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ADM4850ARMZ-TUDI
Public Made by Adomby adom
Tudi RS-485 / RS-422 ICs, MSOP-8. 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
markdownADM4850ARMZ-TUDI
Tudi · RS-485 / RS-422 ICs · MSOP-8
ADM4850ARMZ-TUDI from Tudi, in a MSOP-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: when /RE is low, RO is high if A-B ≥ -50 mV and low if A-B ≤ -200 mV, and it is high-Z when /RE is high. |
| 2 | /RE | input | Active-low receiver output enable: RO is enabled when /RE is low and high-Z when /RE is high, and with /RE high and DE low the device enters low-power shutdown. |
| 3 | DE | input | Driver output enable: the driver outputs are active when DE is high and high-Z when DE is low, and with /RE high and DE low the device enters low-power shutdown. |
| 4 | DI | input | Driver input: while DE is high, a low on DI drives A low and B high, and a high on DI drives A high and B low. |
| 5 | GND | power_in | Ground reference for the device; all voltages are referenced to this pin. |
| 6 | A | bidirectional | Non-inverting receiver input and non-inverting driver output on the RS-485 bus. |
| 7 | B | bidirectional | Inverting receiver input and inverting driver output on the RS-485 bus. |
| 8 | VCC | power_in | Supply pin, operating range 4.75 V to 5.25 V per the datasheet, with an absolute maximum of +7 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Tudi |
| Package | MSOP-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 |
|---|---|---|---|---|---|---|---|
| Supply voltage | VCC | 7 | V | 2 | |||
| Control port voltage (/RE, DE, DI) | -0.3 | V | 2 | ||||
| Bus-side input voltage (A, B) | -7 | 13 | V | 2 | |||
| Receiver output voltage (RO) | -0.3 | V | 2 | ||||
| Storage operating temperature range | -60 | 150 | ℃ | 2 | |||
| Soldering temperature range | 300 | ℃ | 2 | ||||
| Operating temperature range | -40 | 85 | ℃ | 2 | |||
| Operating supply voltage range | VCC | 4.75 | 5.25 | V | 1 | ||
| Driver differential output (no load) | VOD1 | 5 | V | no load | 3 | ||
| Driver differential output (RL = 50 Ω) | VOD2 | 2 | V | 图 2，RL = 50 Ω | 3 | ||
| Change in differential output voltage magnitude | ∆VOD | 0.2 | V | 图 2，RL = 27 Ω | 3 | ||
| Driver common-mode output voltage | VOC | 3 | V | 图 2，RL = 27 Ω | 3 | ||
| Change in common-mode output voltage magnitude | ∆VOC | 0.2 | V | 图 2，RL = 27 Ω | 3 | ||
| High-level input voltage | VIH | 2 | V | DE，DI，/RE | 3 | ||
| Low-level input voltage | VIL | 0.8 | V | DE，DI，/RE | 3 | ||
| Logic input current | IIN1 | -2 | 2 | uA | DE，DI，/RE | 3 | |
| Driver output short-circuit current, short to high | IOSD1 | 35 | 250 | mA | 短路到 0V~12 V | 3 | |
| Driver output short-circuit current, short to low | IOSD2 | -250 | -35 | mA | 短路到-7V~0V | 3 | |
| Bus input current (A, B) at VIN = 12 V | IIN2 | 125 | uA | DE = 0 V，VCC=0 或 5V，VIN = 12 V | 3 | ||
| Bus input current (A, B) at VIN = -7 V | IIN2 | -100 | uA | DE = 0 V，VCC=0 或 5V，VIN = -7 V | 3 | ||
| Positive input threshold voltage | VIT+ | -50 | mV | -7V≦VCM≦12V | 3 | ||
| Reverse input threshold voltage | VIT- | -200 | mV | -7V≦VCM≦12V | 3 | ||
