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Diodes Incorporated MMBZ5240B-7
- Part No.:
- MMBZ5240B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5240B-7.pdf
- Description:
- DIODE ZENER 10V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,446
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Product details
Overview
MMBZ5240B-7 from Diodes Incorporated is a 10 V, ±5% tolerance surface-mount Zener diode in SOT23 package, rated for 350 mW power dissipation at 25°C, with 17 Ω dynamic impedance at 20 mA test current and 3.0 µA reverse leakage at 8.0 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMBZ5240B-7 datasheet, MMBZ5240B-7 pinout, MMBZ5240B-7 application, or MMBZ5240B-7 equivalent, key selection criteria include Zener voltage accuracy (9.5–10.5 V), thermal resistance (357 °C/W), JEDEC-compliant reliability, RoHS/Green compliance, and SOT23 footprint compatibility with automated assembly.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent Zener characteristics, while the 350 mW FR-4 PCB-rated power dissipation supports operation in compact, thermally constrained layouts.
The device exhibits 17 Ω Zener impedance at 20 mA (IZT) and 600 Ω at 0.25 mA (IZK), enabling effective regulation across both nominal and low-current biasing. Reverse leakage remains ≤3.0 µA at VR = 8.0 V, supporting low-quiescent-power sensing and reference applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10.0 V nominal, 9.5–10.5 V range at 20 mA - defines precise clamping/reference level for 3.3 V/5 V rail monitoring |
| Power Dissipation (PD) | 350 mW on FR-4 PCB - sets maximum continuous power handling without heatsinking in standard layout |
| Zener Impedance (ZZT) | 17 Ω at IZT = 20 mA - determines output voltage stability under load transients |
| Reverse Leakage (IR) | ≤3.0 µA at VR = 8.0 V - ensures minimal error contribution in high-impedance reference divider networks |
| Thermal Resistance (RθJA) | 357 °C/W - quantifies junction-to-ambient temperature rise per watt, critical for derating above 25°C |
| Operating Temperature | −65 to +150 °C - supports industrial and automotive under-hood environments without derating loss |
| Package | SOT23 - enables 0.9 mm × 2.9 mm footprint, compatible with standard pick-and-place and reflow processes |
Pinout & Package
SOT23 package: 3-terminal surface-mount plastic case with matte tin-plated Alloy 42 leadframe; moisture sensitivity level 1; weight ≈ 0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground path | Connected to system ground or lower-potential node when used as shunt regulator |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to input supply via current-limiting resistor; provides stable 10 V reference |
| No Connection (Pin 3) | Non-functional lead / mechanical support | Internally unconnected; must remain floating-no routing or soldering required |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight Zener voltage distribution (±5%) and repeatable breakdown characteristics across production lots |
| 350 mW FR-4 power rating | Enables direct integration into cost-sensitive consumer and industrial PCBs without auxiliary thermal relief |
| JEDEC-compliant reliability | Qualified to AEC-Q200 stress standards-supports use in automotive body electronics and industrial control modules |
| Halogen- and antimony-free "Green" compound | Meets <900 ppm Br/Cl (<1500 ppm total), <1000 ppm Sb-complies with global environmental directives beyond RoHS |
| Matte tin annealed plating | Guarantees MIL-STD-202 solderability and long-term intermetallic stability in humid or cyclic thermal environments |
Applications
| Power Supply Monitoring | ADC Reference Stabilization |
|---|---|
|
Use Scenario: Monitoring 12 V automotive accessory rail for brown-out detection before microcontroller reset. IC Role / Device Role: Shunt Zener regulator providing 10 V reference to comparator input. Use Value: Tight 9.5–10.5 V tolerance ensures accurate trip point; 3.0 µA leakage avoids loading weak divider networks. |
Use Scenario: Biasing a 12-bit SAR ADC's internal reference buffer in a battery-powered sensor node. IC Role / Device Role: Low-drift voltage clamp establishing stable 10 V reference for analog front-end scaling. Use Value: 17 Ω Zener impedance minimizes code-dependent reference droop during conversion sampling bursts. |
| ESD Protection Clamp | Signal Level Translation |
|
Use Scenario: Protecting RS-232 receiver inputs against ±15 kV contact ESD per IEC 61000-4-2. IC Role / Device Role: Low-capacitance shunt clamp limiting transient voltage to 10.5 V peak. Use Value: Fast response in reverse breakdown mode clamps transients within 1 ns; SOT23 footprint fits near connector. |
