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LT1785CN8#PBF

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Analog Devices RS-485/RS-422 ICs, DIP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentinterface icslt1785cn8#pbffactory-2.0.0extractor-text

Verified LT1785CN8#PBF

by Ray · last 2 Nov 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

2 Nov 2026RayPublished by the parts factory: tier mfr, 8 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: LT1785CN8#PBF · DIP-8 · 8 pins
  • ✓copper: 8 copper pads, none touching another net
  • ✓datasheet: all 8 pin names found in the 18-page datasheet
  • ✓distributor: lcsc C107757, digikey 505-LT1785CN8#PBF-ND, mouser 584-LT1785CN8#PBF
  • ✓family: DIP-8_W7.62mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-1clp8myf/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • •package_fit (skip): no component.package_dims on the page: the model is unchecked against the datasheet drawing
  • ✓pads: 8 pins = 8 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 8 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ lt1785cn8-pbf.kicad_sym✓ lt1785cn8-pbf.kicad_mod✓ lt1785cn8-pbf.step
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Ray Publish 0.1.0 5d39f22 7d ago

LT1785CN8#PBF

Analog Devices · RS-485/RS-422 ICs · DIP-8

LT1785CN8#PBF from Analog Devices, in a DIP-8. 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 RO output TTL level receiver output that is high when A ≥ B by 200mV and low when A ≤ B by 200mV, and is protected from output shorts from ground to 6V.
2 RE input TTL level receiver output enable where a logic low enables RO and a logic high places RO in high impedance, with shutdown entered only after a 3µs delay once RE and DE are both disabled.
3 DE input TTL level driver output enable where a logic high enables the driver outputs A and B and a logic low places them in high impedance.
4 DI input TTL level driver input where a logic high drives output A high and output B low, with complementary output states for DI low.
5 GND power_in Ground reference for the device.
6 A bidirectional Receiver input and driver output that is protected against voltage faults between ±60V and forces a high receiver output when V(A) ≥ V(B) + 200mV.
7 B bidirectional Receiver input and driver output that is protected against voltage faults between ±60V and forces a high receiver output when V(A) ≥ V(B) + 200mV.
8 VCC power_in Positive supply input where 4.75V ≤ VCC ≤ 5.25V for RS422 or RS485 operation, to be decoupled with a 0.1µF low ESR capacitor directly at pin 8.

Key specifications

Parameter Value
Manufacturer Analog Devices
Package DIP-8
Category Interface ICs
Pins 8

