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

Diodes Incorporated ZMM5249B-7

Name: ZMM5249B-7
Brand: Diodes Incorporated
SKU: ZMM5249B-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: ZMM5249B-7

Manufacturer:: Diodes Incorporated

Category:: Single Zener Diodes

Package:: DO-213AC, MINI-MELF, SOD-80

Datasheet:: ZMM5249B-7.pdf

Description:: DIODE ZENER 19V 500MW MINI MELF

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,346

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

Product details

Overview

ZMM5249B-7 from Diodes Incorporated is a 19 V, 500 mW surface-mount Zener diode in MiniMELF (DO-213AA) glass package, with 6.6 mA test current, 23 Ω dynamic impedance at 19 V, and +0.086 %/°C temperature coefficient. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.

For engineers reviewing the ZMM5249B-7 datasheet, ZMM5249B-7 pinout, ZMM5249B-7 application, or ZMM5249B-7 equivalent, this device serves as a stable, low-drift 19 V shunt regulator for power supply feedback, sensor biasing, and voltage clamping where thermal stability and miniature footprint are critical.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain a stable 19 V reference across its terminals under controlled current conditions. Its ±0.95 V tolerance (18.05–19.95 V), +0.086 %/°C tempco, and 23 Ω Zener impedance at I_ZT = 6.6 mA define its regulation accuracy and load sensitivity.

The MiniMELF hermetic glass package enables operation from –65 °C to +175 °C with 300 °C/W junction-to-ambient thermal resistance. Forward voltage is specified at 1.5 V @ 200 mA, confirming standard silicon PN junction behavior for polarity verification.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage	19 V nominal, 18.05–19.95 V range at 6.6 mA - defines regulated output voltage tolerance for reference design
Power Dissipation	500 mW maximum - sets absolute upper limit for continuous DC or pulsed power handling
Zener Impedance	23 Ω at 6.6 mA - determines output voltage variation under changing load current
Tempco	+0.086 %/°C - quantifies voltage drift per degree ambient change; critical for wide-temperature applications
Reverse Leakage	0.1 µA max @ 14 V - ensures minimal quiescent current in high-impedance bias networks
Forward Voltage	1.5 V @ 200 mA - used for cathode identification and forward conduction verification
Junction Temp Range	–65 to +175 °C - supports operation in automotive under-hood and industrial environments

Pinout & Package

MiniMELF (DO-213AA) hermetic glass package: cylindrical body, axial leads, cathode band marking. No discrete pins-two-terminal device with polarity indicated by single black band.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener cathode reference ground	Connected to lower potential side; used for polarity check and circuit return path
Cathode	Zener breakdown terminal / regulated voltage output	Marked with black band; connected to higher potential node to establish 19 V reference

Key Features

Feature	Design Value
Precision voltage reference	19 V ±0.95 V tolerance at 6.6 mA enables accurate feedback in linear regulators
Low temperature drift	+0.086 %/°C tempco minimizes output shift across –40 to +125 °C operating range
Hermetic MiniMELF package	DO-213AA glass construction ensures long-term reliability and moisture resistance
Low leakage performance	0.1 µA max reverse current at 14 V preserves battery life in always-on sensing nodes

Applications

Power Supply Feedback

Sensor Bias Reference

Use Scenario: Used in TL431-based adjustable LDO feedback network to set 19 V output.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 19 V threshold for error amplifier comparison.

Use Value: Enables precise output regulation without external trimming; ±0.95 V tolerance meets industrial PSU specs.

Use Scenario: Supplies bias voltage to MEMS pressure sensor bridge in automotive tire pressure monitor.

IC Role / Device Role / Timing Role: Low-drift 19 V reference for ratiometric excitation of Wheatstone bridge.

Use Value: +0.086 %/°C tempco limits bridge offset drift to <0.1% FS over –40 to +125 °C.

Voltage Clamping

Overvoltage Protection

Use Scenario: Connected across microcontroller I/O line to clamp transients to 19 V.

IC Role / Device Role / Timing Role: Fast-acting shunt limiter absorbing ESD or inductive kick energy.

Use Value: 500 mW rating sustains 100 ms pulses per JEDEC; 23 Ω Z_ZT ensures clamping within 0.5 V of nominal.

Use Scenario: Placed on 24 V rail input to protect downstream DC-DC converter from surge events.

