Diodes Incorporated MMBZ5245BT-7-F

Overview

MMBZ5245BT-7-F from Diodes Incorporated is a 150 mW, 15 V ±5% surface-mount Zener diode in SOT-523 package, rated for 8.5 mA test current and 16 Ω dynamic impedance at 1 kHz, used for precision voltage regulation and overvoltage protection in low-power analog sensor interfaces and microcontroller I/O clamping circuits.

For engineers reviewing the MMBZ5245BT-7-F datasheet, MMBZ5245BT-7-F pinout, MMBZ5245BT-7-F application, or MMBZ5245BT-7-F equivalent, key selection criteria include Zener voltage tolerance (±5%), low leakage (<0.1 µA at 11 V), thermal resistance (833 °C/W), and RoHS-compliant green packaging suitable for automated SMT assembly.

Technical Context

This device operates as a two-terminal voltage reference with sharp reverse breakdown at nominal 15 V, leveraging planar die construction for stable Zener characteristics across -65°C to +150°C ambient range. Its 150 mW power rating and 833 °C/W junction-to-ambient thermal resistance define safe operating limits on standard FR-4 PCBs with recommended pad layout.

The 16 Ω Zener impedance at 8.5 mA and 1 kHz, combined with <0.1 µA reverse leakage at 11 V, enables accurate voltage clamping in signal conditioning paths where minimal loading and tight regulation are required-such as ADC reference stabilization and ESD-protected GPIO lines.

Key Specifications

Pinout & Package

SOT-523 is a 3-pin ultra-miniature plastic package with anode and cathode terminals only (pin 1 = anode, pin 2 = cathode, pin 3 = not connected); polarity is marked by cathode band on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584C15LT1G and MMBZ5245BS-7-F, MMBZ5245BT-7-F delivers optimal balance of ultra-compact size, certified green compliance, and proven thermal performance in high-density automated assembly-making it preferred for volume consumer electronics where footprint and RoHS are non-negotiable.

Availability

MMBZ5245BT-7-F is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, microcontroller I/O protection, and low-power battery monitoring requiring stable component supply and consistent Zener voltage performance across production batches.

Supply support for MMBZ5245BT-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.

This part belongs to the MMBZ52xxBT series of general-purpose Zener diodes designed specifically for space-constrained, high-reliability voltage regulation and transient suppression in portable and automotive-qualified electronics.

FAQ

What is the maximum reverse voltage before breakdown for MMBZ5245BT-7-F?

The nominal Zener voltage is 15 V with a guaranteed range of 14.25 V to 15.75 V at 8.5 mA test current. Breakdown begins gradually below this range; the device exhibits <0.1 µA leakage at 11 V and reaches full regulation within ±5% at rated current. No hard "maximum reverse voltage" is defined-it operates continuously in reverse breakdown when properly current-limited.

Can MMBZ5245BT-7-F be used in place of a 1N4744A?

No-MMBZ5245BT-7-F is a 15 V, 150 mW SOT-523 Zener, while 1N4744A is a 14 V, 1 W through-hole device in DO-41 package. The voltage mismatch (14 V vs. 15 V), power rating difference (10× higher), and incompatible package prevent direct substitution without circuit redesign and thermal validation.

Is the SOT-523 package lead-free and RoHS compliant?

Yes-MMBZ5245BT-7-F uses matte tin plating over Alloy 42 leadframe and green molding compound, meeting RoHS Directive 2011/65/EU and classified as "Green" per Diodes Incorporated's policy. It is rated Moisture Sensitivity Level 1 per J-STD-020D and fully compatible with lead-free reflow profiles.

What is the typical capacitance at 0 V bias for this Zener diode?

Capacitance is not specified in the DS30267 datasheet for MMBZ5245BT-7-F. Figure 4 shows typical total capacitance versus nominal Zener voltage across the series: at 15 V, capacitance is approximately 15 pF. This value applies under zero-bias conditions and is relevant for high-frequency noise filtering applications.