My Inquiry
My Account
Diodes Incorporated ZMM5242B-7
- Part No.:
- ZMM5242B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
ZMM5242B-7.pdf
- Description:
- DIODE ZENER 12V 500MW MINI MELF
- Quantity:
- Payment:
- Shipping:
Inventory:6,607
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ZMM5242B-7 from Diodes Incorporated is a 12 V, 500 mW surface-mount Zener diode in MiniMELF (DO-213AA) glass package, with nominal zener voltage 12.0 V (min 11.4 V, max 12.6 V at IZT = 20 mA), zener impedance 30 Ω at IZT, and temperature coefficient +0.077 %/°C. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the ZMM5242B-7 datasheet, ZMM5242B-7 pinout, ZMM5242B-7 application, or ZMM5242B-7 equivalent, this part serves as a stable, low-drift 12 V shunt regulator for power supply feedback, sensor biasing, and voltage clamping where ±5% tolerance and thermal stability to +175°C are required.
Technical Context
This device operates as a reverse-biased silicon junction diode optimized for stable breakdown conduction at 12 V under controlled test conditions (IZT = 20 mA, TA = 25°C). Its hemispherical glass MiniMELF package enables high reliability and hermetic sealing, supporting operation across -65°C to +175°C ambient.
The ZMM5242B-7 exhibits a positive temperature coefficient (+0.077 %/°C), indicating increasing zener voltage with rising junction temperature - a key design consideration for temperature-sensitive references. Maximum reverse current is limited to 1.0 µA at rated VR (9.1 V), ensuring low leakage in standby modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12.0 V nominal, 11.4–12.6 V range at 20 mA - defines regulated output level with ±5% initial tolerance |
| Power Dissipation (PD) | 500 mW - sets maximum continuous DC or pulsed power handling before thermal derating |
| Zener Impedance (ZZT) | 30 Ω at IZT = 20 mA - determines regulation stiffness and AC ripple rejection capability |
| Reverse Current (IR) | 1.0 µA at VR = 9.1 V - specifies leakage level below breakdown, critical for low-power sleep modes |
| Temp Coefficient (TC) | +0.077 %/°C - quantifies voltage drift per degree rise; used to calculate error budget in wide-temp designs |
| Junction-to-Ambient RJA | 300 °C/W - defines thermal resistance for PCB layout cooling requirements and ambient derating curves |
| Forward Voltage (VF) | 1.5 V at IF = 200 mA - relevant for forward-conduction use cases such as ESD clamping or polarity protection |
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 terminals per MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in shunt regulator | Connected to ground or lower-potential node when used in reverse-bias regulation |
| Cathode | Zener breakdown terminal / high-side connection | Connected to input voltage source; voltage referenced to anode during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MiniMELF package | Enables operation from -65°C to +175°C with long-term stability and moisture resistance |
| ±5% zener voltage tolerance | Supports tight reference accuracy without external trimming in cost-sensitive applications |
| +0.077 %/°C temperature coefficient | Allows predictable voltage drift modeling for compensation in industrial temperature ranges |
| 500 mW power rating with 300 °C/W RJA | Permits direct PCB mounting without heatsinking in low-power linear regulators and sensing circuits |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Voltage Reference |
|---|---|
Use Scenario: Providing stable 12 V bias to analog front-end op-amps in temperature-transmitter modules operating from 24 V loop supplies. IC Role / Device Role / Timing Role: Shunt voltage reference and overvoltage clamp protecting downstream signal chain components. Use Value: Maintains <±1% output variation across -40°C to +85°C due to known TC and low ZZT, reducing calibration burden. | Use Scenario: Generating precise 12 V reference for ADC internal scaling in battery-powered IoT edge nodes. IC Role / Device Role / Timing Role: Low-leakage (1.0 µA @ 9.1 V) shunt regulator enabling accurate VREF with minimal quiescent current draw. Use Value: Enables >10-year battery life by limiting reference circuit current to sub-µA levels during sleep cycles. |
| DC-DC Converter Feedback Network | ESD-Sensitive Interface Protection |
Use Scenario: Setting output voltage of isolated flyback converters via optocoupler feedback path with TL431 replacement. IC Role / Device Role / Timing Role: Precision zener element in resistor-divider network defining regulated output setpoint. Use Value: Delivers stable 12 V reference with <30 Ω dynamic impedance, minimizing load-regulation error across line and load variations. | Use Scenario: Clamping RS-485 transceiver I/O lines against transient surges in factory automation networks. IC Role / Device Role / Timing Role: Bidirectional ESD suppressor leveraging forward VF = 1.5 V and reverse breakdown at 12 V. Use Value: Absorbs 15 kV HBM ESD pulses while maintaining <1.0 µA leakage, preserving bus signal integrity during idle states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12 V zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C12 (ON Semiconductor) | Same 12 V nominal, but DO-35 package (larger, axial lead); 5% tolerance; ZZT = 30 Ω at 5 mA (not 20 mA) | Requires through-hole PCB layout; higher RJA (~500 °C/W) limits power handling in compact layouts | Preferred only where legacy DO-35 footprint or higher surge robustness is mandated |
