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ISL32478EIBZ-T

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

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ISL32478EIBZ-T

RENESAS · RS-485 / RS-422 ICs · SOIC-8

ISL32478EIBZ-T from RENESAS, in a SOIC-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 Receiver output; RO is high if A-B is at or above the threshold stated as 10mV and low if A-B is at or below 200mV, and RO is high if A and B are floating, shorted together, or on a terminated undriven bus.
2 RE input Receiver output enable; RO is enabled when RE is low and is high impedance when RE is high, with an internal pull-down.
3 DE input Driver output enable; the driver outputs (A/Y and B/Z) are enabled when DE is high and are high impedance when DE is low, with an internal pull-up.
4 DI input Driver input; a low on DI forces output Y low and output Z high, and a high on DI forces Y high and Z low.
5 GND power_in Ground connection.
6 A/Y bidirectional ±60V fault and ±16.5kV HBM ESD protected RS-485/RS-422 level non-inverting receiver input and driver output; it is an input when DE = 0 and an output when DE = 1.
7 B/Z bidirectional ±60V fault and ±16.5kV HBM ESD protected RS-485/RS-422 level inverting receiver input and driver output; it is an input when DE = 0 and an output when DE = 1.
8 VCC power_in System power supply input, 4.5V to 5.5V.

Key specifications

Parameter Value
Manufacturer RENESAS
Package SOIC-8
Category Interface
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
Driver Differential VOUT (Loaded), RL = 100Ω (RS-422) VOD2 2.4 3.2 V RL = 100Ω (RS-422), Full temp range 5
Driver Differential VOUT (Loaded), RL = 54Ω (RS-485) VOD2 1.5 2.5 V RL = 54Ω (RS-485), Full temp range; printed max is VCC 5
Driver Differential VOUT (Loaded), RL = 54Ω (PROFIBUS) VOD2 2 2.5 V RL = 54Ω (PROFIBUS, VCC ≥ 5V), Full temp range 5
Driver Differential VOUT (Loaded), six 120Ω terminations VOD2 0.8 1.3 V RL = 21Ω, VCC ≥ 4.75V, Full temp range 5
Change in Magnitude of Driver Differential VOUT ΔVOD 0.2 V RL = 54Ω or 100Ω (Figure 5A) 5
Driver Differential VOUT with Common-Mode Load (-7V to 12V) VOD3 1.5 2.1 V RL = 60Ω, -7V ≤ VCM ≤ 12V; printed max is VCC 5
Driver Differential VOUT with Common-Mode Load (-15V to 15V) VOD3 1.7 2.3 V RL = 60Ω, -15V ≤ VCM ≤ 15V, VCC ≥ 4.75V 5
Driver Common-Mode VOUT VOC -1 3 V RL = 54Ω or 100Ω (Figure 5A) 5
Change in Magnitude of Driver Common-Mode VOUT ΔVOC 0.2 V RL = 54Ω or 100Ω (Figure 5A) 5
Driver Short-Circuit Current IOSD -250 250 mA DE = VCC, -15V ≤ VO ≤ 15V (Note 10) 5
Driver Short-Circuit Current at first foldback IOSD1 -83 83 mA At first foldback, 22V ≤ VO ≤ -22V 5
Driver Short-Circuit Current at second foldback IOSD2 -13 13 mA At second foldback, 35V ≤ VO ≤ -35V 5
Logic Input High Voltage VIH 2.5 V DE, DI, RE, Full temp range 5
Logic Input Low Voltage VIL 0.8 V DE, DI, RE, Full temp range 5
Logic Input Current DI IIN1 -1 1 µA DI, Full temp range 5
Logic Input Current DE, RE IIN1 -15 6 15 µA DE, RE, Full temp range 5
Input/Output Current (A/Y, B/Z), VIN = 12V IIN2 110 250 µA DE = 0V, VCC = 0V or 5.5V, VIN = 12V 6
Input/Output Current (A/Y, B/Z), VIN = -7V IIN2 -200 -75 µA DE = 0V, VCC = 0V or 5.5V, VIN = -7V 6
Input/Output Current (A/Y, B/Z), VIN = ±15V IIN2 -800 240 800 µA DE = 0V, VCC = 0V or 5.5V, VIN = ±15V 6
Input/Output Current (A/Y, B/Z), VIN = ±60V IIN2 -6 0.5 6 mA DE = 0V, VCC = 0V or 5.5V, VIN = ±60V (Note 18) 6
Receiver Differential Threshold Voltage VTH -200 -100 -10 mV -15V ≤ VCM ≤ 15V, Full temp range 6
