Part A
ADG788BCPZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7139 PCS
- Package
- WFQFN-20
- Series
- Interfaces - commutateurs analogiques, multiplexeurs, démultiplexeurs
Replacement verdict
Compatible functional replacement candidate
The ADG788BCPZ and ADG781BCP are both quad SPST CMOS analog switches from Analog Devices in a 20-lead LFCSP package, sharing the same switch configuration, supply range, and logic interface. The ADG788BCPZ offers a lower on-resistance and faster switching, making it a viable functional replacement candidate for the ADG781BCP in most signal-switching applications, provided the designer validates the on-resistance and timing margins against the target circuit requirements.
Switch Configuration
High match
Package Type
High match
On-Resistance
Validation required
Switching Time
Validation required
Parts at a glance
Part B
ADG781BCP
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4724 PCS
- Package
- WFQFN-20
- Series
- Interfaces - commutateurs analogiques, multiplexeurs, démultiplexeurs
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADG788BCPZ | ADG781BCP | Why it matters |
|---|---|---|---|
| Number of Switches | 4 (quad SPDT) | 2 (dual SPDT) | Determines how many independent signal paths can be routed; a direct functional substitutability blocker if the design needs four switches. |
| Switch Configuration | SPDT (2:1 mux per channel) | SPDT (2:1 mux per channel) | Both are SPDT, so per-channel routing topology matches, but the channel count differs. |
| On-Resistance (R_ON) | ~2.5 Ω (typical at 5 V) | ~2.5 Ω (typical at 5 V) | Low on-resistance minimizes signal attenuation and voltage drop; similar values support comparable analog signal integrity. |
| Supply Voltage Range | 1.8 V to 5.5 V single supply | 1.8 V to 5.5 V single supply | Must match the system rail; identical ranges allow operation in the same low-voltage designs. |
| Package | 20-lead LFCSP (4x4 mm) | 20-lead LFCSP (4x4 mm) | Footprint and pinout compatibility are essential for drop-in replacement on an existing PCB. |
| Control Logic Interface | CMOS/TTL compatible | CMOS/TTL compatible | Ensures the switch can be driven directly by standard digital logic levels in the host system. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Confirms both parts meet the same industrial temperature requirements for the target application. |
| Channel-to-Channel Crosstalk | Low crosstalk (datasheet specified) | Low crosstalk (datasheet specified) | Affects signal isolation between channels; comparable performance preserves analog signal fidelity. |
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 | ADG788BCPZ | ADG781BCP |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Mounting Type | Surface Mount | Surface Mount |
| Switch Circuit | SPDT | - |
| Multiplexer / Demultiplexer Circuit | 2:1 | - |
| Number of Circuits | 4 | - |
| On - State Resistance(Max) | 4.5Ohm | - |
| Voltage - Supply, Single (V+) | 1.8V ~ 5.5V | - |
| Voltage - Supply, Dual (V±) | ±2.5V | - |
| Switch Time(Ton Toff)(Max) | 21ns, 10ns (Typ) | - |
| -3 dB Bandwidth | 160MHz | - |
| Charge Injection | 5pC | - |
| Channel Capacitance(CS(off)CD(off)) | 11pF | - |
| Current - Leakage(IS(off))(Max) | 100pA | - |
| Crosstalk | -80dB @ 1MHz | - |
| Operating Temperature | -40°C ~ 85°C (TA) | - |
Frequently asked questions
What are the key differences between the ADG788BCPZ and the ADG781BCP?
The ADG788BCPZ is a dual SPDT switch in a 20-lead LFCSP package, while the ADG781BCP is a quad SPST switch in a 20-lead LFCSP. The ADG788 offers two independently controlled changeover switches, whereas the ADG781 provides four independently controlled on/off switches. Both are CMOS analog switches with similar on-resistance and supply voltage ranges, but their switch configurations and channel counts differ.
Are the ADG788BCPZ and ADG781BCP pin-compatible?
No. Although both devices are offered in a 20-lead LFCSP package, their pin functions and internal switch configurations differ. The ADG788BCPZ uses a dual SPDT arrangement, while the ADG781BCP uses a quad SPST arrangement. Pin assignments and control logic are not interchangeable, so they cannot be treated as pin-compatible substitutes.
What supply voltage range do the ADG788BCPZ and ADG781BCP support?
Both devices operate from a dual supply of ±2.5 V to ±5.5 V or a single supply of 2.5 V to 5.5 V, consistent with the ADG78x family specifications. Designers should confirm the exact limits in the respective manufacturer datasheets for the target operating conditions.
What is the on-resistance of the ADG788BCPZ and ADG781BCP?
Both the ADG788BCPZ and ADG781BCP feature low on-resistance in the range of a few ohms, typical of the ADG78x family. The exact on-resistance value depends on supply voltage and signal level, so the manufacturer datasheet should be consulted for the specific guaranteed limits at the intended operating conditions.
Can the ADG788BCPZ and ADG781BCP be used in multiplexer or signal routing applications?
Yes. The ADG788BCPZ, with its dual SPDT configuration, is suited to signal routing and changeover applications, while the ADG781BCP, with four independent SPST switches, is suited to signal gating and multiplexing where individual channel control is required. Both are CMOS analog switches intended for audio, data acquisition, and general signal switching.
Do the ADG788BCPZ and ADG781BCP have the same control logic interface?
No. The ADG788BCPZ uses control inputs to select between the two throw positions of each SPDT switch, while the ADG781BCP uses independent logic inputs to turn each SPST switch on or off. The number of control lines and their logic function differ, so the control interface is not identical between the two devices.
What package type do the ADG788BCPZ and ADG781BCP use?
Both the ADG788BCPZ and ADG781BCP are supplied in a 20-lead LFCSP (lead frame chip scale package). The "CPZ" and "CP" suffixes in the part numbers denote the LFCSP package option. Designers should verify the exact package outline and thermal characteristics in the manufacturer datasheet before layout.