ED555/3DS-BU Terminal Block Equivalent & Substitute Parts

Part Overview

The ED555/3DS-BU is a 3-position wire-to-board terminal block manufactured by On Shore Technology Inc., designed for horizontal PCB mounting with 3.5mm pitch spacing. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications. The ED555/3DS-BU provides screw-terminal connectivity with leaf spring wire guards for secure wire retention in applications requiring 6A current capacity at 150V.

Key Parameters

Parameter	ED555/3DS-BU
Positions Per Level	3
Pitch	0.138" (3.50mm)
Mating Orientation	Horizontal with Board
Current Rating	6 A
Voltage Rating	150 V
Wire Gauge	16-28 AWG
Mounting Type	Through Hole
Wire Termination	Screw - Leaf Spring, Wire Guard
Operating Temperature Range	-40°C ~ 105°C
Housing Material	Polyamide (PA), Nylon
Contact Plating	Brass
Screw Thread	M2
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the ED555/3DS-BU is determined by the following critical parameters that must remain consistent:

Positions and Pitch: 3 positions at 0.138" (3.50mm) spacing ensures PCB footprint compatibility
Mating Orientation: Horizontal with board mounting maintains assembly compatibility
Mounting Type: Through hole configuration preserves mechanical installation method
Wire Termination: Screw-based termination with leaf spring and wire guard ensures functional equivalence
Screw Thread: M2 thread specification maintains tool and torque compatibility

The OSTTE030161 qualifies as a manufacturer-recommended substitute based on these core parameters. While electrical ratings differ (10A vs. 6A current; 125V vs. 150V voltage), the mechanical interface and termination method remain functionally equivalent for applications within the substitute's electrical specifications.

Parameter Comparison

Parameter	ED555/3DS-BU	OSTTE030161	Notes
Manufacturer	On Shore Technology Inc.	On Shore Technology Inc.	Same manufacturer
Positions Per Level	3	3	Identical
Pitch	0.138" (3.50mm)	0.138" (3.50mm)	Identical
Mating Orientation	Horizontal with Board	Horizontal with Board	Identical
Current Rating	6 A	10 A	Substitute rated higher
Voltage Rating	150 V	125 V	Original rated higher
Wire Gauge	16-28 AWG	16-26 AWG	Substitute supports narrower range
Mounting Type	Through Hole	Through Hole	Identical
Wire Termination	Screw - Leaf Spring, Wire Guard	Screw - Leaf Spring, Wire Guard	Identical
Operating Temperature	-40°C ~ 105°C	-30°C ~ 105°C	Original supports lower minimum
Housing Material	Polyamide (PA), Nylon	Thermoplastic	Different material designation
Contact Plating	Brass	Brass - Tin Plated	Substitute includes tin plating
Screw Thread	M2	M2	Identical
Torque - Screw	0.4 Nm (3.5 Lb-In)	0.2 Nm (1.7 Lb-In)	Original requires higher torque
Product Status	Obsolete	Active	Substitute is in active production
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Both compliant

Engineering Selection Recommendations

The OSTTE030161 is the manufacturer-recommended substitute for the obsolete ED555/3DS-BU. Both components maintain identical mechanical interfaces, PCB footprints, and wire termination methods, ensuring direct replacement capability at the assembly level.

Selection of OSTTE030161 is supported by:

Active product status with current manufacturing availability (1021 pcs in stock vs. 776 pcs for obsolete part)
ROHS3 compliance maintained across both parts
Identical screw thread specification (M2) and termination architecture
Same manufacturer ensures design continuity and quality standards

Electrical parameter differences require circuit-level evaluation. The OSTTE030161 supports 10A current capacity (vs. 6A original) and 125V voltage rating (vs. 150V original). Applications operating within the substitute's electrical envelope benefit from higher current headroom. Applications requiring the original 150V rating must confirm that circuit voltage does not exceed 125V maximum.

The OSTTE030161 wire gauge range (16-26 AWG) is narrower than the original (16-28 AWG), excluding 28 AWG wire compatibility. Verify wire gauge requirements before substitution.

Operating temperature minimum differs: OSTTE030161 operates to -30°C (vs. -40°C original). Confirm minimum ambient or storage temperature requirements for your application.

Frequently Asked Questions (FAQ)

Q: Can OSTTE030161 replace ED555/3DS-BU in existing PCB designs without layout changes?

A: Yes. Both components share identical pitch (3.50mm), position count (3), and through-hole mounting configuration. PCB footprints are mechanically compatible.

Q: What electrical parameters limit substitution?

A: The OSTTE030161 is rated for 10A at 125V maximum. The original ED555/3DS-BU is rated for 6A at 150V. Substitution is valid only when circuit voltage does not exceed 125V and current does not exceed 10A. If your application requires 150V operation, the OSTTE030161 is not suitable.

Q: Does wire gauge compatibility affect substitution?

A: The OSTTE030161 accepts 16-26 AWG wire, while the original accepts 16-28 AWG. If your design uses 28 AWG wire, the substitute cannot accommodate it. Verify wire gauge specifications before substitution.

Q: Are both parts RoHS compliant?

A: Yes. Both ED555/3DS-BU and OSTTE030161 are ROHS3 compliant and REACH unaffected.

Q: What is the difference in screw torque specifications?

A: ED555/3DS-BU requires 0.4 Nm (3.5 Lb-In) torque; OSTTE030161 requires 0.2 Nm (1.7 Lb-In). Assembly procedures must use the correct torque value for each part to avoid over-tightening or under-tightening.

Q: Is the OSTTE030161 currently available?

A: Yes. OSTTE030161 is in active production status with 1021 pcs in stock, compared to the obsolete ED555/3DS-BU with limited remaining inventory.

Q: What is the minimum operating temperature difference?

A: ED555/3DS-BU operates to -40°C; OSTTE030161 operates to -30°C minimum. If your application requires operation below -30°C, the substitute is not suitable.

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