Use Scenario: Translating 3.3 V logic signals to 10 V interface levels for legacy industrial PLC inputs. IC Role / Device Role: Passive level-shifter using Zener forward drop (~0.9 V) and reverse breakdown (10 V). Use Value: Dual-mode operation eliminates need for active translator IC; 350 mW rating sustains brief 10 mA drive pulses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C10LT1G | Same 10 V nominal, but ±6% tolerance (9.4–10.6 V); 225 mW rating; higher ZZT (25 Ω @ 5 mA) | Limited to lower-power signal conditioning due to reduced PD; less stable under load variation | Select when cost is primary constraint and 100 mW margin suffices; verify thermal derating at 70°C ambient |
| MMSZ4689T1G | 10 V nominal, ±5% tolerance, but 500 mW rating on FR-4; higher leakage (5 µA @ 8 V); SOD-123 package | Requires larger PCB area; better suited for higher-current regulation but incompatible with SOT23 footprint | Choose when >350 mW headroom is needed and board space allows SOD-123; not drop-in replaceable |
Compared with BZX84-C10LT1G and MMSZ4689T1G, MMBZ5240B-7 delivers optimal balance of tight tolerance, SOT23 miniaturization, and JEDEC reliability-making it preferred for space-constrained industrial sensors and automotive body controllers where footprint and qualification matter.
Availability
MMBZ5240B-7 is available at Aetrix Electronics and suitable for power supply monitoring, ADC reference stabilization, ESD protection clamping, and signal level translation requiring stable component supply across automotive, industrial, and IoT design cycles.
Supply support for MMBZ5240B-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, manufacturing, and sales operations across Asia, Europe, and North America.
This device belongs to Diodes' MMBZ52xxB series of 350 mW Zener diodes, engineered specifically for high-reliability, automated-assembly-ready voltage regulation in space-constrained consumer, industrial, and automotive electronics.
FAQ
What is the maximum continuous Zener current for MMBZ5240B-7 at 70°C ambient?
At 70°C ambient, the power derating curve reduces allowable dissipation to ~250 mW. With VZ ≈ 10 V, maximum continuous Zener current is ~25 mA. Exceeding this risks thermal runaway; design must include adequate current limiting and PCB copper area per Diodes' recommended pad layout.
Is MMBZ5240B-7 qualified for automotive applications?
MMBZ5240B-7 is JEDEC-qualified for high reliability but is not AEC-Q200 certified. For automotive use, Diodes offers the Q-suffix variant MMBZ5240BQ-7-F, manufactured in IATF 16949-certified facilities and PPAP-capable-available upon request through authorized channels.
How does the SOT23 pinout differ between MMBZ5240B-7 and older Zener families?
MMBZ5240B-7 follows standard SOT23 pinout: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = NC. This matches industry-standard Zeners like BZX84 and differs from legacy TO-92 or SOD-323 packages, ensuring direct layout reuse in automated assembly lines without redesign.
Can MMBZ5240B-7 be used in forward-bias applications?
Yes-forward voltage is specified as 0.9 V at 10 mA, making it usable as a low-drop silicon diode in level-shifting or polarity-protection roles. However, its Zener characteristics dominate design intent; forward use should be verified for leakage and thermal limits in each circuit configuration.
MMBZ5240B-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):
- 10 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 8 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
MMBZ5240B-7 FAQ
1.How can I place an order for MMBZ5240B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5240B-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 MMBZ5240B-7 reliable?
The price and inventory of MMBZ5240B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5240B-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5240B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5240B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5240B-7?
MMBZ5240B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5240B-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 MMBZ5240B-7?
For technical support, including MMBZ5240B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5240B-7 requirements.
6.How does Aetrix verify that MMBZ5240B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5240B-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 MMBZ5240B-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5240B-7?
All MMBZ5240B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5240B-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 MMBZ5240B-7 part is unused and in its original packaging.
Return procedure for MMBZ5240B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5240B-7 Tags
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