
CJ125B
oxygen-sensor control and evaluation IC for Bosch LSU wideband lambda sensors
Key details
| Part Number | CJ125B |
|---|---|
| Manufacturer | Bosch |
| Category | Oxygen Sensor Interface IC |
| Lifecycle Status | Production |
| Series | CJ125 |
| Package / Case | 32-lead LQFP, 7 mm × 7 mm |
| Pin Count | 32 |
| Operating Temperature | -40°C to +150°C junction |
| Last Verified | 2026-07-19 |
Part information
CJ125B Overview
CJ125B is a Bosch oxygen-sensor control and evaluation IC for Bosch LSU wideband lambda sensors supplied in 32-lead LQFP, 7 mm × 7 mm. This page uses the exact orderable code because package, grade, temperature and option suffixes can change compatibility.
Key Technical Specifications
| Supported Sensors | Bosch LSU 5.2, LSU 4.9, LSU ADV and LSU 4.2 |
|---|---|
| Interface | SPI |
| Functions | Lambda measurement, heater control and diagnostics |
| Package Size | 7 mm × 7 mm |
| Application | Automotive exhaust-gas oxygen sensing |
Package and Ordering Notes
The listed package is 32-lead LQFP, 7 mm × 7 mm with 32 pins, leads, lands or contacts. The featured image is a generic package illustration for form-factor identification and is not an actual date-code or lot photograph. The part or family is listed by Bosch as Production at the verification date.
Sourcing Guidance
Confirm current factory lead time, packing format and revision for CJ125B before placing the order.
For an accurate quotation, include the full MPN, target quantity, acceptable date-code range, packaging format and destination. Icearth can help review traceability documents, label photos and electrical/package alignment before order placement.
Manufacturer Documentation
Technical values were checked against Bosch documentation. Use the linked datasheet as the controlling source and re-check revisions before PCB release or firmware qualification.
Lifecycle and sourcing review
Lifecycle information is shown for reference. Confirm current manufacturer documentation, availability and technical suitability before purchase.
Confirm current factory lead time, packing format and revision for CJ125B before placing the order.