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Diodes Incorporated ZMM5256B-7
- Part No.:
- ZMM5256B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
ZMM5256B-7.pdf
- Description:
- DIODE ZENER 30V 500MW MINI MELF
- Quantity:
- Payment:
- Shipping:
Inventory:5,144
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Product details
Overview
ZMM5256B-7 from Diodes Incorporated is a 30 V, 500 mW surface-mount Zener diode in MiniMELF (DO-213AA) glass package, designed for precision voltage regulation and reference applications at 4.2 mA test current. It exhibits 600 Ω maximum zener impedance at 1 mA, 0.1 µA maximum reverse leakage at 23 V, and +0.091 %/°C temperature coefficient. Used in power supply feedback loops and analog sensor biasing circuits.
For engineers reviewing the ZMM5256B-7 datasheet, ZMM5256B-7 pinout, ZMM5256B-7 application, or ZMM5256B-7 equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (300 °C/W), junction capacitance (~2.5 pF at 2 V), and compatibility with high-temperature soldering per MIL-STD-202.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its 30 V nominal zener voltage is specified at IZT = 4.2 mA with ±5% tolerance (28.5–31.5 V), and it delivers predictable regulation down to 0.25 mA knee current.
The device uses a hemispheric glass MiniMELF package enabling low-profile mounting and reliable hermetic sealing. Its temperature coefficient of +0.091 %/°C indicates positive drift above 25 °C, requiring compensation in precision references where ambient variation exceeds ±10 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30 V nominal, 28.5–31.5 V range at 4.2 mA - defines regulated output level in shunt regulator designs |
| Power Dissipation (PD) | 500 mW at 25 °C ambient - limits continuous current to ~16.7 mA at 30 V without derating |
| Zener Impedance (ZZT) | 600 Ω max at 1 mA - determines regulation stiffness and AC ripple rejection in feedback paths |
| Reverse Leakage (IR) | 0.1 µA max at 23 V - ensures minimal error current in high-impedance reference nodes |
| Temp Coefficient (TC) | +0.091 %/°C - quantifies voltage drift per degree; requires thermal layout mitigation above 50 °C |
| Junction Capacitance (CJ) | ~2.5 pF at 2 V - impacts high-frequency noise filtering and stability in op-amp reference circuits |
Pinout & Package
MiniMELF (DO-213AA) glass package: cylindrical, 3.3–3.7 mm length × 1.3–1.6 mm diameter, cathode band marking. Hermetically sealed, RoHS-compliant Sn97.5Ag2.5 termination, moisture sensitivity Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to ground or common return in shunt regulator configurations |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 30 V reference when reverse-biased; marked with band |
Key Features
| Feature | Design Value |
|---|---|
| Stable 30 V regulation | ±5% tolerance over 4.2 mA test current enables accurate feedback in DC-DC converters |
| Low leakage current | 0.1 µA max at 23 V supports high-impedance voltage divider networks without loading error |
| MiniMELF packaging | DO-213AA outline allows 0.034 g weight and 300 °C/W thermal resistance for compact PCB layouts |
| High-temp reliability | -65 to +175 °C operating range supports automotive under-hood and industrial control environments |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Biasing |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener diode provides precise 30 V reference for TL431-like comparator input or direct optocoupler LED biasing. Use Value: Tight 28.5–31.5 V tolerance ensures ±1.5% output regulation accuracy without trimming. |
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in PLC analog input modules. IC Role / Device Role / Timing Role: Acts as low-drift voltage reference for Wheatstone bridge biasing in 4–20 mA transmitter front-ends. Use Value: +0.091 %/°C TC and 0.1 µA leakage minimize measurement drift across -40 to +85 °C industrial range. |
| Overvoltage Protection Clamp | ADC Reference Stabilization |
Use Scenario: Clamping transient surges on 24 V industrial I/O lines to protect downstream logic inputs. IC Role / Device Role / Timing Role: Shunt clamping element that conducts above 31.5 V to divert surge energy to ground. Use Value: 500 mW rating sustains 100 ms pulses up to 16.7 mA, compatible with IEC 61000-4-5 Level 3 testing. |
