Part A
AD8115ASTZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5352 PCS
- Package
- LQFP-100
- Series
- Interface - Analog Switches - Special Purpose
Replacement verdict
Compatible functional replacement candidate
The AD8115ASTZ and AD8111ASTZ are both members of the Analog Devices AD811x family of high-speed video crosspoint switches, sharing the same supply architecture, control interface, and package footprint. While they differ in switching matrix configuration and channel count, the AD8111ASTZ can serve as a functional replacement candidate for the AD8115ASTZ in designs where the reduced matrix size and channel count are acceptable, subject to validation of the specific signal routing requirements.
Matrix Configuration
Validation required
Channel Count
Validation required
Package Type
High match
Supply Voltage
High match
Parts at a glance
Part B
AD8111ASTZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3802 PCS
- Package
- LQFP-80
- Series
- Interface - Analog Switches - Special Purpose
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8115ASTZ | AD8111ASTZ | Why it matters |
|---|---|---|---|
| Number of Channels | 16 x 16 (crosspoint array) | 8 x 8 (crosspoint array) | Determines the matrix size and how many inputs/outputs can be routed, directly affecting system scalability and board layout. |
| Package / Pin Count | 100-lead LQFP | 80-lead LQFP | Different footprints and pin counts mean the two parts are not drop-in compatible on the same PCB. |
| Supply Voltage Range | ±5 V (dual supply) | ±5 V (dual supply) | Confirms both operate from the same bipolar rails, so power supply design can be shared. |
| -3 dB Bandwidth | 225 MHz | 210 MHz | Bandwidth affects the maximum signal frequency the switch can pass with acceptable attenuation; a small difference may matter in high-speed video/RF routing. |
| Channel-to-Channel Crosstalk | -70 dB (typ at 5 MHz) | -65 dB (typ at 5 MHz) | Crosstalk determines signal isolation between routed channels; lower (more negative) values give cleaner signal integrity in dense matrices. |
| On Resistance (RON) | ~5 Ω (typ) | ~5 Ω (typ) | On resistance affects insertion loss and signal fidelity; matching values support similar analog performance. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature ratings mean both suit the same environmental conditions. |
| Control Interface | Parallel / serial digital control | Parallel / serial digital control | Same control scheme allows reuse of the same microcontroller firmware and logic design. |
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 | AD8115ASTZ | AD8111ASTZ |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| Applications | Video | Video |
| Multiplexer / Demultiplexer Circuit | 16:16 | 16:8 |
| Number of Channels | 1 | 1 |
| Voltage - Supply, Dual (V±) | ±4.5V ~ 5.5V | ±4.5V ~ 5.5V |
| -3 dB Bandwidth | 225MHz | 260MHz |
| Features | Buffered | Buffered |
| 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 AD8115ASTZ and AD8111ASTZ?
Both are Analog Devices video crosspoint switches in 100-lead LQFP (STZ) packages, but they differ in matrix size and configuration. The AD8115 is a 16 × 16 crosspoint switch, while the AD8111 is a 16 × 8 crosspoint switch. The AD8115 provides twice the output channel count of the AD8111, which affects board space, power, and routing requirements.
Are the AD8115ASTZ and AD8111ASTZ pin-compatible?
No. Although both use the same 100-lead LQFP (STZ) package, the AD8115 (16 × 16) and AD8111 (16 × 8) have different internal matrices and pin assignments. They are not drop-in replacements for each other; the PCB layout and control interface must be designed for the specific device.
What is the difference in channel count between the two devices?
The AD8115ASTZ is a 16-input by 16-output crosspoint switch (256 switch points), while the AD8111ASTZ is a 16-input by 8-output crosspoint switch (128 switch points). The AD8115 supports twice as many output channels as the AD8111.
Do both devices support the same control interface?
Yes. Both the AD8115 and AD8111 are controlled via a parallel control interface with a similar register structure, allowing channel switching and output disable functions. However, because the matrix sizes differ, the number of addressable outputs and the register map details differ between the two parts; designers should consult the respective datasheets for exact programming details.
Can the AD8111ASTZ be used as a lower-cost substitute for the AD8115ASTZ?
Only if the design requires no more than 8 output channels. The AD8111 provides 16 × 8 switching versus 16 × 16 for the AD8115, so substituting the AD8111 in an AD8115 socket would leave half of the intended output channels unavailable. Substitution is not direct and requires design validation.
What are the typical applications for these crosspoint switches?
Both devices are intended for high-speed video and signal routing applications, including professional video switching, broadcast routing, medical imaging, and test equipment. The AD8115's larger 16 × 16 matrix suits higher-channel-count routing, while the AD8111's 16 × 8 matrix suits smaller routing systems.
Do both parts share the same package and operating temperature range?
Yes. Both the AD8115ASTZ and AD8111ASTZ are offered in the same 100-lead LQFP package (STZ suffix) and are specified for the industrial temperature range of −40 °C to +85 °C, per Analog Devices documentation. Designers should still verify the exact grade and datasheet revision for their specific orderable part number.