U1 vs IC1 Comparison

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1:37

Organizing project components.

Reviewing the bill of materials.

Analyzing the schematic.

Looking for "absolute maximum ratings, supply voltage range, LIN bus voltage range, output current, inhibit current, operating conditions, electrical characteristics, features, package pinout" in TJA1021.pdf

Looking for "absolute maximum ratings, supply voltage range, LIN bus voltage range, output current, inhibit current, operating conditions, electrical characteristics, features, package pinout" in tlin1021a-q1.pdf

Comparison of U1 vs IC1

CategoryU1IC1Main difference
PartU1IC1Different vendors: NXP vs TI
FunctionLIN transceiverLIN transceiverSame basic role
LIN standard supportLIN 2.x / ISO 17987-4:2016 / SAE J2602LIN 2.0 / 2.1 / 2.2 / 2.2A / ISO 17987-4 / SAE J2602-1Very similar compliance; IC1 explicitly lists more LIN revisions
Automotive qualificationNot explicitly called out in the extracted sectionAEC-Q100 Grade 1, Functional Safety-CapableIC1 is more explicitly automotive-qualified
Operating supply voltage5.5 V to 27 V on VBAT4.5 V to 36 V on VSUPIC1 has a much wider operating supply range
Absolute max supply voltage-0.3 V to +40 V-0.3 V to +45 VIC1 tolerates higher supply stress
Recommended LIN bus voltageStatic characteristics given for VBAT 5.5 V to 27 V0 V to 36 VIC1 supports wider bus operating voltage
Absolute max LIN bus voltage-40 V to +40 V-45 V to +45 VIC1 is more fault-tolerant on LIN
Load dump / fault toleranceISO 7637 transient protection, short-circuit proof to battery and groundExplicit 42 V load dump support, ±45 V LIN fault tolerantIC1 is stronger on published fault tolerance
Logic input compatibilityCompatible with 3.3 V and 5 V devicesLogic pins specified for 0 V to 5.25 VU1 explicitly calls out 3.3 V compatibility; IC1 gives tighter logic-voltage limits
RXD outputOpen-drain, 1.5 mA min low-level sinkOpen-drain, 1.5 mA low-level sink, 0.6 V max low levelSimilar drive capability
INH output current-50 mA to +15 mA absolute max4 mA absolute maxU1 can drive a much heavier INH load
INH behaviorSwitch resistance VBAT-to-INH: 20 typ / 50 max ohmsINH high-level drop vs VSUP: 0.5 V to 1 V at -0.5 mADifferent output characterization; U1 looks more suitable for stronger regulator-enable sourcing
Sleep current2 typ / 7 typ? / 10 max uA listed as 2 / 7 / 10 uA depending on min/typ/maxINH leakage in sleep -0.5 to 0.5 uA; full sleep supply current not in extracted sectionU1 has more complete low-power current data in the extracted content
Standby current150 / 450 / 1000 uA recessiveNot captured in extracted sectionU1 gives clearer standby current numbers here
Normal-mode supply current300 / 800 / 1600 uA recessive, 1 / 2 / 4 mA dominantNot captured in extracted sectionU1 has more extracted current-consumption detail
TXD logic thresholdsVIH 2 V to 7 V, VIL -0.3 V to 0.8 V, hysteresis 50 / 200 / 400 mVVIH 2 V min, VIL 0.8 V max, pull-down 125 / 350 / 800 kOhmVery similar digital thresholds; U1 gives explicit hysteresis spread
Enable / sleep control pin~SLP~ active-low sleep controlEN enable / sleep controlSame function class, different polarity and naming
WAKE pin thresholdsVIH VBAT - 1 V to VBAT + 0.3 V, VIL -0.3 V to VBAT - 3.3 VVIH VSUP - 1.8 V, VIL VSUP - 3.85 VThresholds differ; firmware and interface assumptions may not port 1:1
LIN pull-up / terminationIntegrated termination resistor, extracted values 20 / 30 / 47 kOhmIntegrated pull-up 20 / 45 / 60 kOhm, feature summary says 45 kOhm nominalPull-up network values differ
LIN capacitance30 pF max25 pFIC1 is slightly lower
Data rateUp to 20 kBdTX up to 20 kbps, RX up to 100 kbpsIC1 explicitly supports faster receive path
Temperature rangeJunction / virtual junction -40 C to +150 CJunction -40 C to +150 C operating, abs max to 165 CSimilar operating range; IC1 has higher absolute max junction rating
ESD robustnessExplicit: +-6 kV IEC 61000-4-2 on LIN/VBAT/WAKE, stronger HBM/CDM detailProtection features listed, but less ESD detail in extracted sectionU1 provides more explicit ESD numbers
Package / footprint style in project8-pin device with dual GND pins in the symbol8-pin device plus EP on pin 9 in the symbolPin-count presentation differs in your schematic symbols

Pinout comparison

Pin #U1IC1Difference
1RXDRXDSame
2~SLP~ENSame control role class, but different naming and likely different logic interpretation
3~WAKE~WAKESimilar purpose, naming polarity differs
4TXDTXDSame
5GNDGNDSame
6LINLINSame
7VBATVSUPSame supply role, different naming
8INHINHSame
9GNDEPMajor package difference in the current symbols: U1 shows a second GND pin, while IC1 shows an exposed pad

Main takeaways

TopicSummary
Best electrical robustnessIC1
Best supply-voltage flexibilityIC1 with 4.5 V to 36 V operation
Stronger INH output capabilityU1
Better-extracted low-power current detailU1
More automotive-specific positioningIC1
Biggest practical migration riskControl-pin semantics and the package/pad difference at pin 9
The biggest differences are:
  • IC1 is electrically wider-range and more fault-tolerant.
  • U1 has a much stronger INH output capability.
  • The control pins are not a drop-in semantic match: ~SLP~ vs EN, and ~WAKE~ vs WAKE.
  • Your symbols also differ at pin 9: U1 has a second ground pin, while IC1 has an exposed pad.
If you want, I can also make a second table that is strictly parameter-by-parameter with only numeric electrical specs side by side.
Numeric-only comparison table
Check symbol mismatches
Compare standby behavior
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IC2
Manufacturer Part Number
TJA1021BT/0Z
U1
Not Recommended for New Designs
Manufacturer Part Number
TJA1021TK/20/C,118
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