SC628D-1R Equivalent & Substitute Parts

Part Overview

The SC628D-1R is a piezoelectric panel mount buzzer manufactured by Mallory Sonalert Products Inc., designed for internally driven indicator applications. This component operates across a 6–28V DC voltage range, producing a 2kHz single-tone output at 60dB SPL (measured at 6V, 61cm distance) with a current draw of 5–18mA. The unit features a 42.85mm diameter form factor with screw terminal connectivity and is rated for operating temperatures between –30°C and 65°C.

The SC628D-1R is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades where this model is no longer procurable.

Key Parameters

Parameter	Value
Manufacturer	Mallory Sonalert Products Inc.
Technology	Piezo
Driver Circuitry	Indicator, Internally Driven
Input Type	DC
Voltage Range	6–28V
Frequency	2kHz
Operating Mode	Single Tone
Sound Pressure Level	60dB @ 6V, 61cm
Current Supply	5–18mA
Mounting Type	Panel Mount
Port Location	Top
Operating Temperature Range	–30°C to 65°C
Size / Diameter	42.85mm (1.687")
Height – Seated (Max)	35.54mm (1.399")
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SC628D-1R is determined by strict alignment across the following critical parameters:

Technology & Driver Type: Piezoelectric, internally driven indicator configuration
Electrical Specifications: DC input, 6–28V voltage range, 2kHz frequency, single-tone operation
Acoustic Output: 60dB SPL @ 6V, 61cm
Mechanical Form Factor: Panel mount configuration, top port location, diameter and height compatibility
Operating Environment: Temperature range –30°C to 65°C
Compliance & Standards: RoHS3 compliance, REACH unaffected status

The SC628D-BTR meets all substitution criteria. While it exhibits a slightly higher current draw range (6–23mA versus 5–18mA) and includes an additional quick-connect tab termination option, it maintains electrical and acoustic equivalence across all core parameters. The marginal increase in current consumption remains within typical system design tolerances for internally driven piezo indicators.

Parameter Comparison

Parameter	SC628D-1R (Main Part)	SC628D-BTR (Substitute)
Manufacturer	Mallory Sonalert Products Inc.	Mallory Sonalert Products Inc.
Product Status	Obsolete	Active
Technology	Piezo	Piezo
Driver Circuitry	Indicator, Internally Driven	Indicator, Internally Driven
Input Type	DC	DC
Voltage Range	6–28V	6–28V
Frequency	2kHz	2kHz
Operating Mode	Single Tone	Single Tone
Sound Pressure Level	60dB @ 6V, 61cm	60dB @ 6V, 61cm
Current Supply	5–18mA	6–23mA
Mounting Type	Panel Mount	Panel Mount
Port Location	Top	Top
Operating Temperature	–30°C to 65°C	–30°C to 65°C
Size / Diameter	42.85mm	42.98mm
Height – Seated (Max)	35.54mm	35.54mm
Termination	Screw Terminals	Screw Terminal, Quick Connect Tab – 0.250" (6.35mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	Not specified	cUL, UL

Engineering Selection Recommendations

The SC628D-BTR is the direct substitute for the obsolete SC628D-1R. Both components are manufactured by Mallory Sonalert Products Inc. and maintain identical electrical performance, acoustic output, and mechanical compatibility within panel mount applications.

The SC628D-BTR carries active product status, ensuring ongoing availability and supply chain continuity. It holds cUL and UL certifications, providing additional regulatory compliance documentation compared to the SC628D-1R. Both parts are ROHS3 compliant and REACH unaffected.

The SC628D-BTR's current draw range (6–23mA) encompasses the SC628D-1R specification (5–18mA), with the upper limit representing a 5mA increase. This marginal difference is typical in component evolution and does not impact system-level power budget calculations for standard indicator circuit designs. The addition of quick-connect tab termination on the SC628D-BTR provides enhanced installation flexibility while maintaining backward compatibility with screw terminal connections.

Diameter tolerance between the two units (42.85mm versus 42.98mm) represents a 0.13mm variation, which is negligible for panel mount applications and does not affect mechanical fit or thermal performance.

Frequently Asked Questions (FAQ)

Q: Can the SC628D-BTR directly replace the SC628D-1R in existing designs?

A: Yes. The SC628D-BTR maintains electrical equivalence across voltage range, frequency, operating mode, and acoustic output. Mechanical compatibility is confirmed through identical height and compatible diameter specifications. Termination compatibility is ensured through screw terminal retention on the SC628D-BTR.

Q: What is the significance of the current draw difference (5–18mA versus 6–23mA)?

A: The SC628D-BTR's current range is slightly higher but overlaps substantially with the SC628D-1R. The 5mA increase at maximum draw reflects typical component manufacturing evolution and does not constitute a functional limitation. System power supplies rated for the SC628D-1R will accommodate the SC628D-BTR without modification.

Q: Does the quick-connect tab on the SC628D-BTR affect compatibility?

A: No. The quick-connect tab is an additional feature that does not interfere with screw terminal operation. Existing wiring harnesses designed for the SC628D-1R will function without modification.

Q: Are there compliance or certification differences between these parts?

A: The SC628D-BTR includes cUL and UL certifications, providing enhanced regulatory documentation. Both parts maintain ROHS3 compliance and REACH unaffected status. The SC628D-BTR's additional certifications represent an improvement in compliance posture.

Q: What is the practical impact of the 0.13mm diameter difference?

A: This variation is within standard mechanical tolerances for panel mount components and does not affect fit, function, or thermal performance in typical applications.

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