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Diodes Incorporated MMBZ5241B-7
- Part No.:
- MMBZ5241B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5241B-7.pdf
- Description:
- DIODE ZENER 11V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,353
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Product details
Overview
MMBZ5241B-7 from Diodes Incorporated is a 350mW surface-mount Zener diode with nominal zener voltage of 11V (10.45–11.55V range at 20mA test current), 22Ω zener impedance at 20mA, and 2.0µA reverse leakage at 8.4V. It operates from −65°C to +150°C and is used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMBZ5241B-7 datasheet, MMBZ5241B-7 pinout, MMBZ5241B-7 application, or MMBZ5241B-7 equivalent, key selection criteria include zener voltage tolerance, dynamic impedance at rated test current, thermal resistance (357°C/W on FR-4), SOT23 package compatibility, and JEDEC-compliant reliability for industrial and automotive-qualified derivatives.
Technical Context
This Zener diode employs planar die construction for stable breakdown characteristics and low leakage. Its 350mW power dissipation is specified on FR-4 PCB with recommended pad layout, and thermal resistance is fixed at 357°C/W junction-to-ambient under those conditions.
The device exhibits 22Ω dynamic impedance at 20mA zener test current and maintains ≤2.0µA reverse leakage at VR = 8.4V - critical for low-current biasing and reference stability. It is fully RoHS-compliant, halogen- and antimony-free, and qualified to JEDEC high-reliability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 11 V - precise DC reference voltage at 20 mA test current, ±5% tolerance (10.45–11.55 V) |
| Zener Impedance | 22 Ω @ 20 mA - low dynamic resistance ensures minimal output voltage variation under load changes |
| Reverse Leakage Current | 2.0 µA @ 8.4 V - enables stable operation in high-impedance bias networks without significant error current |
| Power Dissipation | 350 mW on FR-4 PCB - defines maximum continuous DC power handling under standard mounting conditions |
| Thermal Resistance | 357 °C/W - quantifies temperature rise per watt; requires thermal-aware PCB layout for sustained operation |
| Operating Temperature | −65°C to +150°C - supports deployment in extended industrial and under-hood automotive environments |
Pinout & Package
Package: SOT23 - surface-mount, 3-terminal plastic package with matte tin finish on Alloy 42 leadframe; moisture sensitivity level 1 per J-STD-020; weight ≈ 0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; must be routed with low-inductance path for transient suppression |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to regulated voltage node; carries full zener current during regulation; primary heat-generating terminal |
| No-Connect / Heat Sink (Pin 3) | Leadframe thermal path | Internally tied to cathode metallization; provides secondary thermal conduction path to PCB copper; not electrically isolated |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable zener voltage distribution and long-term parametric stability across temperature and life cycles |
| 350 mW FR-4 power rating | Enables direct replacement in legacy 1/4W through-hole designs without board redesign when using recommended pad layout |
| JEDEC High Reliability qualification | Validates robustness for mission-critical applications where field failure risk must be minimized (e.g., industrial control, power supply feedback) |
| Halogen- and antimony-free "Green" compound | Meets stringent environmental compliance (Br+Cl <1500 ppm, Sb <1000 ppm) without compromising molding integrity or thermal performance |
Applications
| Power Supply Feedback Reference | Microcontroller I/O Clamp Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback or buck converter secondary-side regulation loops. IC Role / Device Role / Timing Role: Zener diode acts as precision shunt reference, setting output voltage via optocoupler bias current. Use Value: 11V nominal voltage and 22Ω impedance maintain tight regulation (<±1.5%) across line/load transients and temperature drift. |
Use Scenario: Protecting 3.3V or 5V microcontroller GPIO pins from ESD and overvoltage events exceeding rail limits. IC Role / Device Role / Timing Role: Bidirectional clamping device limiting input voltage to safe levels while minimizing leakage into sensitive logic inputs. Use Value: 2.0µA leakage at 8.4V prevents false triggering; fast response preserves signal integrity during sub-100ns transients. |
| Low-Power Sensor Bias Network | Industrial Analog Signal Conditioning |
Use Scenario: Providing stable excitation voltage to resistive sensors (e.g., RTDs, strain gauges) in battery-powered instrumentation. IC Role / Device Role / Timing Role: Low-current Zener reference source delivering consistent bias independent of supply fluctuations. Use Value: Sub-µA leakage and tight 5% voltage tolerance enable <0.1% measurement accuracy in 16-bit ADC systems. |
