Part A
AD8115ASTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5352 Stückzahl
- Package
- LQFP-100
- Series
- Schnittstelle für analoge Schalter für spezielle Zwecke
Replacement verdict
Compatible functional replacement candidate
The AD8115ASTZ and AD8112JSTZ are both high-speed video crosspoint switches from Analog Devices, but they differ in channel count, package, and operating temperature range. The AD8115ASTZ offers a 16×16 matrix in a 100-lead LQFP, while the AD8112JSTZ provides a 16×8 matrix in a 48-lead LQFP. Because the channel count and footprint differ, the AD8112JSTZ is not a direct drop-in replacement for the AD8115ASTZ; however, both share the same high-speed crosspoint switch architecture and similar supply and signal characteristics, making the AD8112JSTZ a viable functional candidate where a smaller 16×8 matrix is acceptable and the board layout can accommodate the different package.
Channel Count
Validation required
Package Type
Not compatible
Supply Voltage
High match
Operating Temperature Range
Validation required
Parts at a glance
Part B
AD8112JSTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5301 Stückzahl
- Package
- LQFP-100
- Series
- Schnittstelle für analoge Schalter für spezielle Zwecke
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 | AD8112JSTZ | Why it matters |
|---|---|---|---|
| Number of Channels | 16 x 16 (crosspoint array) | 16 x 8 (crosspoint array) | Defines the matrix size; a 16x16 device routes more inputs to more outputs than a 16x8 device, so they are not directly substitutable in routing capacity. |
| Package / Mounting | 100-lead LQFP | 80-lead LQFP | Different package footprints and pin counts prevent drop-in board replacement without layout changes. |
| Operating Temperature Range | -40°C to +85°C | 0°C to +70°C | The wider industrial temperature range of the AD8115ASTZ allows use in harsher environments where the commercial-grade AD8112JSTZ may not be rated. |
| Output Configuration | 16 outputs (fully differential capable) | 8 outputs | The number of buffered outputs determines how many destinations can be driven simultaneously, affecting system architecture. |
| Supply Voltage | ±5 V (dual supply) | ±5 V (dual supply) | Both operate from the same dual ±5 V rails, so power supply design is compatible between the two parts. |
| Bandwidth (-3 dB) | ~200 MHz (large signal) | ~150 MHz | Higher bandwidth supports faster signal switching; the AD8115ASTZ offers greater headroom for high-speed video and RF routing. |
| Control Interface | Parallel / serial programmable | Parallel / serial programmable | Both use similar digital control schemes, easing firmware reuse, though register maps differ with matrix size. |
| On-Resistance / Output Impedance | Low, matched (typ. ~5 Ω range) | Low, matched (typ. ~5 Ω range) | Low matched impedance preserves signal integrity; similar values mean comparable insertion loss behavior. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8115ASTZ | AD8112JSTZ |
|---|---|---|
| Part Status | Active | Active |
| Applications | Video | Audio, Video |
| Multiplexer / Demultiplexer Circuit | 16:16 | 16:8 |
| Number of Channels | 1 | 1 |
| Voltage - Supply, Dual (V±) | ±4.5V ~ 5.5V | ±5V ~ 12V |
| -3 dB Bandwidth | 225MHz | 60MHz |
| Features | Buffered | Buffered |
| Operating Temperature | -40°C ~ 85°C (TA) | 0°C ~ 70°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AD8115ASTZ and AD8112JSTZ?
The AD8115ASTZ and AD8112JSTZ are both analog crosspoint switches from Analog Devices, but they differ in configuration and package. The AD8115ASTZ is a 16 × 16 crosspoint switch in a 100-lead LQFP package, while the AD8112JSTZ is a 16 × 8 crosspoint switch in a 100-lead LQFP package. The AD8115 provides a larger switching matrix (16 outputs) compared to the AD8112 (8 outputs).
Are the AD8115ASTZ and AD8112JSTZ pin-compatible?
No. Although both devices are housed in a 100-lead LQFP package, they are not pin-compatible because they have different switch matrix configurations (16 × 16 versus 16 × 8) and therefore different pin functions and internal routing. A direct drop-in replacement is not possible without PCB redesign and validation against the respective datasheets.
What is the switch matrix size of each device?
The AD8115ASTZ is a 16 × 16 crosspoint switch, meaning it can route any of 16 inputs to any of 16 outputs. The AD8112JSTZ is a 16 × 8 crosspoint switch, routing any of 16 inputs to any of 8 outputs. The matrix size difference is the primary functional distinction between the two parts.
Do both devices support the same supply voltage and signal bandwidth?
Both the AD8115 and AD8112 are members of Analog Devices' high-speed crosspoint switch family and operate from dual ±5 V supplies with similar high-speed signal handling characteristics. However, designers must confirm exact supply ranges, bandwidth, and switching specifications against the individual datasheets, as the two parts are separate data sheet entries with their own verified parameter tables.
Can the AD8112JSTZ be used as a replacement for the AD8115ASTZ in an existing design?
Not directly. Because the AD8112JSTZ provides only 8 outputs versus 16 outputs on the AD8115ASTZ, any design requiring 16 outputs cannot be served by the AD8112. Replacement requires verifying output count, pin assignments, control interface, and PCB layout against the target datasheet before substitution.
What package do both devices use?
Both the AD8115ASTZ and AD8112JSTZ are offered in a 100-lead LQFP (low-profile quad flat package). The "STZ" suffix in both part numbers indicates the LQFP package and RoHS-compliant construction per Analog Devices ordering nomenclature. Package similarity does not, however, imply pin or functional interchangeability.
Which device should be selected for a design requiring more output channels?
The AD8115ASTZ should be selected when 16 outputs are required, since it provides a 16 × 16 switching matrix. The AD8112JSTZ, with its 16 × 8 matrix, is appropriate only when 8 outputs are sufficient. Selection should be based on the required output count and confirmed against the manufacturer datasheet for the specific design.