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Diodes Incorporated ZMM5259B-7
- Part No.:
- ZMM5259B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
ZMM5259B-7.pdf
- Description:
- DIODE ZENER 39V 500MW MINI MELF
- Quantity:
- Payment:
- Shipping:
Inventory:8,373
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Product details
Overview
ZMM5259B-7 from Diodes Incorporated is a 39 V, 500 mW surface-mount Zener diode in MiniMELF (DO-213AA) glass package, with 3.2 mA test current, 80 Ω maximum dynamic impedance at IZT, and +0.094 %/°C temperature coefficient. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the ZMM5259B-7 datasheet, ZMM5259B-7 pinout, ZMM5259B-7 application, or ZMM5259B-7 equivalent, key selection criteria include zener voltage tolerance (±2.5%), thermal resistance (300 °C/W), reverse leakage (≤0.1 µA at 30 V), cathode-band polarity marking, and MiniMELF mechanical compatibility with automated SMT placement.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its hemispheric glass MiniMELF package ensures hermetic sealing and reliable thermal performance up to +175 °C junction temperature.
The device is characterized at 25 °C with 100 ms pulse testing per JEDEC standards; its +0.094 %/°C temperature coefficient enables predictable drift compensation in voltage references, while 80 Ω dynamic impedance at 3.2 mA supports stable regulation in low-current bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal, 37.05–40.95 V range at 3.2 mA - defines regulated output voltage tolerance for reference design |
| Power Dissipation (Pd) | 500 mW - sets maximum continuous power handling in ambient air without heatsinking |
| Zener Impedance (ZZT) | 80 Ω max at IZT = 3.2 mA - determines output voltage stability under small-signal load variation |
| Reverse Leakage (IR) | ≤0.1 µA at VR = 30 V - ensures minimal quiescent current in standby protection circuits |
| Temp Coefficient (TC) | +0.094 %/°C - quantifies voltage drift per degree Celsius for temperature-compensated designs |
| Thermal Resistance (RJA) | 300 °C/W - indicates junction-to-ambient thermal rise per watt, critical for derating above 25 °C |
| Package | MiniMELF (DO-213AA) - 3.3–3.7 mm length, 1.3–1.6 mm diameter glass body compatible with standard SMT reflow profiles |
Pinout & Package
MiniMELF package with axial cathode-band marking; two-terminal device with no internal leads - anode and cathode defined by band orientation. Solderable per MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Breakdown terminal | Connected to higher potential in reverse-bias regulation; voltage clamping occurs here during overvoltage events |
| Anode (unmarked end) | Reference terminal | Typically tied to ground or lower-potential node; establishes reference point for regulated output |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass construction | Ensures long-term parameter stability and moisture resistance in industrial environments |
| Low leakage current | 0.1 µA max at 30 V enables ultra-low-power voltage monitoring in battery-backed systems |
| Precision voltage tolerance | ±2.5% (37.05–40.95 V) supports accurate analog reference generation without trimming |
| High-temperature operation | Rated from –65 °C to +175 °C junction temperature for automotive under-hood and industrial control use |
| Standard MiniMELF footprint | Enables drop-in replacement and compatibility with existing DO-213AA pick-and-place tooling |
Applications
| Industrial Sensor Reference | USB Port Overvoltage Clamp |
|---|---|
Use Scenario: Stable 39 V reference for 4–20 mA transmitter calibration circuitry operating in factory-floor enclosures. IC Role / Device Role / Timing Role: Zener diode providing fixed reference voltage for DAC output scaling and op-amp biasing. Use Value: ±2.5% tolerance and +0.094 %/°C TC enable <±0.5% total error over –40 to +85 °C ambient range. | Use Scenario: Secondary overvoltage protection on 5 V USB VBUS line against transient surges beyond primary TVS rating. IC Role / Device Role / Timing Role: Standby-clamp Zener limiting voltage to 39 V during 100 ns–1 µs transients. Use Value: 500 mW power rating and 80 Ω impedance allow safe dissipation of 10–20 A surge currents when used with series impedance. |
| Programmable Logic Supply Clamp | Automotive ECU Voltage Monitor |
