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Diodes Incorporated ZMM5236B-7
- Part No.:
- ZMM5236B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
ZMM5236B-7.pdf
- Description:
- DIODE ZENER 7.5V 500MW MINI MELF
- Quantity:
- Payment:
- Shipping:
Inventory:7,268
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Product details
Overview
ZMM5236B-7 from Diodes Incorporated is a 500mW surface-mount Zener diode with a nominal zener voltage of 7.5V (min 7.13V, max 7.88V at 20mA), 6.0Ω dynamic impedance at 20mA, and +0.058%/°C temperature coefficient - used for precision voltage regulation and reference in low-power analog circuits, such as sensor biasing and ADC reference stabilization.
For engineers reviewing the ZMM5236B-7 datasheet, ZMM5236B-7 pinout, ZMM5236B-7 application, or ZMM5236B-7 equivalent, this device requires attention to its MiniMELF glass package thermal limits (RJA = 300°C/W), cathode-band polarity marking, and replacement guidance due to its "Not Recommended for New Design" status per Diodes Incorporated.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled voltage tolerance (±5% at IZT = 20mA) and low dynamic impedance (6.0Ω), enabling stable DC reference generation under varying load conditions. Its +0.058%/°C temperature coefficient ensures predictable drift over -65°C to +175°C operating range.
The MiniMELF glass package provides hermetic sealing and high-temperature reliability, with Sn97.5Ag2.5 terminations meeting MIL-STD-202 solderability requirements. It is rated for 500mW power dissipation at 25°C ambient, derating linearly above 25°C per the published curve (Fig.1).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V nominal, 7.13–7.88 V range at 20 mA - defines regulated output voltage under design current. |
| Zener Impedance (ZZT) | 6.0 Ω at 20 mA - determines output voltage stability against load current changes. |
| Power Dissipation (PD) | 500 mW at TA = 25°C - sets maximum continuous power before thermal derating applies. |
| Temperature Coefficient | +0.058 %/°C - quantifies voltage drift per degree Celsius rise, critical for temperature-sensitive references. |
| Reverse Leakage (IR) | 3.0 µA at VR = 6.0 V - specifies off-state current that affects high-impedance node accuracy. |
| Junction-to-Ambient RJA | 300 °C/W - defines thermal resistance limiting safe power handling in still-air PCB mounting. |
Pinout & Package
MiniMELF (DO-213AA) glass package: cylindrical, 3.3–3.7 mm length, 1.3–1.6 mm diameter, cathode band marking. Two-terminal device: anode and cathode; polarity identified by single black band on cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased terminal | Connected to higher potential in regulation configuration; voltage referenced to this node. |
| Anode (unbanded end) | Reference/ground terminal | Typically tied to system ground or lower-potential rail; completes Zener conduction path. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic Glass Encapsulation | Ensures long-term parameter stability and moisture resistance in harsh environments. |
| RoHS-Compliant Lead Finish | Sn97.5Ag2.5 termination supports lead-free reflow while maintaining solder joint reliability. |
| Tight Zener Voltage Tolerance | ±5% at 20 mA enables use in applications requiring better than ±1% reference accuracy without trimming. |
| Low-Temperature-Coefficient Drift | +0.058%/°C minimizes error contribution in industrial temperature ranges (−40°C to +85°C). |
Applications
| ADC Reference Stabilization | Sensor Biasing Circuit |
|---|---|
Use Scenario: Providing stable 7.5V reference to 12-bit SAR ADCs in portable instrumentation. IC Role / Device Role / Timing Role: Zener diode acts as shunt voltage reference, regulating input to ADC's internal reference buffer. Use Value: Maintains <±0.5 LSB error across temperature due to low ZZT and predictable TC. |
Use Scenario: Supplying precise bias voltage to silicon pressure sensors in automotive HVAC modules. IC Role / Device Role / Timing Role: Functions as passive voltage clamp and reference source for Wheatstone bridge excitation. Use Value: Enables <±0.25% full-scale output consistency over −40°C to +125°C ambient. |
| Overvoltage Clamp Protection | Low-Power Microcontroller Reset Circuit |
Use Scenario: Clamping 12V supply rail transients to protect downstream 5V logic in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Shunt limiter activated during >7.88V overvoltage events, diverting surge current. Use Value: Limits clamped voltage to ≤8.0V with <100ns response, preventing latch-up in connected ICs. |