| MMSZ5242ET1G (onsemi) | SOD-123 package; identical 12 V spec, 500 mW, 30 Ω ZZT at 20 mA; same TC (+0.077 %/°C) | Surface-mount compatible but plastic-molded (non-hermetic); rated only to +150°C junction | Valid drop-in for space-constrained boards where extended temperature range is not required |
Compared with BZX55C12 and MMSZ5242ET1G, the ZMM5242B-7 uniquely combines hermetic MiniMELF reliability, full -65°C to +175°C operation, and matched test conditions (20 mA IZT), making it optimal for high-reliability industrial and automotive under-hood applications.
Availability
ZMM5242B-7 is available at Aetrix Electronics and suitable for industrial sensor conditioning, microcontroller reference generation, DC-DC feedback networks, and ESD-sensitive interface protection requiring stable component supply and long-term parametric consistency.
Supply support for ZMM5242B-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 and manufacturing operations across Asia and the Americas.
The ZMM52xxB series belongs to Diodes' precision Zener diode product line, engineered specifically for stable voltage reference and clamping in harsh-environment industrial, automotive, and instrumentation applications.
FAQ
What is the maximum continuous power dissipation for ZMM5242B-7 at 70°C ambient?
At 70°C ambient, the ZMM5242B-7 must be derated from its 500 mW maximum. Per Figure 1 in DS30024 Rev. C-2, power dissipation drops to approximately 350 mW at 70°C. This is calculated using the 300 °C/W thermal resistance and the 175°C maximum junction temperature limit: PD = (TJMAX − TA) / RJA = (175 − 70) / 300 ≈ 0.35 W.
Does ZMM5242B-7 have a specified junction capacitance?
No, the official datasheet DS30024 Rev. C-2 does not list a measured or typical junction capacitance value for ZMM5242B-7. Figure 2 shows junction capacitance vs. zener voltage for the full ZMM52xxB family, but no discrete point is given for 12 V; interpolation suggests ~12–15 pF at VR = 2.0 V, but this is not guaranteed or characterized for this specific part.
Can ZMM5242B-7 be used in forward conduction mode?
Yes - the datasheet specifies forward voltage VF = 1.5 V at IF = 200 mA. This makes it usable as a low-drop rectifier or polarity protection diode, though its 500 mW rating limits average forward current to ~330 mA at 1.5 V (assuming no additional thermal resistance), and it lacks fast-recovery or Schottky characteristics.
Is ZMM5242B-7 compliant with RoHS and REACH?
Yes - Diodes Incorporated confirms ZMM5242B-7 meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. The MiniMELF glass package contains no lead in solderable terminations, and material declarations are available via Diodes' compliance portal under document number DIO-0000000127.
ZMM5242B-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):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 9.1 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
ZMM5242B-7 FAQ
1.How can I place an order for ZMM5242B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZMM5242B-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 ZMM5242B-7 reliable?
The price and inventory of ZMM5242B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMM5242B-7 is usually 5 days.
3.What payment methods are accepted for ZMM5242B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMM5242B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZMM5242B-7?
ZMM5242B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZMM5242B-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 ZMM5242B-7?
For technical support, including ZMM5242B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMM5242B-7 requirements.
6.How does Aetrix verify that ZMM5242B-7 is sourced from the original manufacturer or authorized distributors?
All ZMM5242B-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 ZMM5242B-7 meets industry standards.
7.What is the process for return or replacement of ZMM5242B-7?
All ZMM5242B-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZMM5242B-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 ZMM5242B-7 part is unused and in its original packaging.
Return procedure for ZMM5242B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZMM5242B-7 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
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…
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…
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…
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…
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…
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.
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.…
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…
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…
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…
