DD-L25/45 Series Micro-slot (Micro U-shaped) Photoelectric Sensor

Name: DD-L25/45 Series Micro-slot (Micro U-shaped) Photoelectric Sensor
Brand: DAIDISIKE
SKU: dd-l25-45-series-micro-slot-photoelectric-sensor
Availability: InStock

Micro U-shaped photoelectric sensor with 0.01 mm repeatability and 0.025 mm hysteresis, in 10 compact mounting shapes.

DD-L25/45 Series Micro-slot (Micro U-shaped) Photoelectric Sensor - product photo

🔍 Click to enlarge · 1/12

Technical Specifications

Output type	N = NPN / P = PNP (selectable NO/NC)
Lead type	Pre-wired (cable) type, 1 m
Detection groove (slot width)	5 mm
Protection rating	IP65
Minimum detectable object	2 x 0.8 mm
Hysteresis (differential travel)	0.025 mm or less
Repeatability	0.01 mm or less
Operating voltage	DC5-24V +/-10%
Current consumption	Under 15 mA

Overview

The DD-L25/45 is a micro-slot (U-shaped) photoelectric sensor with a 5 mm detection groove, available in NPN and PNP output with selectable NO/NC operation. It is built for machine designers and integrators who need to detect a small flag or part passing through a narrow gap inside a compact mechanism -- precision stages, small automation modules, and slim mounting locations where a standard-size slot sensor will not fit.

The series delivers repeatability within 0.01 mm and hysteresis of 0.025 mm or less, and reliably detects objects as small as 2 x 0.8 mm through the slot. It is offered in 2 body sizes (25 mm and 45 mm) x 5 mounting shapes (K/L/U/F/R), giving 20 catalog part numbers in total, and carries an IP65 rating. Operating voltage is DC5-24V +/-10% with current consumption under 15 mA, and each unit ships as a pre-wired type with a standard 1 m cable.

Features & Benefits

Repeatability Within 0.01 mm

Switching point stays consistent across repeated in/out passes of the same flag, making the sensor a reliable home-position reference for precision stages and pick-and-place mechanisms without adding position error of its own.

Hysteresis (Differential Travel) of 0.025 mm or Less

The object-in and object-out switching thresholds are close together, giving a clean, low-lag switching edge suitable for detecting micro-displacements.

Ultra-compact Body in 2 Sizes x 5 Mounting Shapes

The 25 mm and 45 mm size series each come in K/L/U/F/R mounting shapes (10 shapes x NPN/PNP = 20 catalog part numbers), letting designers fit a slot sensor inside tight module interiors, stage sides, or slim slots without an external bracket.

NPN and PNP Versions with Selectable NO/NC Operation

Two output-type part numbers (N / P) each support switchable Light-ON/Dark-ON operation, so stocking one NPN and one PNP part number covers all four output-type x logic combinations.

Detects Objects as Small as 2 x 0.8 mm

The sensor reliably picks up miniature flags and small parts passing through the slot, suited to micro-mechanism designs where the interrupting object itself is tiny.

IP65-rated

Dust-tight and protected against water jets per IEC 60529, so the sensor can be used in workstations with dust or splash exposure rather than being limited to clean lab conditions.

Under 15 mA Current Consumption, 1 m Pre-wired Cable as Standard

Low per-unit current draw supports dense multi-point sensor layouts without straining the supply, and each unit ships with a 1 m lead-wire connection as standard.

Applications

Home/Limit Position Sensing on Precision Linear Stages and Electric Slides — Repeatability within 0.01 mm and hysteresis of 0.025 mm or less give a stable, low-drift switching reference, suitable as a home or limit-position switch on precision stages and pick-and-place mechanisms.

Miniature Flag Position Detection Inside Semiconductor and 3C Assembly Equipment — The 2 x 0.8 mm minimum detectable object size and micro-slot body let the sensor pick up small flags and parts inside the limited internal space of semiconductor and 3C assembly equipment.

Position Feedback on Miniature Valves and Actuators — The 5 mm detection groove and compact body suit mounting beside the action arm or cam of a small actuator for in-position feedback.

Mechanism-in-place Detection in Lab Automation and Medical Analyzer Equipment — IP65 protection and current consumption under 15 mA suit long-running automation equipment where the sensor is integrated inside the machine.

Retrofitting Standard-size Slot Sensor Positions with a Smaller Footprint — The 10 mounting shapes across the K/L/U/F/R x 25/45 combinations cover multiple compact mounting interfaces, helping match an existing installation opening during equipment retrofits.

