Herotek DZR124AA vs DZR185AA vs DZR265AA vs DZR400KA Zero-Bias RF Detector
The Herotek DZR124AA, DZR185AA, DZR265AA and DZR400KA are connectorized zero-bias Schottky diode detectors designed for RF and microwave signal monitoring. All four models operate from 10MHz, but their upper frequency limits extend from 12.4GHz to 40GHz.
The main selection factors are the required operating frequency, RF input connector, frequency flatness and VSWR. The DZR124AA, DZR185AA and DZR265AA use SMA connectors, while the higher-frequency DZR400KA uses a 2.9mm K male input.
Model Comparison
| Parameter | DZR124AA | DZR185AA | DZR265AA | DZR400KA |
| Product Type | Zero-Bias Schottky Detector | Zero-Bias Schottky Detector | Zero-Bias Schottky Detector | Zero-Bias Schottky Detector |
| Frequency Range | 10MHz–12.4GHz | 10MHz–18.5GHz | 10MHz–26.5GHz | 10MHz–40GHz |
| Maximum VSWR | 1.25:1 | 1.25:1 | 1.3:1 to 18.5GHz; 2.0:1 to 26.5GHz | 1.3:1 to 18GHz; 1.8:1 to 40GHz |
| Maximum Flatness | ±0.3dB | ±0.5dB | ±0.5dB to 18.5GHz; ±1.0dB to 26.5GHz | ±0.3dB to 18GHz; ±0.6dB to 26GHz; ±1.0dB to 40GHz |
| Low-Level Sensitivity | 0.5mV/µW | 0.5mV/µW | 0.5mV/µW | 0.4mV/µW |
| RF Input | SMA male | SMA male | SMA male | 2.9mm K male |
| Output | SMA female | SMA female | SMA female | SMA female |
| Standard Polarity | Negative | Negative | Negative | Negative |
| Length | 1.05 inches | 1.05 inches | 1.05 inches | 1.30 inches |
| Diameter | 0.32 inches | 0.32 inches | 0.32 inches | 0.32 inches |
Common Features and Applications
All four models operate without an external bias supply. Herotek identifies precision test equipment, transmitter monitoring, power and signal monitoring, radar systems and laboratory testing as typical applications for its zero-bias detector family.
Standard models provide negative output polarity. A positive-polarity version can be specified by adding the suffix P, such as DZR124AAP or DZR400KAP.
Ordering Information
DataStorageIC supplies Herotek RF and microwave components for international customers. Support is available for:
DZR124AA, DZR185AA, DZR265AA and DZR400KA quotations
Current lead-time and availability confirmation
Positive-output polarity versions
Detector model comparison
Datasheet and technical specification requests
Please provide the required model, quantity, destination country and expected delivery date when requesting a quotation.
Frequently Asked Questions
Do these Herotek detectors require an external bias?
No. The DZR124AA, DZR185AA, DZR265AA and DZR400KA are zero-bias Schottky diode detectors and do not require an external DC bias supply.
What is the main difference between the four models?
The main difference is the upper operating frequency. The models cover up to 12.4GHz, 18.5GHz, 26.5GHz and 40GHz respectively.
Which model should be selected for an 18GHz system?
The DZR185AA is generally the most direct choice for an 18GHz system. It provides coverage to 18.5GHz without requiring the higher-frequency connector used by the DZR400KA.
What is the difference between DZR265AA and DZR400KA?
The DZR265AA operates up to 26.5GHz and uses an SMA male input. The DZR400KA extends operation to 40GHz and uses a 2.9mm K male input.
Are positive-output versions available?
Yes. The standard output polarity is negative. Adding the suffix “P” to the model number specifies positive output polarity.
What is the maximum input power?
Herotek specifies a maximum continuous-wave input power of 200mW for the DZR series.
