Renesas HZM9CTL

Overview

HZM9CTL from Renesas Electronics (formerly Hitachi) is a silicon epitaxial planar Zener diode designed for precision voltage stabilization in low-power analog and reference circuits. It delivers a nominal zener voltage of 9.1 V (min 8.56 V, max 9.55 V at I_Z = 5 mA), with dynamic resistance of 30 Ω, reverse current ≤2 µA at V_R = 6.0 V, and power dissipation rated at 200 mW in the MPAK package. It is commonly used in voltage reference stages of sensor signal conditioning and power supply feedback loops.

For engineers reviewing the HZM9CTL datasheet, HZM9CTL pinout, HZM9CTL application, or HZM9CTL equivalent, key selection criteria include its tight zener voltage tolerance (±5% grade B), low dynamic impedance, temperature coefficient near zero (~0.03 %/°C at 9.1 V), and suitability for high-density SMT layouts requiring stable 9.1 V references under low-current conditions.

Technical Context

The HZM9CTL operates as a two-terminal voltage reference device relying on controlled avalanche breakdown in a planar-diffused silicon junction. Its zener voltage is specified at 5 mA test current, with pulse testing (PW = 40 ms) to limit self-heating during characterization. The device exhibits a positive temperature coefficient of approximately +0.03 %/°C near 9.1 V, indicating minimal drift over ambient temperature ranges.

It is optimized for operation in the 5 mA to 20 mA range, where dynamic resistance remains stable at ≤30 Ω. Junction temperature must be maintained below 150°C, and derating begins above 25°C ambient per Fig.3 - power dissipation drops linearly to ~100 mW at 75°C ambient.

Key Specifications

Pinout & Package

Package: MPAK (JEDEC SC-59A, EIAJ SC-59A), surface-mount, 3-pin molded plastic case with exposed pad thermal path. Dimensions: 2.8 mm × 1.9 mm × 0.95 mm (L×W×H), weight 0.011 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C9V1 and MMSZ5240B, the HZM9CTL offers identical voltage tolerance and tighter dynamic resistance (30 Ω vs. ≥35 Ω), while fitting the smaller MPAK footprint - making it optimal for space-constrained, low-drift analog reference designs where 200 mW suffices.

Availability

HZM9CTL is available at Aetrix Electronics and suitable for industrial sensor reference, low-power LDO feedback, and portable instrumentation bias applications requiring stable component supply and long-term parametric consistency.

Supply support for HZM9CTL 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, formed from the merger of NEC Electronics and Renesas Technology, is a global semiconductor leader specializing in microcontrollers, analog, and power devices.

The HZM-N Series was developed by Hitachi (now part of Renesas) specifically for high-accuracy, low-power voltage stabilization in compact SMT systems - targeting analog signal chains, sensor interfaces, and power management feedback loops.

FAQ

What is the exact zener voltage range for HZM9CTL at 5 mA?

The HZM9CTL has a guaranteed zener voltage range of 8.56 V to 9.55 V when tested at I_Z = 5 mA and T_a = 25°C. This corresponds to the "B" grade specification in the HZM-N Series datasheet (Rev. 3, Jan. 1999). The typical value is 9.1 V, and the tolerance is ±5% relative to nominal.

Is HZM9CTL compatible with reflow soldering processes?

Yes, the HZM9CTL in MPAK (SC-59A) package is qualified for standard lead-free reflow soldering per J-STD-020. Its maximum peak temperature rating is 260°C for ≤30 seconds, and it withstands thermal cycling without parameter shift. The package's glass-epoxy substrate and Cu foil construction ensure robustness during assembly.

Does HZM9CTL have a specified temperature coefficient?

Yes - the HZM9CTL exhibits a temperature coefficient (γ) of approximately +0.03 %/°C at V_Z ≈ 9.1 V, as shown in Fig.2 of the HZM-N Series datasheet. This near-zero coefficient minimizes reference drift across −25°C to +85°C ambient, making it suitable for stable analog references.

What is the meaning of the "CTL" suffix in HZM9CTL?

The "CTL" suffix in HZM9CTL denotes tape-and-reel packaging (TL/TR) per Hitachi's ordering convention. It indicates the part is supplied in embossed carrier tape, compatible with automated pick-and-place equipment. The base device is HZM9.1N (grade B), and CTL confirms taping format - no electrical or parametric difference from HZM9.1NBTL.

Can HZM9CTL replace TL431 in shunt regulator applications?

The HZM9CTL can serve as a passive shunt reference in place of TL431 only in fixed-voltage, low-current (<5 mA), non-feedback configurations. Unlike the TL431, it lacks an internal op-amp or adjustable reference, so it cannot regulate actively or drive gate/base loads. For 9.1 V fixed reference buffering, HZM9CTL is viable; for programmable or high-current regulation, TL431 remains necessary.