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Differential Driver Output Voltage (Unloaded) VOD1 4.1 5 V IO = 0 4
Differential Driver Output Voltage (With Load) R=50 ohm (RS422) VOD2 2 2.7 V R = 50Ω (RS422), Figure 1 4
Differential Driver Output Voltage (With Load) R=27 ohm (RS485) VOD2 1.5 2.45 V R = 27Ω (RS485), Figure 1 4
Differential Driver Output Voltage (With Load) R=18 ohm VOD2 1.2 2.2 V R = 18Ω 4
Change in Magnitude of Driver Differential Output Voltage for Complementary Output States VOD 0.2 V R = 27Ω or R = 50Ω, Figure 1 4
Driver Common Mode Output Voltage VOC 2 2.5 3 V R = 27Ω or R = 50Ω, Figure 1 4
Change in Magnitude of Driver Common Mode Output Voltage for Complementary Output States /VOC/ 0.2 V R = 27Ω or R = 50Ω, Figure 1 4
Input High Voltage VIH 2 V DI, DE, RE 4
Input Low Voltage VIL 0.8 V DI, DE, RE 4
Input Current IIN1 5 µA DI, DE, RE 4
Differential Input Threshold Voltage for Receiver VTH -0.2 0.2 V LT1785/LT1791: -7V ≤ VCM ≤ 12V 4
Receiver Output High Voltage VOH 3.5 4 V IO = -400µA, VID = 200mV 4
Receiver Output Low Voltage VOL 0.3 0.5 V IO = 1.6mA, VID = -200mV 4
Three-State (High Impedance) Output Current at Receiver -1 1 µA 0V < VOUT < 6V; RE > 2V or Power Off 4
Receiver Input Resistance (LT1785) RIN 50 90 kΩ LT1785 -7V ≤ VCM ≤ 12V 4
Driver Short-Circuit Current (VOUT = HIGH) ISC 35 250 mA VOUT = HIGH, Force VO = -7V 4
Driver Short-Circuit Current (VOUT = LOW) ISC 35 250 mA VOUT = LOW, Force VO = 12V 4
Driver Output Fault Current (VO = 60V) 6 mA VO = 60V 4
Driver Output Fault Current (VO = -60V) -6 mA VO = -60V 4
Receiver Short-Circuit Current -35 35 mA 0V ≤ VO ≤ VCC 4
Driver Three-State Output Current (-7V to 12V) -0.2 0.3 mA -7V ≤ VO ≤ 12V 4
Driver Three-State Output Current (-60V to 60V) -6 6 mA -60V ≤ VO ≤ 60V 4
Supply Current (RE=0V, DE=5V) ICC 5.5 9 mA No Load, RE = 0V, DE = 5V 4
Supply Current (RE=5V, DE=5V) ICC 5.5 9 mA No Load, RE = 5V, DE = 5V 4
Supply Current (RE=0V, DE=0V) ICC 4.5 8 mA No Load, RE = 0V, DE = 0V 4
Supply Current (RE=5V, DE=0V) ICC 0.2 0.3 mA No Load, RE = 5V, DE = 0V 4
Driver Input to Output (tPLH) tPLH 700 2000 ns Figures 3, 5 5
Driver Input to Output (tPHL) tPHL 700 2000 ns Figures 3, 5 5
Driver Output to Output Skew tSKEW 100 ns Figures 3, 5 5
Driver Rise or Fall Time tr, tf 200 800 2000 ns Figures 3, 5 5
Driver Enable to Output High tZH 500 3000 ns Figures 4, 6 5
Driver Enable to Output Low tZL 800 3000 ns Figures 4, 6 5
Driver Disable Time from Low tLZ 200 5000 ns Figures 4, 6 5
Driver Disable Time from High tHZ 800 5000 ns Figures 4, 6 5
Receiver Input to Output (tPLH) tPLH 400 900 ns Figures 3, 7 5
Receiver Input to Output (tPHL) tPHL 400 900 ns Figures 3, 7 5
Differential Receiver Skew tSKD 200 ns 5
Receiver Enable to Output Low tZL 300 1000 ns Figures 2, 8 5
Receiver Enable to Output High tZH 300 1000 ns Figures 2, 8 5
Receiver Disable from Low tLZ 400 1000 ns Figures 2, 8 5
Receiver Disable from High tHZ 400 1000 ns Figures 2, 8 5
Driver Enable from Shutdown to Output High tZH(SHDN) 12 µs Figures 2, 6; RE = 5V 5
Driver Enable from Shutdown to Output Low tZL(SHDN) 12 µs Figures 2, 6; RE = 5V 5
Receiver Enable from Shutdown to Output High tZH(SHDN) 4 µs Figures 2, 8; DE = 0V 5
Receiver Enable from Shutdown to Output Low tZL(SHDN) 4 µs Figures 2, 8; DE = 0V 5
Supply Voltage VCC 18 V 2
Receiver Enable Input Voltage -0.3 6 V 2
Driver Enable Input Voltage -0.3 6 V 2
Driver Input Voltage -0.3 18 V 2
Receiver Input Voltage -60 60 V 2
Driver Output Voltage -60 60 V 2
Storage Temperature Range -65 150 °C 2
Lead Temperature (Soldering, 10 sec) 300 °C 10 sec 2
Operating Temperature Range (LT1785C) 0 70 °C LT1785C 2
Positive Supply Input Voltage (RS422/RS485 operation) VCC 4.75 5 5.25 V For RS422 or RS485 operation 7
Thermal Resistance Junction-to-Ambient (N8 PDIP) θJA 130 °C/W TJMAX = 150°C, N8 package 2

CAD (KiCad official)

  • Symbol: LT1785CN8#PBF
  • Footprint: Package_DIP:DIP-8_W7.62mm
  • 3D model: DIP-8 (KiCad packages3D, STEP)
  • 3D model files: lt1785cn8-pbf-etched.step / lt1785cn8-pbf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lt1785cn8-pbf.step / lt1785cn8-pbf.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Analog Devices datasheet (18 pp, sha256 50c2d3317a147414, retrieved 2026-11-02, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF