- How do I confirm the pinout and common pin orientation when replacing an existing SIP resistor pack with the Bourns 4116R-2-151 16-DIP bussed network?
- The Bourns 4116R-2-151 is a 16-pin DIP bussed array where 15 resistors share one common node. Before replacing a SIP pack, verify which pin is the common buss on your PCB footprint and schematic, then match it to the common pin of the 4116R-2-151 (typically identified by the pin-1 mark and the manufacturer’s pinout). A wrong orientation effectively ties 15 signals together or to an unintended rail through 150 Ω, which can cause bus contention or excessive current.
- Can I use the 4116R-2-151 as pull-ups to 3.3 V or 5 V on a microcontroller bus, and how do I choose whether 150 Ω is too low?
- The 4116R-2-151 can be used as a bussed pull-up/pull-down network, but 150 Ω is often much stronger than typical logic pull resistors. With the 4116R-2-151 to 3.3 V, a pulled-low line sinks about 22 mA (3.3 V / 150 Ω); at 5 V it sinks about 33 mA. Check the I/O’s maximum sink/source current and total package current limits; many MCUs cannot sustain that per pin. If you need gentle biasing (e.g., I²C, reset, strap pins), a higher-ohmic network is usually more suitable than the 4116R-2-151.
- Is the 4116R-2-151 appropriate for LED current limiting, and what are the thermal limits when multiple channels are on?
- The 4116R-2-151 provides 150 Ω per element at 125 mW per resistor. For LED limiting, estimate per-channel power as P = I²R. For example, 20 mA through 150 Ω dissipates 60 mW per element, which can be acceptable for one channel, but turning on many channels simultaneously raises package temperature due to thermal coupling. With the 4116R-2-151, derating is needed in high-ambient or when many resistors dissipate power at once; keep margin below 125 mW per element and consider airflow/board copper to avoid drift and long-term stress.
- Can the 4116R-2-151 be used as series termination for fast digital lines, and what signal-integrity trade-offs should I expect?
- The 4116R-2-151 can be used as a 15-channel series resistor bank, but the bussed topology means one end of every resistor is tied together, which is not compatible with true independent series termination per net. If you need series resistors, each resistor must be in-line with its own signal and not share a common node. The 4116R-2-151 is better suited to pull-ups/pull-downs or common-node resistor functions rather than independent series damping.
- I need 15 identical pull-downs to ground; does the 4116R-2-151 work, and what happens if the common pin trace has noise or ground bounce?
- The 4116R-2-151 works well for 15 identical pull-downs (or pull-ups) because all resistors share a common buss node. The common pin becomes a single-point reference for all 15 lines, so routing and return integrity matter. If the common node is tied to a noisy ground or a rail with bounce, that noise can couple into every biased signal through the 4116R-2-151, shifting logic thresholds or introducing jitter on high-impedance inputs.
- How do I evaluate worst-case bias voltage error using the 4116R-2-151 ±2% tolerance and ±100 ppm/°C tempco in an analog threshold network?
- With the 4116R-2-151, each resistor is ±2% and has ±100 ppm/°C absolute tempco, so bias points can shift with temperature and part-to-part variation. For analog thresholds, compute the divider ratio error including resistor tolerance and temperature range (ΔR/R ≈ tempco × ΔT). Over 100°C swing, ±100 ppm/°C implies about ±1% change in absolute resistance, plus initial tolerance. If ratio accuracy is critical, note that the 4116R-2-151 does not specify tight ratio matching; a matched network series may be more appropriate.
- What are common failure modes if the 4116R-2-151 is used to current-limit external connector lines that might be shorted to 24 V?
- The 4116R-2-151 is a low-power resistor network intended for signal-level use. If a connector pin can be shorted to 24 V, a 150 Ω element would see 160 mA and ~3.8 W (V²/R), far beyond the 125 mW rating, leading to overheating and potential open-circuit failure or carbonization on the PCB. For 24 V fault conditions, use higher resistance, dedicated resistors with suitable pulse/overload ratings, or add protection (PTC, TVS, current limiting) rather than relying on the 4116R-2-151.
- Can the 4116R-2-151 be used for bus-hold or default-state resistors on strap pins, and how do I avoid fighting external drivers?
- The 4116R-2-151 can set default states, but 150 Ω creates a strong bias that can significantly load an external driver or override strap programming resistors. For strap pins that are later driven by a peripheral, a strong network like the 4116R-2-151 can increase static current and slow edges. Confirm the strap input leakage/current requirements and use a higher resistance network if you need a weak default without contention.
- What layout and soldering considerations apply when integrating the through-hole 4116R-2-151 in a mostly-SMD design?
- The 4116R-2-151 is a through-hole 16-DIP (0.300" width). In SMD assemblies, it typically requires selective soldering, wave solder, or hand solder, which affects manufacturing flow and cost. Ensure the footprint matches DIP-16 spacing, keep-out for height, and consider whether a surface-mount resistor network alternative would reduce process steps if the rest of the BOM is reflow-only.
- How do I derate the 4116R-2-151 for continuous industrial operation at elevated ambient temperatures (e.g., 85°C to 105°C)?
- The 4116R-2-151 is rated 125 mW per element, but continuous operation near the upper operating range requires derating based on ambient temperature and airflow/PCB heat spreading. Use power calculations per resistor and consider simultaneous dissipation across multiple elements, since internal heating raises the network temperature above ambient. Keeping per-element dissipation well below 125 mW and avoiding many channels at high dissipation concurrently reduces drift and thermal stress.
- Is the 4116R-2-151 suitable for precision resistor ladder or DAC/ADC reference scaling networks?
- The 4116R-2-151 is a bussed array intended for common-node functions and does not provide specified tight ratio matching for ladder accuracy. For resistor ladders, ratio tolerance and tracking dominate performance; the 4116R-2-151’s ±2% tolerance and lack of ratio matching specification can introduce gain/linearity errors. A matched resistor network or discrete precision resistors are usually more predictable for DAC/ADC scaling than using the 4116R-2-151.
- What should I watch for when migrating from a different Bourns 4100R value to the 4116R-2-151 in the same PCB footprint?
- Within the Bourns 4100R family, the DIP footprint and bussed topology are often consistent, but the resistance value change to 150 Ω in the 4116R-2-151 changes bias currents, input loading, and power dissipation. Recheck every net the network touches for new static current and driver limits, and verify the common pin mapping remains the same across the old part and the 4116R-2-151.
- Can I replace multiple discrete 150 Ω resistors with one 4116R-2-151, and what wiring mistake is most common during consolidation?
- You can consolidate up to 15 resistors if (and only if) your circuit needs a shared common node for all 15 resistors. The most common mistake is assuming the 4116R-2-151 provides 15 independent resistors; it does not. Because one side is commoned internally, replacing independent resistors with the 4116R-2-151 can unintentionally tie multiple signals to the same node, changing circuit function.
- How does the 4116R-2-151 behave under ESD events on external I/O lines compared with using separate resistors near the connector?
- The 4116R-2-151 provides series resistance to a common node only if used in that topology; for ESD, placement and current paths dominate. If the 4116R-2-151 is used as pull-ups/pull-downs, it does not replace the need for TVS diodes and controlled return paths. If an ESD surge couples into the common node trace, the event can propagate to many lines through the shared buss, so routing and protection strategy should account for the 4116R-2-151’s common connection.
- Are there compliance or lifecycle concerns using the RoHS non-compliant 4116R-2-151 in a new design, and what are typical mitigation options?
- The 4116R-2-151 is listed as RoHS non-compliant and REACH affected, which can restrict use in products requiring RoHS compliance or specific substance declarations. A common mitigation is selecting a RoHS-compliant resistor network with the same bussed DIP-16 form factor and equivalent electrical value, then validating pinout and common node orientation against the 4116R-2-151 to avoid assembly and functional mismatches.
- What is a practical method to validate the 4116R-2-151 on incoming inspection to catch wrong value or wrong topology before assembly?
- For the 4116R-2-151, measure resistance between the common pin and several other pins; each should read ~150 Ω. Then measure between two non-common pins; it should read ~300 Ω (two 150 Ω resistors in series through the buss) rather than open-circuit as it would for isolated networks. This quick check confirms both the 150 Ω value and the bussed topology of the 4116R-2-151.
