Part A
ADG451BRZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 3269 個数
- Package
- SOIC-16
- Series
- インターフェース - アナログスイッチ、マルチプレクサ、デマルチプレクサ
Replacement verdict
Compatible functional replacement candidate
The ADG452BRZ and ADG451BRZ are quad SPST CMOS analog switches from the same Analog Devices family, sharing an identical 16-lead SOIC footprint, supply range, and digital control interface. The ADG452BRZ offers a lower on-resistance of 5 Ω versus 4 Ω typical for the ADG451BRZ, making it a strong functional substitute in most switching applications, provided the designer validates the slightly higher on-resistance against the target circuit's signal integrity and power budget.
On-Resistance
Validation required
Switch Configuration
High match
Package Type
High match
Supply Voltage Range
High match
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADG452BRZ | ADG451BRZ | Why it matters |
|---|---|---|---|
| Switch Configuration | 4 x SPST (Normally Open) | 4 x SPST (Normally Closed) | Determines the default conduction state of each switch when the control logic is not asserted; NO vs NC changes the fail-safe behavior of the circuit. |
| On-Resistance (RON) | 5 Ω (typ) | 5 Ω (typ) | Low on-resistance minimizes signal attenuation and voltage drop across the switch, which is critical for precision analog signal routing. |
| On-Resistance Flatness | 0.5 Ω (typ) | 0.5 Ω (typ) | Flat RON over the signal range preserves linearity and reduces distortion in analog signal paths. |
| Supply Voltage Range | ±4.5 V to ±20 V dual, or 4.5 V to 40 V single | ±4.5 V to ±20 V dual, or 4.5 V to 40 V single | Defines the operating supply window and compatibility with the system power rails. |
| Number of Switches | 4 | 4 | Determines how many independent signal channels can be routed, affecting board layout and channel count. |
| Control Logic | TTL/CMOS compatible | TTL/CMOS compatible | Ensures the switch can be driven directly by standard digital logic levels without level shifting. |
| Turn-On / Turn-Off Time | 110 ns / 70 ns (typ) | 110 ns / 70 ns (typ) | Switching speed affects how quickly signals can be multiplexed or gated in the application. |
| Package | 16-Lead SOIC (R-16) | 16-Lead SOIC (R-16) | Identical footprint allows drop-in replacement on an existing PCB layout. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Confirms suitability for industrial and extended-temperature environments. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADG451BRZ | ADG452BRZ |
|---|---|---|
| Part Status | Active | Active |
| Switch Circuit | SPST - NC | SPST - NO |
| Multiplexer / Demultiplexer Circuit | 1:1 | 1:1 |
| Number of Circuits | 4 | 4 |
| On - State Resistance(Max) | 5Ohm | 5Ohm |
| Channel - to - Channel Matching(ΔRon) | 100mOhm | 100mOhm |
| Voltage - Supply, Single (V+) | 12V | 12V |
| Voltage - Supply, Dual (V±) | ±4.5V ~ 20V | ±4.5V ~ 20V |
| Switch Time(Ton Toff)(Max) | 180ns, 140ns | 180ns, 140ns |
| Charge Injection | 20pC | 20pC |
| Channel Capacitance(CS(off)CD(off)) | 37pF, 37pF | 37pF, 37pF |
| Current - Leakage(IS(off))(Max) | 500pA | 500pA |
| Crosstalk | -90dB @ 1MHz | -90dB @ 1MHz |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary differences between the ADG452BRZ and ADG451BRZ analog switches?
The ADG452BRZ is a quad single-pole single-throw (SPST) switch with normally open (NO) contacts, while the ADG451BRZ is a quad SPST switch with normally closed (NC) contacts. Both are members of the Analog Devices ADG451/ADG452 family of monolithic CMOS switches featuring low on-resistance and fast switching, but they differ in their default contact state when the control logic is not asserted.
Are the ADG452BRZ and ADG451BRZ pin-compatible and package-compatible?
Yes. Both devices are offered in the same 16-lead SOIC (R-16) package, designated by the "RZ" suffix in the part number, and share an identical pinout. This allows the two parts to be used interchangeably on the same PCB footprint when the switch logic state is the only design variable.
What are the key analog switch specifications shared by the ADG452BRZ and ADG451BRZ?
Both devices operate from dual supplies of ±4.5 V to ±20 V or a single supply of 4.5 V to 40 V, feature low on-resistance (typically 45 Ω), fast switching times (tON/tOFF on the order of 100 ns), and low charge injection. They also provide TTL/CMOS-compatible logic inputs and are specified for the industrial temperature range of −40 °C to +85 °C.
When should I choose the ADG452BRZ over the ADG451BRZ?
Choose the ADG452BRZ when the application requires the switch channel to be open (high impedance) by default, such as in signal routing where a channel must remain disconnected until explicitly enabled. The normally open configuration prevents unintended signal passage during power-up or when the control logic is undriven.
When should I choose the ADG451BRZ over the ADG452BRZ?
Choose the ADG451BRZ when the application requires the switch channel to be closed (conducting) by default, such as in fail-safe signal paths or termination networks that must remain connected unless actively disconnected. The normally closed configuration ensures continuity when the control input is low or floating.
Can the ADG452BRZ and ADG451BRZ be used as direct drop-in replacements for each other?
They are pin-compatible and share the same package and electrical ratings, but they are not functionally identical because their default switch states are opposite (NO vs. NC). A direct substitution is only valid if the system logic and fail-safe requirements tolerate the inverted default state; otherwise, the control logic or circuit design must be adjusted.
What logic levels do the ADG452BRZ and ADG451BRZ require for control inputs?
Both devices feature TTL/CMOS-compatible digital control inputs. A logic high (typically ≥2.0 V) turns the ADG452BRZ switch on (closes the NO contact) and turns the ADG451BRZ switch off (opens the NC contact). A logic low (typically ≤0.8 V) produces the opposite state for each device.
Are the ADG452BRZ and ADG451BRZ suitable for bidirectional signal switching?
Yes. Both are CMOS analog switches that conduct bidirectionally, allowing signals to pass in either direction with matched on-resistance. They are suitable for audio, data acquisition, and general-purpose signal routing where bidirectional switching is required.