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Diodes Incorporated ZMM5262B-7
- Part No.:
- ZMM5262B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
ZMM5262B-7.pdf
- Description:
- DIODE ZENER 51V 500MW MINI MELF
- Quantity:
- Payment:
- Shipping:
Inventory:11,052
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Product details
Overview
ZMM5262B-7 from Diodes Incorporated is a 51 V, ±5% tolerance, 500 mW surface-mount Zener diode in MiniMELF (DO-213AA) glass package, optimized for voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and precision biasing networks operating up to +175°C ambient.
For engineers reviewing the ZMM5262B-7 datasheet, ZMM5262B-7 pinout, ZMM5262B-7 application, or ZMM5262B-7 equivalent, key selection criteria include its 2.5 mA zener test current, 125 Ω maximum zener impedance at IZT, +0.096 %/°C temperature coefficient, 0.1 µA maximum reverse leakage at rated voltage, and MiniMELF thermal resistance of 300 °C/W - all critical for stable low-power voltage reference design.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 51 V at 2.5 mA test current, exhibiting a positive temperature coefficient (+0.096 %/°C) that ensures predictable drift across industrial temperature ranges. Its 500 mW power rating is derated linearly above 50°C ambient per the published PD vs TA curve.
The device uses a hermetically sealed glass MiniMELF package with Sn97.5Ag2.5 terminations, enabling high-temperature solderability and moisture resistance (J-STD-020C Level 1). Junction capacitance is ~2.5 pF at 0 V bias, supporting moderate-frequency regulation without significant phase shift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V nominal, 48.45–53.55 V range at IZT = 2.5 mA - defines regulation setpoint with ±5% initial tolerance. |
| Zener Impedance (ZZT) | 1100 Ω max at IZT = 2.5 mA - limits output voltage variation under load transients. |
| Reverse Leakage (IR) | 0.1 µA max at VR = 39 V - ensures minimal quiescent current in high-impedance reference paths. |
| Power Dissipation (PD) | 500 mW at TA = 25°C, derated to zero at 150°C - sets maximum continuous dissipation in PCB-mounted operation. |
| Temp. Coefficient (αVZ) | +0.096 %/°C - enables predictable, monotonic VZ increase with junction temperature for thermal compensation. |
| Package | MiniMELF (DO-213AA), 3.3–3.7 mm length × 1.3–1.6 mm diameter - supports automated placement and high thermal reliability in compact layouts. |
Pinout & Package
MiniMELF package: cylindrical glass body with axial cathode band marking; two terminals - anode (unmarked end) and cathode (band-marked end). No internal leads; terminals are metallized ends of the semiconductor die.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node in shunt regulator configuration | Connected to system ground or lowest potential point; carries full load current when regulating. |
| Cathode | Regulated output node in shunt regulator configuration | Connected to input rail via current-limiting resistor; maintains stable 51 V relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass encapsulation | Enables operation up to +175°C junction temperature and eliminates moisture-induced parameter drift. |
| RoHS-compliant Sn97.5Ag2.5 termination | Supports lead-free reflow profiles (up to 260°C peak) without solder joint degradation or dewetting. |
| Low reverse leakage (0.1 µA @ 39 V) | Minimizes error in high-impedance voltage divider or op-amp reference circuits. |
| Stable +0.096 %/°C tempco | Allows predictable thermal compensation in precision analog systems without external circuitry. |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Biasing |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 51 V threshold to TL431-like control IC or discrete comparator. Use Value: Maintains ±1% output regulation across line/load/temperature with minimal component count and no active bias network. |
Use Scenario: Providing stable excitation voltage to RTD or strain gauge bridges in process instrumentation. IC Role / Device Role / Timing Role: Low-drift voltage reference source for ratiometric measurement front-ends. Use Value: Delivers <10 ppm/°C effective reference stability when combined with matched resistors, meeting Class A sensor accuracy requirements. |
| Overvoltage Clamp Protection | Microcontroller Reset Circuit |
Use Scenario: Protecting 48 V DC input rails against transient surges in telecom power systems. IC Role / Device Role / Timing Role: Clamping element placed across rail-to-ground, triggered above 53.55 V. Use Value: Limits peak voltage to safe levels for downstream MOSFETs and controllers without crowbar action or latch-up. |
