component
SC34018CP
Public Made by Adomby adom
Silicore(芯谷) Audio Amplifiers, SOP-28. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
Generated by kicad-footprint-generator · KiCad file format 20260206
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SC34018CP
Silicore(芯谷) · Audio Amplifiers · SOP-28
SC34018CP from Silicore(芯谷), in a SOP-28. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | RR | passive | A resistor to ground provides the reference current for the transmit and receive attenuators. |
| 2 | RTX | passive | A resistor to ground sets the nominal transmit attenuator gain, which is inversely proportional to the RTX resistance. |
| 3 | TXI | input | Input to the transmit attenuator, with nominal input resistance of 5.0kΩ. |
| 4 | TXO | output | Output of the transmit attenuator that drives the transmit level detector and the external circuit driving the telephone line. |
| 5 | TLI | input | Input of the transmit level detector, AC coupled through an external resistor that sets the detection level; decreasing the resistor increases sensitivity. |
| 6 | TLO | output | Output of the transmit level detector, where an external resistor and capacitor set how long the system stays in transmit mode after speech ceases. |
| 7 | RLI | input | Input of the receive level detector, AC coupled through an external resistor that sets the detection level; decreasing the resistor increases sensitivity. |
| 8 | RLO | output | Output of the receive level detector, where an external resistor and capacitor set how long the system stays in receive mode after the receive signal ceases. |
| 9 | MCI | input | Microphone amplifier input with nominal input impedance of 10kΩ and DC bias approximately equal to VB. |
| 10 | MCO | output | Microphone amplifier output with internally set gain of 34dB (50V/V). |
| 11 | CP1 | passive | A parallel resistor and capacitor between this pin and Vcc hold a voltage corresponding to the background noise level, which the transmit detector compares with the speech signal from CP2. |
| 12 | CP2 | passive | A capacitor at this pin peak-detects speech signals for comparison with the background noise level held at CP1. |
| 13 | XDI | input | Input to the transmit detector system, AC coupled from the microphone amplifier output through an external resistor. |
| 14 | SKG | power_in | High-current ground pin for the speaker amplifier output stage, which should be within 10mV of the ground voltage at pin 22. |
| 15 | SKO | output | Speaker amplifier output that sources and sinks up to 100uA when AC coupled to the speaker, with internally set gain of 34dB (50V/V). |
| 16 | V+ | power_in | Input DC supply voltage of 6.0 to 11V (7.5V nominal) at 7.0mA, which can be powered from Tip and Ring if an AC decoupling inductor is used. |
| 17 | AGC | passive | A capacitor from this pin to VB sets the attack and decay time of the speaker amplifier gain control loop, with internal resistance nominally 110kΩ. |
| 18 | CS | input | Digital chip select input: below 0.7V enables the Vcc regulator, above 1.6V places the chip in standby drawing 0.5mA, and the input must not exceed 11V. |
| 19 | SKI | input | Input to the speaker amplifier with nominal input impedance of 20kΩ. |
| 20 | Vcc | power_out | A 5.4V regulated output that powers all circuits except the speaker amplifier output stage, rated for 3.0mA max external load and requiring a filter capacitor. |
| 21 | VB | power_out | An output at approximately Vcc/2 serving as the analog ground, which can source up to 1.5mA external load with 250Ω output impedance and requires a filter capacitor. |
| 22 | GND | power_in | Ground pin for the IC, except the speaker amplifier. |
| 23 | XDC | output | Transmit detector output where a resistor and capacitor hold the transmit mode during pauses, with internal resistance nominally 2.6kΩ. |
| 24 | VLC | input | Volume control input for receive mode, connected to a variable resistor slider, with voltage that must be less than or equal to VB. |
| 25 | ACF | passive | Attenuator control filter where a connected capacitor reduces noise transients as the attenuation level switches. |
| 26 | RXO | output | Output of the receive attenuator, normally AC coupled to the input of the speaker amplifier. |
| 27 | RXI | input | Input of the receive attenuator with nominal input resistance of 5.0kΩ. |
| 28 | RRX | passive | A resistor to ground sets the nominal receive attenuator gain, which is directly proportional to the RRX resistance. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Silicore(芯谷) |
