# ILX Lightwave LDT-5525 Thermoelectric Temperature Controller (Pre-Owned)

# ILX Lightwave LDT-5525 Thermoelectric Temperature Controller (Pre-Owned)

## Key Features At A Glance

-   Bipolar current output up to 4 A with 24 W maximum output power for driving thermoelectric modules
-   Temperature control range of -99.9°C to 199.9°C with 0.1°C setpoint resolution
-   Short-term temperature stability better than ±0.004°C (one-hour, half-scale into LDM-4412 mount)
-   Three operating modes: constant temperature, constant sensor resistance, and constant current
-   Compatible with NTC thermistors, AD590 and LM335 IC sensors, and Platinum RTDs (via optional TSC-599 converter)
-   User-selectable thermistor sensing currents of 10 µA and 100 µA covering 25 Ω to 450 kΩ range
-   Smart Integrator hybrid PI control algorithm with adjustable front-panel gain for slew rate and settling time optimization
-   Independent current limit (0–4.0 A) and temperature limit settings for device protection

The ILX Lightwave LDT-5525 is a precision thermoelectric temperature controller optimized for temperature control of laser diodes and photodetectors. It delivers up to 4 A of bipolar output current to a TE module with up to 24 W of output power, and provides direct temperature readout from thermistors and IC temperature sensors. The instrument uses an advanced hybrid smart-integrator control algorithm to maintain temperature stability typically within ±0.004°C, and can be operated in constant temperature, constant sensor resistance, or constant current mode.

According to the datasheet, the LDT-5525 is designed for temperature control of laser diodes and photodetectors, including laser diode applications requiring highly stable wavelength and optical power. The instrument is well suited to driving a TE module against a thermal load such as an ILX Lightwave LDM-4412 laser diode mount, where its bipolar output and limit-protected control loop hold the device at a stable setpoint. A temperature controller of this class provides the closed-loop thermal regulation that keeps an optoelectronic device's operating point fixed once the test setup is in place.

ValueTronics stocks and tests this controller in our 20,000 sq ft secure facility at 1675 Cambridge Drive, Elgin, Illinois. Each pre-owned LDT-5525 passes through our in-house inspection and performance verification before it ships, which is the workflow that lets us stand behind the unit with documented condition rather than a third-party listing description. That accountability — owning the warehouse, the testing bench, and the support phone line under one roof — is the distinction between buying from ValueTronics and buying from a drop-shipper or pass-through broker.

## Accessories Supplied

-   One TS-510 10kΩ Calibrated Thermistor (±0.2°C)

## Product Core & Specifications

Temperature Control

Temperature Control Range

\-99.9°C to 199.9°C

Thermistor Setpoint Resolution

0.1°C

Thermistor Setpoint Accuracy

±0.2°C

AD590 and LM335 Setpoint Resolution

0.1°C

AD590 and LM335 Setpoint Accuracy

±0.2°C

Short-Term Stability (one-hour)

<±0.004°C

Long-Term Stability (24-hours)

<±0.01°C

TEC Output

Output Type

Bipolar current source

Control Algorithm

Smart Integrator, Hybrid PI

Compliance Voltage

6V (at 4A)

Maximum Output Current

4.0A

Maximum Output Power

24W

Ripple/Noise

<1mA, rms

Current Limit

Range

0-4.0A

Accuracy

±50mA

Temperature Sensor

Thermistor Type

NTC (2-wire)

IC Sensors

AD590/LM335

RTD Sensor

With use of optional TSC-599 Temperature Sensor Converter

Thermistor Sensing Current

10/100µA

IC Sensor Bias

AD590=8V, LM335=0.6mA

Usable Thermistor Range

25-450,000Ω, typical

User Calibration - IC Sensors

Two point

User Calibration - Thermistor

Steinhart-Hart (2 constants)

TEC Measurement (Display)

Display Type

4-digit green LED

Temperature Range

\-99.9°C to 199.9°C

Temperature Resolution

0.1°C

Temperature Accuracy

±0.2°C, typical

Thermistor Resistance Range (10µA Setting)

0.0-450.0kΩ

Thermistor Resistance Range (100µA Setting)

0.0-45.00kΩ

Thermistor Resistance Resolution (10µA Setting)

0.1kΩ

Thermistor Resistance Resolution (100µA Setting)

0.01kΩ

Thermistor Resistance Accuracy (10µA Setting)

±0.05% of FS

Thermistor Resistance Accuracy (100µA Setting)

±0.05% of FS

TE Current Range

\-4.00 to 4.00A

TE Current Resolution

0.01A

TE Current Accuracy

±0.03A

General

Power, VAC (50-60Hz)

95-125, 210-250, selectable

Size (HxWxD)

88mm x 185mm x 304mm (3.5" x 7.3" x 12")

Weight

3.6kg (8lbs)

Operating Temperature

0°C-40°C

Storage Temperature

\-40°C to 70°C

Humidity

<85% relative, noncondensing

**Important:** Stability and accuracy figures are referenced to specific conditions: half-scale output controlling an LDM-4412 mount at 25°C with a 10 kΩ thermistor on the 100 µA setting. Actual temperature control range depends primarily on the thermal load, sensor, and TE module used.**Important:** Output current and power rated into a 1Ω load.**Important:** Actual temperature control range depends primarily on the thermal load, sensor, and TE module used.**Important:** Accuracy figures quoted are for a typical 10kΩ thermistor and 100µA setting. Accuracy figures are relative to the calibration standard. Both resolution and accuracy are dependent on the user-defined configuration of the instrument.**Important:** 6V compliance guaranteed. Compliance voltage up to 8V (32W) is typical. Higher output powers can also be accommodated with the use of an external booster. Contact ILX Lightwave for further information.**Important:** RTD sensor support requires the optional TSC-599 Temperature Sensor Converter (sold separately).Recommended pairing: the CC-505S TE Controller/Laser Diode Mount Interconnect Cable connects the LDT-5525 to an ILX Lightwave laser diode mount, and the included TS-510 calibrated 10 kΩ thermistor (±0.2°C) provides the matching sensor for closed-loop temperature control.

## About this used unit

-   Warranty included
-   Functional verification included
-   Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data.
-   Note that unnecessary accessories may not be included (contact Test Architect to confirm).

**Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.**

## Details

- **Price:** 0.0 USD - 315.0 USD
- **Vendor:** ILX Lightwave
- **Type:** Temp Cont
- **Tags:** Fiber Optic, ILX Lightwave, Manufacturers, Other Equipment, product_manual_group_1, Product_used

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| None | 0.00 USD | In stock |
| NIST Traceable | 140.00 USD | In stock |
| NIST Traceable with Full Data | 245.00 USD | In stock |
| ISO IEC 17025 Accredited | 315.00 USD | In stock |

## Images

- ILX Lightwave LDT-5525 Thermoelectric Temperature Controller (Pre-Owned)

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> Source: [ValueTronics](https://valuetronics.com/products/ldt-5525-ilx-lightwave-fiber-optic-equipment-used)
> Updated: 2026-05-30