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Diodes Incorporated MMSZ5234B-7
- Part No.:
- MMSZ5234B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5234B-7.pdf
- Description:
- DIODE ZENER 6.2V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:9,352
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Product details
Overview
MMSZ5234B-7 from Diodes Incorporated is a 6.2 V, 500 mW surface-mount Zener diode in SOD-123 package, rated for 20 mA test current with 7 Ω dynamic impedance at 1 kHz and ≤5 µA reverse leakage at 4.0 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog and power-supply feedback circuits.
For engineers reviewing the MMSZ5234B-7 datasheet, MMSZ5234B-7 pinout, MMSZ5234B-7 application, or MMSZ5234B-7 equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (338 °C/W), AEC-Q101 qualification, RoHS/Green compliance, and SOD-123 footprint compatibility with automated PCB assembly.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage regulation across load and line variations. Its 6.2 V nominal Zener voltage exhibits a near-zero temperature coefficient (~0.02 %/°C), making it suitable for temperature-stable references in sensor signal conditioning and voltage monitoring circuits.
The device delivers 500 mW power dissipation at lead temperature of +75°C and 370 mW at ambient +25°C on FR-4 PCB with 1-inch copper pad. Its 1,000 Ω maximum Zener impedance at knee current (0.25 mA) supports reliable low-current regulation in standby or battery-backed subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.2 V nominal, 5.89–6.51 V range at 20 mA - ensures tight voltage reference tolerance for ±5% regulation accuracy |
| Power Dissipation (PD) | 370 mW @ TA = +25°C - defines maximum continuous power on standard PCB layout without forced cooling |
| Zener Impedance (ZZT) | 7 Ω @ IZT = 20 mA, f = 1 kHz - enables low-output-impedance regulation for dynamic load transients |
| Reverse Leakage (IR) | ≤5.0 µA @ VR = 4.0 V - guarantees minimal quiescent current draw in high-impedance bias networks |
| Thermal Resistance (RθJA) | 338 °C/W - determines junction temperature rise under steady-state power; requires thermal pad design for >100 mW operation |
| Operating Temperature | −65 °C to +150 °C - supports industrial and automotive under-hood applications with wide ambient range |
Pinout & Package
Package: SOD-123 - surface-mount plastic case with cathode band marking, 0.01 g mass, UL 94V-0 flammability rating, and matte tin-plated terminals solderable per MIL-STD-202.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in shunt regulation; forms ground-referenced voltage clamp point |
| Cathode | Reverse-biased Zener terminal / regulated output node | Connected to input rail; maintains fixed 6.2 V above anode during breakdown - used for feedback or clamping |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW power rating at TL = +75°C | Enables robust voltage clamping in transient suppression circuits without derating below +75°C lead temp |
| AEC-Q101 qualified | Validated for automotive electronics including body control modules and infotainment power rails |
| Halogen- and antimony-free "Green" compound | Meets strict environmental compliance (Br+Cl <1500 ppm, Sb <1000 ppm) for global OEM supply chains |
| SOD-123 footprint compatibility | Supports high-speed pick-and-place assembly and reflow soldering with industry-standard land pattern (X=0.9 mm, Y=0.95 mm) |
Applications
| Power Supply Feedback | Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck converter feedback loop using optocoupler-coupled TL431 alternative. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 6.2 V threshold for error amplifier bias and compensation network. Use Value: Maintains ±1% output regulation over line/load/temperature with no active components - reduces BOM count and failure modes. |
Use Scenario: Biasing and level-shifting analog outputs from MEMS pressure or temperature sensors operating from 3.3 V or 5 V rails. IC Role / Device Role / Timing Role: Clamping reference node to 6.2 V to set common-mode voltage or protect ADC input against overvoltage. Use Value: Prevents sensor output saturation during ESD events while preserving signal integrity via low 7 Ω dynamic impedance. |
| Microcontroller Reset Circuit | USB Port Overvoltage Protection |
Use Scenario: Generating clean reset pulse for 3.3 V microcontrollers during power-up or brown-out conditions. IC Role / Device Role / Timing Role: Zener-based RC reset generator where 6.2 V threshold triggers reset IC or internal POR circuitry. Use Value: Delivers deterministic reset timing with <1 µA leakage - extends battery life in always-on IoT edge nodes. |
