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

Diodes Incorporated ZMM5245B-7

Name: ZMM5245B-7
Brand: Diodes Incorporated
SKU: ZMM5245B-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZMM5245B-7

Manufacturer:: Diodes Incorporated

Category:: Single Zener Diodes

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

Datasheet:: ZMM5245B-7.pdf

Description:: DIODE ZENER 15V 500MW MINI MELF

Quantity:: RFQ Add To RFQ list

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Inventory:6,453

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Product details

Overview

ZMM5245B-7 from Diodes Incorporated is a 15 V, 500 mW surface-mount Zener diode in MiniMELF (DO-213AA) glass package, with nominal zener voltage tolerance ±5%, dynamic impedance 16 Ω at 8.5 mA, and temperature coefficient +0.082 %/°C. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.

For engineers reviewing the ZMM5245B-7 datasheet, ZMM5245B-7 pinout, ZMM5245B-7 application, or ZMM5245B-7 equivalent, key selection criteria include zener voltage accuracy at I_ZT = 8.5 mA, thermal resistance (300 °C/W), reverse leakage (<0.1 µA at 12 V), junction capacitance (~12 pF), and MiniMELF mechanical compatibility with automated SMT placement.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable DC reference voltage under varying load and temperature conditions. Its hemispheric glass MiniMELF package ensures hermetic sealing and high reliability in industrial ambient environments up to +175 °C.

The device exhibits a positive temperature coefficient (+0.082 %/°C) above 10 V, enabling predictable drift compensation in multi-diode reference strings. Junction-to-ambient thermal resistance of 300 °C/W defines its derating curve - power dissipation drops linearly from 500 mW at 25 °C to zero at 175 °C ambient.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	15 V nominal, 14.25–15.75 V range at 8.5 mA - ensures ±5% regulation tolerance for precision biasing
Power Dissipation (P_D)	500 mW at T_A = 25 °C - sets maximum continuous DC or pulsed power in compact PCB layouts
Zener Impedance (Z_ZT)	16 Ω at I_ZT = 8.5 mA - determines output voltage stability under small-signal current variation
Reverse Leakage (I_R)	<0.1 µA at V_R = 12 V - guarantees minimal error current in high-impedance reference nodes
Temp Coefficient (TC)	+0.082 %/°C - enables predictable voltage drift correction in temperature-critical sensor front-ends
Junction Capacitance	~12 pF at V_R = 2.0 V - impacts high-frequency noise rejection and AC coupling behavior
Thermal Resistance (R_JA)	300 °C/W - defines required board copper area and airflow for thermal management

Pinout & Package

MiniMELF (DO-213AA) glass package: cylindrical hermetic construction, 3.3–3.7 mm length (A), 1.3–1.6 mm diameter (B), cathode band marking. Solderable per MIL-STD-202, Method 208.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Reference ground node in shunt regulator	Connected to system ground or lower-potential rail; carries forward current during transient clamping
Cathode	Zener breakdown terminal / Regulated output node	Provides stable 15 V reference when reverse-biased; connects to load or feedback point

Key Features

Feature	Design Value
Hermetic glass packaging	Enables operation from –65 °C to +175 °C with no moisture-induced parameter shift
Low dynamic impedance	16 Ω at test current ensures <15 mV output deviation for ±1 mA load change
Tight voltage tolerance	±5% (14.25–15.75 V) supports single-diode reference without trimming resistors
Low reverse leakage	<0.1 µA at 12 V minimizes quiescent current in battery-powered sensor references
MiniMELF footprint	Compatible with standard 0805–1206 pick-and-place equipment and reflow profiles

Applications

Industrial Sensor Reference

USB Port Overvoltage Clamp

Use Scenario: Precision 15 V reference for 16-bit ADC biasing in RTD temperature transmitters.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable excitation and offset calibration point.

Use Value: ±5% initial tolerance and +0.082 %/°C TC enable <0.1% total error across –40 to +85 °C operating range.

Use Scenario: Secondary overvoltage protection on USB 2.0 VBUS line against 20 V surge events.

IC Role / Device Role / Timing Role: Fast-acting clamp limiting VBUS to 15.75 V before TVS activation.

Use Value: 500 mW rating sustains 100 ms pulses per JEDEC; 12 pF capacitance avoids signal integrity degradation.

Programmable Logic Supply Clamp

Automotive Cabin Controller Bias

Use Scenario: Voltage clamp on FPGA I/O bank supply (VCCIO) to prevent latch-up during hot-swap.

