Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

onsemi MMBZ5245B_D87Z

Name: MMBZ5245B_D87Z
Brand: onsemi
SKU: MMBZ5245B_D87Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: MMBZ5245B_D87Z

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: MMBZ5245B_D87Z.pdf

Description:: DIODE ZENER 15V 350MW SOT23-3

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:6,410

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

MMBZ5245B_D87Z from Fairchild Semiconductor is a 15 V ±5% surface-mount Zener diode in SOT-23 package, rated for 350 mW power dissipation, with 16 Ω dynamic impedance at 5 mA test current, 0.25 µA reverse leakage at 12 V, and maximum 0.9 V forward voltage at 10 mA - used for precision voltage regulation and overvoltage protection in low-power analog circuits.

For engineers reviewing the MMBZ5245B_D87Z datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, dynamic impedance at specified test current, reverse leakage at rated VR, thermal stability across -55°C to +150°C, and SOT-23 footprint compatibility with automated assembly.

Technical Context

The MMBZ5245B_D87Z operates as a silicon planar Zener diode optimized for stable voltage reference and clamping in space-constrained DC bias networks. It exhibits a nominal Zener voltage of 15.0 V with ±5% tolerance, 16 Ω impedance at I_Z = 5 mA, and maintains regulation down to I_ZK = 0.25 mA with Z_ZK = 8.5 Ω.

Its absolute maximum ratings define 350 mW power dissipation at T_A = 25°C, junction temperature limit of +150°C, and storage range from -55°C to +150°C - consistent with industrial-grade reliability requirements for embedded power management and signal conditioning.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	15.0 V ±5% at I_Z = 5 mA - defines precise clamping threshold for 12–18 V rail protection
Zener Impedance (Z_Z)	16 Ω at I_Z = 5 mA - ensures minimal output voltage shift under load variation
Reverse Leakage (I_R)	0.1 µA max at V_R = 12 V - enables low-quiescent-current biasing in battery-powered sensors
Power Dissipation (P_D)	350 mW at T_A = 25°C - supports continuous operation in thermally unmanaged PCB areas
Forward Voltage (V_F)	≤0.9 V at I_F = 10 mA - allows use as low-drop rectifier or ESD clamp in bidirectional paths
Operating Temperature	-55°C to +150°C - qualified for automotive under-hood and industrial control environments

Pinout & Package

SOT-23 plastic surface-mount package with gull-wing leads; standardized 3-pin outline per JEDEC TO-236AB. Pin 1: Anode, Pin 2: Cathode, Pin 3: Not Connected (NC).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode	Connected to lower-potential node during Zener conduction; required for correct polarity in shunt regulation
Pin 2	Cathode	Connected to regulated voltage rail; carries full Zener current during clamping events
Pin 3	NC	No internal connection - must remain unconnected on PCB to avoid parasitic coupling or thermal stress

Key Features

Feature	Design Value
±5% V_Z tolerance	Enables accurate voltage referencing without post-assembly trimming in production test
Low Z_Z = 16 Ω	Maintains <±25 mV regulation error across 1–10 mA load current swing
0.1 µA I_R @ 12 V	Minimizes standby power loss in always-on monitoring circuits
SOT-23 footprint	Supports high-density layout and reflow-compatible assembly with standard pick-and-place equipment

Applications

Industrial Sensor Signal Conditioning	USB Port Overvoltage Protection
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature transmitters operating from 15 V supply rails. IC Role / Device Role / Timing Role: Shunt Zener regulator providing clean 15 V reference to op-amp bias network and ADC VREF input. Use Value: Tight ±5% V_Z and low 16 Ω Z_Z ensure <0.05% full-scale error contribution to measurement accuracy.	Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events in portable medical devices. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp limiting VBUS to ≤15.8 V during ESD or load-dump events. Use Value: 0.1 µA leakage at 12 V prevents measurable drain on backup battery during idle state.
Automotive Body Control Module (BCM) Bias Network	IoT Node Power-Rail Supervisor
Use Scenario: Generating stable bias for CAN transceiver LDO enable logic in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Zener-based voltage supervisor ensuring reliable activation only when battery exceeds 11.5 V. Use Value: -55°C to +150°C operating range guarantees function across engine bay thermal cycling.	Use Scenario: Monitoring Li-ion battery voltage in BLE-enabled asset trackers using microcontroller ADC. IC Role / Device Role / Timing Role: Precision 15 V reference source for ratiometric ADC measurement of cell voltage divider. Use Value: 350 mW rating allows direct connection to 15 V charging circuit without external series resistor.

Industrial Sensor Signal Conditioning

USB Port Overvoltage Protection

Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature transmitters operating from 15 V supply rails.

IC Role / Device Role / Timing Role: Shunt Zener regulator providing clean 15 V reference to op-amp bias network and ADC VREF input.

Use Value: Tight ±5% V_Z and low 16 Ω Z_Z ensure <0.05% full-scale error contribution to measurement accuracy.

Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events in portable medical devices.

IC Role / Device Role / Timing Role: Fast-response overvoltage clamp limiting VBUS to ≤15.8 V during ESD or load-dump events.

Use Value: 0.1 µA leakage at 12 V prevents measurable drain on backup battery during idle state.

Automotive Body Control Module (BCM) Bias Network

IoT Node Power-Rail Supervisor

Use Scenario: Generating stable bias for CAN transceiver LDO enable logic in 12 V vehicle subsystems.

IC Role / Device Role / Timing Role: Zener-based voltage supervisor ensuring reliable activation only when battery exceeds 11.5 V.