Use Scenario: Protecting USB data lines (D+/D−) and VBUS against transient surges in portable docking stations. IC Role / Device Role / Timing Role: Low-capacitance (<5 pF) shunt clamp limiting VBUS to 6.2 V during 8/20 µs surge events. Use Value: Limits clamping voltage below USB 2.0 VBUS max (6.5 V), preventing damage to downstream PHY without signal distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C6V2 | Same 6.2 V nominal, but 300 mW PD @ TA, higher ZZT = 15 Ω, SOD-323 package | Lower power handling limits use in >100 mW regulation; smaller footprint increases thermal stress risk | Select when board space is constrained and power demand stays below 80 mW with adequate thermal relief |
| MMBZ5234BS | Same electrical specs, but dual-anode SOT-23 package with shared cathode - not single-diode drop-in | Requires PCB redesign; intended for dual-rail or redundancy applications, not single-point regulation | Choose only if dual-Zener topology is required; otherwise avoid due to pinout incompatibility and routing overhead |
Compared with BZX584C6V2 and MMBZ5234BS, MMSZ5234B-7 offers superior thermal capability (370 mW vs. 300 mW), lower dynamic impedance (7 Ω vs. 15 Ω), and direct SOD-123 compatibility - making it optimal for cost-sensitive, thermally demanding, single-Zener designs.
Availability
MMSZ5234B-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and consumer power adapter feedback loops requiring stable component supply and AEC-Q101 reliability assurance.
Supply support for MMSZ5234B-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, energy-efficient components for automotive, industrial, and consumer markets.
MMSZ5234B-7 belongs to the MMSZ52xxB series of general-purpose Zener diodes engineered for medium-current voltage regulation and clamping in space-constrained, high-volume PCB assemblies.
FAQ
What is the maximum reverse voltage this Zener can withstand before breakdown?
The MMSZ5234B-7 has a nominal Zener voltage of 6.2 V with a guaranteed range of 5.89 V to 6.51 V at 20 mA test current. Its breakdown is specified at this voltage range; operation above 6.51 V risks exceeding power limits unless current is strictly limited by external series resistance.
Is this part suitable for automotive applications?
Yes - MMSZ5234B-7 is explicitly qualified to AEC-Q101 standards, with operating temperature range from −65 °C to +150 °C and full RoHS/Green compliance. It is approved for use in automotive body control modules, lighting drivers, and infotainment power supplies.
How does its Zener impedance affect regulation performance?
With 7 Ω dynamic impedance at 20 mA, the MMSZ5234B-7 provides low AC impedance for ripple rejection and fast transient response. At lower currents (e.g., 1 mA), impedance rises significantly - so regulation stability depends on maintaining ≥5 mA bias current in practical designs.
Can it replace a 6.2 V TL431 in feedback circuits?
No - the MMSZ5234B-7 is a passive two-terminal Zener, lacking the adjustable reference, high gain, and sink-current capability of the TL431. It can serve as a simple fixed-voltage clamp or coarse reference, but not as a precision programmable shunt regulator.
MMSZ5234B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 6.2 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 4 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5234B-7 FAQ
1.How can I place an order for MMSZ5234B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5234B-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 MMSZ5234B-7 reliable?
The price and inventory of MMSZ5234B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5234B-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5234B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5234B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5234B-7?
MMSZ5234B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5234B-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 MMSZ5234B-7?
For technical support, including MMSZ5234B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5234B-7 requirements.
6.How does Aetrix verify that MMSZ5234B-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5234B-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 MMSZ5234B-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5234B-7?
All MMSZ5234B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5234B-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 MMSZ5234B-7 part is unused and in its original packaging.
Return procedure for MMSZ5234B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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