Model-level data
Detailed LRF0405C Specifications
Values below are reorganized from the current ERDI marketing specification. Confirm the controlled datasheet revision, connector drawing and acceptance conditions with the quotation.
Basic Ranging Performance
| Model | LRF0405C |
|---|---|
| Specified minimum range | 15 m or less |
| 2.3 m x 2.3 m target range | 4,000 m or more at 30% reflectance and visibility of at least 5 km |
| 0.5 m x 1.7 m human-size target range | 1,200 m or more at 30% reflectance and visibility of at least 5 km |
| Ranging frequency | Single measurement or 1 to 10 Hz |
| Multi-target reporting | Up to 3 targets |
| Ranging accuracy | +/-2 m |
| Reported range resolution | 0.1 m or better |
| Valid measurement rate | 98% or higher under specified test conditions |
| False-alarm rate | 1% or lower under specified test conditions |
Optical Parameters
| Laser wavelength | 1535 +/- 5 nm |
|---|---|
| Laser-safety rating | Class I stated in the module specification; the finished integrated product requires its own safety assessment |
| Pulse energy | 200 microjoules or more |
| Beam divergence | 0.6 mrad or less |
| Transmitter lens diameter | 8 mm |
| Receiver lens diameter | 16 mm |
Electrical and Communication Interface
| Connector model | FWF08002-S06B13W5M |
|---|---|
| Communication interface | UART, 3.3 V TTL level |
| Marketing specification supply entry | DC 3 to 5 V |
| Interface-table supply entry | 4.5 to 16 V |
| Power-control input | POWER_ON; module on above 2.7 V and off below 0.3 V, as stated in the current interface table |
| Standby power | 1 mW or less |
| Average power | 2.5 W or less at 10 Hz |
| Peak power | 7 W or less; the current source references 12 V |
Five-Pin Interface
| Pin 1 | Positive power supply; red conductor |
|---|---|
| Pin 2 | Power ground; black conductor |
| Pin 3 | POWER_ON control; white conductor |
| Pin 4 | UART_TX, 3.3 V TTL; yellow conductor |
| Pin 5 | UART_RX, 3.3 V TTL; green conductor |
Mechanical and Environmental
| Dimensions (L x W x H) | 48 x 30.5 x 21 mm |
|---|---|
| Weight | Current marketing source states 32 +/-1 g maximum; confirm the controlled value |
| Operating temperature | -40 to +70 degrees C |
| Storage temperature | -55 to +75 degrees C |
| Impact resistance | Specified to meet MIL-STD-810G testing; confirm method, severity and acceptance criteria for the order |
| Vibration resistance | Specified to meet MIL-STD-810G testing; confirm method, severity and mounting condition for the order |
Engineering caution: The current marketing specification contains conflicting supply entries: DC 3 to 5 V in the main table, 4.5 to 16 V in the pin table, and a 12 V reference for peak power. Do not energize the module from this web page alone. Use the controlled interface drawing and written order configuration.
How it works
Pulsed Time-of-Flight Ranging
The LRF0405C emits a short 1535 nm optical pulse, collects reflected energy through its receiver aperture and measures the round-trip delay between transmission and an accepted echo.
Achievable field range depends on the complete optical link budget: pulse energy, beam divergence, target area and reflectance, atmospheric transmission, receiver aperture, optical-window loss, detector sensitivity and the signal-processing threshold.
Reporting up to three targets can help a host distinguish accepted return peaks from layered scenes such as foliage before terrain or a vehicle before a building. The host system must define which reported echo is operationally relevant.
Read range claims with their test conditions
- The 4 km figure is tied to a 2.3 m x 2.3 m target, 30% reflectance and visibility of at least 5 km.
- The human-size target figure uses a 0.5 m x 1.7 m target under the same stated reflectance and visibility conditions.
- Dark, oblique, small or partially obscured targets can reduce return-signal strength.
- Fog, rain, dust, heat shimmer and a contaminated optical window can reduce field performance.
- Acceptance testing should reproduce the target, atmosphere, repetition rate and host optics used in the real platform.
