Nexperia USA Inc. CBT3125DB,118

Overview

CBT3125DB,118 from Nexperia is a quadruple FET bus switch with independent 14-pin SSOP package, 5 Ω typical ON-resistance at 4.5 V, TTL-compatible inputs, and active-low enable control per channel. It isolates or connects four bidirectional data paths in high-speed digital systems such as memory address/data buses and peripheral interfaces.

For engineers reviewing the CBT3125DB,118 datasheet, CBT3125DB,118 pinout, CBT3125DB,118 application, or CBT3125DB,118 equivalent, key selection criteria include ON-resistance matching, enable timing (t_en ≤ 5.4 ns), off-state capacitance (C_io(off) = 3.4 pF), latch-up immunity (>500 mA), and SSOP14 footprint compatibility.

Technical Context

The CBT3125DB implements four independent transmission-gate-style FET switches using NMOS pass transistors with integrated level-shifting circuitry to ensure TTL-compatible input thresholds and rail-to-rail signal pass-through. Each channel features separate active-low output enable (nOE) control, enabling selective bus segmentation without propagation delay stacking.

Its static characteristics are specified over −40 °C to +85 °C with V_CC = 4.5–5.5 V; dynamic performance includes sub-0.25 ns propagation delay (t_pd) and <2.5 ns enable/disable transitions under 50 pF load, supporting >10 MHz bus switching in low-voltage logic domains.

Key Specifications

Pinout & Package

CBT3125DB,118 uses the SOT337-1 (SSOP14) package: plastic shrink small outline, 14 leads, 5.3 mm body width, 0.65 mm lead pitch, and exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FET bus switch applications.

Compared with SN74CBT1125CPW, CBT3125DB,118 saves board space via SSOP14 and matches timing specs; versus 74LVC1G125GW, it delivers lower R_ON, guaranteed 5 V operation, and integrated quad functionality-reducing component count and interconnect inferences.

Availability

CBT3125DB,118 is available at Aetrix Electronics and suitable for memory bus isolation, peripheral multiplexing, hot-swap interfaces, and logic-level bridging requiring stable component supply and SSOP14 footprint consistency.

Supply support for CBT3125DB,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET solutions with focus on efficiency, miniaturization, and robustness for industrial and consumer electronics.

The CBT3125 series belongs to Nexperia's high-speed logic bus switch product line, engineered specifically for low-latency, low-distortion bidirectional signal routing in 5 V digital systems with stringent timing and noise requirements.

FAQ

What is the maximum operating voltage for CBT3125DB,118?

The absolute maximum supply voltage is +7.0 V, but the recommended operating range is strictly 4.5 V to 5.5 V per Table 5. Operation outside this range risks exceeding static characteristic limits, degrading R_ON stability and increasing leakage current beyond ±1 μA. Continuous use above 5.5 V voids parametric guarantees and may accelerate wear-out.

Can unused nOE pins be left floating?

No. All unused nOE inputs must be tied to either V_CC or GND to prevent indeterminate switching states, as stated in Note [1] of Table 5. Floating nOE pins cause unpredictable channel enablement, leading to bus contention or unintended signal leakage. A pull-up resistor to V_CC (e.g., 10 kΩ) is preferred for default-disabled operation.

Does CBT3125DB,118 support bidirectional signal flow with unequal voltage domains?

No. The device is not a level translator; it passes signals only within the V_CC domain. Both nA and nB sides must remain within −0.5 V to V_CC +0.5 V (Table 4). Applying 3.3 V to nA while V_CC = 5 V is acceptable, but applying 5 V to nA while V_CC = 3.3 V violates VI limit and risks damage.

How does the 5 Ω ON-resistance affect signal integrity at 50 MHz?

At 50 MHz, the 5 Ω R_ON interacts with typical PCB trace impedance (~50 Ω) to form a 10:1 voltage divider, causing <10% amplitude loss - negligible for TTL logic thresholds. Combined with 3.4 pF off-capacitance and sub-0.25 ns t_pd, it maintains rise/fall time degradation below 5% for 100 ps edges, verified under 50 pF load per Table 9.