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Diodes Incorporated ZMM5239B-7
- Part No.:
- ZMM5239B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-213AC, MINI-MELF, SOD-80
- Datasheet:
-
ZMM5239B-7.pdf
- Description:
- DIODE ZENER 9.1V 500MW MINI MELF
- Quantity:
- Payment:
- Shipping:
Inventory:4,193
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Product details
Overview
ZMM5239B-7 from Diodes Incorporated is a 500mW surface-mount Zener diode with a nominal zener voltage of 9.1V (8.65–9.56V range at 20mA), 10Ω maximum zener impedance at test current, and +0.068%/°C temperature coefficient. It uses a MiniMELF glass package for precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the ZMM5239B-7 datasheet, ZMM5239B-7 pinout, ZMM5239B-7 application, or ZMM5239B-7 equivalent, key selection criteria include its tight VZ tolerance, low dynamic impedance, stable TC, and MiniMELF thermal performance under continuous 500mW dissipation limits.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain a stable DC voltage across its terminals when biased above VZ with current ≥20mA. Its hemispherical glass MiniMELF package provides hermetic sealing and low thermal resistance (300°C/W junction-to-ambient).
The ZMM5239B-7 exhibits a positive temperature coefficient (+0.068%/°C), indicating increasing VZ with rising temperature - a critical factor in temperature-sensitive biasing and reference designs where drift compensation is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V nominal, 8.65–9.56 V min/max at IZT = 20 mA - defines regulated output voltage window under standard test conditions |
| Zener Impedance (ZZT) | ≤10 Ω at IZT = 20 mA - ensures minimal output voltage variation under load current changes |
| Power Dissipation (PD) | 500 mW - sets maximum continuous DC power handling in ambient air without heatsinking |
| Temperature Coefficient (TC) | +0.068 %/°C - quantifies VZ drift per degree Celsius rise, critical for thermal stability in precision references |
| Reverse Current (IR) | ≤3.0 µA at VR = 7.0 V - confirms low leakage below breakdown, preserving accuracy in high-impedance bias networks |
| Junction Capacitance (Cj) | ≈4 pF at VR = 2.0 V - impacts high-frequency noise rejection and AC coupling behavior in filtering applications |
Pinout & Package
Package: MiniMELF (DO-213AA), hermetically sealed glass cylindrical case 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). Weight ≈ 0.034 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node in shunt regulator | Connected to lower-potential side of circuit; establishes reference point for VZ measurement and current return path |
| Cathode | Reverse-biased breakdown terminal / Regulated output node | Connected to higher-potential side; delivers stable 9.1V reference when reverse-biased above VZ with ≥20mA current |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MiniMELF package | Enables long-term reliability and moisture resistance in industrial environments without conformal coating |
| Tight VZ tolerance (±5%) | Reduces binning requirements and simplifies calibration in analog sensor signal conditioning |
| Low ZZT (≤10 Ω) | Maintains regulation accuracy under ±5mA load transients in 12V rail monitoring circuits |
| Controlled positive TC (+0.068%/°C) | Allows predictable drift modeling for temperature-compensated reference designs using complementary components |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation systems operating from unregulated 12V supplies. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 9.1V bias to Wheatstone bridge, enabling ratiometric ADC measurements. Use Value: Maintains <±0.5% full-scale error over -40°C to +85°C due to low ZZT and known TC, eliminating need for active compensation. | Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events in embedded host controllers. IC Role / Device Role / Timing Role: Passive overvoltage clamp limiting VBUS to ≤9.56V during ESD or inductive kick events. Use Value: Absorbs 500mW pulses without degradation, meeting IEC 61000-4-2 Level 4 (15kV air) immunity requirements. |
| Programmable Logic Controller (PLC) Input Protection | Low-Power IoT Node Voltage Reference |
Use Scenario: Protecting 24V digital input channels against field-wiring faults and induced transients in industrial control cabinets. IC Role / Device Role / Timing Role: Reverse-biased Zener placed across optocoupler input to clamp fault voltages before damage occurs. Use Value: Withstands 300°C/W thermal resistance and 175°C max Tj, ensuring survival during sustained 30V miswiring events. | Use Scenario: Providing stable reference for 12-bit SAR ADC in battery-powered environmental sensor nodes. IC Role / Device Role / Timing Role: Low-current (20mA) shunt reference generating accurate 9.1V for ADC reference divider network. Use Value: Delivers <10ppm/°C effective drift after TC compensation, enabling ±0.1°C temperature measurement accuracy. |
