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DS8921M

Public Made by Adom

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

componentinterfaceds8921mfactory-2.0.0extractor-text

Verified DS8921M

by Ray · last 11 Nov 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

11 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: DS8921M · SOIC-8 · 8 pins
  • ✓copper: 8 copper pads, none touching another net
  • ✓datasheet: all 8 pin names found in the 22-page datasheet
  • ✓distributor: lcsc C133584, digikey 2156-DS8921M-ND, mouser 926-DS8921M
  • ✓family: SOIC-8_3.9x4.9mm_P1.27mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-swhvbnih/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
  • ✓symbol_text: no pin names collide
  • ✓viewers: viewers/footprint.html 24 kB, viewers/symbol.html 10 kB
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ ds8921m.kicad_sym✓ ds8921m.kicad_mod✓ ds8921m.step
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Ray Publish 0.1.0 c32b29d

DS8921M

Texas Instruments · RS-485 / RS-422 ICs · SOIC-8

DS8921M from Texas Instruments, 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 VCC power_in Power supply pin; the datasheet specifies a 5-V supply.
2 RO output Receiver output pin; the absolute maximum receiver output sink current is 50 mA.
3 DI input TTL/CMOS compatible driver input.
4 GND power_in Power ground pin.
5 DO- output Inverting differential driver output, complementary to DO+.
6 DO+ output Non-inverting differential driver output, complementary to DO-.
7 RI- input Inverting differential receiver input; the absolute maximum receiver input voltage is -10 V to 10 V.
8 RI+ input Non-inverting differential receiver input; the absolute maximum receiver input voltage is -10 V to 10 V.

Key specifications

Parameter Value
Manufacturer Texas Instruments
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 input voltage -0.5 7 V 3
Supply voltage 7 V 3
Output voltage 5.5 V 3
Receiver output sink current 50 mA 3
Receiver input voltage -10 10 V 3
Differential input voltage -12 12 V 3
Maximum package power dissipation, D package 730 mW at 25°C 3
Derate D package above 25°C 9.3 mW/°C above 25°C 3
Lead temperature 260 °C Soldering, 4 sec. 3
Maximum junction temperature 150 °C 3
Storage temperature Tstg -65 165 °C 3
Supply voltage 4.5 5.5 V 4
Temperature (TA): DS8921/DS8921A TA 0 70 °C DS8921/DS8921A 4
Threshold voltage (receiver) VTH -200 35 200 mV −7 V ≤ VCM ≤ +7 V 4
Receiver input hysteresis VHYST 15 70 mV −7 V ≤ VCM ≤ +7 V 4
Receiver input resistance RIN 4 6 kΩ VIN = −7 V, +7 V, (Other Input = GND) 4
Receiver input current IIN 3.25 mA VIN = 10 V 4
Receiver input current IIN -3.25 mA VIN = −10 V 4
Receiver high-level output voltage VOH 2.5 V IOH = −400 μA 4
Receiver low-level output voltage VOL 0.5 V IOL = 8 mA 4
Receiver short-circuit current ISC -100 -15 mA VCC = MAX, VOUT = 0 V 4
Driver high-level input voltage VIH 2 V 4
Driver low-level input voltage VIL 0.8 V 4
Driver low-level input current IIL -200 -40 μA VCC = MAX, VIN = 0.4 V 4
Driver high-level input current IIH 20 μA VCC = MAX, VIN = 2.7 V 4
Driver input current II 100 μA VCC = MAX, VIN = 7.0 V 4
Driver input clamp voltage VCL -1.5 V VCC = MIN, IIN = −18 mA 4
Driver high-level output voltage VOH 2.5 V VCC = MIN, IOH = −20 mA 4
Driver low-level output voltage VOL 0.5 V VCC = MIN, IOL = +20 mA 4
Driver off-state output current IOFF 100 μA VCC = 0V, VOUT = 5.5 V 4
Differential output voltage magnitude difference /VT/, /VT/ 0.4 V 4
Differential output voltage VT 2 V 4
Offset voltage difference /VOS, VOS/ 0.4 V 4
Driver short-circuit current ISC -150 -30 mA VCC = MAX, VOUT = 0 V 4
Supply current ICC 35 mA VCC = MAX, VOUT = Logic 0 4
Receiver propagation delay low-to-high tpLH 14 22.5 ns CL = 30 pF (Figure 3 and Figure 4) 5
Receiver propagation delay high-to-low tpHL 14 22.5 ns CL = 30 pF (Figure 3 and Figure 4) 5
Receiver propagation delay skew /tpLH-tpHL/ 0.5 5 ns CL = 30 pF (Figure 3 and Figure 4) 5
Driver single-ended propagation delay low-to-high tpLH 10 15 ns CL = 30 pF (Figure 5 and Figure 6) 5
Driver single-ended propagation delay high-to-low tpHL 10 15 ns CL = 30 pF (Figure 5 and Figure 6) 5
Driver low-to-high transition time tTLH 5 8 ns CL = 30 pF (Figure 9 and Figure 10) 5
Driver high-to-low transition time tTHL 5 8 ns CL = 30 pF (Figure 9 and Figure 10) 5
Driver output skew Skew 1 5 ns CL = 30 pF(1) 5
Driver differential propagation delay low-to-high tpLH 10 15 ns CL = 30 pF (Figure 5, Figure 7, and Figure 8) 5
Driver differential propagation delay high-to-low tpHL 10 15 ns CL = 30 pF (Figure 5, Figure 7, and Figure 8) 5
Driver differential propagation delay skew /tpLH-tpHL/ 0.5 6 ns CL = 30 pF (Figure 5, Figure 7, and Figure 8) 5

CAD (KiCad official)

  • Symbol: DS8921M
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: ds8921m-etched.step / ds8921m-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ds8921m.step / ds8921m.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (22 pp, sha256 95f64368dde2ce85, retrieved 2026-11-11, 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