Nexperia USA Inc. TLVH431NIDBZRR

Overview

TLVH431NIDBZR from Nexperia is an adjustable precision shunt regulator in SOT23 package, configured with normal pinning (REF–K–A), offering 1.24 V reference voltage with ±1.5 % tolerance over –40 °C to +85 °C, 0.1 Ω dynamic cathode-anode impedance, and 0.08–70 mA sink current range. It functions as a programmable voltage reference or shunt element in feedback loops of isolated DC-DC converters.

For engineers reviewing the TLVH431NIDBZR datasheet, TLVH431NIDBZR pinout, TLVH431NIDBZR application, or TLVH431NIDBZR equivalent, key selection criteria include reference accuracy across temperature, low output impedance for stable regulation, cathode current capability under varying load conditions, and compatibility with standard SOT23 PCB footprints and reflow profiles.

Technical Context

The TLVH431NIDBZR implements a bandgap-based reference core with active error amplifier and NPN output stage, enabling sharp turn-on characteristics and precise voltage regulation via external resistor divider. Its functional diagram confirms REF input controls internal comparator, while cathode (K) sinks current proportional to deviation from Vref.

It operates as a 3-terminal shunt device: anode (A) connects to ground or return path, cathode (K) sinks current into the regulated node, and REF sets threshold via resistive divider. Output voltage is programmable from 1.24 V to 14 V using two external resistors, with minimal reference current (≤0.3 μA) reducing divider power loss.

Key Specifications

Pinout & Package

SOT23 plastic surface-mounted package (3 leads), 1.9 mm × 1.1 mm × 0.9 mm body, standard footprint per Figure 30 (reflow soldering).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable shunt regulator applications.

Compared with TLVH431ACDBZR, TLVH431NIDBZR trades 0.5 % reference accuracy for lower cost and same industrial temperature support; versus TL431CDBZR, it offers lower Vref and tighter tolerance but reduced max cathode current and no pin compatibility.

Availability

TLVH431NIDBZR is available at Aetrix Electronics and suitable for isolated SMPS feedback, precision current limiting, and on-board voltage regulation requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for TLVH431NIDBZR 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 focused on high-volume, high-reliability logic, discrete, and power MOSFET solutions, headquartered in Nijmegen, Netherlands.

The TLVH431N family belongs to Nexperia's precision analog portfolio, designed specifically for cost-sensitive industrial and consumer power management applications requiring stable, adjustable shunt regulation without automotive qualification overhead.

FAQ

What is the minimum cathode current required to maintain regulation?

The TLVH431NIDBZR requires a minimum cathode current (IK(min)) of 55 μA to sustain regulation, as specified in Table 10. This value is measured at VKA = Vref and applies across its full operating temperature range (–40 °C to +85 °C). Designers must ensure the external resistor network delivers at least this current under worst-case conditions, including lowest input voltage and highest temperature.

Can TLVH431NIDBZR replace a Zener diode in a 5 V shunt regulator?

Yes - TLVH431NIDBZR can directly replace Zener diodes in 5 V shunt applications using a two-resistor divider (R1 from cathode to 5 V output, R2 from REF to ground). With Vref = 1.24 V, R1/R2 ratio ≈ 3.03 achieves 5 V output. Its 0.1 Ω impedance and sharp turn-on provide superior regulation accuracy and temperature stability compared to typical 5 V Zeners.

Does TLVH431NIDBZR support operation above 85 °C ambient?

No - TLVH431NIDBZR is rated for –40 °C to +85 °C ambient operation (industrial grade). The 'I' suffix denotes this temperature range, distinct from 'Q' (automotive) or 'M' (–40 °C to +125 °C) variants. Exceeding +85 °C ambient risks parametric shift beyond specification limits and violates recommended operating conditions in Table 8.

How does the mirrored pinning variant differ from TLVH431NIDBZR?

TLVH431NIDBZR uses normal pinning (Pin 1 = REF, Pin 2 = K, Pin 3 = A), whereas mirrored variants (e.g., TLVH431NMQDBZR) swap REF and K (Pin 1 = K, Pin 2 = REF, Pin 3 = A). This affects PCB layout and cannot be interchanged without board revision. The 'I' in TLVH431NIDBZR explicitly confirms normal pinning per Table 1 and Table 3.