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onsemi MMBZ5241B
- Part No.:
- MMBZ5241B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5241B.pdf
- Description:
- DIODE ZENER 11V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:30,000
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Product details
Overview
MMBZ5241B from Fairchild Semiconductor is a 11 V ±5% surface-mount Zener diode in SOT-23 package, rated for 20 mA test current, 22 Ω dynamic impedance at 20 mA, and 2.0 μA reverse leakage at 8.4 V, used for precision voltage regulation and reference in low-power analog circuits.
For engineers reviewing the MMBZ5241B datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal limits, SOT-23 terminal mapping, and direct alternative options for voltage reference design and overvoltage protection.
Technical Context
The MMBZ5241B operates as a silicon planar Zener diode with sharp reverse breakdown at nominal 11.0 V, specified under 20 mA Zener test current and 25°C ambient. Its 22 Ω Zener impedance ensures stable regulation across load variations, while 2.0 μA reverse leakage at 8.4 V supports low-quiescent-current biasing.
Thermal performance is defined by 465°C/W junction-to-ambient resistance on FR-4 PCB (76.2 mm × 114.3 mm), limiting continuous power dissipation to 250 mW at 25°C ambient. The device's maximum junction temperature is 150°C, with storage range from –55°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10.45 V (min) to 11.55 V (max) at IZ = 20 mA - defines tight 11 V ±5% regulation window for reference stability |
| Zener Impedance (ZZ) | 22 Ω at IZ = 20 mA - enables low output impedance for minimal voltage shift under load transients |
| Reverse Leakage (IR) | 2.0 μA max at VR = 8.4 V - ensures negligible current draw in standby mode of battery-powered sensors |
| Power Dissipation (PD) | 250 mW at TA = 25°C - sets maximum continuous DC power limit on standard FR-4 board |
| Junction Temperature (TJ) | +150°C absolute max - constrains thermal design margin for high-temperature industrial environments |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - guarantees low conduction loss when used bidirectionally or as clamp |
Pinout & Package
SOT-23 plastic surface-mount package with gull-wing leads; cathode marked by band on lead 1 side. Device mounted with cathode (pin 1) and anode (pin 2) active; pin 3 is NC (no connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener breakdown terminal | Connected to regulated voltage node; polarity must be observed to enable reverse-bias operation |
| 2 (Anode) | Reference ground return | Common return path for Zener current; ties to system ground or bias rail |
| 3 (NC) | No connection | Unbonded die pad; must remain unconnected and unshorted in PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables accurate 11 V reference without external trimming in ADC reference or LDO feedback paths |
| 22 Ω dynamic impedance | Maintains <±10 mV output variation across 5–25 mA load current range in regulator applications |
| 2.0 μA reverse leakage @ 8.4 V | Permits use in micropower sensor nodes where standby current must stay below 5 μA |
| SOT-23 footprint | Supports automated placement and reflow in space-constrained consumer and IoT PCBs |
| 150°C max junction temperature | Allows operation in enclosed enclosures or near heat sources without derating below 85°C ambient |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure transducers in factory automation systems. IC Role / Device Role / Timing Role: Precision 11 V Zener reference providing stable bias to Wheatstone bridge. Use Value: Maintains ±0.5% bridge output accuracy over –40°C to +85°C due to low tempco and 22 Ω ZZ. |
Use Scenario: Protecting downstream USB data lines from accidental 12 V supply misconnection. IC Role / Device Role / Timing Role: Bidirectional transient clamp using forward conduction (VF ≤ 0.9 V) and reverse Zener action (11 V). Use Value: Limits clamped voltage to ≤11.6 V during fault, within USB 2.0 PHY absolute max rating. |
| Low-Power RTC Backup Regulator | Programmable Logic Supply Reference |
Use Scenario: Generating clean 11 V bias for real-time clock oscillator circuitry powered from coin cell. IC Role / Device Role / Timing Role: Low-leakage (2.0 μA) Zener shunt regulator maintaining oscillator VDD. Use Value: Extends CR2032 battery life beyond 3 years by minimizing quiescent current drain. |
Use Scenario: Setting threshold voltage for FPGA configuration I/O bank power-on reset detection. IC Role / Device Role / Timing Role: Stable 11 V reference input to comparator monitoring 12 V system rail. Use Value: Ensures reset assertion within 100 ms of rail crossing 11.2 V, meeting Xilinx Spartan-7 timing spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C11 | Same 11 V nominal, ±5% tolerance, but 30 Ω ZZ at 5 mA (vs. 22 Ω at 20 mA); 5 μA IR @ 8.4 V | Higher impedance reduces regulation accuracy under varying loads; higher leakage limits ultra-low-power use | Select BZX84-C11 only if cost sensitivity outweighs regulation precision and standby current requirements |
| MMBZ5241BS | Identical electrical specs but in SOD-323 package (smaller footprint, 290°C/W RθJA) | Lower thermal resistance allows 300 mW dissipation on same board; requires revised land pattern | Choose MMBZ5241BS when board area is constrained and thermal headroom must be increased without changing circuit function |
Compared with BZX84-C11 and MMBZ5241BS, the MMBZ5241B offers optimal balance of low ZZ, ultra-low IR, and proven SOT-23 manufacturability-making it preferred for production-grade voltage references where regulation fidelity and long-term reliability are prioritized over minimal cost or smallest size.
