ST-01BH Equivalent & Substitute Parts

Part Overview

The ST-01BH is a magnetic buzzer transducer manufactured by Soberton Inc., designed as an externally driven surface mount component with a 11×14mm footprint. This part operates at 2.73kHz with a 70mA supply current across a 2–4V voltage range and features IP65 ingress protection. The ST-01BH is classified as obsolete, making identification of compatible substitute components essential for ongoing production and maintenance applications.

Substiute Parts

ST-01BH

Soberton Inc.In Stock: 1199ST-01BH Datasheet

Current PartRFQ

SMT-1427-S-3-R

PUI Audio, Inc.In Stock: 7057SMT-1427-S-3-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The SMT-1427-S-3-R from PUI Audio, Inc. qualifies as a direct substitute for the ST-01BH based on the following alignment of critical parameters:

Mechanical Compatibility:

• Identical footprint: 11.00mm × 14.00mm
• Surface mount solder pad termination
• Similar seated height (4.60mm vs. 3.00mm maximum)

Electrical Compatibility:

• Magnetic transducer technology with externally driven operation
• Frequency specification within acceptable tolerance (2.7kHz vs. 2.73kHz)
• Voltage range overlap (3–4.5V encompasses the upper portion of the ST-01BH 2–4V range)
• Single tone operating mode

Compliance & Status:

• Active product status (vs. obsolete ST-01BH)
• ROHS3 compliant
• Identical HTSUS and ECCN classifications

Parameter Comparison

Engineering Selection Recommendations

The SMT-1427-S-3-R is the designated substitute for the obsolete ST-01BH. Selection of this substitute is supported by:

Product Availability: The ST-01BH is obsolete with no ongoing manufacturing. The SMT-1427-S-3-R is an active product with established supply chain availability (7040 pcs in stock).

Compliance Alignment: Both components meet ROHS3 requirements and share identical HTSUS and ECCN classifications, ensuring regulatory consistency in procurement and deployment.

Mechanical Fit: Identical PCB footprint and solder pad termination enable direct board-level substitution without layout modification. The 0.50mm increase in seated height (4.60mm vs. 3.00mm) remains within typical assembly clearance tolerances for surface mount applications.

Electrical Performance: The SMT-1427-S-3-R operates within the voltage range of the original design. The 20mA increase in supply current (90mA vs. 70mA) and frequency tolerance of 0.03kHz represent minor operational differences that do not preclude functional equivalence in externally driven transducer applications.

Frequently Asked Questions (FAQ)

Q: Can the SMT-1427-S-3-R be used as a direct replacement for the ST-01BH without PCB modifications?

A: Yes. Both components share identical footprint dimensions (11.00mm × 14.00mm) and solder pad termination. No PCB layout changes are required for substitution.

Q: What is the impact of the 20mA current increase (70mA to 90mA) on circuit design?

A: The increased supply current must be accommodated by the external driver circuitry. Verify that the driver circuit can supply 90mA at the operating voltage. This is a design consideration, not a compatibility barrier.

Q: Does the 0.50mm height difference affect assembly or clearance?

A: The SMT-1427-S-3-R seated height of 4.60mm is 0.50mm taller than the ST-01BH. Confirm clearance in your specific assembly environment, particularly if height-constrained applications are involved.

Q: Is the SMT-1427-S-3-R suitable for applications requiring IP65 ingress protection?

A: The SMT-1427-S-3-R ingress protection rating is not specified in available documentation. If IP65 protection is a functional requirement, this parameter must be confirmed with the manufacturer before deployment.

Q: What is the frequency tolerance between the two components?

A: The frequency difference is 0.03kHz (2.73kHz vs. 2.7kHz), representing a 1.1% variance. This falls within typical acoustic transducer tolerances and does not affect functional equivalence in single-tone applications.

Q: Are there supply chain advantages to using the SMT-1427-S-3-R?

A: Yes. The SMT-1427-S-3-R is an active product with 7040 units in stock, compared to the obsolete ST-01BH. This ensures long-term availability and supports ongoing production schedules.