Use Scenario: Generating clean 7.5V reset threshold for 3.3V microcontrollers using external supervisor ICs. IC Role / Device Role / Timing Role: Supplies accurate trigger voltage to reset supervisor (e.g., APX803) with hysteresis. Use Value: Ensures reset assertion within ±1.5% tolerance across battery voltage decay (3.0–4.2V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5236B-7 | Same 7.5V rating, SOD-123 plastic package, 300mW PD, RJA = 350°C/W, +0.058%/°C TC. | Higher thermal resistance limits power handling in compact layouts; less suitable for high-reliability sealed environments. | Preferred for cost-sensitive, high-volume consumer designs where hermeticity is not required. |
| BZX584C7V5 | 7.5V, SOD-523 package, 300mW, RJA = 450°C/W, ±5% tolerance, TC = +0.05%/°C. | Smaller footprint but significantly higher thermal resistance and lower surge capability. | Applicable only in space-constrained, low-power (<100mW avg) applications with active cooling. |
Compared with ZMM5236B-7, MMSZ5236B-7 trades hermetic reliability for lower cost and wider availability, while BZX584C7V5 sacrifices thermal robustness and surge margin for ultra-small size - making the ZMM5236B-7 optimal for legacy industrial systems demanding long-term parameter stability.
Availability
ZMM5236B-7 is available at Aetrix Electronics and suitable for voltage reference stabilization, sensor excitation, overvoltage clamping, and microcontroller reset circuitry requiring stable component supply across extended temperature and lifecycle demands.
Supply support for ZMM5236B-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, specializing in high-reliability protection, signal integrity, and power management solutions.
ZMM52xx series belongs to Diodes' legacy Zener diode product line, designed specifically for precision voltage reference and regulation in industrial, automotive, and telecom infrastructure where long-term parametric stability and hermetic packaging are essential.
FAQ
Is ZMM5236B-7 RoHS compliant?
Yes, ZMM5236B-7 features a lead-free Sn97.5Ag2.5 termination and complies with EU Directive 2002/95/EC (RoHS), including exemptions for high-temperature solder and glass encapsulation as specified in Annex Notes 5 and 7.
Why is ZMM5236B-7 marked "Not Recommended for New Design"?
Diodes Incorporated designates ZMM5236B-7 as "Not Recommended for New Design" due to obsolescence planning for the MiniMELF glass package; the MMSZ52xx series in SOD-123 offers equivalent electrical performance with improved manufacturability and supply chain scalability.
What is the maximum allowable reverse current before breakdown?
ZMM5236B-7 exhibits 3.0 µA reverse leakage at 6.0 V (VR), well below its 20 mA test current; breakdown is defined at VZ = 7.13 V minimum, so operation below 7.13 V remains in non-conductive region with negligible current.
Can ZMM5236B-7 be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances; paralleling causes current hogging and thermal runaway. For higher power, use a single higher-rated Zener or active regulation instead.
ZMM5236B-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):
- 7.5 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 6 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 6 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
ZMM5236B-7 FAQ
1.How can I place an order for ZMM5236B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZMM5236B-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 ZMM5236B-7 reliable?
The price and inventory of ZMM5236B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMM5236B-7 is usually 5 days.
3.What payment methods are accepted for ZMM5236B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMM5236B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZMM5236B-7?
ZMM5236B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZMM5236B-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 ZMM5236B-7?
For technical support, including ZMM5236B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMM5236B-7 requirements.
6.How does Aetrix verify that ZMM5236B-7 is sourced from the original manufacturer or authorized distributors?
All ZMM5236B-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 ZMM5236B-7 meets industry standards.
7.What is the process for return or replacement of ZMM5236B-7?
All ZMM5236B-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZMM5236B-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 ZMM5236B-7 part is unused and in its original packaging.
Return procedure for ZMM5236B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZMM5236B-7 Tags
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