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STMicroelectronics LM158QT
- Part No.:
- LM158QT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
LM158QT.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,496
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Product details
Overview
LM158QT from STMicroelectronics is a low-power dual operational amplifier designed for single-supply operation across -55 °C to +125 °C, featuring 100 dB DC gain, 1.1 MHz unity-gain bandwidth, 2 mV input offset voltage (typ.), 20 nA input bias current (typ.), and rail-to-rail output swing down to 0 V. It enables transducer signal conditioning and DC gain blocks in industrial sensor interfaces and automotive subsystems.
For engineers reviewing the LM158QT datasheet, LM158QT pinout, LM158QT application, or LM158QT equivalent, this page delivers verified electrical specs, DFN8 2×2 package details, real-world use cases including single-supply instrumentation amplifiers and peak detectors, and validated alternative parts with documented functional trade-offs.
Technical Context
The LM158QT integrates two independent, internally frequency-compensated op amps optimized for stable operation from 3 V to 30 V single supply. Its input common-mode range extends to the negative rail, and output swings from 0 V to (VCC − 1.5 V), enabling ground-referenced sensing without level-shifting circuitry.
It uses PNP input stage topology for low input bias current (20 nA typ.) and temperature-compensated design for consistent 2 mV offset voltage and 7–15 µV/°C drift across its full operating temperature range. Channel separation exceeds 120 dB at 1–20 kHz, minimizing crosstalk in dual-channel signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 30 V single supply - supports direct interface with 5 V logic and wide industrial rails without regulation. |
| DC Voltage Gain | 100 dB - ensures high-precision amplification of low-level sensor signals with minimal error propagation. |
| Unity-Gain Bandwidth | 1.1 MHz - sufficient for audio-band filtering, active rectification, and moderate-speed control loops. |
| Input Offset Voltage | 2 mV (typ.) - enables accurate DC-coupled amplification in strain gauge and thermocouple front-ends. |
| Input Bias Current | 20 nA (typ.) - allows high-impedance source interfacing (e.g., pH electrodes, photodiodes) without significant loading. |
| Output Voltage Swing | 0 V to (VCC − 1.5 V) - delivers full dynamic range near ground, critical for single-supply ADC drivers. |
| Common-Mode Input Range | Includes VCC− (ground) - permits direct connection of grounded sensors without input biasing networks. |
Pinout & Package
LM158QT is housed in a 2 mm × 2 mm DFN8 package with wettable flanks, rated for −55 °C to +125 °C operation and qualified per industrial reliability standards. The exposed pad (Pin 5) must be soldered to PCB ground for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting input (Amplifier A) | Accepts differential input signal referenced to non-inverting input; supports AC/DC coupling configurations. |
| 2 | Non-inverting input (Amplifier A) | Reference node for A-channel; common-mode range includes ground, enabling true single-supply biasing. |
| 3 | Output (Amplifier A) | Delivers amplified signal with 40 mA source/sink capability; swing limited to 0 V–(VCC−1.5 V). |
| 4 | VCC− (Ground) | Power return path; serves as reference for both inputs and outputs; must be low-impedance. |
| 5 | Exposed thermal pad | Internally connected to ground; requires solder mask-defined land pattern and ≥90% solder coverage for thermal dissipation. |
| 6 | Non-inverting input (Amplifier B) | Independent reference for second channel; identical CMVR and bias characteristics as Pin 2. |
| 7 | Inverting input (Amplifier B) | Second differential input pair; electrically isolated from Channel A with >120 dB channel separation. |
| 8 | Output (Amplifier B) | Independent output stage; shares same supply rails and thermal constraints as Pin 3. |
Key Features
| Feature | Design Value |
|---|---|
| Internal frequency compensation | Enables stable unity-gain operation without external components - reduces BOM count and layout sensitivity. |
| Rail-to-rail output swing (down to 0 V) | Eliminates need for negative supply or level-shifting in single-supply data acquisition systems. |
| Low input bias current (20 nA typ.) | Preserves signal integrity when driving high-value feedback networks or interfacing with high-Z sources. |
| Wide temperature range (−55 °C to +125 °C) | Validated for under-hood automotive, industrial motor control, and outdoor sensor nodes without derating. |
| High channel separation (120 dB) | Prevents inter-channel interference in dual-sensor applications like differential pressure or bridge-based measurements. |
Applications
| Transducer Signal Conditioning | Single-Supply Instrumentation Amplifier |
|---|---|
|
Use Scenario: Amplifying mV-level outputs from load cells, RTDs, or thermopiles in factory automation PLC modules. IC Role / Device Role / Timing Role: Dual op amp configured as precision DC-coupled gain block with matched resistor networks for common-mode rejection. Use Value: 2 mV offset and 20 nA bias current minimize zero-point drift and gain error over temperature in unregulated 24 V systems. |
Use Scenario: Building 3-op-amp instrumentation amplifiers on space-constrained PCBs for medical ECG front-ends. IC Role / Device Role / Timing Role: Two LM158QT channels serve as input buffers; third function implemented via external discrete resistors and capacitor. Use Value: DFN8 2×2 footprint saves >60% board area vs. SO8 alternatives while maintaining 100 dB CMRR at DC. |
