Precision Op-Amps · Issue 04
NRND
OP27
OP27 is NRND. The precision op-amp field, noise, offset, stability, from public data only.
OP37 · OPA227 · AD797 · AD8671
Category
4 TEARDOWNS
Parts Teardown
A neutral fit-catch on obsolete parts and their real crosses, the package, the pinout, the rail, the pin that moved. Read from public sources only. Candidates named here are ones to validate in your own system, never drop-in equivalents.
CAN Transceivers
End of Life · NXP
TJA1050
NXP's TJA1050 CAN transceiver is end-of-life. Three current crosses, three different compromises, the TJA1057, TJA1051 and SN65HVD230 compared from public sources only.
TJA1057 · TJA1051 · SN65HVD230
The crosses
| Obsolete | TJA1050 | EOL |
| Current-gen | TJA1057 | Best |
| Closest | TJA1051 | pin 5 |
| 3.3V rail | SN65HVD230 | rail |
Package & pinout · TJA1050
SOIC-8 / DIP-8
Where the crosses diverge
The footprint is common to all four. The function on pin 5 is not, it is the single detail that decides whether a cross drops in or forces a change.
| Part | Pin 5 | Effect |
|---|---|---|
| TJA1050 | Vref (ref. output) | obsolete |
| TJA1057 | Vref / VIO variant | drop-in |
| TJA1051 | Split / S-mode | check |
| SN65HVD230 | Rs (slope/standby) | redesign |
Confirm pin 5 against your schematic before ordering. Pin functions are vendor-reported and not independently audited.
All teardowns
Gate-Driver Optos · Issue 03
Obsolete
TLP250
Every live cross drives more current and adds undervoltage lockout. Same DIP, different drive.
HCPL-3120 · TLP352
CAN Transceivers · Issue 02
Obsolete
MCP2551
Obsolete in SOIC. The obvious cross sets up two more problems, 3.3V, and pin-5 twice over.
MCP2561 · SN65HVD230 · SN65HVD251
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