Microwave Diode and Capacitors - Cobham plc

Silicon Limiter PIN Diode
The ML 4200 Series is a range of oxide passivated silicon mesa diodes designed for limiter applications,
especially those requiring low turn-on.
Use of special silane grown silicon, together with differential etching and gold diffusion techniques, produces
thin base diodes of low series resistance and closely controlled minority carrier lifetime. Combined with low
inductance packaging, these properties allow operation over a broad frequency range up to 18 GHz. Hermetic
sealing and oxide passivation provide rugged reliable diodes capable of withstanding stringent environmental
requirements.
Specifications @ +25°C
Type
Breakdown
Voltage (V)
Capacitance
C JO (pF)
Forward
Resistance
(Ohms)
Thermal
Resistance
(°C/W)
Minority
Carrier
Lifetime (ns)
Typ.
Number Min Typ Min Max Typ Max. Max Max.
Standard
Case Styles
ML4202 15 25 0.30 0.35 0.8 1.0 60 15 30
ML4204 15 25 0.20 0.25 1.0 1.2 70 15 30
ML4206 15 25 0.10 0.15 1.2 1.5 80 10 30
ML4207 50 60 0.30 0.35 0.8 1.0 50 20 30
ML4208 50 60 0.20 0.25 1.0 1.2 60 20 30
ML4209 50 60 0.10 0.15 1.2 1.5 70 15 30
Typical Limiter Performance
Type Number
Peak P IN @
10µs (W) Max
Threshold
(dB)
Typ
Leakage P OUT
(dBm) Typ
CW P IN (W)
Max.
Recovery Time
(ns) Typ
ML4202 200 10 24 3 15
ML4204 150 10 23 2 15
ML4206 100 10 22 2 10
ML4207 400 15 29 4 20
ML4208 300 15 28 3 10
ML4209 200 15 27 3 15
Notes:
1. Breakdown Voltage measured at IR = 10uA.
2. Forward bias resistance at 40 mA measured at 3.3 GHz.
3. Junction capacitance measured at 1 MHz.
4. Minority carrier lifetime at IF = 10 mA and I f = 1.7
I R
5. Threshold is defined as the input power at which as limiter has 1 dB additional insertion loss over its 0
dBm value (1 dB compression).
6. Typical limiter performance at 1.0 GHz.
7. Alternative case styles available on request.
8. Storage / Operating Temperature Range: -65°C to +150°C.
Cobham MAL Ltd trading as Cobham Sensor Systems www.cobham.com/sensorsystems
© Cobham plc, 2010.
Whilst every effort is made to ensure the accuracy of the information contained in this brochure, no responsibility can be accepted for any errors and/or
omissions. Descriptions and specifications of products are subject to change without notice Page 22 of 37