# ISL3332IAZ

**RENESAS** · Pre-ordered Chips · SSOP-28-208mil

ISL3332IAZ from RENESAS, in a SSOP-28-208mil. 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 | C1+ | passive | Voltage doubler external capacitor connection (RS-232); not needed if both ports are in RS-485 mode. |
| 2 | C1- | passive | Voltage doubler external capacitor connection (RS-232); not needed if both ports are in RS-485 mode. |
| 3 | V+ | power_out | Internally generated positive RS-232 transmitter supply (+5.5V); C3 not needed if both ports are in RS-485 mode. |
| 4 | A1 | input | Port 1 receiver input with 15kV ESD protection; RS-232 receiver input or RS-485 inverting receiver input. |
| 5 | B1 | input | Port 1 receiver input with 15kV ESD protection; RS-232 receiver input or RS-485 noninverting receiver input. |
| 6 | Y1 | output | Port 1 driver output with 15kV ESD protection; RS-232 driver output or RS-485 inverting driver output. |
| 7 | Z1 | output | Port 1 driver output with 15kV ESD protection; RS-232 driver output or RS-485 noninverting driver output. |
| 8 | SEL1 | input | Port 1 interface mode select: high selects RS-485 mode, low selects RS-232 mode. |
| 9 | SEL2 | input | Port 2 interface mode select: high selects RS-485 mode, low selects RS-232 mode. |
| 10 | Z2 | output | Port 2 driver output with 15kV ESD protection; RS-232 driver output or RS-485 noninverting driver output. |
| 11 | Y2 | output | Port 2 driver output with 15kV ESD protection; RS-232 driver output or RS-485 inverting driver output. |
| 12 | B2 | input | Port 2 receiver input with 15kV ESD protection; RS-232 receiver input or RS-485 noninverting receiver input. |
| 13 | A2 | input | Port 2 receiver input with 15kV ESD protection; RS-232 receiver input or RS-485 inverting receiver input. |
| 14 | GND | power_in | Ground connection. |
| 15 | V- | power_out | Internally generated negative RS-232 transmitter supply (-5.5V); C4 not needed if both ports are in RS-485 mode. |
| 16 | RB2 | output | Port 2 RS-232 receiver output; in RS-485 mode not used and internally pulled high. |
| 17 | RA2 | output | Port 2 receiver output; RS-232 receiver output or RS-485 receiver output (high if inputs open or shorted, full fail-safe). |
| 18 | DZ2/DE2 | input | Port 2 RS-232 driver input DZ, or RS-485 driver output enable DE (high enables Y, Z; internally pulled high in RS-485 mode). |
| 19 | DY2 | input | Port 2 driver input; low forces Y high (RS-232) and a high forces Y low. |
| 20 | ON/OFF | input | A low disables all outputs and charge pumps for low power shutdown; internally pulled high, high for normal operation. |
| 21 | LB | input | Enables loopback mode when low; internally pulled high. |
| 22 | DY1 | input | Port 1 driver input; low forces Y high (RS-232) and a high forces Y low. |
| 23 | DZ1/DE1 | input | Port 1 RS-232 driver input DZ, or RS-485 driver output enable DE (high enables Y, Z; internally pulled high in RS-485 mode). |
| 24 | RA1 | output | Port 1 receiver output; RS-232 receiver output or RS-485 receiver output (high if inputs open or shorted, full fail-safe). |
| 25 | RB1 | output | Port 1 RS-232 receiver output; in RS-485 mode not used and internally pulled high. |
| 26 | VCC | power_in | System power supply input (3.3V). |
| 27 | C2- | passive | Voltage inverter external capacitor connection (RS-232); not needed if both ports are in RS-485 mode. |