How this wavelength compares with common alternatives
| Wavelength family | Engineering strengths | Integration considerations |
|---|---|---|
| 1535/1550 nm | Well suited to eye-safety-oriented compact ranging architectures and compatible with InGaAs-class receivers. | Detector and optical-component cost can be higher than in silicon-based 905 nm systems. The finished product still requires a complete laser-safety assessment. |
| 905 nm | Broad silicon-detector ecosystem, compact components and cost-effective high-volume sensing. | Accessible-emission limits, detector dynamic range and solar-background rejection must be evaluated for the required range and final laser class. |
| 1064 nm | Common in high-energy ranging, designation and compatible electro-optical systems. | It is not an automatic substitute for a 1535 nm eye-safety-oriented module; detector choice, coatings, safety controls and mission architecture differ. |
Wavelength alone does not determine fog performance, field range or laser classification. Select a wavelength from the complete safety, target, atmosphere, detector, optical-window and cost trade space.
Core advantages
Designed for Compact OEM Integration
Each feature is tied to a system-level decision that should be reviewed during host design and validation.
Compact mechanical envelope
The stated 48 x 30.5 x 21 mm outline supports small gimbals, handheld optics and compact EO/IR payloads, subject to connector, cable-bend and thermal-clearance requirements.
Low-mass payload option
The current marketing source identifies an approximately 32 g class module. Confirm the controlled mass and cable contribution before closing the platform weight budget.
Multi-echo scene information
Up to three reported targets can give the host more information in layered scenes. Selection logic should be validated against the intended observation or tracking behavior.
Selectable update behavior
Single measurement and 1 to 10 Hz operation let the host trade update rate against power, thermal load and scene requirements.
Narrow optical architecture
The specified pulse energy, beam divergence and receiver aperture support concentrated transmit energy and compact long-range return collection.
Simple UART host interface
A five-pin UART interface can simplify integration, but the conflicting published supply entries make the controlled connector drawing mandatory before prototype power-up.
Engineering applications
Integration Scenarios for the LRF0405C
The module is intended for OEM integration, so optical, electrical, mechanical and software interfaces must be validated as one system.
UAV gimbals and EO/IR payloads
Use range data for geolocation, observation and sensor cueing. Verify payload mass, regulator transient response, boresight stability, vibration and optical-window transmission before flight qualification.
Vehicle observation systems
Review grounding, cable routing, thermal paths, shock isolation and window contamination for mobile installations exposed to vibration and changing weather.
Handheld and portable optics
Plan battery capacity, control logic, protective optics and accessible-emission evaluation around the selected repetition rate and finished enclosure.
Fixed security and monitoring sensors
Validate target reflectance, visibility, mounting stability, weather sealing and maintenance access under the actual observation geometry.
Review the complete host interface
Share the target definition, optical window, cable length, supply limits, mounting envelope, environment and annual quantity for a model-specific integration review.
Technical FAQ
Questions System Integrators Ask
Does the 4 km specification apply to every target?
No. The stated 4 km figure is associated with a 2.3 m x 2.3 m target, 30% reflectance and visibility of at least 5 km. Smaller, darker, oblique or obscured targets and degraded weather can reduce achievable range.
Is the finished product automatically Class I after integration?
No. The current module specification states Class I, but the accessible emission of the finished product depends on the host window, control logic, service access and failure conditions. The final system requires its own safety assessment.
Which supply voltage should an integrator use?
Do not select a supply from the web page alone. The current source contains conflicting entries: DC 3 to 5 V, 4.5 to 16 V and a 12 V peak-power reference. Obtain the controlled interface drawing and written configuration before energizing the module.
Why can the module report up to three targets?
One transmitted pulse may produce several accepted return peaks from objects at different distances. Multiple reported targets let the host select the echo that matches its operating logic.
What should be included in a technical inquiry?
Provide target size and reflectance, required range, visibility assumptions, update rate, connector and cable requirements, supply limits, available volume and mass, operating temperature, host-window details and expected annual quantity.
Engineering references
- Burns, Christodoulou and Boreman, System Design of a Pulsed Laser Rangefinder, Optical Engineering, 1991
- Ma et al., The Short-Range, High-Accuracy Compact Pulsed Laser Ranging System, Sensors, 2022
- Duthon, Colomb and Bernardin, Light Transmission in Fog, Applied Sciences, 2019
- IEC 60825-1, Safety of laser products - Part 1
References provide general engineering context. Purchase specifications, interface documents and acceptance criteria are controlled by the ERDI document revision supplied with the order.
Technical resources
Download LRF0405C Product Data
Use the current product information for early-stage comparison. Obtain the controlled datasheet, interface protocol and mechanical file before design release or purchase.
Controlled LRF0405C Datasheet
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Request Current PDFMechanical and Interface Package
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Request Engineering FilesStart the engineering review
Discuss Your LRF0405C Integration
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