation capacitors?

No. The device is internally compensated for unity-gain stability. Electrical characteristics specify 45° phase margin into 10 kΩ || 100 pF, confirming stable operation as a voltage follower or in standard inverting/non-inverting configurations without added capacitors.

MC33171D Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

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:: Surface Mount

Supplier Device Package:: 8-SOIC

MC33171D FAQ

1.How can I place an order for MC33171D through Aetrix?

Please submit a Request for Quotation (RFQ) for MC33171D 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 MC33171D reliable?

The price and inventory of MC33171D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33171D is usually 5 days.

3.What payment methods are accepted for MC33171D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33171D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC33171D?

MC33171D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC33171D 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 MC33171D?

For technical support, including MC33171D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33171D requirements.

6.How does Aetrix verify that MC33171D is sourced from the original manufacturer or authorized distributors?

All MC33171D 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 MC33171D meets industry standards.

7.What is the process for return or replacement of MC33171D?

All MC33171D units undergo pre-shipment inspection (PSI). If there is an issue with MC33171D, 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 MC33171D part is unused and in its original packaging.

Return procedure for MC33171D:

1.Submit a request within 90 days.

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

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