| Active Peak Detector | Low-Voltage Sensor Interface |
|
Use Scenario: Capturing transient voltage peaks from vibration sensors in predictive maintenance edge nodes. IC Role / Device Role / Timing Role: One channel acts as comparator-driven sample-and-hold; second provides buffer isolation for hold capacitor discharge control. Use Value: 1.1 MHz GBW and 0.3 V/µs slew rate support accurate capture of <100 µs pulses at 5 V supply. |
Use Scenario: Interfacing 0–100 mV oxygen sensor outputs to 12-bit SAR ADCs in portable gas analyzers. IC Role / Device Role / Timing Role: Non-inverting amplifier with 100× gain and DC-coupled input; second channel used for reference voltage buffering. Use Value: Input common-mode range including ground allows direct sensor grounding, eliminating offset errors from floating references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-power op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2904DT | Automotive-qualified (AEC-Q100), wider −40 °C to +105 °C range, 7 mV max offset (vs. 2 mV typ. for LM158QT), 300 V HBM ESD rating. | Required for passenger cabin modules; less suitable for extended-temperature industrial enclosures above +105 °C. | Select when automotive qualification and higher ESD immunity outweigh tighter offset and extended temp range. |
| TLV2372IDR | Rail-to-rail input/output, 2.2 V to 5.5 V supply, 3 mV max offset, 1 MHz GBW, 1.2 µA supply current per channel. | Better suited for battery-powered IoT nodes; incompatible with >5.5 V supplies and high-temp environments. | Choose for ultra-low-power, low-voltage designs where rail-to-rail I/O and sub-2 µA quiescent current are mandatory. |
Compared with LM2904DT, LM158QT offers superior temperature range and lower typical offset but lacks automotive qualification; versus TLV2372IDR, it supports higher supply voltages and extreme temperatures but consumes more current and lacks rail-to-rail input.
Availability
LM158QT is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive subsystems, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM158QT 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, delivering silicon solutions for smart mobility, power management, and industrial automation.
The LM158QT belongs to ST's legacy precision analog portfolio, engineered specifically for robust, cost-effective dual op amp functionality in harsh-environment applications demanding wide temperature tolerance and single-supply simplicity.
FAQ
Is LM158QT pin-compatible with LM358DT?
No. LM158QT uses an 8-pin DFN2×2 package with bottom-exposed thermal pad, while LM358DT uses an 8-pin SO8 package with gull-wing leads. Pin numbering differs: DFN8 assigns VCC− to Pin 4 and thermal pad to Pin 5; SO8 places VCC− at Pin 4 but has no thermal pad. Layout redesign and requalification are required for substitution.
What is the maximum capacitive load LM158QT can drive stably?
LM158QT maintains phase margin >30° up to 290 pF capacitive load at VCC = 15 V and T = 25 °C, per Figure 18 in the datasheet. For loads >100 pF, a series resistor (≥100 Ω) between output and capacitor is recommended to prevent peaking or oscillation in unity-gain configurations.
Does LM158QT support dual-supply operation?
Yes. Though optimized for single-supply use, LM158QT operates with split supplies (e.g., ±15 V) within absolute maximum ratings (±16 V). Input common-mode range extends to VCC−, and output swing remains 1.5 V shy of either rail - preserving functionality in traditional op amp topologies like inverting summers and active filters.
How does the exposed thermal pad affect PCB layout?
The exposed pad (Pin 5) must be connected to a dedicated internal or external ground plane using ≥4 thermal vias (0.3 mm diameter, spaced ≤1 mm apart) beneath the pad. Solder mask opening should match pad dimensions exactly; insufficient solder coverage causes junction temperature rise >15 °C at 100 mW dissipation, risking parametric shift or early failure.
LM158QT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Differential
- Slew Rate:
- 0.6V/µs
- Gain Bandwidth Product:
- 1.1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 nA
- Voltage - Input Offset:
- 5 mV
- Current - Supply:
- 700µA (x2 Channels)
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LM158QT FAQ
1.How can I place an order for LM158QT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM158QT 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 LM158QT reliable?
The price and inventory of LM158QT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM158QT is usually 5 days.
3.What payment methods are accepted for LM158QT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM158QT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM158QT?
LM158QT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM158QT 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 LM158QT?
For technical support, including LM158QT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM158QT requirements.
6.How does Aetrix verify that LM158QT is sourced from the original manufacturer or authorized distributors?
All LM158QT 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 LM158QT meets industry standards.
7.What is the process for return or replacement of LM158QT?
All LM158QT units undergo pre-shipment inspection (PSI). If there is an issue with LM158QT, 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 LM158QT part is unused and in its original packaging.
Return procedure for LM158QT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM158QT Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
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