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

STMicroelectronics MC33172D

Name: MC33172D
Brand: STMicroelectronics
SKU: MC33172D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC33172D

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

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

Datasheet:: MC33172D.pdf

Description:: IC OPAMP GP 2 CIRCUIT 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:1,569

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Product details

Overview

MC33172D from STMicroelectronics is a low-power dual bipolar operational amplifier designed for single- or dual-supply operation across +4 V to +44 V (±2 V to ±22 V), featuring 200 µA supply current per amplifier, 2.1 MHz gain-bandwidth product, and rail-to-rail input common-mode range extending to V_CC–. It delivers 2 V/µs slew rate and 100 mV typical low-level output voltage near V_CC–, enabling use in industrial sensor signal conditioning and 24 V PLC analog front-ends.

For engineers reviewing the MC33172D datasheet, MC33172D pinout, MC33172D application, or MC33172D equivalent, key selection criteria include its bipolar input stage with 20 nA typical input bias current, wide supply range compatibility, thermal resistance of 125 °C/W (SO-8), and guaranteed operation from –40 °C to +105 °C.

Technical Context

The MC33172D implements a classic bipolar input stage with complementary NPN/PNP differential pairs, supporting rail-to-rail input common-mode operation down to V_CC–. Its internal compensation ensures stable unity-gain operation with ≥45° phase margin at 100 pF load.

It uses a Class AB output stage delivering ±27 mA sink/source capability and achieves 120 dB channel separation, making it suitable for dual-channel signal processing where crosstalk immunity is critical-e.g., differential sensor amplification or dual-channel active filtering.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	+4 V to +44 V (single) or ±2 V to ±22 V (dual) - supports direct interfacing with 24 V industrial rails and legacy ±15 V systems
Quiescent Current	200 µA per amplifier - enables battery-powered or energy-constrained designs without sacrificing bandwidth
Gain-Bandwidth Product	2.1 MHz - sufficient for anti-aliasing filters up to ~200 kHz and precision DC-coupled amplification
Slew Rate	2 V/µs - ensures faithful reproduction of signals with <500 ns rise time into 10 kΩ loads
Input Offset Voltage	6.5 mV max - sets baseline accuracy limit for 12-bit ADC interfaces with gain ≤10
Common-Mode Rejection	100 dB - suppresses noise on shared sensor grounds in noisy industrial environments
Output Voltage Swing	V_OL = 0.15 V (typ.) above V_CC– - allows full-scale output in single-supply 5 V systems with headroom for ADC reference

Pinout & Package

MC33172D is housed in an SO-8 plastic micropackage (JEDEC MS-012AC), 5.0 mm × 6.2 mm body, 1.27 mm pitch, with exposed pad not electrically connected.

Pin/Terminal	Circuit Role	Design Meaning
1	Inverting Input (Amplifier 1)	High-impedance node accepting feedback network for inverting configuration; referenced to V_CC–
2	Non-inverting Input (Amplifier 1)	Accepts sensor or reference signal; common-mode range includes V_CC– for ground-referenced sources
3	Output (Amplifier 1)	Class AB stage capable of sourcing/sinking ±27 mA; drives 10 kΩ loads to within 0.15 V of rails
4	V_CC–	Negative supply or ground reference; all inputs and outputs referenced to this node
5	Inverting Input (Amplifier 2)	Independent second channel input; no internal coupling - supports dual independent signal paths
6	Non-inverting Input (Amplifier 2)	Second channel positive input; identical electrical specs to Pin 2
7	Output (Amplifier 2)	Second independent output; 120 dB channel separation prevents crosstalk in multi-channel monitoring
8	V_CC+	Positive supply rail; supports up to +44 V, enabling direct connection to unregulated 24 V bus

Key Features

Feature	Design Value
Rail-to-rail input common-mode range	Extends to V_CC–, allowing direct interface with ground-referenced sensors and single-supply transducer outputs
Low quiescent current	200 µA per amplifier enables >1-year battery life in 2-wire loop-powered field instruments
Wide supply voltage range	+4 V to +44 V supports both modern 5 V microcontroller domains and legacy 24 V industrial control buses
High channel separation	120 dB prevents interference between dual channels used for differential sensing or redundant signal paths
Industrial temperature grade	–40 °C to +105 °C operation validated for deployment in motor control cabinets and outdoor metering enclosures

Applications

Industrial Sensor Signal Conditioning

24 V PLC Analog Input Modules

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

IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier front-end with matched gain stages and rail-to-rail input for offset calibration.

Use Value: 200 µA per channel minimizes self-heating error in precision RTD bridges; 100 dB CMRR rejects common-mode noise from 50/60 Hz AC mains coupling.

Use Scenario: Scaling and buffering 0–10 V or 4–20 mA process signals before ADC sampling in programmable logic controllers.

IC Role / Device Role / Timing Role: Single-supply signal conditioner operating from 24 V bus, providing level-shifted, buffered outputs compatible with SAR ADC references.

