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Diodes Incorporated MMBZ5221BT-7-F
- Part No.:
- MMBZ5221BT-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOT-523
- Datasheet:
-
MMBZ5221BT-7-F.pdf
- Description:
- DIODE ZENER 2.4V 150MW SOT523
- Quantity:
- Payment:
- Shipping:
Inventory:7,931
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Product details
Overview
MMBZ5221BT-7-F from Diodes Incorporated is a 2.4 V, 150 mW surface-mount Zener diode in SOT-523 package, rated for 20 mA test current and 30 Ω dynamic impedance at 1 kHz, with 100 μA reverse leakage at 1.0 V, used for precision voltage reference and overvoltage protection in space-constrained portable electronics.
For engineers reviewing the MMBZ5221BT-7-F datasheet, MMBZ5221BT-7-F pinout, MMBZ5221BT-7-F application, or MMBZ5221BT-7-F equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (833 °C/W), low capacitance (~10 pF), RoHS-compliant matte tin plating, and suitability for automated SMT assembly on FR-4 PCBs.
Technical Context
This device operates as a two-terminal voltage-regulating element using planar silicon junction technology. It maintains stable reverse breakdown at 2.4 V ±5% under 20 mA DC test current, with low dynamic impedance (30 Ω) ensuring minimal voltage deviation across load variations.
Designed for ambient temperatures from –65 °C to +150 °C, it delivers predictable regulation in battery-powered systems where power dissipation must stay below 150 mW - derated linearly above 25 °C per the published curve (833 °C/W RθJA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.4 V nominal, 2.28–2.52 V range at 20 mA - defines precise clamping threshold for low-voltage rail stabilization |
| Power Dissipation (PD) | 150 mW at 25 °C - sets maximum continuous DC power handling before thermal shutdown or degradation |
| Zener Impedance (ZZT) | 30 Ω at 1 kHz, 20 mA - determines AC regulation stiffness and ripple rejection capability |
| Reverse Leakage (IR) | 100 μA at VR = 1.0 V - quantifies off-state current loss in standby or sensing circuits |
| Thermal Resistance (RθJA) | 833 °C/W - indicates temperature rise per watt on standard FR-4 layout; critical for thermal margining |
| Package | SOT-523 - 1.6 mm × 0.8 mm footprint enables high-density routing in wearables and IoT sensors |
| RoHS Compliance | Lead-free, halogen-free (Green compound post-UO date code) - meets IPC-J-STD-020D Level 1 moisture sensitivity |
Pinout & Package
SOT-523 is a 3-pin ultra-small plastic package with anode and cathode terminals only (pin 1 = anode, pin 2 = cathode, pin 3 = not connected). Polarity is marked by a cathode band on the top surface; mechanical drawings confirm 0.50 mm lead pitch and 0.22 mm lead thickness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node during regulation; carries full Zener current in reverse bias |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher-potential node; defines regulated output voltage referenced to anode |
| Pin 3 | No internal connection | Unused mechanical stub; must remain unconnected to avoid parasitic coupling or solder bridging |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SOT-523 footprint | Enables placement in <1.0 mm² board area - essential for hearing aids and medical patches |
| Planar die construction | Ensures tight VZ distribution (±5%) and repeatable ZZT across production lots |
| 150 mW power rating | Supports regulation of 3.3 V or 2.5 V logic rails without external heat sinking |
| Low 100 μA leakage at 1.0 V | Minimizes quiescent current drain in always-on battery monitoring circuits |
| Matte tin lead finish | Eliminates intermetallic growth risk during reflow; compatible with Pb-free and SnPb processes |
Applications
| Battery Voltage Monitoring | Low-Voltage Microcontroller Reset Circuit |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage during charging/discharging in portable power banks. IC Role / Device Role / Timing Role: Zener diode provides fixed 2.4 V reference to comparator input for under-voltage lockout (UVLO). Use Value: Tight ±5% VZ tolerance ensures consistent trip point across temperature and unit-to-unit variation. | Use Scenario: Generating reliable reset signal when 3.3 V supply drops below safe operating level. IC Role / Device Role / Timing Role: Acts as precision clamp in RC-based reset generator, defining threshold for Schmitt-trigger input. Use Value: Low 30 Ω ZZT prevents voltage sag during transient load steps, maintaining reset assertion integrity. |
| ESD Protection Clamp in USB Data Lines | Reference Source for ADC Biasing |