IC Role / Device Role / Timing Role: Standby-mode shunt regulator absorbing transient energy during insertion.

Use Value: Low 0.1 µA leakage preserves sleep current budget; MiniMELF withstands automotive thermal cycling.

Use Scenario: Stable 15 V bias for LIN transceiver oscillator circuit in door module ECU.

IC Role / Device Role / Timing Role: Temperature-compensated reference source for clock generation stability.

Use Value: +0.082 %/°C TC matches oscillator drift profile, reducing calibration steps in production test.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX55C15-TR	Same 15 V nominal, but ±6% tolerance (14.1–15.9 V); higher Z_ZT = 30 Ω; DO-35 package	Larger through-hole footprint; less suitable for high-density SMT designs	Prefer for legacy through-hole boards where MiniMELF placement is unavailable
MMSZ5245ET1G	Same 15 V, ±5% tolerance; SOD-123 package; Z_ZT = 17 Ω; R_JA = 350 °C/W	Plastic package limits max T_j to +150 °C; lower thermal robustness in sealed enclosures	Choose when cost sensitivity outweighs extended temperature requirement

Compared with BZX55C15-TR and MMSZ5245ET1G, ZMM5245B-7 delivers tighter voltage matching, superior thermal endurance (175 °C), and lower capacitance - critical for high-accuracy analog and automotive under-hood use cases.

Availability

ZMM5245B-7 is available at Aetrix Electronics and suitable for industrial sensor reference, USB port overvoltage clamp, and programmable logic supply clamp applications requiring stable component supply and long-term obsolescence resilience.

Supply support for ZMM5245B-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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the US.

ZMM52xxB is part of Diodes' precision Zener diode family targeting high-reliability voltage reference and protection functions in industrial, automotive, and communications systems.

FAQ

What is the maximum reverse voltage before breakdown for ZMM5245B-7?

The ZMM5245B-7 begins controlled reverse breakdown at its nominal zener voltage of 15 V, with guaranteed regulation between 14.25 V and 15.75 V at 8.5 mA test current. Below 12 V, reverse leakage remains below 0.1 µA - no meaningful conduction occurs until near the specified V_Z range.

Can ZMM5245B-7 be used in place of a 1N4744A?

No - the 1N4744A is a 14 V, 1 W through-hole Zener (DO-41). ZMM5245B-7 is 15 V, 500 mW, MiniMELF surface-mount. Voltage mismatch (14 V vs. 15 V), power rating halved, and incompatible package prevent direct substitution without circuit redesign and thermal reassessment.

Does ZMM5245B-7 require a series current-limiting resistor in shunt regulator configuration?

Yes - like all shunt Zeners, it requires an external series resistor to set operating current within 8.5 mA ±20% for optimal regulation. The resistor value is calculated as R = (V_IN − 15 V) / I_Z, where I_Z must remain between 1 mA and 15 mA to stay within specified Z_ZT and TC performance bounds.

Is ZMM5245B-7 compliant with AEC-Q200 for automotive use?

ZMM5245B-7 is not AEC-Q200 qualified. While its operating temperature range (–65 °C to +175 °C) exceeds automotive under-hood requirements, Diodes Incorporated does not list this part in its AEC-Q200 stress-tested portfolio. For automotive applications, consider the AEC-Q200 qualified BZX84-C15 or MMBZ5245B variants.

ZMM5245B-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):: 15 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 16 Ohms

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

ZMM5245B-7 FAQ

1.How can I place an order for ZMM5245B-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for ZMM5245B-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 ZMM5245B-7 reliable?

The price and inventory of ZMM5245B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMM5245B-7 is usually 5 days.

3.What payment methods are accepted for ZMM5245B-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMM5245B-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZMM5245B-7?

ZMM5245B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZMM5245B-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 ZMM5245B-7?

For technical support, including ZMM5245B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMM5245B-7 requirements.

6.How does Aetrix verify that ZMM5245B-7 is sourced from the original manufacturer or authorized distributors?

All ZMM5245B-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 ZMM5245B-7 meets industry standards.

7.What is the process for return or replacement of ZMM5245B-7?

All ZMM5245B-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZMM5245B-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 ZMM5245B-7 part is unused and in its original packaging.

Return procedure for ZMM5245B-7:

1.Submit a request within 90 days.

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

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