Receiver Input Hysteresis ΔVTH 25 25 mV -15V ≤ VCM ≤ 15V 6
Receiver Output High Voltage, IO = -8mA VOH 2.8 4.2 V IO = -8mA, VID = -10mV, Full temp range 6
Receiver Output Low Voltage VOL 0.27 0.4 V IO = 6mA, VID = -200mV, Full temp range 6
Receiver Output Low Current IOL 15 22 mA VO = 1V, VID = -200mV, Full temp range 6
Three-State Receiver Output Current IOZR -1 0.01 1 µA 0V ≤ VO ≤ VCC, Full temp range 6
Receiver Short-Circuit Current IOSR 12 110 mA 0V ≤ VO ≤ VCC, Full temp range 6
No-Load Supply Current ICC 2.3 4.5 mA DE = VCC, RE = 0V or VCC, DI = 0V or VCC, Full temp range 6
Shutdown Supply Current ISHDN 10 50 µA DE = 0V, RE = VCC, DI = 0V or VCC, Full temp range 6
Driver Rise or Fall Time (15Mbps) tR, tF 5 17 30 ns RD = 54Ω, CD = 50pF (Figure 6) 7
Driver Differential Output Delay (15Mbps) tPLH, tPHL 21 45 ns RD = 54Ω, CD = 50pF (Figure 6) 7
Driver Differential Output Skew (15Mbps) tSKEW 3 6 ns RD = 54Ω, CD = 50pF (Figure 6) 7
Maximum Data Rate (Driver, 15Mbps) fMAX 15 25 Mbps CD = 470pF (Figure 8) 7
Driver Enable to Output High (15Mbps) tZH 100 ns SW = GND (Figure 7), (Note 11) 7
Driver Enable to Output Low (15Mbps) tZL 100 ns SW = VCC (Figure 7), (Note 11) 7
Driver Disable from Output Low tLZ 120 ns SW = VCC (Figure 7) 7
Driver Disable from Output High tHZ 120 ns SW = GND (Figure 7) 7
Time to Shutdown tSHDN 60 160 600 ns (Note 13) 7
Driver Enable from Shutdown to Output High tZH(SHDN) 2000 ns SW = GND (Figure 7), (Notes 13, 14) 7
Driver Enable from Shutdown to Output Low tZL(SHDN) 2000 ns SW = VCC (Figure 7), (Notes 13, 14) 7
Maximum Data Rate (Receiver, 15Mbps) fMAX 15 25 Mbps (Figure 9) 8
Receiver Input to Output Delay (15Mbps) tPLH, tPHL 35 70 ns (Figure 9) 8
Receiver Skew (15Mbps) tSKD 4 10 ns (Figure 9) 8
Receiver Enable to Output Low tZL 50 ns RL = 1kΩ, CL = 15pF, SW = VCC (Figure 10), (Note 12) 8
Receiver Enable to Output High tZH 50 ns RL = 1kΩ, CL = 15pF, SW = GND (Figure 10), (Note 12) 8
Receiver Disable from Output Low tLZ 50 ns RL = 1kΩ, CL = 15pF, SW = VCC (Figure 10) 8
Receiver Disable from Output High tHZ 50 ns RL = 1kΩ, CL = 15pF, SW = GND (Figure 10) 8
Receiver Enable from Shutdown to Output High tZH(SHDN) 2000 ns RL = 1kΩ, CL = 15pF, SW = GND (Figure 10), (Notes 13, 15) 9
Receiver Enable from Shutdown to Output Low tZL(SHDN) 2000 ns RL = 1kΩ, CL = 15pF, SW = VCC (Figure 10), (Notes 13, 15) 9
Supply Voltage VCC to Ground VCC 7 V 5
Input/Output Voltage A/Y, B/Z, A, B, Y, Z -60 60 V 5
Transient Pulse Voltage A/Y, B/Z, A, B, Y, Z -80 80 V Transient pulse through 100Ω (Note 17) 5
Input Voltage DI, DE, RE -0.3 V 5
Receiver Output Voltage RO -0.3 V 5
Supply Voltage (VCC) VCC 5 V Recommended operating conditions as printed 5
Operating Temperature Range TA -40 85 °C 5
Bus Pin Common-Mode Voltage Range VCM -15 15 V 5
Thermal Resistance Junction-to-Ambient, 8 Ld SOIC θJA 108 °C/W Typical; notes 6, 7 5
Thermal Resistance Junction-to-Case, 8 Ld SOIC θJC 47 °C/W Typical; notes 6, 7 5
Maximum Junction Temperature (Plastic Package) TJ 150 °C 5

CAD (KiCad official)

  • Symbol: ISL32478EIBZ-T
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: isl32478eibz-t-etched.step / isl32478eibz-t-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); isl32478eibz-t.step / isl32478eibz-t.glb are the bare package body.

Provenance

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

  • Datasheet: RENESAS datasheet (21 pp, sha256 d78425ae58ecdc0d, retrieved 2026-10-18, tier: lcsc)
  • 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