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 |
|---|---|---|---|
| BZX55C9V1 (Vishay) | Same 9.1V nominal VZ, but 500mW DO-35 package; higher ZZT (≤20Ω) and wider tolerance (±5% vs ±5% same, but tighter distribution in ZMM series) | Less stable regulation under fast load steps due to higher impedance; larger footprint limits high-density PCB layouts | Prefer ZMM5239B-7 for space-constrained or low-impedance reference needs; BZX55C9V1 acceptable for cost-sensitive non-critical clamping |
| 1N4739A (ON Semiconductor) | Same 9.1V rating but 1W DO-41 package; significantly higher PD and ZZT (≤10Ω same, but tested at 23mA), no published TC spec | Overqualified for 500mW applications; lacks TC data needed for precision temperature compensation | Select ZMM5239B-7 when thermal drift modeling is required; choose 1N4739A only if >500mW surge handling is mandatory |
Compared with BZX55C9V1 and 1N4739A, the ZMM5239B-7 offers superior thermal stability via documented +0.068%/°C TC and MiniMELF's consistent thermal resistance - essential for reference-grade accuracy in compact industrial electronics.
Availability
ZMM5239B-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB port overvoltage protection, and programmable logic controller (PLC) input protection requiring stable component supply and traceable sourcing.
Supply support for ZMM5239B-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 centers across Asia and manufacturing in Taiwan and China.
The ZMM52xxB series belongs to Diodes' precision Zener diode product line, engineered specifically for stable voltage reference and overvoltage protection in space-constrained, thermally demanding industrial and automotive-qualified applications.
FAQ
What is the maximum continuous reverse current the ZMM5239B-7 can handle without degradation?
The ZMM5239B-7 is rated for continuous operation at up to 20mA test current (IZT) with 500mW power dissipation. Sustained currents beyond this require derating per the ambient temperature curve in Figure 1 - at 70°C ambient, maximum allowable IZ drops to ~14mA to stay within thermal limits.
Can the ZMM5239B-7 be used in place of a 9.1V Zener in a linear regulator feedback loop?
Yes, it can serve as the reference element in shunt or series regulator feedback paths. Its 10Ω ZZT and +0.068%/°C TC allow predictable loop compensation, but designers must verify loop stability with the specific op-amp and capacitor values used, as capacitive loading may affect phase margin.
Is the MiniMELF package compatible with standard reflow soldering profiles?
Yes - the ZMM5239B-7 meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and is qualified for lead-free reflow up to 260°C peak temperature. Its glass body withstands thermal shock better than plastic packages, but ramp rates should remain ≤3°C/s to avoid microfractures.
Does the ZMM5239B-7 have a specified failure mode under overvoltage stress?
Under single-event overvoltage exceeding 1.5× VZ with unclamped energy, the device typically fails short-circuit due to junction melt, allowing downstream circuit protection (e.g., fuse or polyfuse) to activate. This behavior is confirmed in Diodes Inc.'s reliability report DS30024 Rev. C-2, Section 5.2.
ZMM5239B-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):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 7 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
ZMM5239B-7 FAQ
1.How can I place an order for ZMM5239B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZMM5239B-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 ZMM5239B-7 reliable?
The price and inventory of ZMM5239B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZMM5239B-7 is usually 5 days.
3.What payment methods are accepted for ZMM5239B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZMM5239B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZMM5239B-7?
ZMM5239B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZMM5239B-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 ZMM5239B-7?
For technical support, including ZMM5239B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZMM5239B-7 requirements.
6.How does Aetrix verify that ZMM5239B-7 is sourced from the original manufacturer or authorized distributors?
All ZMM5239B-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 ZMM5239B-7 meets industry standards.
7.What is the process for return or replacement of ZMM5239B-7?
All ZMM5239B-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZMM5239B-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 ZMM5239B-7 part is unused and in its original packaging.
Return procedure for ZMM5239B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZMM5239B-7 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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