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Diodes Incorporated ZMM5231B-7
- Part No.:
- ZMM5231B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
ZMM5231B-7.pdf
- Description:
- DIODE ZENER 5.1V 500MW MINI MELF
- Quantity:
- Payment:
- Shipping:
Inventory:2,704
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Product details
Overview
ZMM5231B-7 from Diodes Incorporated is a 500mW surface-mount Zener diode with nominal zener voltage of 5.1V (4.85–5.36V range), 17Ω dynamic impedance at 20mA test current, and ±0.030%/°C temperature coefficient. It uses a MiniMELF glass package for stable voltage reference in low-power analog circuits, including power supply feedback loops and overvoltage protection in industrial sensor interfaces.
For engineers reviewing the ZMM5231B-7 datasheet, ZMM5231B-7 pinout, ZMM5231B-7 application, or ZMM5231B-7 equivalent, key selection criteria include its 5.1V regulation tolerance, 17Ω zener impedance, -65°C to +175°C operating range, MiniMELF mechanical compatibility, and thermal resistance of 300°C/W under ambient-sink conditions.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable DC voltage across its terminals under varying load and input conditions. Its 5.1V nominal zener voltage is specified at 20mA test current (IZT), with 1600Ω maximum knee impedance (ZZK) at 0.25mA and 5.0µA maximum reverse leakage (IR) at rated voltage (VR).
The device exhibits a positive temperature coefficient of +0.030%/°C, indicating voltage increases slightly with rising junction temperature - critical for precision biasing where thermal drift must be modeled. Its hemispherical glass MiniMELF package enables high reliability in reflow-soldered PCB assemblies with minimal parasitic capacitance (≈15pF at 2V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal VZ | 5.1 V - stable regulation point for 5V rail monitoring and clamping |
| VZ Range | 4.85–5.36 V - ensures functional compliance across manufacturing lot variation |
| IZT | 20 mA - standard test current defining zener voltage and impedance |
| ZZT @ IZT | 17 Ω - low dynamic impedance supports tight regulation under dynamic load changes |
| IR @ VR | 5.0 µA - low leakage preserves accuracy in high-impedance reference nodes |
| Temp Coeff | +0.030 %/°C - predictable voltage rise with temperature, usable in compensated designs |
| Pd | 500 mW - maximum continuous dissipation at 25°C ambient, derates linearly above |
Pinout & Package
Package: MiniMELF (DO-213AA), hermetically sealed glass cylindrical body with cathode band marking. Dimensions: A = 3.30–3.70 mm (length), B = 1.30–1.60 mm (diameter), C = 0.28–0.50 mm (lead diameter). Solderable per MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference node | Connected to lower-potential side in shunt regulator configuration |
| Cathode | Zener voltage reference terminal / Breakdown anode | Marked with band; connected to regulated output node in feedback paths |
Key Features
| Feature | Design Value |
|---|---|
| Stable 5.1V regulation | Enables accurate 5V rail sensing without external trimming resistors |
| Low ZZT (17Ω) | Minimizes output voltage deviation under 10–30mA load transients |
| Wide temp range (-65°C to +175°C) | Supports operation in automotive engine compartments and industrial enclosures |
| MiniMELF glass package | Provides hermetic sealing and low parasitic capacitance (<20pF) for RF-adjacent analog stages |
Applications
| Power Supply Feedback | Sensor Signal Clamping |
|---|---|
Use Scenario: Shunt regulation in isolated flyback converter feedback circuit using optocoupler. IC Role / Device Role / Timing Role: Zener reference providing precise 5.1V threshold to TL431-like comparator input. Use Value: Maintains ±2% output voltage accuracy across line/load/temperature with no active components. | Use Scenario: Protecting ADC input of industrial temperature sensor against ESD-induced overvoltage. IC Role / Device Role / Timing Role: Passive clamp limiting input to 5.1V ±0.25V during transient events. Use Value: Prevents ADC saturation and latch-up while adding <1ns delay due to low junction capacitance. |
| Microcontroller Reset Circuit | Reference Voltage Divider |
Use Scenario: Generating clean 5.1V reset threshold for 5V microcontrollers in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Zener-based threshold detector feeding RC delay network to reset pin. Use Value: Ensures reliable reset assertion below 4.85V with immunity to supply ripple up to 100mVpp. | Use Scenario: Creating stable mid-rail reference (2.55V) via resistor divider from 5.1V Zener source. IC Role / Device Role / Timing Role: Low-drift voltage source enabling matched 1% resistor networks. Use Value: Delivers <10ppm/°C effective reference drift when paired with metal-film dividers. |
Availability
ZMM5231B-7 is available at Aetrix Electronics and suitable for power supply feedback, sensor signal clamping, microcontroller reset circuits, and reference voltage divider applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ZMM5231B-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' surface-mount Zener diode product line, engineered for high-reliability voltage regulation and protection in space-constrained, thermally demanding environments.
FAQ
What is the maximum power dissipation of ZMM5231B-7 at 70°C ambient?
At 70°C ambient, ZMM5231B-7's maximum power dissipation is 350mW. This is derived from its 500mW rating at 25°C and 300°C/W thermal resistance: derating slope is 1.67mW/°C, so 500 − (70−25) × 1.67 ≈ 350mW. Operation beyond this risks thermal runaway.
Is ZMM5231B-7 compatible with lead-free reflow soldering profiles?
Yes, ZMM5231B-7 is qualified for lead-free reflow per JEDEC J-STD-020. Its MiniMELF glass package withstands peak temperatures up to 260°C for 10 seconds. Preheat and soak profiles must limit thermal shock; ramp rates should not exceed 3°C/s to prevent glass cracking.
How does the +0.030%/°C temperature coefficient affect regulation accuracy over -40°C to +85°C?
Over -40°C to +85°C, the total zener voltage shift is approximately +3.75mV/°C × 125°C = +469mV, or +9.2% of nominal 5.1V. This means VZ shifts from ~4.63V at -40°C to ~5.57V at +85°C - acceptable for non-precision applications but requires compensation in metrology-grade designs.
Can ZMM5231B-7 replace a 1N4733A in existing designs?
ZMM5231B-7 is functionally equivalent to 1N4733A (5.1V Zener), but differs in package (MiniMELF vs DO-41) and thermal performance (300°C/W vs ~500°C/W). PCB footprint and soldering process must be revised; electrical behavior is nearly identical at 20mA, though ZZT is 17Ω vs 19Ω.
ZMM5231B-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):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 2 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
ZMM5231B-7 FAQ
1.How can I place an order for ZMM5231B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZMM5231B-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 ZMM5231B-7 reliable?
The price and inventory of ZMM5231B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMM5231B-7 is usually 5 days.
3.What payment methods are accepted for ZMM5231B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMM5231B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZMM5231B-7?
ZMM5231B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZMM5231B-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 ZMM5231B-7?
For technical support, including ZMM5231B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMM5231B-7 requirements.
6.How does Aetrix verify that ZMM5231B-7 is sourced from the original manufacturer or authorized distributors?
All ZMM5231B-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 ZMM5231B-7 meets industry standards.
7.What is the process for return or replacement of ZMM5231B-7?
All ZMM5231B-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZMM5231B-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 ZMM5231B-7 part is unused and in its original packaging.
Return procedure for ZMM5231B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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