IC Role / Device Role / Timing Role: Primary overvoltage crowbar element triggering shutdown when rail exceeds 19.95 V.

Use Value: Tight 18.05–19.95 V window allows reliable trip margin above nominal 24 V while avoiding nuisance trips.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX55C19-TR	Same 19 V nominal, but ±5% tolerance (18.05–19.95 V), 500 mW, DO-35 package	Larger DO-35 package increases board area; same thermal resistance (300 °C/W)	Select when legacy through-hole compatibility required or MiniMELF assembly capability unavailable
MMSZ5249B-7	Identical electrical specs, SOD-123 plastic package, 350 mW rating, 200 °C/W R_JA	Lower power derating above 70 °C due to plastic package thermal limits	Select for cost-sensitive consumer designs where hermeticity and extended temperature range are not required

Compared with BZX55C19-TR and MMSZ5249B-7, ZMM5249B-7 offers superior thermal stability (–65 to +175 °C) and hermetic reliability in MiniMELF form factor-critical for automotive and industrial applications demanding long-term parametric consistency.

Availability

ZMM5249B-7 is available at Aetrix Electronics and suitable for power supply feedback, sensor bias reference, voltage clamping, and overvoltage protection requiring stable component supply across automotive, industrial control, and medical instrumentation programs.

Supply support for ZMM5249B-7 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 semiconductor company specializing in discrete, analog, and mixed-signal devices for power management, signal integrity, and connectivity applications.

ZMM52xxB series belongs to Diodes' precision Zener diode product line, engineered for high-stability voltage reference and regulation in space-constrained, thermally demanding environments.

FAQ

What is the maximum continuous reverse current for ZMM5249B-7?

The device is rated for 6.6 mA test current (I_ZT) and supports up to 23 mA continuous reverse current before exceeding 500 mW dissipation at 25 °C ambient. Derating is required above 25 °C per the power vs. ambient temperature curve: at 70 °C, max I_Z drops to ~12 mA to stay within thermal limits.

Can ZMM5249B-7 be used in place of ZMM5248B or ZMM5250B?

No-ZMM5248B is 18 V (±0.9 V), ZMM5250B is 20 V (±1.0 V); ZMM5249B's 19 V (±0.95 V) rating is distinct. Substitution requires verifying system-level voltage margin, tempco impact (+0.086 %/°C), and impedance (23 Ω vs. 21 Ω for ZMM5248B, 25 Ω for ZMM5250B) to avoid regulation error or instability.

Is the cathode band orientation standardized for MiniMELF packages?

Yes-the black cathode band on ZMM5249B-7 aligns with JEDEC DO-213AA standard: when viewed with band on left, anode is right lead. This matches industry practice for all MiniMELF Zeners and ensures consistent PCB layout and automated optical inspection alignment.

Does ZMM5249B-7 have a SPICE model available?

Yes-Diodes Incorporated provides verified SPICE models for ZMM5235B, ZMM5260B, and ZMM5262B in the DS30024 datasheet. While ZMM5249B-7 is not individually modeled, its parameters (V_Z, Z_ZT, tempco, C_j) fall within the documented family trends and can be accurately approximated using ZMM5260B's model with adjusted V_Z and Z_ZT values.

ZMM5249B-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: DO-213AC, MINI-MELF, SOD-80

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 19 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 23 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 14 V

Voltage - Forward (Vf) (Max) @ If:: 1.5 V @ 200 mA

Operating Temperature:: -65°C ~ 175°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: Mini MELF

ZMM5249B-7 FAQ

1.How can I place an order for ZMM5249B-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for ZMM5249B-7 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 ZMM5249B-7 reliable?

The price and inventory of ZMM5249B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMM5249B-7 is usually 5 days.

3.What payment methods are accepted for ZMM5249B-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMM5249B-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZMM5249B-7?

ZMM5249B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZMM5249B-7 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 ZMM5249B-7?

For technical support, including ZMM5249B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMM5249B-7 requirements.

6.How does Aetrix verify that ZMM5249B-7 is sourced from the original manufacturer or authorized distributors?

All ZMM5249B-7 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 ZMM5249B-7 meets industry standards.

7.What is the process for return or replacement of ZMM5249B-7?

All ZMM5249B-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZMM5249B-7, 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 ZMM5249B-7 part is unused and in its original packaging.

Return procedure for ZMM5249B-7:

1.Submit a request within 90 days.

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

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…