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

STMicroelectronics LF247D

Name: LF247D
Brand: STMicroelectronics
SKU: LF247D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LF247D

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: LF247D.pdf

Description:: IC OPAMP JFET 4 CIRCUIT 14SO

Quantity:: RFQ Add To RFQ list

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Inventory:4,606

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Product details

Overview

LF247D from STMicroelectronics is a quad JFET-input operational amplifier with high slew rate (16 V/µs typ), low input bias current (20 pA typ), and wide common-mode input range (±11 V to +15 V). It operates from −40°C to +105°C in SO-14 package and is used in precision analog signal conditioning, audio distribution amplifiers, and bandpass filter stages.

For engineers reviewing the LF247D datasheet, LF247D pinout, LF247D application, or LF247D equivalent, key selection criteria include input offset voltage drift (10 µV/°C), output short-circuit protection, latch-up free operation, and 4 MHz gain-bandwidth product under 2 kΩ load.

Technical Context

The LF247D integrates four matched JFET-input op-amps on a single monolithic die, combining high-voltage JFETs for ultra-low input bias current with bipolar transistors for robust output drive. Its internal frequency compensation ensures unity-gain stability without external components.

Each amplifier features rail-to-rail common-mode input capability up to VCC+, differential input voltage tolerance of ±30 V, and output short-circuit protection rated for indefinite duration at ±15 V supply. Phase margin is specified at 45°, supporting stable operation in feedback configurations up to 4 MHz.

Key Specifications

Parameter	Value and Actual Design Meaning
Slew Rate	16 V/µs typical - enables clean 100 kHz sine wave amplification with ≤1% distortion at 12 Vpp output
Input Bias Current	20 pA typical at 25°C - supports high-impedance sensor interfaces without significant DC error
Input Offset Voltage	3 mV max at 25°C - ensures ≤30 mV total offset across full temperature range with 10 µV/°C drift
Gain-Bandwidth Product	4 MHz typical - allows stable closed-loop gain of 100 up to 40 kHz
Common-Mode Input Range	−12 V to +15 V at ±15 V supply - accommodates inputs beyond negative rail and up to positive rail
Output Short-Circuit Duration	Infinite - permits continuous fault-tolerant operation during transient overloads
Supply Current per Amp	1.4 mA typical - enables low-power quad-amplifier operation in battery-backed systems

Pinout & Package

LF247D is housed in a 14-pin plastic SO (Small Outline) package, 8.55–8.75 mm wide, 5.8–6.2 mm deep, with 1.27 mm lead pitch. Pin 1 is marked by a beveled corner or dot.

Pin/Terminal	Circuit Role	Design Meaning
1	Inverting Input (Amp 1)	High-impedance JFET node accepting differential signal relative to Pin 2
2	Non-inverting Input (Amp 1)	High-impedance JFET node referenced to ground or common-mode bias
3	Output (Amp 1)	Class-AB output stage capable of ±12 V swing into 2 kΩ load
4	V_CC−	Negative supply rail connection; must be decoupled locally to minimize noise coupling
5	Inverting Input (Amp 2)	Independent high-Z input for second amplifier channel
6	Non-inverting Input (Amp 2)	Second independent high-Z input with matched offset characteristics
7	Output (Amp 2)	Second buffered output with same drive strength and thermal tracking as Amp 1
8	Output (Amp 3)	Third output channel sharing same die thermal environment for matched performance
9	Non-inverting Input (Amp 3)	Third high-Z input with <10 µV/°C offset drift correlation to other channels
10	Inverting Input (Amp 3)	Third differential input with identical JFET input structure and leakage behavior
11	V_CC+	Positive supply rail; requires local 100 nF ceramic decoupling adjacent to Pin 11
12	Inverting Input (Amp 4)	Fourth independent JFET input with guaranteed matching within 1 mV offset vs. Amp 1
13	Non-inverting Input (Amp 4)	Fourth matched input enabling quad-channel synchronous signal processing
14	Output (Amp 4)	Final output with same slew rate, THD (0.01%), and phase margin (45°) as others

Key Features

Feature	Design Value
JFET input stage	Enables 10¹² Ω input resistance and sub-100 pA bias current for photodiode and piezo sensor interfacing
Internal frequency compensation	Guarantees stability at unity gain without external compensation capacitors
Output short-circuit protection	Allows indefinite shorting to either rail or ground without device degradation or thermal runaway
Latch-up free operation	Prevents destructive CMOS-like latch-up under overvoltage or ESD stress conditions
Wide common-mode range (up to V_CC+)	Supports single-supply operation with input signals extending to positive rail, simplifying level-shifting circuits

Applications

Audio Distribution Amplifier

Bandpass Filter Stage

Use Scenario: Distributing line-level audio signals to multiple destinations while preserving signal integrity and channel separation.

IC Role / Device Role / Timing Role: Quad op-amp configured as unity-gain buffers, one per output channel, leveraging 120 dB channel separation.

Use Value: Prevents crosstalk-induced intermodulation distortion and maintains flat 100 kHz bandwidth across all four outputs.

Use Scenario: Implementing second-order active bandpass filters for tone detection or RF intermediate frequency conditioning.

