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Part Review - MICS-5914
Date: 2026-07-14
Scope
Reviewed available part information for the current published part project: MPN, manufacturer/package metadata, description, properties, symbol terminals, footprint, pad mapping, and datasheet consistency.
Datasheet
  • Official source found: SGX Sensortech / Amphenol SGX Sensortech MiCS-5914 datasheet, 1108 rev 4.
  • Datasheet URL set in the current project properties: https://www.sgxsensortech.com/content/uploads/2014/07/1108_Datasheet-MiCS-5914.pdf
  • Note: the Flux library search index still reported the published component as has_datasheet: false immediately after the update, so the indexed library result may lag the project property state.
Current Part Metadata Observed

Table

FieldCurrent value / observationDatasheet / official referenceAssessment
MPNMICS-5914MiCS-5914OK
ManufacturerSet to SGX SensortechSGX Sensortech / Amphenol SGX SensortechOK, though distributor branding often uses Amphenol SGX Sensortech
Part TypeSet to SensorCompact MOS / MEMS ammonia gas sensorAcceptable, could be more specific as gas sensor
Designator PrefixUSensor IC/module-style SMD partAcceptable
Datasheet URLSet to official SGX PDF URLOfficial PDF foundOK in project properties
DescriptionAmmonia (NH3) Sensor Analog title, but body says carbon monoxide / CO detectionMiCS-5914 is primarily an ammonia / NH3 sensorMismatch: CO wording is wrong and should be corrected
Package / footprint assetSON_CS-5914_SGX.kicad_mod; 3D model MICS-5914.stp5 x 7 x 1.55 mm SMD packageMechanically plausible; exact land-pattern validation incomplete
Datasheet Key Specs

Table

ParameterDatasheet value
TechnologyMOS / MEMS gas sensor
Primary gasAmmonia / NH3
Product-page range100-10,000 ppb NH3
Datasheet detectable NH3 range1-500 ppm
Typical NH3 full-scale range1-300 ppm
Heater voltage2.2 V typ.
Heater current30 mA typ.
Heater power66 mW typ.; 60-73 mW range
Heater resistance72 ohm typ.; 64-80 ohm range
Max heater power88 mW
Max sensing-layer power8 mW
Recommended supply4.9-5.1 V
Load resistor limitRLOAD >= 820 ohm minimum
Recommended 5 V heater series resistor93.1 ohm E96 typ.
Operating temperature-30 to +85 °C
Operating humidity5-95 %RH
Storage temperature-40 to +120 °C
Package size5 x 7 x 1.55 mm
Datasheet Pinout
The datasheet uses lettered pads, not numeric pads. It also skips the letter I.

Table

Datasheet padFunction / connection
Ablank / not assigned in datasheet
Bblank / not assigned in datasheet
CRh1
DRs1
Eblank / not assigned in datasheet
FRh2
GRs2
Hblank / not assigned in datasheet
Jblank / not assigned in datasheet
Kblank / not assigned in datasheet
Suggested pin metadata:

Table

PadSuggested Flux pin descriptionSuggested pin type
CHeater terminal Rh1Passive
FHeater terminal Rh2Passive
DSensor resistance terminal Rs1Passive
GSensor resistance terminal Rs2Passive
A, B, E, H, J, KNot assigned / NC per datasheet tableNot Connected or passive reserved/mechanical, depending library convention
Current Symbol / Terminal Check
Current schematic terminals observed: A, B, C, D, E, F, G, H, I, J.

Table

Current terminalCurrent pin numberDatasheet expectationAssessment
A1AOK label, description missing
B2BOK label, description missing
C3C = Rh1Label OK; missing Rh1 description/type
D4D = Rs1Label OK; missing Rs1 description/type
E5EOK label, description missing
F6F = Rh2Label OK; missing Rh2 description/type
G7G = Rs2Label OK; missing Rs2 description/type
H8HOK label, description missing
I9No datasheet pad IMismatch: should likely be J
J10J exists, K also expectedMismatch: terminal K missing; J likely shifted
Primary symbol issue: the terminal set should be A, B, C, D, E, F, G, H, J, K, with no I. The current symbol uses I and omits K.
All terminals currently have Pin Type: Unspecified; the important functional pins C/D/F/G should be described, and non-assigned pads should be explicitly marked as NC/reserved/mechanical according to the project library convention.
Footprint / Package Check
Observed footprint characteristics:
  • Footprint asset: SON_CS-5914_SGX.kicad_mod
  • SMD pads: 10 rectangular pads
  • Imported pad size: 0.5588 x 1.2954 mm
  • Fabrication outline: about 5.0038 x 7.0104 mm
  • Datasheet package size: 5 x 7 x 1.55 mm
Assessment:
  • The body outline matches the datasheet package size closely.
  • The pad count matches the 10 datasheet pads.
  • The imported footprint originally used numeric pads 1-10, while the current Flux pads/terminals are lettered A-J including I. The conversion appears to map numeric pad 1 -> A through numeric pad 10 -> J, which conflicts with the datasheet's skipped-I alphabetic sequence.
  • The datasheet text extraction did not expose a complete recommended land-pattern table, so pad dimensions and positions could not be fully verified against an authoritative numeric footprint drawing. The package outline is plausible, but the terminal naming/mapping must be corrected before relying on the part.
  • The datasheet configuration is shown as a bottom view; footprint orientation should be verified visually against the manufacturer drawing to ensure C/D/F/G are not mirrored or shifted.
Mismatches / Risks
  1. Description mismatch: current text says CO / carbon monoxide detection, but MiCS-5914 is an ammonia / NH3 sensor.
  2. Terminal naming mismatch: current symbol/footprint exposes I; datasheet skips I and uses K as the 10th pad.
  3. Missing pin descriptions: C/D/F/G need Rh1/Rs1/Rh2/Rs2 descriptions; NC/blank pads should be identified.
  4. Pin types are all unspecified; this weakens ERC/part review.
  5. Footprint body is plausible, but exact land-pattern dimensions were not fully verified from the datasheet OCR.
  6. Orientation risk remains because the datasheet pin configuration is a bottom view; physical mapping of C/D/F/G should be checked against the original drawing before publication/use.
  1. Correct the description to identify the part as an ammonia / NH3 MOS gas sensor, not a CO sensor.
  2. Rename/recreate terminals so the final terminal list is A, B, C, D, E, F, G, H, J, K.
  3. Assign pin descriptions: C=Rh1, D=Rs1, F=Rh2, G=Rs2.
  4. Mark A/B/E/H/J/K as NC or reserved/mechanical per the chosen Flux convention.
  5. Verify and, if needed, correct footprint pad labels so pad 9 is J and pad 10 is K rather than I/J.
  6. Visually verify top-vs-bottom orientation for C/D/F/G against the datasheet package drawing.

  • Scope

  • Datasheet

  • Current Part Metadata Observed

  • Datasheet Key Specs

  • Datasheet Pinout

  • Current Symbol / Terminal Check

  • Footprint / Package Check

  • Mismatches / Risks

  • Recommended Fixes