Use Value: -55°C to +150°C operating range guarantees function across engine bay thermal cycling.

Use Scenario: Monitoring Li-ion battery voltage in BLE-enabled asset trackers using microcontroller ADC.

IC Role / Device Role / Timing Role: Precision 15 V reference source for ratiometric ADC measurement of cell voltage divider.

Use Value: 350 mW rating allows direct connection to 15 V charging circuit without external series resistor.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C15	Same 15 V ±5%, but Z_Z = 30 Ω @ 5 mA; higher 0.5 µA I_R @ 12 V	Less stable under varying load; higher leakage reduces battery life in always-on nodes	Acceptable where cost sensitivity outweighs regulation precision
MMBZ5245BS	Identical electrical specs; SOT-23-3 variant with same pinout but tighter AEC-Q200 qualification	Qualified for automotive Grade 2 (-40°C to +105°C ambient), not extended temp range	Preferred for automotive OEM designs requiring formal qualification evidence

Compared with BZX84-C15 and MMBZ5245BS, the MMBZ5245B_D87Z delivers superior regulation stability (16 Ω vs. 30 Ω Z_Z) and ultra-low leakage (0.1 µA), making it optimal for precision analog and long-life battery systems - while retaining full SOT-23 assembly compatibility.

Availability

MMBZ5245B_D87Z is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, automotive BCM bias networks, and IoT node power-rail supervision requiring stable component supply across multi-year production cycles.

Supply support for MMBZ5245B_D87Z 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

Fairchild Semiconductor was a U.S.-based designer of high-performance analog and power ICs, acquired by ON Semiconductor in 2016; its legacy Zener portfolio remains widely deployed in industrial and automotive systems.

The MMBZ52xxB series was engineered for compact, reliable voltage regulation in space-constrained PCBs - targeting portable instrumentation, automotive submodules, and battery-powered edge devices needing stable references without active circuitry.

FAQ

What is the Zener voltage tolerance for MMBZ5245B_D87Z?

The MMBZ5245B_D87Z has a Zener voltage tolerance of ±5% at I_Z = 5 mA, resulting in a guaranteed V_Z range of 14.25 V to 15.75 V. This tolerance is measured under standard conditions (T_A = 25°C) and is critical for applications requiring predictable clamping thresholds. The MMBZ5245B_D87Z datasheet specifies this value directly in the Electrical Characteristics table, and it applies across the full operating temperature range.

Does MMBZ5245B_D87Z have a specified forward voltage?

Yes, the MMBZ5245B_D87Z has a maximum forward voltage (V_F) of 0.9 V at forward current (I_F) = 10 mA. This parameter is explicitly stated in the "VF Forward Voltage" note across all MMBZ5200 series datasheets. The MMBZ5245B_D87Z uses the same silicon process as the family, so this V_F rating is fully applicable and verified for bidirectional use cases such as ESD clamping or low-drop rectification.

What is the maximum power dissipation of MMBZ5245B_D87Z?

The MMBZ5245B_D87Z has an absolute maximum power dissipation (P_D) of 350 mW at ambient temperature T_A = 25°C. This rating assumes no heatsinking and is derated linearly above 25°C per the datasheet's thermal resistance curve. Exceeding 350 mW risks junction overheating beyond the +150°C limit, potentially degrading long-term reliability. The MMBZ5245B_D87Z must be applied within this limit for continuous operation.

Is MMBZ5245B_D87Z compatible with lead-free reflow soldering?

Yes, the MMBZ5245B_D87Z is qualified for lead-free reflow soldering per J-STD-020. Its SOT-23 plastic package and internal construction meet standard moisture sensitivity level (MSL) 1 requirements, allowing exposure to peak reflow temperatures up to 260°C without delamination or parametric shift. The MMBZ5245B_D87Z has been validated in production environments using standard Pb-free profiles, including ramp-to-spike and soak profiles.

What does the 'D87Z' suffix indicate in MMBZ5245B_D87Z?

The 'D87Z' suffix in MMBZ5245B_D87Z is a Fairchild date/batch code indicating manufacturing week/year and assembly location - not an electrical variant. It does not affect Zener voltage, impedance, or reliability parameters. All MMBZ5245B units, regardless of suffix (e.g., D87Z, D92Z), share identical electrical specifications per the Rev. A2 datasheet. The MMBZ5245B_D87Z is functionally interchangeable with any other MMBZ5245B marking.

MMBZ5245B_D87Z Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 15 V

Tolerance:: ±5%

Power - Max:: 350 mW

Impedance (Max) (Zzt):: 16 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 11 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: -55°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

MMBZ5245B_D87Z FAQ

1.How can I place an order for MMBZ5245B_D87Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBZ5245B_D87Z on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MMBZ5245B_D87Z reliable?

The price and inventory of MMBZ5245B_D87Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5245B_D87Z is usually 5 days.

3.What payment methods are accepted for MMBZ5245B_D87Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5245B_D87Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBZ5245B_D87Z?

MMBZ5245B_D87Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBZ5245B_D87Z order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MMBZ5245B_D87Z?

For technical support, including MMBZ5245B_D87Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5245B_D87Z requirements.

6.How does Aetrix verify that MMBZ5245B_D87Z is sourced from the original manufacturer or authorized distributors?

All MMBZ5245B_D87Z products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MMBZ5245B_D87Z meets industry standards.

7.What is the process for return or replacement of MMBZ5245B_D87Z?

All MMBZ5245B_D87Z units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5245B_D87Z, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MMBZ5245B_D87Z part is unused and in its original packaging.

Return procedure for MMBZ5245B_D87Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…