Renesas HZU9.1B3JTRF

Overview

HZU9.1B3JTRF from Renesas Electronics is a silicon epitaxial planar Zener diode optimized for hard-knee, low-noise voltage reference applications, with nominal Zener voltage 9.1 V, dynamic resistance 500 Ω at IZT = 5 mA, and ultra-small URP (SC-76A) surface-mount package. It delivers stable regulation in precision analog circuits requiring minimal noise and tight temperature coefficient.

For engineers reviewing the HZU9.1B3JTRF datasheet, HZU9.1B3JTRF pinout, HZU9.1B3JTRF application, or HZU9.1B3JTRF equivalent, key selection criteria include its 9.1 V ±5% Zener tolerance, −0.04 %/°C temperature coefficient, 150 mW power dissipation, and suitability for low-current reference designs where noise suppression and knee sharpness are critical.

Technical Context

HZU9.1B3JTRF operates as a two-terminal voltage reference device with semi-logarithmic linear V_Z–I_Z characteristics over 1 nA to 1 mA. Its hard-knee Zener behavior enables precise turn-on without soft roll-off, supporting accurate threshold detection and biasing in analog front-ends.

The diode exhibits low noise voltage-approximately one-third to one-tenth that of standard HZU-series parts-and a temperature coefficient roughly half that of the legacy HZU series, directly improving long-term stability in unregulated supply rails and sensor signal conditioning paths.

Key Specifications

Pinout & Package

Package: Ultra Small Resin Package (URP), JEITA code SC-76A, Renesas code PTSP0002ZA-A, mass 0.004 g. Dimensions: A1 = 0.15–0.45 mm, A2 = 0.75–1.05 mm, b = 1.55–1.85 mm, D = 0.80 mm, E = 2.30–2.50 mm, e1 = 1.10–1.40 mm, l1 = 0.80 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener reference applications.

Compared with BZX84-C9V1 and MMSZ5240B, HZU9.1B3JTRF provides uniquely low noise, hard-knee regulation, and the lowest temperature coefficient in its voltage class-making it the preferred choice for metrology-grade references and high-stability sensor interfaces where 9.1 V is specified.

Availability

HZU9.1B3JTRF is available at Aetrix Electronics and suitable for high-precision ADC reference, low-noise sensor biasing, and industrial current loop sender applications requiring stable component supply, full traceability, and guaranteed long-term availability.

Supply support for HZU9.1B3JTRF 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

Renesas Electronics Corporation is a global semiconductor manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.

HZU9.1B3JTRF belongs to the HZU-LL Series, designed specifically for low-noise, hard-knee voltage reference applications in precision analog signal chains where traditional Zener diodes exhibit excessive drift or noise.

FAQ

What is the Zener voltage tolerance for HZU9.1B3JTRF?

HZU9.1B3JTRF has a Zener voltage tolerance of ±5% at I_ZT = 5 mA, meaning its actual V_Z falls between 8.65 V and 9.55 V under standard test conditions. This tolerance is confirmed in the Electrical Characteristics table of the REJ03G1216-0500 datasheet. The HZU9.1B3JTRF achieves this spec using laser-trimmed epitaxial planar construction, ensuring consistency across production lots.

Does HZU9.1B3JTRF support operation at elevated ambient temperatures?

Yes, HZU9.1B3JTRF is rated for storage from −55°C to +150°C and junction temperature up to 150°C. Its derated power dissipation follows the curve in Figure 3 of the datasheet: at 75°C ambient, P_d drops to ~100 mW. For continuous operation at 85°C ambient, ensure board-level thermal design limits junction temperature below 150°C. The HZU9.1B3JTRF's low temperature coefficient helps maintain regulation accuracy under these conditions.

What does "hard knee" mean for HZU9.1B3JTRF?

"Hard knee" describes HZU9.1B3JTRF's sharply defined Zener breakdown transition, visible as near-linear V_Z–I_Z behavior from 1 nA to 1 mA (per datasheet Figure 1). Unlike soft-knee diodes, it avoids gradual turn-on, delivering predictable, repeatable regulation onset. This trait makes HZU9.1B3JTRF ideal for threshold detection and precision biasing where ambiguity in conduction start must be eliminated.

Is HZU9.1B3JTRF RoHS compliant?

Yes, HZU9.1B3JTRF complies with the EU RoHS Directive, as confirmed by Renesas Electronics' environmental compliance documentation. The URP package uses lead-free solderable terminations and halogen-free molding compound. Full material declarations and substance reports for HZU9.1B3JTRF are available through Renesas' official portal and Aetrix Electronics' quality documentation system.

Can HZU9.1B3JTRF replace standard HZU-series Zeners in existing designs?

HZU9.1B3JTRF is a direct drop-in replacement for HZU9.1B variants in the legacy HZU series, sharing identical URP package, pinout, and mechanical dimensions. However, its lower noise and reduced temperature coefficient may improve performance without layout changes. Verify that the 9.1 V ±5% tolerance and 500 Ω dynamic resistance meet your circuit's regulation margin-no requalification is needed for most analog reference roles. The HZU9.1B3JTRF datasheet explicitly positions it as the low-noise evolution of the HZU family.