MC34184M - Low-Power Quad JFET Op Amp | onsemi
MPN: MC34184M ✗ जीवन की समाप्तिMC34184M अवलोकन
A JFET-input operational amplifier is a voltage-amplifier device whose input stage uses junction field-effect transistors. This input architecture provides high input resistance and low input bias current while supporting relatively low supply-current operation. Within the power-management and analog-signal hierarchy, the MC34184M belongs to the operational-amplifier family and functions as a high-impedance buffer or closed-loop gain stage between sensors, transducers, analog switches, and downstream conversion or control circuitry.
The primary performance characteristics of the MC34184M include a 4.0 MHz gain-bandwidth product, 10 V/us slew rate, and approximately 210 uA of supply current per amplifier. Its JFET input stage provides high input resistance, low input offset voltage, and high open-loop gain according to the Motorola MC34184 datasheet. These characteristics make the amplifier appropriate for precision current-voltage conversion, low-level signal amplification, active filtering, and feedback networks operating at low or moderate frequencies.
The family architecture also supports practical instrumentation requirements because low input bias current reduces disturbance of high-impedance sources. A high gain-bandwidth product allows useful closed-loop bandwidth above the audio range when configured with conventional compensation and suitable external resistors. The 10 V/us slew rate improves handling of moderately fast signal edges, although the 4.0 MHz bandwidth places the device in the general-purpose precision-amplifier class rather than the high-speed operational-amplifier class.
Typical applications include bridge-sensor signal conditioning, biomedical instrumentation, photodiode and phototransistor amplifiers, audio preamplification, active filters, sample-and-hold stages, and low-frequency closed-loop control loops. In each case, the amplifier should be evaluated for input common-mode range, output swing, noise, offset, stability, and supply compatibility under the actual operating conditions.
Designers should verify the package dimensions, pin numbering, electrical limits, and common-mode range against the manufacturer documentation before layout. Input and feedback resistors must also be selected for low thermal noise and acceptable bias-current error. Bias compensation may be useful when source resistance is high enough that input bias current produces a material offset across the source impedance.
This page organizes the core MC34184M electrical characteristics, practical application guidance, comparison parameters, and design considerations into one engineering-focused reference. It supports early architecture selection while preserving the need to verify production details, lifecycle commitments, and assembly-specific information with the manufacturer before releasing a design.
के लिए ड्रॉप-इन विकल्प MC34184M — समान पैकेज, पिन-टू-पिन संगत। PCB रीवर्क आवश्यक करने वाले भिन्न-पैकेज पार्ट्स शामिल नहीं हैं।
इस उत्पाद के लिए कोई drop-in alternatives उपलब्ध नहीं।
विकल्प अनुरोध करेंMC34184M Maximum Ratings और Electrical Characteristics
| Amplifier Type | Quad JFET-input operational amplifier |
| Supply Current per Amplifier | 210 uA |
| Gain-Bandwidth Product | 4.0 MHz |
| Slew Rate | 10 V/us |
| Input Stage Architecture | JFET input |
MC34184M standard पिन कॉन्फ़िगरेशन गाइड
MC34184M (standard पैकेज) के लिए पिन कॉन्फ़िगरेशन। इस एनालॉग कंपोनेंट में इनपुट, आउटपुट और पावर सप्लाई पिन हैं। ऑफ़सेट नल, कम्पनसेशन और एनेबल पिन कॉन्फ़िगरेशन के लिए निर्माता डेटाशीट देखें। सिग्नल कंडीशनिंग और एम्प्लीफ़ायर सर्किट के लिए आदर्श।
इसके लिए कोई विस्तृत pinout data उपलब्ध नहीं: MC34184M.
देखें डेटाशीट पूर्ण पिन कॉन्फ़िगरेशन के लिए।
सामान्य अनुप्रयोग
MC34184M के लिए उपयुक्त है 6 अनुप्रयोगs: High-Impedance Sensor Signal Conditioning, Precision Bridge Measurement, Active Audio Filter, Photodiode and Optical Sensor Interface, Low-Frequency Control Loop, Sample-and-Hold Signal Path.
High-Impedance Sensor Signal Conditioning
The MC34184M fits low-level sensor amplification because its JFET input stage provides high input resistance and low input bias current, while the 4.0 MHz gain-bandwidth product supports moderate closed-loop bandwidth. Use one channel as a transimpedance or voltage amplifier ahead of an ADC or data converter. Source resistance, input capacitance, bias-current offset, common-mode range, and output swing must be checked together because a high-impedance sensor can make leakage and stray capacitance more important than raw bandwidth.