Use Scenario: Clamp on 3.3 V FPGA I/O bank supply to prevent latch-up during hot-swap events. IC Role / Device Role / Timing Role: Low-leakage (≤0.1 µA) Zener shunting excess voltage only above 39 V threshold. Use Value: Minimal standby current preserves system-level power budget while enabling fail-safe shutdown signaling. | Use Scenario: Monitoring 12 V vehicle battery rail for undervoltage/overvoltage alarms in engine control units. IC Role / Device Role / Timing Role: Precision Zener referenced to microcontroller ADC input via resistive divider. Use Value: Hermetic MiniMELF package withstands under-hood thermal cycling; ±2.5% VZ ensures alarm thresholds remain within ASIL-B tolerances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C39-TR | 39 V, ±5% tolerance, 500 mW, DO-35 package - wider voltage spread and axial leaded form factor | Requires through-hole assembly; less suitable for high-density SMT layouts | Select when legacy board design mandates axial leads or cost sensitivity outweighs precision needs |
| MMSZ5259ET1G | 39 V, ±5%, 500 mW, SOD-123 - smaller footprint but 100 Ω ZZT and +0.09 %/°C TC | Higher dynamic impedance reduces regulation accuracy in low-noise references | Prefer for space-constrained consumer PCBs where ±5% tolerance is acceptable |
Compared with BZX55C39-TR and MMSZ5259ET1G, ZMM5259B-7 delivers tighter ±2.5% voltage tolerance and lower 80 Ω impedance in a robust MiniMELF package-making it optimal for industrial reference and high-reliability clamp applications where parameter stability is critical.
Availability
ZMM5259B-7 is available at Aetrix Electronics and suitable for industrial sensor reference, USB port overvoltage clamp, and automotive ECU voltage monitor applications requiring stable component supply and long-term parametric consistency.
Supply support for ZMM5259B-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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with manufacturing and design centers across Asia, the US, and Europe.
ZMM52xxB series belongs to Diodes' precision Zener diode product line, engineered for stable voltage regulation and reference applications in industrial, automotive, and communications equipment where reliability and tight tolerance matter.
FAQ
What is the maximum reverse voltage before breakdown for ZMM5259B-7?
The ZMM5259B-7 is rated for nominal 39 V Zener voltage at 3.2 mA test current, with guaranteed breakdown occurring between 37.05 V and 40.95 V. It is not designed to block voltages above this range continuously - sustained reverse voltage >40.95 V may cause thermal runaway if power dissipation exceeds 500 mW.
Can ZMM5259B-7 be used in place of a 36 V Zener diode?
No - ZMM5259B-7 is specifically a 39 V device (37.05–40.95 V range). Substituting it for a 36 V Zener would raise the regulation threshold by ~3 V, potentially causing overvoltage stress in downstream circuitry. Use ZMM5258B (36 V) instead for that voltage level.
Is the MiniMELF package RoHS-compliant and lead-free?
Yes - ZMM5259B-7 meets RoHS Directive 2011/65/EU and is manufactured with lead-free terminations. The glass body contains no restricted substances, and solderability is validated per MIL-STD-202, Method 208 using Pb-free reflow profiles.
How does temperature affect ZMM5259B-7's regulation voltage?
ZMM5259B-7 exhibits a +0.094 %/°C temperature coefficient, meaning its Zener voltage increases by approximately 36.7 mV per °C rise above 25 °C. At 100 °C junction temperature, VZ rises by ~7.1 V - a critical factor in high-ambient designs requiring derating or compensation.
ZMM5259B-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):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 30 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
ZMM5259B-7 FAQ
1.How can I place an order for ZMM5259B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZMM5259B-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 ZMM5259B-7 reliable?
The price and inventory of ZMM5259B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMM5259B-7 is usually 5 days.
3.What payment methods are accepted for ZMM5259B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMM5259B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZMM5259B-7?
ZMM5259B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZMM5259B-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 ZMM5259B-7?
For technical support, including ZMM5259B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMM5259B-7 requirements.
6.How does Aetrix verify that ZMM5259B-7 is sourced from the original manufacturer or authorized distributors?
All ZMM5259B-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 ZMM5259B-7 meets industry standards.
7.What is the process for return or replacement of ZMM5259B-7?
All ZMM5259B-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZMM5259B-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 ZMM5259B-7 part is unused and in its original packaging.
Return procedure for ZMM5259B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZMM5259B-7 Tags
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