| 28 | C2+ | passive | Voltage inverter external capacitor connection (RS-232); not needed if both ports are in RS-485 mode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | RENESAS |
| Package | SSOP-28-208mil |
| Category | Interface ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| Driver Differential VOUT (with load, RS-422) | VOD2 | 2 | 2.3 |  | V | R = 50Ω (RS-422) (Figure 1) | 7 |
| Driver Differential VOUT (with load, RS-485) | VOD2 | 1.5 | 2 | 5 | V | R = 27Ω (RS-485) (Figure 1) | 7 |
| Driver Differential VOUT (common-mode load) | VOD3 | 1.5 |  | 5 | V | RD = 60Ω, R = 375Ω, VCM = -7V to 12V (Figure 1) | 7 |
| Change in Magnitude of Driver Differential VOUT | ΔVOD |  | 0.01 | 0.2 | V | R = 27Ω or 50Ω (Figure 1) | 7 |
| Driver Common-Mode VOUT | VOC |  |  | 3 | V | R = 27Ω or 50Ω (Figure 1) | 7 |
| Change in Magnitude of Driver Common-Mode VOUT | ΔVOC |  | 0.01 | 0.2 | V | R = 27Ω or 50Ω (Figure 1) | 7 |
| Driver Short-Circuit Current (RS-485) | IOS | 35 |  | 250 | mA | -7V ≤ (VY or VZ) ≤ 12V | 7 |
| Driver Three-State Output Leakage Current | IOZ |  |  | 200 | µA | Outputs Disabled, VCC = 0V or 3.6V, VOUT = 12V | 7 |
| Driver Three-State Output Leakage Current | IOZ | -200 |  |  | µA | Outputs Disabled, VCC = 0V or 3.6V, VOUT = -7V | 7 |
| RS-232 Driver Output Voltage Swing | VO | 5 |  |  | V | All TOUTS Loaded with 3kΩ to Ground | 7 |
| RS-232 Driver Output Short-Circuit Current | IOS | -60 |  | 60 | mA | VOUT = 0V | 7 |
| Input High Voltage | VIH1 | 2.2 |  |  | V | Full temp | 7 |
| Input Low Voltage | VIL1 |  |  | 0.8 | V | Full temp | 8 |
| Input Current | IIN1 | -2 |  | 2 | µA | Pins Without Pull-ups or Pull-downs | 8 |
| Input Current | IIN2 | -25 |  | 25 | µA | LB, ON/OFF, DE | 8 |
| RS-485 Receiver Differential Threshold Voltage | VTH | -0.2 |  | -0.04 | V | -7V ≤ VCM ≤ 12V, Full Failsafe | 8 |
| RS-485 Receiver Input Hysteresis | VTH |  | 35 |  | mV | VCM = 0V, 25°C | 8 |
| RS-485 Receiver Input Current (A, B) | IIN |  |  | 0.8 | mA | VCC = 0V or 3.0 to 3.6V, VIN = 12V | 8 |
| RS-485 Receiver Input Current (A, B) | IIN | -0.64 |  |  | mA | VCC = 0V or 3.0 to 3.6V, VIN = -7V | 8 |
| RS-485 Receiver Input Resistance | RIN | 15 |  |  | kΩ | -7V ≤ VCM ≤ 12V, VCC = 0 or 3.0V ≤ VCC ≤ 3.6V | 8 |
| RS-232 Receiver Input Voltage Range | VIN | -25 |  | 25 | V | Full temp | 8 |
| RS-232 Receiver Input Threshold Low | VIL |  | 1.1 | 0.8 | V | Full temp | 8 |
| RS-232 Receiver Input Threshold High | VIH | 2.4 | 1.6 |  | V | Full temp | 8 |
| RS-232 Receiver Input Hysteresis | VTH |  | 0.5 |  | V | 25°C | 8 |
| RS-232 Receiver Input Resistance | RIN | 3 | 5 | 7 | kΩ | VIN = 15V, VCC Powered Up | 8 |
| Receiver Output Low Voltage | VOL |  | 0.2 | 0.4 | V | IO = 5mA | 8 |
| Receiver Short-Circuit Current | IOSR | 7 |  | 85 | mA | 0V ≤ VO ≤ VCC | 8 |
| Receiver Three-State Output Current | IOZR |  |  | 10 | µA | Output Disabled, 0V ≤ VO ≤ VCC | 8 |
| Unused Receiver (RB) Pull-Up Resistance | ROBZ |  | 40 |  | kΩ | ON/OFF = VCC, SELX = VCC (RS-485 Mode), 25°C | 8 |
| No-Load Supply Current (RS-232) | ICC232 |  | 3.7 | 7 | mA | SEL1 or SEL2 = GND, LB = ON/OFF = VCC | 8 |
| No-Load Supply Current (RS-485) | ICC485 |  | 1.6 | 5 | mA | SEL 1 & 2 = LB = DE = ON/OFF = VCC | 8 |
