onsemi MMBZ5227ELT1

Overview

MMBZ5227ELT1 from onsemi is a 3.6 V nominal Zener voltage regulator diode in SOT-23 package, rated for 225 mW power dissipation at 25°C on FR-5 board, with 1200 Ω maximum Zener impedance at 20 mA test current and 0.25 μA reverse leakage at 1 V reverse bias - used for precision low-power voltage reference and overvoltage clamping in portable power rails.

For engineers reviewing the MMBZ5227ELT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5.6% at 3.6 V), thermal resistance (556 °C/W on FR-5), ESD robustness (>16 kV HBM), and SOT-23 footprint compatibility with high-density PCB layouts.

Technical Context

This device operates as a two-terminal voltage reference using avalanche and Zener breakdown mechanisms depending on voltage range; its 3.6 V nominal Zener voltage falls in the transition region where temperature coefficient is near zero (≈0 mV/°C), minimizing drift across −65°C to +150°C junction temperature range.

The SOT-23 package features void-free thermosetting plastic construction, UL 94 V-0 flammability rating, and cathode polarity indicated by band; pin 2 is internally unconnected, enabling simplified layout and eliminating unintended parasitic paths in clamping circuits.

Key Specifications

Pinout & Package

SOT-23 (TO-236) surface-mount package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch, void-free thermosetting plastic case with corrosion-resistant solderable finish; cathode identified by band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C3V6LT1G and MMBZ5227BS, the MMBZ5227ELT1 offers optimal balance of ultra-low leakage, zero-tempco performance, and SOT-23 manufacturability - making it preferred for portable and industrial low-power reference designs where long-term stability and ESD resilience are critical.

Availability

MMBZ5227ELT1 is available at Aetrix Electronics and suitable for portable electronics, industrial sensor interfaces, and USB peripheral protection requiring stable component supply with full traceability and lifecycle management.

Supply support for MMBZ5227ELT1 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The MMBZ52xxELT1G series was engineered specifically for compact, high-reliability voltage regulation in space-constrained portable and industrial systems - emphasizing low leakage, high ESD immunity, and thermal stability in SOT-23 packaging.

FAQ

What is the exact Zener voltage tolerance for MMBZ5227ELT1 at 20 mA test current?

The MMBZ5227ELT1 has a guaranteed Zener voltage range of 3.50 V to 3.70 V at I_ZT = 20 mA, representing a ±5.6% tolerance around the 3.6 V nominal value. This specification is verified per onsemi's August 2024 Rev. 9 datasheet and applies under TA = 25°C conditions with pulse testing to avoid self-heating effects. The MMBZ5227ELT1 maintains this tolerance across its qualified operating temperature range.

Does MMBZ5227ELT1 have a functional pin 2 connection?

No - pin 2 of the MMBZ5227ELT1 is explicitly designated as "No Connection" in the official datasheet's pinout diagram (Style 8). It is internally unconnected and must remain floating on the PCB; routing or soldering to pin 2 introduces no electrical benefit and risks mechanical stress or contamination-related reliability issues. The MMBZ5227ELT1 functions correctly with only pins 1 (anode) and 3 (cathode) populated.

Can MMBZ5227ELT1 be used in automotive applications?

The standard MMBZ5227ELT1 is not AEC-Q101 qualified; however, the SZMMBZ5227ELT1G variant - identical in electrical and thermal specs but with automotive-grade process controls and PPAP documentation - is certified for automotive use. For non-safety-critical cabin electronics operating within −40°C to +125°C, the MMBZ5227ELT1 may be deployed subject to system-level qualification, but the SZ prefix version is required for formal automotive compliance. Both share the same MMBZ5227ELT1 marking code and SOT-23 footprint.

What is the maximum allowable soldering temperature for MMBZ5227ELT1?

The MMBZ5227ELT1 supports a maximum soldering temperature of 260°C for 10 seconds, per its mechanical characteristics table. This aligns with standard lead-free reflow profiles (e.g., JEDEC J-STD-020) and ensures bond integrity without degrading the void-free thermosetting plastic case or internal die attach. Exceeding this limit risks delamination or parametric shift; the MMBZ5227ELT1 must be placed prior to peak reflow and not subjected to multiple thermal cycles above 220°C.

How does the ESD rating of MMBZ5227ELT1 compare to typical consumer-grade Zeners?

The MMBZ5227ELT1 achieves Class 3 HBM ESD rating (>16 kV), significantly exceeding the 2–4 kV typical of generic Zener diodes. This is achieved via optimized junction design and passivation - enabling direct integration into handheld device front-end circuits without additional TVS staging. In contrast, most standard Zeners (e.g., 1N4728A) lack specified HBM ratings and require external protection. The MMBZ5227ELT1's ESD robustness is intrinsic and tested per ANSI/ESDA/JEDEC JS-001.