onsemi NL37WZ06US

Overview

NL37WZ06US from onsemi is a triple inverter IC with open-drain outputs, designed for level-shifting and wired-OR logic applications across 1.65 V to 5.5 V supply rails. It delivers 2.1 ns typical propagation delay at 5 V, supports ±24 mA output drive at 3.0 V, and features IOFF partial power-down protection - commonly used in I²C bus buffering and mixed-voltage interface translation.

For engineers reviewing the NL37WZ06US datasheet, pinout, applications, or equivalent options, key selection criteria include open-drain compatibility with 5.5 V-tolerant inputs, sub-5 ns AC performance across voltage ranges, and US8 package suitability for space-constrained PCB layouts.

Technical Context

The NL37WZ06US implements three independent CMOS inverters with open-drain outputs, enabling wired-logic configurations without internal pull-ups. Its input structure tolerates voltages up to 5.5 V regardless of VCC, supporting mixed-supply domain interfacing.

IOFF circuitry actively disables input/output paths when VCC = 0 V, preventing back-powering and signal contention during partial power-down. Propagation delays are specified across four VCC ranges (1.65–1.95 V, 2.3–2.7 V, 3.0–3.6 V, 4.5–5.5 V), with tPZL/tPLZ asymmetry optimized for fast low-to-high and high-to-low transitions in active mode.

Key Specifications

Pinout & Package

The NL37WZ06US is housed in an 8-pin US8 (Case 493) surface-mount package, measuring 2.1 mm × 2.0 mm × 0.55 mm with 0.5 mm pitch and exposed pad for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple inverter with open-drain applications.

Compared with SN74LVC3G06DCU and 74LVC1G06GW, the NL37WZ06US uniquely combines triple-channel density, 1.65–5.5 V operation, and 5.5 V-tolerant inputs in one US8 package - delivering optimal integration for mixed-voltage bus buffering where space and supply flexibility are critical.

Availability

NL37WZ06US is available at Aetrix Electronics and suitable for I²C bus extension, mixed-voltage logic translation, and hot-swap control applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for NL37WZ06US 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

onsemi (Semiconductor Components Industries, LLC) is a global semiconductor supplier focused on energy-efficient technologies for automotive, industrial, cloud, and IoT applications.

The NL37WZ06US belongs to onsemi's TinyLogic® W-series ultra-high-speed CMOS logic family, engineered specifically for low-voltage, low-power, and mixed-signal interface applications demanding minimal propagation delay and robust voltage-domain interoperability.

FAQ

What is the maximum input voltage the NL37WZ06US can tolerate when VCC = 1.8 V?

The NL37WZ06US supports input voltages up to 5.5 V regardless of VCC level - so at VCC = 1.8 V, VIN may safely reach 5.5 V without damage or latch-up. This overvoltage tolerance is confirmed in the Absolute Maximum Ratings table (VIN = −0.5 V to +6.5 V) and explicitly stated in the Features section as "Inputs/Outputs Overvoltage Tolerant up to 5.5 V." The NL37WZ06US uses dedicated input protection circuitry that isolates the core logic from excessive voltage stress.

Does the NL37WZ06US support true tri-state operation?

No, the NL37WZ06US does not provide active tri-state (high-impedance) control via an enable pin. Its outputs are open-drain only - they either sink current (LOW) or float (HIGH, requiring external pull-up). The "Tri-State Mode" referenced in the Maximum Ratings table applies only to output leakage behavior when the device is inactive, not to user-controllable output disable. The NL37WZ06US achieves bus isolation via IOFF during power-down, not programmable tri-state.

Can the NL37WZ06US drive a 50 Ω transmission line directly?

Yes - at VCC = 3.0 V, the NL37WZ06US sinks up to 24 mA, which corresponds to ~60 mA peak current into a 50 Ω load switched between 0 V and 3 V. Measured tPZL/tPLZ values remain within 4.4–6.0 ns across VCC ranges, confirming signal integrity preservation. Layout best practices (short traces, ground plane, controlled impedance) are still required, but no external buffer is needed for point-to-point 50 Ω routing.

Is the NL37WZ06US pin-compatible with older 74-series open-drain inverters like the 74HC06?

No - the NL37WZ06US uses an 8-pin US8 package with non-standard pinout (e.g., VCC on pin 8, GND on pin 4), whereas legacy 74HC06 variants use 14-pin SOIC or DIP with VCC on pin 14 and GND on pin 7. There is no pin-to-pin or functional drop-in replacement relationship. Migration requires PCB layout revision and verification of timing margins due to differences in propagation delay and drive strength.

What is the thermal resistance (θJA) of the NL37WZ06US in its US8 package?

The datasheet specifies θJA = 250 °C/W for the US8 package under JEDEC JESD51-7 conditions (10 mm × 1 inch, 2 oz copper, no airflow). This value is measured on a standardized test board and reflects worst-case junction-to-ambient performance. For typical applications dissipating <5 mW (calculated from CPD = 11 pF, VCC = 3.3 V, f = 10 MHz), self-heating remains below 1.5 °C - well within the −55 °C to +125 °C operating range of the NL37WZ06US.