TM
ADVANCED
LINEAR
DEVICES, INC.
®
e
EPAD
A
ALD114835/ALD114935
QUAD/DUAL N-CHANNEL DEPLETION MODE EPAD®
V
= -3.50V
GS(th)
PRECISION MATCHED PAIR MOSFET ARRAY
GENERAL DESCRIPTION
APPLICATIONS
ALD114835/ALD114935 are high precision monolithic quad/dual depletion mode
N-Channel MOSFETs matched at the factory usingALD’s proven EPAD CMOS
technology. These devices are intended for low voltage, small signal applica-
tions. They are excellent functional replacements for normally-closed relay ap-
plications, as they are normally on (conducting) without any power applied, but
could be turned off or modulated when system power supply is turned on. These
MOSFETs have the unique characteristics of, when the gate is grounded, oper-
ating in the resistance mode for low drain voltage levels and in the current
source mode for higher voltage levels and providing a constant drain current.
• Functional replacement of Form B (NC) relay
• Zero power fail safe circuits
• Backup battery circuits
• Power failure detector
• Fail safe signal detector
• Source followers and buffers
• Precision current mirrors
• Precision current sources
• Capacitives probes
• Sensor interfaces
• Charge detectors
• Charge integrators
• Differential amplifier input stage
• High side switches
• Peak detectors
• Sample and Hold
• Alarm systems
• Current multipliers
ALD114835/ALD114935 MOSFETs are designed for exceptional device elec-
trical characteristics matching. As these devices are on the same monolithic
chip, they also exhibit excellent temperature tracking characteristics. They are
versatile as design components for a broad range of analog applications such
as basic building blocks for current sources, differential amplifier input stages,
transmission gates, and multiplexer applications. Besides matched pair electri-
cal characteristics, each individual MOSFET also exhibits well controlled pa-
rameters, enabling the user to depend on tight design limits. Even units from
different batches and different date of manufacture have correspondingly well
matched characteristics.
• Analog switches
• Analog multiplexers
• Voltage comparators
• Level shifters
These depletion mode devices are built for minimum offset voltage and differ-
ential thermal response, and they are designed for switching and amplifying
applications in single 5V to +/-5V systems where low input bias current, low
input capacitance and fast switching speed are desired. These devices exhibit
well controlled turn-off and sub-threshold charactersitics and therefore can be
used in designs that depend on sub-threshold characteristics.
PIN CONFIGURATIONS
ALD114835
TheALD114835/ALD114935 are suitable for use in precision applications which
require very high current gain, beta, such as current mirrors and current sources.
A sample calculation of the DC current gain at a drain current of 3mA and gate
input leakage current of 30pA = 100,000,000. It is recommended that the user,
for most applications, connect the V+ pin to the most positive voltage and the
V- and IC pins to the most negative voltage in the system. All other pins must
have voltages within these voltage limits at all times.
-
-
V
V
1
2
3
4
5
6
7
8
IC*
G
16
15
14
13
12
11
10
9
IC*
G
N2
N1
M 2
M 1
D
V
S
D
S
N2
N1
+
+
V
12
-
-
V
V
34
FEATURES
D
D
N3
N4
M 4
M 3
• Depletion mode (normally ON)
• Precision Gate Threshold Voltages: -3.50V +/- 0.05V
G
N4
G
N3
• Nominal R
V
=0.0V of 540Ω
DS(ON) @ GS
IC*
IC*
-
-
V
V
• Matched MOSFET to MOSFET characteristics
• Tight lot to lot parametric control
• Low input capacitance
SCL, PCL PACKAGES
• V
match (V ) — 20mV
GS(th)
OS
ALD114935
-
• High input impedance — 1012Ω typical
• Positive, zero, and negative V
• DC current gain >108
• Low input and output leakage currents
temperature coefficient
GS(th)
-
V
V
1
2
3
4
8
7
6
5
IC*
IC*
G
G
N1
N2
ORDERING INFORMATION (“L” suffix denotes lead-free (RoHS))
M 1
M 2
D
D
V
N1
N2
Operating Temperature Range*
0°C to +70°C
-
-
S
V
12
0°C to +70°C
16-Pin
SOIC
16-Pin
Plastic Dip
Package
8-Pin
SOIC
Package
8-Pin
Plastic Dip
Package
SAL, PAL PACKAGES
Package
*IC pins are internally connected,
connect to V-
ALD114835SCL ALD114835PCL ALD114935SAL ALD114935PAL
* Contact factory for industrial temp. range or user-specified threshold voltage values
Rev 2.1 ©2012 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286
www.aldinc.com
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