Use Scenario: Stabilizing reference voltage for 12-bit SAR ADCs in battery-powered data loggers. IC Role / Device Role / Timing Role: Low-capacitance (2.5 pF) Zener supplies clean 30 V to external voltage divider feeding ADC REF pin. Use Value: Minimal junction capacitance avoids high-frequency coupling into sensitive analog reference paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5256ET1G | Same 30 V rating, SOD-123 package, 300 mW PD, 1000 Ω ZZT max at 1 mA | Lower power and higher impedance reduce regulation accuracy in precision feedback loops | Select for space-constrained boards where MiniMELF height is prohibitive and ±10% regulation suffices |
| BZX55C30 | 30 V, DO-35 glass package, 500 mW, 600 Ω ZZT, but -65 to +175 °C range limited to +150 °C max | Lower max junction temperature restricts use in high-ambient industrial enclosures | Prefer where legacy DO-35 footprint compatibility is required and thermal margin >25 °C exists |
Compared with ZMM5256B-7, MMSZ5256ET1G trades MiniMELF reliability and low ZZT for smaller footprint and lower cost, while BZX55C30 retains glass hermeticity but sacrifices 25 °C of operational headroom - making ZMM5256B-7 optimal for thermally demanding, high-stability applications.
Availability
ZMM5256B-7 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, overvoltage protection circuits, and precision ADC reference designs requiring stable component supply and long-term obsolescence management.
Supply support for ZMM5256B-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.
ZMM52xx series belongs to Diodes' standard Zener diode product line, engineered for general-purpose voltage regulation and reference in cost-sensitive, high-volume industrial and consumer power systems.
FAQ
What is the maximum continuous reverse current ZMM5256B-7 can sustain at 30 V?
ZMM5256B-7 is rated for 500 mW total power dissipation at 25 °C ambient. At 30 V, this corresponds to a maximum continuous reverse current of 16.7 mA before thermal derating applies. Above 25 °C, current must be reduced linearly per the 300 °C/W junction-to-ambient thermal resistance.
Is ZMM5256B-7 suitable for use in automotive applications?
ZMM5256B-7 operates from -65 to +175 °C and meets RoHS requirements, but it is not AEC-Q200 qualified. It may be used in non-safety-critical automotive subsystems like infotainment power rails or cabin sensors, provided full qualification testing is performed by the end customer.
How does the +0.091 %/°C temperature coefficient affect circuit accuracy?
A +0.091 %/°C coefficient means the zener voltage increases by 27.3 mV per 10 °C rise above 25 °C. Over a 50 °C ambient swing (e.g., 25–75 °C), this introduces ±136.5 mV drift - requiring compensation in sub-0.5% accuracy references, such as using matched resistor networks or digital calibration.
Can ZMM5256B-7 replace ZMM5256B-13 in the same PCB footprint?
Yes - both ZMM5256B-7 and ZMM5256B-13 share identical MiniMELF (DO-213AA) package dimensions and cathode band marking. The suffix denotes tape-and-reel packaging only: -7 = 2.5K/reel on 7-inch reel, -13 = 10K/reel on 13-inch reel. No layout or soldering changes are needed.
ZMM5256B-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):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 49 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 23 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
ZMM5256B-7 FAQ
1.How can I place an order for ZMM5256B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZMM5256B-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 ZMM5256B-7 reliable?
The price and inventory of ZMM5256B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMM5256B-7 is usually 5 days.
3.What payment methods are accepted for ZMM5256B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMM5256B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZMM5256B-7?
ZMM5256B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZMM5256B-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 ZMM5256B-7?
For technical support, including ZMM5256B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMM5256B-7 requirements.
6.How does Aetrix verify that ZMM5256B-7 is sourced from the original manufacturer or authorized distributors?
All ZMM5256B-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 ZMM5256B-7 meets industry standards.
7.What is the process for return or replacement of ZMM5256B-7?
All ZMM5256B-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZMM5256B-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 ZMM5256B-7 part is unused and in its original packaging.
Return procedure for ZMM5256B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZMM5256B-7 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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