Use Scenario: Generating a clean reset signal for ARM Cortex-M microcontrollers during brown-out conditions. IC Role / Device Role / Timing Role: Reference element in RC-delayed reset generator with hysteresis. Use Value: Ensures deterministic reset assertion at 48.45 V, preventing erratic boot behavior during gradual 48 V rail collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5262T1G | Same 51 V rating but SOD-123 plastic package; 350 mW PD; 150 Ω ZZT; +0.096 %/°C tempco. | Lower thermal resistance (250 °C/W) but reduced max Tj (150°C); unsuitable for >125°C ambient. | Select for cost-sensitive, space-constrained PCBs where full industrial temperature range is not required. |
| BZX55C51 | 51 V, ±5%, DO-35 glass package; 500 mW; 130 Ω ZZT; +0.09 %/°C; 0.1 µA IR. | Larger DO-35 footprint; higher mechanical robustness but lower placement density than MiniMELF. | Select when legacy through-hole compatibility or manual repairability is prioritized over automated assembly efficiency. |
Compared with ZMM5262B-7, MMSZ5262T1G offers better zener impedance and smaller footprint but sacrifices high-temperature capability, while BZX55C51 retains identical thermal performance but requires larger board area and lacks RoHS-compliant terminations.
Availability
ZMM5262B-7 is available at Aetrix Electronics and suitable for switch-mode power supply feedback, industrial sensor biasing, overvoltage clamp protection, and microcontroller reset circuits requiring stable component supply with guaranteed long-term sourcing.
Supply support for ZMM5262B-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' legacy Zener diode product line, engineered specifically for high-reliability voltage reference and regulation in industrial, automotive, and telecom infrastructure applications demanding extended temperature operation and hermetic stability.
FAQ
What is the maximum continuous power dissipation for ZMM5262B-7 at 70°C ambient?
At 70°C ambient, ZMM5262B-7's power dissipation must be derated linearly from 500 mW at 25°C using its 300 °C/W thermal resistance. The allowable PD is 500 mW × (1 − (70 − 25)/150) = 350 mW, verified by the published PD vs TA curve on page 1 of DS30024 Rev. 5.
Is ZMM5262B-7 suitable for use in reflow soldering processes?
Yes - ZMM5262B-7 features Sn97.5Ag2.5 terminations qualified per MIL-STD-202, Method 208, and supports standard lead-free reflow profiles with peak temperatures up to 260°C, as confirmed in the "Terminals" section of the datasheet.
How does the +0.096 %/°C temperature coefficient affect regulation accuracy over −40°C to +125°C?
Across −40°C to +125°C, the zener voltage shifts by +0.096 %/°C × 165°C = +15.84%, or approximately +8.1 V from 51 V nominal. This drift is predictable and can be compensated in closed-loop systems, but makes it unsuitable for standalone precision references without calibration.
Why is ZMM5262B-7 marked as "Not Recommended for New Design"?
Diodes Incorporated recommends MMSZ52xx series as replacements due to improved manufacturability, tighter ZZT distribution, and better SMT placement yield - not due to performance deficiency. ZMM5262B-7 remains fully functional and supported for existing designs and legacy repairs.
ZMM5262B-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):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 125 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 39 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
ZMM5262B-7 FAQ
1.How can I place an order for ZMM5262B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZMM5262B-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 ZMM5262B-7 reliable?
The price and inventory of ZMM5262B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMM5262B-7 is usually 5 days.
3.What payment methods are accepted for ZMM5262B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMM5262B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZMM5262B-7?
ZMM5262B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZMM5262B-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 ZMM5262B-7?
For technical support, including ZMM5262B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMM5262B-7 requirements.
6.How does Aetrix verify that ZMM5262B-7 is sourced from the original manufacturer or authorized distributors?
All ZMM5262B-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 ZMM5262B-7 meets industry standards.
7.What is the process for return or replacement of ZMM5262B-7?
All ZMM5262B-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZMM5262B-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 ZMM5262B-7 part is unused and in its original packaging.
Return procedure for ZMM5262B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZMM5262B-7 Tags
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