Use Scenario: Level-shifting and overvoltage protection in 4–20mA transmitter front-ends operating in harsh factory environments. IC Role / Device Role / Timing Role: Shunt regulator absorbing surge energy and clamping loop voltage to prevent op-amp saturation or DAC damage. Use Value: −65°C to +150°C operating range and JEDEC qualification ensure uninterrupted operation in uncontrolled ambient enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C11LT1G | 11V nominal, 300mW rating, 30Ω ZT @ 5mA, higher leakage (5µA @ 8.4V) | Lower power handling and higher dynamic impedance reduce regulation accuracy in precision feedback paths | Select when cost sensitivity outweighs regulation stability; verify thermal margin on FR-4 at >250mW dissipation |
| MMBZ5241BS-7-F | Same electrical specs but SOD-323 package (smaller footprint, higher RθJA = 430°C/W) | Reduced PCB area usage but requires tighter thermal management due to 20% higher thermal resistance | Choose only if board space is constrained and peak power remains below 250mW with enhanced copper pour |
Compared with BZX84-C11LT1G and MMBZ5241BS-7-F, MMBZ5241B-7 delivers superior regulation stability (22Ω vs. 30Ω), lower leakage (2.0µA vs. 5µA), and better thermal performance (357°C/W vs. 430°C/W), making it optimal for precision analog and thermally demanding industrial designs.
Availability
MMBZ5241B-7 is available at Aetrix Electronics and suitable for power supply feedback references, microcontroller I/O clamp protection, and low-power sensor bias networks requiring stable component supply across production lifecycles.
Supply support for MMBZ5241B-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 components for industrial, automotive, and computing markets.
This part belongs to the MMBZ52xxB series of 350mW Zener diodes designed specifically for automated SMT assembly and precision voltage reference applications in space-constrained, thermally challenging environments.
FAQ
What is the maximum continuous zener current for MMBZ5241B-7 at 25°C ambient?
The absolute maximum zener current is derived from its 350mW power rating and 11V nominal voltage: IMAX = 350mW / 11V ≈ 31.8mA. However, derating begins above 25°C per Figure 1 - at 70°C ambient, max current drops to ~22mA to stay within thermal limits on FR-4.
Can MMBZ5241B-7 replace a 1N4740A in existing designs?
Yes, with caveats: both are 11V Zeners, but MMBZ5241B-7 has lower power (350mW vs. 1W), smaller SOT23 package, and tighter voltage tolerance (±5% vs. ±5% typical but wider binning). Verify that circuit current stays below 31.8mA and that thermal design accommodates reduced power handling.
Is MMBZ5241B-7 qualified for automotive use?
Standard MMBZ5241B-7 is not AEC-Q200 qualified. Diodes offers automotive-grade variants (e.g., MMBZ5241BQ-7-F) with PPAP capability, manufactured in IATF 16949-certified facilities, and tested to AEC-Q200 stress requirements - these carry the "Q" suffix and are listed on Diodes' automotive products page.
How does the third pin (SOT23 Pin 3) function electrically?
Pin 3 is internally connected to the cathode metallization and serves as an auxiliary thermal conduction path - not an isolated terminal. It must be soldered to PCB copper for thermal performance but introduces no additional electrical node; schematic symbols should show only two terminals (anode/cathode).
MMBZ5241B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 11 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 22 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 8.4 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:
- SOT-23-3
MMBZ5241B-7 FAQ
1.How can I place an order for MMBZ5241B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5241B-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 MMBZ5241B-7 reliable?
The price and inventory of MMBZ5241B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5241B-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5241B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5241B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5241B-7?
MMBZ5241B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5241B-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 MMBZ5241B-7?
For technical support, including MMBZ5241B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5241B-7 requirements.
6.How does Aetrix verify that MMBZ5241B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5241B-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 MMBZ5241B-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5241B-7?
All MMBZ5241B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5241B-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 MMBZ5241B-7 part is unused and in its original packaging.
Return procedure for MMBZ5241B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5241B-7 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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