Precision Bridge Measurement
A Wheatstone bridge can use two MC34184M channels to amplify the differential bridge error and two additional channels for reference or auxiliary functions. The JFET inputs reduce loading of the bridge, and the 210 uA per-amplifier supply current supports low-power measurement systems. Practical designs should evaluate bridge excitation voltage, common-mode limits, input offset, resistor matching, and the amplifier's ability to preserve low-level signals without saturating during bridge startup or fault conditions.
Active Audio Filter
The MC34184M is appropriate for active audio filtering when a four-channel package simplifies preamplifier and equalizer layouts. Its 4.0 MHz gain-bandwidth product exceeds typical audio-band requirements, and the 10 V/us slew rate supports moderate waveform slopes. Select resistor and capacitor values using the manufacturer's recommended noise-gain relationships, then verify closed-loop stability across the intended frequency range. Output loading, headroom, distortion, and the interaction between adjacent filter channels also influence the final design.
Photodiode and Optical Sensor Interface
For photodiode and optical-sensor interfaces, the MC34184M's low-bias-current JFET input stage helps preserve weak current signals, while its moderate 4.0 MHz bandwidth is useful for low-to-medium-frequency transimpedance loops. The required feedback resistor and compensation capacitor depend on sensor capacitance, and the complete loop must be checked for stability. Input protection, dark-current behavior, temperature drift, and output saturation during high-light conditions are equally important to signal-chain performance.
Low-Frequency Control Loop
The MC34184M can amplify error signals and drive feedback networks in low-frequency control or monitoring loops. Its high open-loop gain supports precise closed-loop behavior, while the 4.0 MHz gain-bandwidth product offers more bandwidth than many slow sensor-control systems require. Verify output current and swing against the actuator or feedback network, include suitable compensation for the plant, and keep sensitive error traces away from switching regulators and digital return currents.
Sample-and-Hold Signal Path
The four channels in the MC34184M can support buffering, gain adjustment, and isolation stages around sample-and-hold systems. The JFET input stage is advantageous when the source presents high impedance, and the 10 V/us slew rate helps preserve moderate transitions after acquisition. Real implementations must account for capacitor leakage, switch charge injection, hold droop, amplifier bias-current error, and settling behavior. The amplifier should also remain within its input and output common-mode limits during every acquisition and hold interval.
के लिए इंजीनियरिंग संदर्भ डेटा MC34184M — तुलना, डिज़ाइन मार्गदर्शन और अनुपालन जानकारी।
चयन गाइड
विकल्पों के साथ तुलना
| पैरामीटर | यह उत्पाद |
|---|---|
| Brand | onsemi |
| Amplifier Count | 4 amplifiers |
| Input Stage | JFET input |
| Supply Current per Amplifier | 210 uA |
| Gain-Bandwidth Product | 4.0 MHz |
| Slew Rate | 10 V/us |
मुख्य विशेषताएँ
- Four amplifiers share one package (बनामMC34182)
- Low-power JFET input architecture (बनामMC34184D)
- Moderate bandwidth with high slew rate (बनामMC34182)
डिज़ाइन नोट्स
Keep the four amplifier input nodes short and isolated from switching nodes. High-impedance inputs can couple leakage and stray capacitance even when the amplifier itself operates below 4.0 MHz. Route sensitive inputs away from inductors, switching-regulator power paths, and exposed connector fields; use a surrounding ground or guard structure where the circuit and manufacturing process permit it.
Do not assume that low input bias current eliminates gain error in every source configuration. Calculate the offset contribution produced by input bias current across the effective source resistance, especially for resistive dividers and sensor outputs. If that error is material, consider bias-current compensation or a lower-offset alternative while also checking temperature drift and the amplifier's input common-mode range.
Verify closed-loop stability at every intended gain rather than relying only on the 4.0 MHz gain-bandwidth-product figure. Include the source capacitance, load capacitance, external resistance, and feedback-network values in the analysis. In photodiode and high-impedance sensor circuits, the feedback capacitor and board parasitics materially shape stability and usable bandwidth.
Bypass the supply pins with a short, low-inductance path and place the capacitor close to the device. The 210 uA per-amplifier rating describes amplifier bias consumption, but total system current also includes output load current, reference circuitry, and switching losses. Confirm the absolute maximum and recommended supply limits from the manufacturer documentation before selecting the system supply.
अनुपालन जानकारी
The technical source does not state the MC34184M compliance declarations, so each status remains unknown.
