Renesas HZS5BLL-JTA

Overview

HZS5BLL-JTA from ROHM Semiconductor is a silicon epitaxial planar Zener diode designed for precision voltage regulation in stabilized power supplies, with a nominal zener voltage of 4.6–4.8 V (Grade B1), 400 mW power dissipation, 1.5 V reverse test voltage, and dynamic resistance ≤100 Ω at 5 mA - deployed in industrial DC-DC reference stages and low-power sensor bias networks.

For engineers reviewing the HZS5BLL-JTA datasheet, HZS5BLL-JTA pinout, HZS5BLL-JTA application, or HZS5BLL-JTA equivalent, key selection criteria include verified zener voltage tolerance (±0.2 V), low leakage (<5 µA at VR = 1.5 V), thermal stability (TC ≈ −2.5 mV/°C near 4.7 V), and compatibility with 5 mm-pitch automated insertion equipment.

Technical Context

This discrete Zener diode operates in reverse breakdown mode with DC-tested characteristics; its epitaxial planar structure ensures low noise, stable knee voltage, and reproducible zener impedance across production lots.

It is rated for junction temperatures up to 200°C and storage from −55°C to +175°C, supporting use in thermally demanding environments where passive voltage references must maintain regulation without active compensation.

Key Specifications

Pinout & Package

DO-35 glass axial package with cathode band marking; leads are tinned copper alloy, 0.45–0.55 mm diameter, 25 mm minimum length.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode voltage regulation applications.

Compared with 1N4733A and BZX55-C4V7, HZS5BLL-JTA offers tighter V_Z grade (B1 = ±0.2 V), lower leakage (<5 µA), and optimized thermal resistance for compact board space - making it preferable for precision analog references where DO-35 fit is mandatory.

Availability

HZS5BLL-JTA is available at Aetrix Electronics and suitable for industrial power monitoring, automotive sensor biasing, IoT node voltage reference, and programmable logic supply clamp applications requiring stable component supply, long-lifecycle availability, and traceable sourcing.

Supply support for HZS5BLL-JTA 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

ROHM Semiconductor is a Japanese semiconductor manufacturer specializing in analog, power, and sensor solutions for automotive, industrial, and consumer markets.

HZS5BLL-JTA belongs to the HZS Series of silicon epitaxial planar Zener diodes, engineered specifically for high-stability, low-noise voltage reference in space-constrained and thermally aggressive power supply designs.

FAQ

What is the exact zener voltage range for HZS5BLL-JTA?

HZS5BLL-JTA has a guaranteed zener voltage range of 4.6 V to 4.8 V at test current I_Z = 5 mA, corresponding to Grade B1 per ROHM's HZS Series specification sheet ADE-208-120A(Z) Rev 1. This narrow ±0.2 V window ensures high-precision regulation without post-calibration in analog front-end circuits.

Is HZS5BLL-JTA suitable for surface-mount assembly?

No - HZS5BLL-JTA uses a DO-35 glass axial package with radial leads intended for through-hole mounting. It is explicitly designed for 5 mm-pitch high-speed automatic insertion equipment, not reflow soldering or pick-and-place SMT processes. For SMT equivalents, consider ROHM's UDZS series Schottky Zeners.

What is the maximum reverse voltage before breakdown for HZS5BLL-JTA?

The maximum reverse voltage before onset of significant conduction is defined by the test condition V_R = 1.5 V, at which reverse current I_R is guaranteed ≤5 µA. Breakdown occurs sharply near 4.6–4.8 V; operation below 1.5 V ensures negligible leakage and no risk of premature conduction.

Does HZS5BLL-JTA have a specified temperature coefficient?

Yes - Figure 2 in the HZS Series datasheet shows temperature coefficient (TC) versus zener voltage. For HZS5 (4.6–4.8 V), TC is approximately −2.5 mV/°C (or −0.05%/°C), indicating slight negative drift with rising temperature - a typical behavior for low-voltage Zeners that must be accounted for in precision reference designs.

Can HZS5BLL-JTA replace a 5.1 V Zener diode in existing designs?

No - HZS5BLL-JTA is rated 4.6–4.8 V, not 5.1 V. Substituting it for a 5.1 V device (e.g., 1N4733A) would reduce reference voltage by ~400 mV, potentially causing undervoltage faults in logic interfaces or ADC full-scale errors. Always verify system-level voltage margin before replacement.