| Shutdown Supply Current (RS-232) | ISHDN232 |  | 45 | 100 | µA | ON/OFF = SELX = GND, LB = VCC | 8 |
| Shutdown Supply Current (RS-485, SSOP) | ISHDN485 |  | 35 | 80 | µA | ON/OFF = DEX = GND, SELX = LB = VCC, SSOP | 8 |
| ESD Bus Pins (A, B, Y, Z) HBM |  |  | 15 |  | kV | Any Mode, Human Body Model, 25°C | 8 |
| ESD All Other Pins HBM |  |  | 2.5 |  | kV | Human Body Model, 25°C | 8 |
| ESD All Other Pins MM |  |  | 200 |  | V | Machine Model, 25°C | 8 |
| RS-232 Driver Slew Rate | SR |  | 20 | 30 | V/µs | RL = 3kΩ, 3V to -3V, CL ≈ 15pF | 9 |
| RS-232 Driver Slew Rate | SR | 4 | 9 |  | V/µs | RL = 3kΩ, 3V to -3V, CL ≈ 2500pF | 9 |
| RS-232 Driver Propagation Delay | tDPHL |  | 1 | 2 | µs | RL = 3kΩ, CL = 1000pF (Figure 6) | 9 |
| RS-232 Driver Propagation Delay | tDPLH |  | 1.2 | 2 | µs | RL = 3kΩ, CL = 1000pF (Figure 6) | 9 |
| RS-232 Driver Enable Time from Shutdown | tDENSD |  | 25 |  | µs | VOUT = 3.0V, CL = 1000pF, 25°C | 9 |
| RS-232 Driver Maximum Data Rate | DRD | 250 | 400 |  | kbps | RL = 3kΩ, CL = 500pF, One Transmitter Switching on Each Port | 9 |
| RS-232 Receiver Propagation Delay | tRPHL |  | 40 | 120 | ns | CL = 15pF (Figure 7) | 9 |
| RS-232 Receiver Propagation Delay | tRPLH |  | 58 | 120 | ns | CL = 15pF (Figure 7) | 9 |
| RS-485 Driver Differential Input to Output Delay (fast) | tDLH, tDHL | 10 | 20 | 35 | ns | RDIFF = 54Ω, CL = 100pF (Figure 2) | 9 |
| RS-485 Driver Output Skew (fast) | tSKEW |  | 2 | 10 | ns | RDIFF = 54Ω, CL = 100pF (Figure 2) | 9 |
| RS-485 Driver Differential Rise or Fall Time (fast) | tR, tF | 3 | 20 | 30 | ns | RDIFF = 54Ω, CL = 100pF (Figure 2) | 9 |
| RS-485 Driver Maximum Data Rate (fast) | fMAX | 20 | 35 |  | Mbps | RDIFF = 54Ω, CL = 100pF (Figure 2) | 9 |
| RS-485 Receiver Input to Output Delay | tPLH, tPHL | 20 | 45 | 70 | ns | (Figure 4) | 10 |
| RS-485 Receiver Skew | tSKEW |  | 3 | 10 | ns | /tPLH - tPHL/ (Figure 4) | 10 |
| RS-485 Receiver Maximum Data Rate | fMAX | 20 | 40 |  | Mbps |  | 10 |
| Supply Voltage (VCC to Ground) | VCC |  |  | 7 | V | TA = +25°C | 7 |
| Input Voltages All Except A, B |  | -0.5 |  | 7 | V |  | 7 |
| Input/Output Voltages A, B (Any Mode) |  | -25 |  | 25 | V |  | 7 |
| Input/Output Voltages Y, Z (Any Mode) |  | -12.5 |  | 12.5 | V | One output at a time, IOUT ≤ 100mA for ≤ 10 mins | 7 |
| Maximum Junction Temperature (Plastic Package) |  |  |  | 150 | °C |  | 7 |
| Storage Temperature Range |  | -65 |  | 150 | °C |  | 7 |
| Supply Voltage Range | VCC | 3.15 | 3.3 | 3.45 | V | Test conditions VCC = 3.15V to 3.45V; typicals at 3.3V | 7 |
| Operating Temperature Range |  | -40 |  | 85 | °C |  | 7 |
| Thermal Resistance Junction to Ambient, 28 Ld SSOP | θJA |  | 60 |  | °C/W | Typical, 28 Ld SSOP Package | 7 |

## CAD (KiCad official)

- Symbol: `ISL3332IAZ`
- Footprint: `Package_SO:SSOP-28_5.3x10.2mm_P0.65mm`
- 3D model: SSOP-28-208mil (KiCad packages3D, STEP)
- 3D model files: `isl3332iaz-etched.step` / `isl3332iaz-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `isl3332iaz.step` / `isl3332iaz.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [RENESAS datasheet](docs/isl3332iaz-datasheet.pdf) (28 pp, sha256 `04894c599b496a1d`, retrieved 2026-10-27, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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](docs/isl3332iaz-datasheet.pdf)