Use Value: Output swing to within 0.15 V of V_CC– (ground) ensures full utilization of 0–10 V ADC input range without external negative rail.

Dual-Channel Active Filters

Low-Power Battery Monitoring

Use Scenario: Implementing twin 2nd-order Sallen-Key low-pass filters for anti-aliasing in dual-channel data acquisition systems.

IC Role / Device Role / Timing Role: Dual op-amp core providing unity-gain stable, low-noise filtering with minimal board space.

Use Value: 2.1 MHz GBP and 45° phase margin ensure predictable filter response without peaking; SO-8 footprint saves PCB area vs. two discrete SOIC-8 op-amps.

Use Scenario: Monitoring individual cell voltages in 4S Li-ion battery packs for portable medical devices with strict power budgets.

IC Role / Device Role / Timing Role: Low-quiescent dual amplifier performing differential cell voltage measurement and overvoltage flag generation.

Use Value: 200 µA total supply current extends runtime in sleep mode; –40 °C to +105 °C rating covers automotive-grade battery enclosure temperatures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2904DR	Higher I_ib (200 nA typ.), lower GBP (1.2 MHz), same SO-8 package	Limited bandwidth restricts use in >100 kHz filtering; higher input current increases error with high-Z sources	Select when cost is primary and bandwidth <100 kHz suffices; avoid for precision sensor front-ends with >100 kΩ source impedance
TLV2462IDR	Rail-to-rail output (not input), 600 µA/I_A, 6.4 MHz GBP, CMOS input (0.5 pA I_ib)	CMOS input eliminates bias current error but requires V_CC– +1.5 V minimum common-mode - incompatible with true ground-sensing	Prefer for ultra-low I_ib applications with mid-rail common-mode; reject when input must reach V_CC–

Compared with LM2904DR and TLV2462IDR, MC33172D uniquely balances rail-to-rail input capability, bipolar low-noise performance, and sub-250 µA power - making it optimal for ground-referenced industrial sensors where both input range and quiescent power are constrained.

Availability

MC33172D is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, 24 V PLC analog input modules, and dual-channel active filters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC33172D 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing and broad analog portfolio coverage.

The MC33172 series belongs to ST's general-purpose bipolar op-amp product line, engineered specifically for industrial automation and process control applications demanding robustness, wide supply flexibility, and reliable performance under harsh ambient conditions.

FAQ

What is the maximum capacitive load the MC33172D can drive while maintaining stability?

The MC33172D is internally compensated for unity-gain stability with up to 100 pF capacitive load, as verified in the datasheet's phase margin test condition (RL = 10 kΩ, CL = 100 pF, φm ≥ 45°). Driving larger loads requires external isolation resistor (≥100 Ω) in series with the output to prevent oscillation.

Can the MC33172D operate with a single 5 V supply and still achieve rail-to-rail input?

Yes - the input common-mode voltage range extends to V_CC– (ground), so with V_CC+ = 5 V and V_CC– = 0 V, inputs may swing from 0 V to 3.2 V (V_CC+ − 1.8 V). This allows direct connection to 0–3.3 V microcontroller GPIOs or ground-referenced sensors without level-shifting.

How does the MC33172D's input offset voltage drift compare to CMOS op-amps?

MC33172D exhibits 10 µV/°C input offset drift - typical of bipolar processes - which is higher than precision CMOS op-amps (<1 µV/°C) but lower than many general-purpose bipolar alternatives (>20 µV/°C). For applications requiring <100 µV total drift over 85 °C, external trimming or auto-zero architecture is recommended.

Is the SO-8 package of MC33172D lead-free and RoHS-compliant?

Yes - MC33172D is supplied in an ECOPACK®-compliant SO-8 package with lead-free second-level interconnect, fully conforming to RoHS Directive 2011/65/EU. The "ECOPACK" marking appears on the package and inner box label, and JEDEC JESD97-compliant soldering profiles apply.

MC33172D Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tube

Product Status:: Active

Amplifier Type:: General Purpose

Number of Circuits:: 2

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

MC33172D FAQ

1.How can I place an order for MC33172D through Aetrix?

Please submit a Request for Quotation (RFQ) for MC33172D 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 MC33172D reliable?

The price and inventory of MC33172D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33172D is usually 5 days.

3.What payment methods are accepted for MC33172D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33172D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC33172D?

MC33172D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC33172D 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 MC33172D?

For technical support, including MC33172D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33172D requirements.

6.How does Aetrix verify that MC33172D is sourced from the original manufacturer or authorized distributors?

All MC33172D 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 MC33172D meets industry standards.

7.What is the process for return or replacement of MC33172D?

All MC33172D units undergo pre-shipment inspection (PSI). If there is an issue with MC33172D, 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 MC33172D part is unused and in its original packaging.

Return procedure for MC33172D:

1.Submit a request within 90 days.

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

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