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BST SMD Reed Sensor (BP4 Series) is a surface-mount magnetic proximity sensor designed for compact electronic devices and PCB-based applications.
Based on reed switch technology, it offers reliable switching performance, zero standby power consumption, and excellent long-term stability.
With its miniature SMD package, BP4 series is ideal for space-limited designs, enabling direct PCB mounting through reflow soldering. Multiple sensitivity options are available to meet different magnetic sensing requirements.
| Part Number | Contact Configuration | Operate Range | Contact Rating | Switching Voltage | Switching Current | Body Size (mm) | Special Feature |
| BP4-018-A-J | SPST-NO | 66~114 AT | 10 W | 200 V | 1.0 A | 18.00*2.50*3.75 | J Bend |
| BP4-018-B-J | SPST-NC | 42~84 AT | 10 W | 100 V | 0.5 A | 18.00*3.70*3.40 | J Bend |
| BP4-016-A-G | SPST-NO | 37~59 AT | 10 W | 180 V | 0.5 A | 16.00*2.50*2.50 | Gull Wing Short |
| BP4-016-A-A | SPST-NO | 45~80 AT | 10 W | 180 V | 0.5 A | 16.00*2.50*2.50 | Axial |
| BP4-011-A-A | SPST-NO | 10~15 AT | 20 W | 200 V | 0.4 A | 11.60*2.30*2.30 | Axial |
| BP4-011-A-G | SPST-NO | 20~47 AT | 20 W | 200 V | 0.4 A | 11.60*2.30*2.30 | Gull Wing Short |
| BP4-008-A-G | SPST-NO | 38~54 AT | 10 W | 100 V | 0.5 A | 8.50*2.10*2.10 | Gull Wing Short |
| BP4-008-A-J | SPST-NO | 50~66 AT | 10 W | 100 V | 0.5 A | 8.50*2.10*2.10 | J Bend |
| BP4-008-A-A | SPST-NO | 44~60 AT | 10 W | 100 V | 0.5 A | 8.50*2.10*2.10 | Axial |
Ultra-compact SMD package for PCB mounting
No standby power consumption
High reliability and long mechanical life
Fast switching response
Compatible with standard reflow soldering processes
Multiple magnetic sensitivity options
Wide operating temperature range
Suitable for high-density electronic assemblies
RoHS & REACH compliant
Read more reed sensor related blogs:
| What Is a Reed Sensor |
| How Does a Reed Switch Work |
| Reed Switch Vs Hall Effect Sensor |
| Reed Switch Reliability |
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