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SP3491EN-L
Public Made by Adomby adom
MaxLinear RS-485/RS-422 ICs, SOIC-14. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownSP3491EN-L
MaxLinear · RS-485/RS-422 ICs · SOIC-14
SP3491EN-L from MaxLinear, in a SOIC-14. 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 | NC | unconnected | No connect; not internally bonded, can be connected to Vcc without harm. |
| 2 | R | output | Receiver output, tri-stated when REB is HIGH. |
| 3 | REB | input | Receiver output enable, active LOW; a logic HIGH tri-states the receiver. |
| 4 | DE | input | Driver output enable, active HIGH; a logic LOW tri-states the driver outputs. |
| 5 | D | input | Driver input. |
| 6 | GND | power_in | Ground connection. |
| 7 | GND | power_in | Ground connection. |
| 8 | NC | unconnected | No connect; not internally bonded, can be connected to Vcc without harm. |
| 9 | Y | output | Non-inverting driver output. |
| 10 | Z | output | Inverting driver output. |
| 11 | B | input | Inverting receiver input. |
| 12 | A | input | Non-inverting receiver input. |
| 13 | NC | unconnected | No connect; not internally bonded, can be connected to Vcc without harm. |
| 14 | VCC | power_in | Positive supply, 3.00V < Vcc < 3.60V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | MaxLinear |
| Package | SOIC-14 |
| Category | Interface ICs |
| Pins | 14 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage | VCC | 3 | 3.6 | V | 5 | ||
| Supply current | ICC | 1000 | 2000 | µA | REB, D = 0V or VCC; DE = VCC | 5 | |
| Supply current | ICC | 800 | 1500 | µA | DE = 0V | 5 | |
| Differential output voltage (RS-422 load) | 2 | V | With load; R = 50Ω (RS-422); Figure 1 | 4 | |||
| Differential output voltage (RS-485 load) | 1.5 | V | With load; R = 27Ω (RS-485); Figure 1 | 4 | |||
| Change in magnitude of driver differential output voltage | 0.2 | V | R = 27Ω or R = 50Ω; Figure 1 | 4 | |||
| Driver common-mode output voltage | 3 | V | R = 27Ω or R = 50Ω; Figure 1 | 4 | |||
| Input high voltage | 2 | V | Applies to DE, D, REB | 4 | |||
| Input low voltage | 0.8 | V | Applies to DE, D, REB | 4 | |||
| Input current | -10 | 10 | µA | Applies to DE, D, REB | 4 | ||
| Driver short circuit current VOUT = HIGH | -250 | 250 | mA | -7V ≤ VO ≤ 12V; Figure 8 | 4 | ||
| Driver short circuit current VOUT = LOW | -250 | 250 | mA | -7V ≤ VO ≤ 12V; Figure 8 | 4 | ||
| Driver maximum data rate | 10 | Mbps | 4 | ||||
| Driver input to output tPLH | tPLH | 20 | 40 | 60 | ns | Figures 2 & 9 | 4 |
| Driver input to output tPHL | tPHL | 20 | 40 | 60 | ns | Figures 2 & 9 | 4 |
| Differential driver skew | 2 | ns | /tPHL(Y)- tPLH(Y)/, /tPHL(Z)- tPLH(Z)/, Figures 2 and 9 | 4 | |||
| Driver rise or fall time | 5 | 20 | ns | From 10%-90%; Figures 3 and 10 | 4 | ||
| Driver enable to output HIGH | tPZH | 52 | 120 | ns | Figures 4 and 11 | 4 | |
| Driver enable to output LOW | tPZL | 60 | 120 | ns | Figures 5 and 11 | 4 | |
| Driver disable from LOW | tPLZ | 40 | 120 | ns | Figures 5 and 11 | 4 | |
| Driver disable from HIGH | tPHZ | 60 | 120 | ns | Figures 4 and 11 | 4 | |
| Receiver differential input threshold | -0.2 | 0.2 | Volts | -7V ≤ VCM ≤ 12V | 5 | ||
| Receiver input hysteresis | 25 | mV | VCM = 0V | 5 | |||
| Receiver output voltage LOW | VOL | 0.4 | Volts | VID = -200mV, IO = 2.5mA | 5 | ||
| Three-state (high impedance) output current | -1 | 1 | µA | 0V ≤ VO ≤ Vcc; REB = Vcc | 5 | ||
| Receiver input resistance | 12 | 15 | kΩ | -7V ≤ VCM ≤ 12V | 5 | ||
| Input current (A, B); VIN = 12V | 1 | mA | DE = 0V, VCC = 0V or 3.6V, VIN = 12V | 5 | |||
| Input current (A, B); VIN = -7V | -0.8 | mA | DE = 0V, VCC = 0V or 3.6V, VIN = -7V | 5 | |||
| Receiver short circuit current | 60 | mA | 0V ≤ VO ≤ VCC | 5 | |||
| Receiver maximum data rate | 10 | Mbps | REB = 0V, DE = 0V | 5 | |||
| Receiver input to output tPLH | tPLH | 40 | 70 | 120 | ns | Figures 6 and 12 | 5 |
| Receiver input to output tPLH | tPLH | 85 | ns | TAMB = 25°C, Vcc = 3.3V, Figures 6 and 12 | 5 | ||
| Receiver input to output tPHL | tPHL | 40 | 70 | 120 | ns | Figures 6 and 12 | 5 |
| Receiver input to output tPHL | tPHL | 85 | ns | TAMB = 25°C, Vcc = 3.3V, Figures 6 and 12 | 5 | ||
| Differential receiver skew | 4 | ns | /tPHL(A)- tPLH(A)/, /tPHL(B)- tPLH(B)/, Figures 6 and 12 | 5 | |||
| Receiver enable to output LOW | 65 | 150 | ns | Figures 7 and 13; S1 Closed, S2 open | 5 | ||
| Receiver enable to output HIGH | 65 | 150 | ns | Figures 7 and 13; S2 Closed, S1 open | 5 | ||
| Receiver disable from LOW | 65 | 200 | ns | Figures 7 and 13; S1 Closed, S2 open | 5 | ||
| Receiver disable from HIGH | 65 | 200 | ns | Figures 7 and 13; S2 Closed, S1 open | 5 | ||
| ESD protection (HBM) | -2 | 2 | kV | Human Body Model, R, D, DE, REB, A, B, Y and Z pins | 5 | ||
| Supply voltage | VCC | 6 | V | 2 | |||
| Logic input voltage | -0.3 | 6 | V | Input Voltages, Logic | 2 | ||
| Driver input voltage | -0.3 | 6 | V | Input Voltages, Drivers | 2 | ||
| Receiver input voltage | -14 | 14 | V | Input Voltages, Receivers | 2 | ||
| Driver output voltage | -14 | 14 | V | Output Voltages, Drivers | 2 | ||
| Receiver output voltage | -0.3 | 6 | V | Output Voltages, Receivers | 2 | ||
| Storage temperature | -65 | 150 | ˚C | 2 | |||
| Operating temperature range | -40 | 85 | °C | SP3491EN-L | 12 | ||
| Thermal resistance junction-to-ambient, 14-pin NSOIC | ΘJA | 88.2 | ˚C/W | 14-pin NSOIC | 2 |
CAD (KiCad official)
- Symbol:
SP3491EN-L - Footprint:
Package_SO:SOIC-14_3.9x8.7mm_P1.27mm - 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files:
sp3491en-l-etched.step/sp3491en-l-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sp3491en-l.step/sp3491en-l.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: MaxLinear datasheet (12 pp, sha256
53de7ea6a2a264b2, retrieved 2026-10-22, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-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).