KRYTAR 303B / 303BK 100MHz–40GHz Zero-Bias Schottky Detectors
Manufacturer: KRYTAR, Inc.
Product Type: Zero-Bias Schottky RF Detector
Frequency Range: 100MHz to 40GHzInput Connector: 303B: 2.4mm Male; 303BK: 2.92mm K Male
Output Connector: BNC Female
Output Polarity: Negative; positive-output versions available with P suffix
Description: Broadband coaxial RF detectors that convert microwave input power into a measurable voltage without requiring an external diode-bias supply.
The KRYTAR 303B and 303BK are zero-bias Schottky detectors designed for RF and microwave measurements from 100MHz to 40GHz. They are suitable for detecting continuous-wave, modulated and pulsed RF signals in test equipment, radar systems and monitoring circuits.
Both models provide the same basic electrical performance and use a BNC female output connector. The difference is the RF input interface: the 303B uses a 2.4mm male connector, while the 303BK uses a 2.92mm K male connector.
The zero-bias design does not require an external DC bias supply for the detector diode, simplifying use in laboratory instruments, subsystem assemblies and passive monitoring applications.
Technical Specifications
| Parameter | KRYTAR 303B / 303BK Specification |
|---|---|
| Frequency Range | 100MHz to 40GHz |
| Detector Technology | Zero-bias Schottky diode |
| Frequency Response, to 20GHz | ±0.5dB |
| Frequency Response, to 26.5GHz | ±0.8dB |
| Frequency Response, to 40GHz | ±1.5dB |
| Maximum VSWR, to 20GHz | 1.35:1 |
| Maximum VSWR, to 26.5GHz | 1.50:1 |
| Maximum VSWR, to 40GHz | 2.00:1 |
| Typical Voltage Sensitivity | 0.5mV/µW |
| Maximum RF Input Power | 100mW |
| Output Capacitance | 3pF |
| Standard Output Polarity | Negative |
| Positive Output Option | Add P suffix to the part number |
| Output Connector | BNC Female |
| Package Length | Approximately 1.85 inches |
| Package Diameter | Approximately 0.40 inches |
| Operating Temperature | −54°C to +100°C |
Connector Options
| Model | RF Input Connector | Detected Output Connector |
|---|---|---|
| KRYTAR 303B | 2.4mm Male | BNC Female |
| KRYTAR 303BK | 2.92mm K Male | BNC Female |
Typical Applications
Microwave power detection
RF signal-presence monitoring
Radar performance measurements
Pulsed RF measurements
Signal source leveling
AM noise measurements
Electronic warfare systems
Missile-guidance subsystem testing
5G and mmWave test equipment
Broadband RF laboratory measurements
Built-in test equipment
Alarm and threshold-monitoring circuits
Antenna and transmitter testing
Modulation-envelope measurements
Frequency Response and VSWR
The 303B and 303BK use stepped specifications across their frequency range:
| Frequency Limit | Frequency Response | Maximum VSWR |
|---|---|---|
| Up to 20GHz | ±0.5dB | 1.35:1 |
| Up to 26.5GHz | ±0.8dB | 1.50:1 |
| Up to 40GHz | ±1.5dB | 2.00:1 |
KRYTAR 303B vs 303BK
| Parameter | KRYTAR 303B | KRYTAR 303BK |
|---|---|---|
| Frequency Range | 100MHz–40GHz | 100MHz–40GHz |
| RF Input Connector | 2.4mm Male | 2.92mm K Male |
| Output Connector | BNC Female | BNC Female |
| Output Capacitance | 3pF | 3pF |
| Standard Output Polarity | Negative | Negative |
| Maximum Input Power | 100mW | 100mW |
| Primary Selection Factor | 2.4mm system compatibility | K-interface compatibility |
Related KRYTAR 303 Series Models
| Model | RF Input | Output Connector | Selection Difference |
|---|---|---|---|
| KRYTAR 303A | 2.4mm Male | SMA Female | SMA detected-voltage output |
| KRYTAR 303AK | 2.92mm K Male | SMA Female | K input with SMA output |
| KRYTAR 303B | 2.4mm Male | BNC Female | 2.4mm input with BNC output |
| KRYTAR 303BK | 2.92mm K Male | BNC Female | K input with BNC output |
| KRYTAR 303S | 2.4mm Male | SMC Jack | Compact threaded output |
| KRYTAR 303SK | 2.92mm K Male | SMC Jack | K input with SMC output |
303 Series vs 301 Series
The KRYTAR 303 Series extends to 40GHz, while the 301 Series covers up to 20GHz.
Choose the 303 Series when the application extends beyond 20GHz or requires a single detector for broadband measurements through Ka band. Choose the 301 Series when the operating range remains below 20GHz and 40GHz coverage is unnecessary.
Connector type, output connector, polarity and measurement response should also be checked before substitution.
Stock and Lead Time
KRYTAR 303B and 303BK availability may vary according to connector version, polarity, order quantity and production schedule. Contact DataStorageIC with the complete part number, required quantity and target delivery date to confirm current stock, lead time and pricing.
Datasheets, outline drawings and technical selection support can be provided with the quotation.