| Package | SOP-28 |
| Category | Amplifiers/Comparators |
| Pins | 28 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Vcc Voltage | Vcc | 4.9 | 5.4 | 5.9 | Vdc | V+=7.5V | 6 |
| Line Regulation | ΔVccLN | 65 | 150 | mV | 6.5V<V+<11V | 6 | |
| Output Resistance | Rovcc | 6 | 20 | Ω | Icc=3.0mA | 6 | |
| Dropout Voltage | Vccsat | 80 | 300 | mV | V+=5.0V | 6 | |
| VB Voltage | VB | 2.5 | 2.9 | 3.3 | Vdc | V+=7.5V | 6 |
| Receive Attenuator Gain, Rx Mode | GRX | 2 | 6 | 10 | dB | Pin24=VB; Pin27=250mVrms | 6 |
| Receive Attenuator Range, Rx to Tx Mode | ΔGRX | 40 | 44 | 48 | dB | Rx to Tx Mode | 6 |
| Receive Attenuator Gain, Idle Mode | GRXI | -20 | -16 | -12 | dB | Pin 27=250mVrms | 6 |
| RXO Voltage (Rx Mode) | VRXO | 1.8 | 2.3 | 3.2 | Vdc | 6 | |
| RXO Source Current (Rx Mode) | IRXOH | 1 | 3 | mA | 6 | ||
| RXI Input Resistance | RRXI | 3.5 | 5 | 8 | kΩ | 6 | |
| Volume Control Range (Rx Attenuator Gain, Rx Mode) | VCR | 24.5 | 32.5 | dB | 0.6VB<Pin 24<VB | 6 | |
| Transmit Attenuator Gain, Rx Mode | GTX | 4 | 6 | 8 | dB | Pin 3=250mVrms | 6 |
| Transmit Attenuator Range, Rx to Tx Mode | ΔGTX | 40 | 44 | 48 | dB | Rx to Tx Mode | 6 |
| Transmit Attenuator Gain, Idle Mode | GTXI | -16.5 | -13 | -8.5 | dB | Pin 3=250mVrms | 6 |
| TXO Voltage (Tx Mode) | VTXO | 1.8 | 2.3 | 3.2 | Vd | 6 | |
| TXO Source Current (Tx Mode) | ITXOH | 1 | 3 | mA | 6 | ||
| TXI Input Resistance | RTXI | 3.5 | 5 | 8 | kΩ | 6 | |
| Speaker Amp Gain | GSPK | 33 | 34 | 35 | dB | Pin19=20mVrms | 7 |
| SKI Input Resistance | RSKI | 15 | 22 | 37 | kΩ | Pin19=Cap Couple to GND | 7 |
| SKO Voltage | VSKO | 2.4 | 3 | 3.6 | Vd | 7 | |
| Mike Amp Gain | GMCI | 32.5 | 34 | 35 | dB | 7 | |
| Mike Amp Input Resistance | RMCI | 6.5 | 10 | 16 | kΩ | 7 | |
| Transmit-Receive Switch Threshold | ITH | 0.8 | 1.2 | μA | Ratio of ITLI to IRLI at 20μA to switch Tx-Rx comparator | 7 | |
| CP2 Current Source | ICP2 | 5 | 10 | 13 | μA | 7 | |
| V+ Terminal Voltage (Pin 16) | V+ | 6 | 11 | V | 5 | ||
| CS (Pin 18) | CS | 0 | 11 | V | 5 | ||
| Icc (Pin 20) | Icc | 0 | 3 | mA | 5 | ||
| Receive Signal (Pin 27) | 0 | 250 | mVrms | 5 | |||
| Microphones Signal (Pin 9) | 0 | 5 | mVrms | 5 | |||
| Speaker Amp Ground (Pin 14) | -10 | 10 | mVdc | 5 | |||
| Ambient Temperature | -20 | 60 | °C | 5 | |||
| V+ Terminal Voltage (Pin 16) | V+ | -1 | 12 | V | Voltages referred to Pin 22, Ta=25°C | 4 | |
| CS (Pin 18) | CS | -1 | 12 | V | Voltages referred to Pin 22, Ta=25°C | 4 | |
| Speaker Amp Ground (Pin 14) | -1 | 3 | V | Voltages referred to Pin 22, Ta=25°C | 4 | ||
| VLC (Pin 24) | VLC | -1 | V | Voltages referred to Pin 22, Ta=25°C | 4 | ||
| Storage Temperature | -65 | 150 | °C | Ta=25°C | 4 | ||
| V+ Supply Current (V+=11V, Pin 18=0.7V) | Iv+ | 9 | mA | V+=11V, Pin 18=0.7V | 6 | ||
| V+ Supply Current (V+=11V, Pin 18=1.6V) | Iv+ | 800 | μA | V+=11V, Pin 18=1.6V | 6 | ||
| Output Resistance | ROVB | 250 | Ω | IB=1.7mA | 6 | ||
| Delta RXO Voltage (Switch from Rx To Tx Mode) | ΔVRXO | 100 | mV | 6 | |||
| RXO Sink Current (Rx Mode) | IRXOL | 75 | μA | 6 | |||
| Delta TXO Voltage (Switch from Tx To Rx Mode) | ΔVTXO | 100 | mV | 6 | |||
| TXO Sink Current (Tx Mode) | ITXOL | 75 | μA | 6 | |||
| ACF Voltage Rx Mode | ΔVACF | 150 | mV | Vcc-Pin25 Voltage | 7 | ||
| ACF Voltage Rx Mode | 6 | mV | 7 | ||||
| ACF Voltage Idle Mode | 75 | mV | 7 | ||||
| SKO High Voltage | VSKOH | 5.5 | Vdc | Pin19=0.1V, -100mA Load at Pin 15 | 7 | ||
| SKO Low Voltage | VSKOL | 600 | mV | Pin19=0.1V, -100mA Load at Pin 15 | 7 | ||
| RLO Leakage Current | ILKRLO | 2 | μA | Pin 8=VB+1.0V | 7 | ||
| TLO Leakage Current | ILKTLO | 2 | μA | Pin 6=VB+1.0V | 7 | ||
| Transmit Detector XDC Voltage (Idle Mode) | VXDC | 0 | Vdc | Idle Mode | 7 | ||
| Transmit Detector XDC Voltage (Tx Mode) | VXDC | 4 | Vdc | Tx Mode | 7 | ||
| Distortion, Rx Mode (RXI to SKO) | RXD | 1.5 | % | Pin27=10mVrms 1.0kHz | 7 | ||
| Distortion, Tx Mode (MCI to TXO) | TXD | 2 | % | Pin9=5.0mVrms 1.0kHz | 7 |
CAD (KiCad official)
- Symbol:
SC34018CP - Footprint:
Package_SO:SOP-28_8.4x18.16mm_P1.27mm - 3D model: SOP-28 (KiCad packages3D, STEP)
- 3D model files:
sc34018cp-etched.step/sc34018cp-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sc34018cp.step/sc34018cp.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Silicore(芯谷) datasheet (13 pp, sha256
a75824da5ac31a40, retrieved 2026-10-17, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).