| Input hysteresis voltage | Vhys | 10 | 30 | mV | -7V≦VCM≦12V | 3 | |
| Low-level output voltage | VOL | 0.4 | V | IOUT = +4mA，VID = -200 mV | 3 | ||
| Three-state input leakage current | IOZR | -1 | 1 | uA | 0.4 V < VO < 2.4 V | 4 | |
| Receiver input resistance | RIN | 96 | kΩ | -7V≦VCM≦12V | 4 | ||
| Receiver short-circuit current | IOSR | -95 | 7 | 95 | mA | 0 V≤VO≤VCC | 4 |
| Supply current (driver and receiver enabled) | ICC | 180 | 500 | uA | /RE=0V 或 VCC, DE = 0 | 4 | |
| Supply current (receiver disabled, driver disabled) | ICC | 170 | 400 | uA | /RE=VCC, DE=VCC | 4 | |
| Shutdown current | ISHDN | 0.5 | 10 | uA | DE=0 V，/RE=VCC | 4 | |
| ESD HBM rating (A, B) | -15 | 15 | KV | A、B 人体模型 HBM | 4 | ||
| ESD IEC 61000-4-2 contact discharge (A, B) | -15 | 15 | KV | A、B 接触放电 IEC61000-4-2 | 4 | ||
| Driver input-to-output propagation delay (low to high) | tDPLH | 1000 | ns | RDIFF = 54 Ω, CL1=CL2=100pF | 4 | ||
| Driver input-to-output propagation delay (high to low) | tDPHL | 1000 | ns | RDIFF = 54 Ω, CL1=CL2=100pF | 4 | ||
| Propagation delay skew (driver) | tSKEW1 | -100 | 100 | ns | 4 | ||
| Driver rise/fall time | tDR, tDF | 200 | 500 | 700 | ns | 4 | |
| Driver enable to output high | tDZH | 2500 | ns | CL = 100 pF, S1 闭合（见图 5、6） | 4 | ||
| Driver enable to output low | tDZL | 2500 | ns | 4 | |||
| Driver input low to disable | tDLZ | 100 | ns | CL = 15 pF, S2 闭合（见图 5、6） | 4 | ||
| Driver input high to disable | tDHZ | 100 | ns | 4 | |||
| Driver enable to output high in shutdown | tDZH(SHDN) | 4500 | ns | CL = 15 pF, S2 闭合（见图 5、6） | 4 | ||
| Driver enable to output low in shutdown | tDZL(SHDN) | 4500 | ns | CL = 15 pF, S1 闭合（见图 5、6） | 4 | ||
| Receiver input-to-output propagation delay (low to high) | tRPLH | 127 | 200 | ns | 见图 7 与图 8，VID≥2.0V，上升与下降沿时间 VID≤15ns | 5 | |
| Receiver input-to-output propagation delay (high to low) | tRPHL | 127 | 200 | ns | 见图 7 与图 8 | 5 | |
| Propagation delay skew (receiver) | tSKEW2 | 3 | 30 | ns | 见图 7 与图 8 | 5 | |
| Receiver enable to output low | tRZL | 20 | 50 | ns | CL = 100 pF, S1 闭合（见图 9,10） | 5 | |
| Receiver enable to output high | tRZH | 20 | 50 | ns | CL = 100 pF, S2 闭合（见图 9,10） | 5 | |
| Receiver output low to disable | tRLZ | 20 | 50 | ns | CL = 100 pF, S1 闭合（见图 9,10） | 5 | |
| Receiver output high to disable | tRHZ | 20 | 50 | ns | CL = 100 pF, S2 闭合（见图 9,10） | 5 | |
| Receiver enable to output high in shutdown | tRZH(SHDN) | 3500 | ns | CL = 100 pF, S2 闭合（见图 9,10） | 5 | ||
| Receiver enable to output low in shutdown | tRZL(SHDN) | 3500 | ns | CL = 100 pF, S1 闭合（见图 9,10） | 5 | ||
| Time to enter shutdown | tSHDN | 50 | 200 | 600 | ns | NOTE2 | 5 |
CAD (KiCad official)
- Symbol:
ADM4850ARMZ-TUDI - Footprint:
Package_SO:MSOP-8_3x3mm_P0.65mm - 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files:
adm4850armz-tudi-etched.step/adm4850armz-tudi-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);adm4850armz-tudi.step/adm4850armz-tudi.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Tudi datasheet (9 pp, sha256
92f49a1a0a2e310d, retrieved 2026-10-17, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- 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).