IC Role / Device Role / Timing Role: Four independent amplifiers used in cascaded positive-feedback topology to achieve Q = 69 and center frequency of 100 kHz.

Use Value: Achieves sharp selectivity and 16× voltage gain without external compensation, enabled by 4 MHz GBP and 16 V/µs slew rate.

Precision Sensor Signal Conditioning

Industrial Process Monitoring Interface

Use Scenario: Amplifying low-level outputs from strain gauges, thermopiles, or pH electrodes in laboratory instrumentation.

IC Role / Device Role / Timing Role: Instrumentation-grade front-end with matched quad topology minimizing inter-channel offset mismatch.

Use Value: Delivers <3 mV initial offset and <10 µV/°C drift, reducing calibration frequency in portable analyzers.

Use Scenario: Isolating and scaling 4–20 mA loop signals in PLC analog input modules operating across industrial temperature range.

IC Role / Device Role / Timing Role: Quad amplifier performing I/V conversion, filtering, level shifting, and output buffering in single IC.

Use Value: Enables −40°C to +105°C operation with <2.7 mA total quiescent current, meeting DIN EN 61000-6-2 immunity requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad JFET-input operational amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL074CDR	Lower slew rate (13 V/µs), higher input bias current (30 pA typ), same SO-14 package	Marginally lower bandwidth in fast pulse applications; acceptable for audio and general-purpose filtering	Select when cost sensitivity outweighs need for 16 V/µs slew rate or sub-20 pA bias current
LF347DT	Same architecture but commercial temperature range (0°C to +70°C); identical electrical specs except wider offset voltage (13 mV max)	Not qualified for extended industrial environments; unsuitable for outdoor or engine bay deployments	Choose only for consumer-grade products where ambient temperature remains below 70°C

Compared with TL074CDR and LF347DT, LF247D provides superior thermal stability (−40°C to +105°C), tighter input offset control (3 mV max), and higher slew rate-critical for multi-channel synchronized signal paths in industrial control and test equipment.

Availability

LF247D is available at Aetrix Electronics and suitable for precision analog signal conditioning, audio distribution amplifiers, bandpass filter stages, and industrial process monitoring interfaces requiring stable component supply across extended temperature ranges.

Supply support for LF247D 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 sensor solutions for industrial, automotive, and consumer markets.

The LF247 belongs to ST's legacy precision analog op-amp family, engineered for high-reliability industrial instrumentation and signal chain applications demanding wide temperature operation and JFET-input performance.

FAQ

What is the maximum supply voltage for LF247D?

The absolute maximum supply voltage is ±18 V (36 V total), but recommended operating range is ±15 V. Exceeding ±18 V risks permanent damage to internal junctions. Operation at ±15 V ensures full specification compliance for slew rate, output swing, and input common-mode range as documented in the March 2001 datasheet.

Does LF247D require external compensation capacitors?

No. LF247D features internal frequency compensation optimized for unity-gain stability. Adding external capacitors may degrade phase margin or cause oscillation. The 45° phase margin and 4 MHz gain-bandwidth product are validated with no external components in standard configurations like voltage followers or inverting amplifiers.

Can LF247D operate from a single +30 V supply?

Yes, but with constraints: the input common-mode range extends only to V_CC− +15 V, so with single +30 V and ground, V_CC− = 0 V and V_CC+ = +30 V, limiting valid input range to 0 V to +15 V. Output swing remains ±12 V relative to mid-rail; a virtual ground at +15 V is required for bipolar signal handling.

How does LF247D compare to LF347 in PCB layout?

LF247D and LF347 share identical SO-14 footprint and pinout, allowing direct PCB replacement if temperature and offset requirements permit. However, LF247D's −40°C to +105°C rating demands stricter thermal relief design on V_CC+/V_CC− pads and higher-grade solder paste to prevent delamination during reflow cycling in industrial environments.

LF247D Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Amplifier Type:: J-FET

Number of Circuits:: 4

Output Type:: -

Slew Rate:: 16V/µs

Gain Bandwidth Product:: 4 MHz

-3db Bandwidth:: -

Current - Input Bias:: 20 pA

Voltage - Input Offset:: 3 mV

Current - Supply:: 1.4mA (x4 Channels)

Current - Output / Channel:: 40 mA

Voltage - Supply Span (Min):: 44 V

Voltage - Supply Span (Max):: 44 V

Operating Temperature:: -40°C ~ 105°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SO

LF247D FAQ

1.How can I place an order for LF247D through Aetrix?

Please submit a Request for Quotation (RFQ) for LF247D 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 LF247D reliable?

The price and inventory of LF247D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF247D is usually 5 days.

3.What payment methods are accepted for LF247D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF247D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LF247D?

LF247D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LF247D 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 LF247D?

For technical support, including LF247D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF247D requirements.

6.How does Aetrix verify that LF247D is sourced from the original manufacturer or authorized distributors?

All LF247D 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 LF247D meets industry standards.

7.What is the process for return or replacement of LF247D?

All LF247D units undergo pre-shipment inspection (PSI). If there is an issue with LF247D, 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 LF247D part is unused and in its original packaging.

Return procedure for LF247D:

1.Submit a request within 90 days.

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

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