Use Scenario: Protecting D+ and D− lines against ±8 kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Placed between data line and ground to shunt surge current while limiting voltage excursion. Use Value: 150 mW rating handles single-event surges; 10 pF capacitance avoids signal integrity degradation at 480 Mbps. | Use Scenario: Providing stable 2.4 V bias to ADC reference divider network in sensor front-ends. IC Role / Device Role / Timing Role: Supplies low-noise, temperature-stable reference node for ratiometric measurement accuracy. Use Value: 833 °C/W RθJA allows direct PCB mounting near ADC without thermal drift-induced offset error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C2V4 | 2.4 V, ±5%, 300 mW, SOD-523 package - 2× power rating, same footprint | Higher PD supports sustained 30 mA operation; less sensitive to PCB thermal design | Select when >150 mW continuous dissipation is required or ambient exceeds 70 °C |
| MMBZ5221BS-7-F | Identical electrical specs but SOT-23 package - 3.0 mm × 1.4 mm vs. SOT-523's 1.6 mm × 0.8 mm | Larger pad layout eases hand-soldering and improves thermal mass; incompatible with ultra-dense layouts | Select when manual rework or higher thermal reliability outweighs size constraints |
Compared with BZX584C2V4 and MMBZ5221BS-7-F, the MMBZ5221BT-7-F uniquely balances sub-2 mm² area, 150 mW rating, and 100 μA leakage - making it optimal for miniaturized, battery-sensitive designs where both size and quiescent current are constrained.
Availability
MMBZ5221BT-7-F is available at Aetrix Electronics and suitable for battery voltage monitoring, microcontroller reset circuits, ESD protection clamps, and ADC reference biasing requiring stable component supply across high-mix, low-volume production runs.
Supply support for MMBZ5221BT-7-F 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, serving automotive, industrial, computing, and consumer markets with a focus on reliability and efficiency.
The MMBZ52xx series belongs to Diodes' general-purpose Zener portfolio, designed specifically for compact, low-power voltage regulation and protection in portable and space-constrained electronics.
FAQ
What is the maximum reverse voltage this Zener can withstand before breakdown?
The MMBZ5221BT-7-F has a nominal Zener voltage of 2.4 V with a guaranteed range of 2.28 V to 2.52 V at 20 mA test current. Its reverse breakdown is specified only within this range; applying voltage significantly beyond 2.52 V risks exceeding its 150 mW power limit and causing thermal failure.
Is this part suitable for use in automotive applications?
While MMBZ5221BT-7-F operates from –65 °C to +150 °C, it is not AEC-Q200 qualified. It may be used in non-safety-critical automotive subsystems (e.g., infotainment power rails) but requires full system-level qualification and derating per customer-specific reliability requirements.
How does the SOT-523 package affect thermal performance compared to SOT-23?
The SOT-523 package has higher thermal resistance (833 °C/W vs. ~300–400 °C/W for SOT-23), resulting in greater junction temperature rise per watt. This necessitates stricter power derating above 25 °C and limits continuous current in thermally isolated layouts.
Does this Zener diode have polarity marking, and how is it identified?
Yes - the cathode is marked by a visible band on the top surface of the SOT-523 package. Per Diodes Inc. documentation, the band aligns with Pin 2 (cathode); Pin 1 (anode) is adjacent, and Pin 3 is unconnected. The marking code "KC1" also appears adjacent to the band.
MMBZ5221BT-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 2.4 V
- Tolerance:
- ±5%
- Power - Max:
- 150 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 1 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-523
MMBZ5221BT-7-F FAQ
1.How can I place an order for MMBZ5221BT-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5221BT-7-F 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 MMBZ5221BT-7-F reliable?
The price and inventory of MMBZ5221BT-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5221BT-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5221BT-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5221BT-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5221BT-7-F?
MMBZ5221BT-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5221BT-7-F 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 MMBZ5221BT-7-F?
For technical support, including MMBZ5221BT-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5221BT-7-F requirements.
6.How does Aetrix verify that MMBZ5221BT-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5221BT-7-F 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 MMBZ5221BT-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5221BT-7-F?
All MMBZ5221BT-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5221BT-7-F, 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 MMBZ5221BT-7-F part is unused and in its original packaging.
Return procedure for MMBZ5221BT-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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