Availability
MMBZ5241B is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, and low-power RTC backup regulators requiring stable component supply and full traceability.
Supply support for MMBZ5241B 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The MMBZ52xxB series was designed for general-purpose voltage regulation and reference in commercial-grade consumer, computing, and industrial electronics-emphasizing consistency, thermal robustness, and SMT compatibility.
FAQ
What is the exact Zener voltage range for MMBZ5241B at 20 mA test current?
The MMBZ5241B has a guaranteed Zener voltage range of 10.45 V (minimum) to 11.55 V (maximum) when tested at IZ = 20 mA and TA = 25°C. This ±5% tolerance is measured per the Fairchild MMBZ5221B–MMBZ5257B datasheet Rev. 1.5, ensuring predictable regulation behavior in feedback and reference circuits.
Can MMBZ5241B be used in bidirectional ESD protection applications?
Yes, the MMBZ5241B supports bidirectional clamping: its forward voltage is ≤0.9 V at 10 mA, and reverse breakdown is centered at 11 V. When paired with a series resistor, it can protect low-voltage data lines from both positive and negative transients-though dedicated TVS devices offer lower clamping voltage for high-speed interfaces.
What is the maximum allowable power dissipation for MMBZ5241B on a standard FR-4 PCB?
The MMBZ5241B is rated for 250 mW continuous power dissipation when mounted on a 76.2 mm × 114.3 mm FR-4 PCB at TA = 25°C. Derating is required above 25°C ambient per the 465°C/W junction-to-ambient thermal resistance; at 70°C ambient, max power drops to approximately 135 mW.
Does MMBZ5241B have a specified temperature coefficient?
No explicit temperature coefficient (TC) value is published for MMBZ5241B in the datasheet. However, typical Zener voltage drift vs. temperature curves for adjacent voltages (e.g., 12 V and 33 V variants) indicate a positive TC of ~0.07%/°C near 11 V, consistent with mid-voltage Zener diodes. For critical temp-stable designs, consider compensated references.
Is pin 3 of MMBZ5241B electrically connected internally?
No, pin 3 of the MMBZ5241B is a no-connect (NC) terminal-unbonded at the die level. It must not be soldered to any net or grounded on the PCB. Leaving it floating is mandatory; connecting it may cause unpredictable leakage or thermal stress due to internal package structure.
MMBZ5241B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 11 V
- Tolerance:
- ±5%
- Power - Max:
- 300 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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23
MMBZ5241B FAQ
1.How can I place an order for MMBZ5241B through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5241B 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 reliable?
The price and inventory of MMBZ5241B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5241B is usually 5 days.
3.What payment methods are accepted for MMBZ5241B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5241B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5241B?
MMBZ5241B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5241B 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?
For technical support, including MMBZ5241B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5241B requirements.
6.How does Aetrix verify that MMBZ5241B is sourced from the original manufacturer or authorized distributors?
All MMBZ5241B 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 meets industry standards.
7.What is the process for return or replacement of MMBZ5241B?
All MMBZ5241B units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5241B, 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 part is unused and in its original packaging.
Return procedure for MMBZ5241B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5241B Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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