Models & Ordering Information

NPN Output (N)

DD-K25NDD-L25NDD-U25NDD-F25NDD-R25NDD-K45NDD-L45NDD-U45NDD-F45NDD-R45N

5 mounting shapes (K/L/U/F/R) x 2 body sizes (25/45)

PNP Output (P)

DD-K25PDD-L25PDD-U25PDD-F25PDD-R25PDD-K45PDD-L45PDD-U45PDD-F45PDD-R45P

5 mounting shapes (K/L/U/F/R) x 2 body sizes (25/45)

How to Select

Model numbering follows DD-[mounting shape][body size][output type], for example DD-K25N = K shape + 25 size + NPN output.
The detection groove is fixed at 5 mm; if a wider groove (e.g. 13 mm) tolerance is needed, select another slot sensor series (such as DD-303N/DD-403N wide-slot models) instead of this series.
Choose one of the 5 mounting shapes (K/L/U/F/R) to match the existing mounting position or drawing.
Choose between the 25 and 45 body-size series according to available mounting space.
Choose NPN (N) or PNP (P) output to match the input type of the downstream PLC/controller; each output type supports field-selectable NO/NC operation, so no separate part number is needed for logic differences.
Confirm the field supply voltage falls within the DC5-24V +/-10% operating range; current consumption is under 15 mA.
If the application requires 0.01 mm-class repeatability and 0.025 mm-class hysteresis, such as precision home positioning, this series is the model in the slot-sensor line with these precision specifications explicitly stated.

📘 Need the full method? NPN vs PNP Sensor Outputs Explained

When NOT to specify the DD-L25/45 — and what to use instead

The target passing through the slot is larger than the 5 mm detection groove, or needs the extra mechanical tolerance of a wider gap

Why not: The detection groove is fixed at 5 mm; the selection guide itself states that a wider groove (e.g. 13 mm) tolerance calls for a different series.

Use instead: a wider-slot model such as DD-303N/DD-403N for larger objects or parts that flutter within the gap

The object or flag to be detected is smaller than about 2x0.8 mm

Why not: The documented minimum detectable object for this series is 2x0.8 mm; nothing finer is specified as detectable.

Use instead: a fiber-optic sensor for the tightest spaces and smallest targets beyond this series' resolution

The mounting location cannot fit any of the 10 compact K/L/U/F/R x 25/45 mm body shapes, or needs a longer factory cable than 1 m

Why not: The series ships only in the listed 2 body sizes x 5 mounting shapes and as a pre-wired type with a standard 1 m cable; no other body size or cable length is documented.

Use instead: a standard-size slot sensor such as EE-SX67, which offers 1 m/2 m/3 m selectable cable lengths and 8 housing shapes

Specifications we do not publish yet

We only publish a figure once we are confident it is true. The items below are still being validated through further testing and real-world customer feedback, so for now we would rather leave them open than guess. If one of them matters to your design, ask us for the latest validated status.

Response time / response frequency is not stated in the source material
Light source type and wavelength are not stated
Detection groove depth (fork insertion depth) is not stated
MTBF / rated mechanical or electrical lifetime is not stated
Operating and storage temperature range is not stated
Cable gauge/type beyond "1 m standard" and connector option (if any) are not stated
No certification documents are published on the product page; available on request only, specific standards/marks not stated

Frequently Asked Questions

What is the detection groove (slot) width of the DD-L25/45 series?

The detection groove is 5 mm.

What is the minimum object size the DD-L25/45 can reliably detect?

The sensor can detect objects as small as 2 x 0.8 mm.

What is the repeatability and hysteresis of this sensor?

Repeatability is within 0.01 mm and hysteresis (differential travel) is 0.025 mm or less.

What output types and mounting shapes are available?

NPN (N) and PNP (P) outputs are available, each with selectable NO/NC operation. There are 5 mounting shapes (K, L, U, F, R) across 2 body sizes (25 and 45), giving 20 catalog part numbers in total.

What is the operating voltage and current consumption?

The rated operating voltage is DC5-24V +/-10%, and current consumption is under 15 mA.

What is the IP rating of the DD-L25/45 series?

IP65 (dust-tight and protected against water jets, per IEC 60529).

Does the sensor come with a connector or a pre-wired cable?

It is a pre-wired (lead-wire) type with a standard 1 m cable.

Can DAIDISIKE provide certification documents for the DD-L25/45 series?

Certification documents are available on request.

Works Well Together

On the same machine or line, DD-L25/45 is typically ordered together with: Photoelectric Sensors · Fiber Optic Sensors · Proximity Sensors

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