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Diodes Incorporated MMBZ5251BT-7-F
- Part No.:
- MMBZ5251BT-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOT-523
- Datasheet:
-
MMBZ5251BT-7-F.pdf
- Description:
- DIODE ZENER 22V 150MW SOT523
- Quantity:
- Payment:
- Shipping:
Inventory:2,474
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Product details
Overview
MMBZ5251BT-7-F from Diodes Incorporated is a 22 V, 150 mW surface-mount Zener diode in SOT-523 package, rated for 5.6 mA test current, 29 Ω dynamic impedance at 1 kHz, and 0.1 μA reverse leakage at 17 V, used for precision voltage regulation and overvoltage protection in space-constrained power management circuits.
For engineers reviewing the MMBZ5251BT-7-F datasheet, MMBZ5251BT-7-F pinout, MMBZ5251BT-7-F application, or MMBZ5251BT-7-F equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (833 °C/W), low capacitance (~10 pF), RoHS-compliant lead-free plating, and compatibility with automated SMT assembly on FR-4 PCBs.
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 breakdown characteristics and low parameter drift across production lots.
Designed for general-purpose voltage clamping and regulation, it delivers specified performance at 25 °C ambient with derating above 25 °C per the published power derating curve. The device exhibits typical total capacitance of ~10 pF at 22 V, supporting use in low-frequency signal conditioning and DC biasing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nom) | 22 V - precise DC voltage reference point for regulation or clamping |
| Zener Voltage Range | 20.9–23.1 V - ±5% tolerance band defining usable regulation window |
| Test Current (IZT) | 5.6 mA - standardized bias condition for measuring VZ and ZZT |
| Zener Impedance (ZZT) | 29 Ω @ 1 kHz - AC resistance determining regulation stability under dynamic load |
| Power Dissipation (PD) | 150 mW - maximum steady-state power handling on FR-4 board with recommended pad layout |
| Reverse Leakage (IR) | 0.1 μA @ 17 V - minimal off-state current enabling low-power standby operation |
| Thermal Resistance (RθJA) | 833 °C/W - defines junction-to-ambient temperature rise per watt dissipated |
Pinout & Package
Package: SOT-523 - ultra-small plastic surface-mount case (1.6 mm × 0.8 mm × 0.5 mm), UL 94V-0 rated, moisture sensitivity level 1, compatible with reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / cathode reference node in reverse-biased operation | Connected to lower-potential side in Zener clamp configuration; polarity marked on top surface |
| Cathode | Zener breakdown terminal / voltage reference output node | Connected to regulated rail or protected input; identified by marking code "KK1" on device top |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SOT-523 footprint | Enables high-density PCB layouts in portable and wearable electronics |
| Planar die construction | Ensures tight parametric distribution and long-term stability of VZ |
| 150 mW power rating | Supports low-power voltage reference and ESD transient suppression without heatsinking |
| Lead-free/RoHS-compliant plating | Meets global environmental compliance requirements for commercial and industrial end equipment |
Applications
| Power Supply Voltage Reference | Overvoltage Clamp for I/O Protection |
|---|---|
Use Scenario: Providing stable 22 V reference for feedback loop in isolated DC-DC converter secondary-side regulation. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference potential at optocoupler input or error amplifier node. Use Value: Maintains ±5% output voltage accuracy across line/load/temperature variations without external active circuitry. | Use Scenario: Clamping 24 V industrial sensor interface lines against transients induced by relay switching or ESD events. IC Role / Device Role / Timing Role: Passive shunt protector that conducts only when line voltage exceeds 23.1 V, diverting surge energy to ground. Use Value: Limits peak voltage to safe levels for downstream MCU GPIOs rated for 24 V absolute maximum, with <0.1 μA leakage in normal operation. |
| Low-Power Bias Generator | Temperature-Stable Reference for Analog Sensors |
Use Scenario: Generating fixed 22 V bias for high-impedance analog front-end stages in battery-powered instrumentation. IC Role / Device Role / Timing Role: Zener-based passive voltage source feeding op-amp non-inverting input or ADC reference divider. Use Value: Delivers stable bias with <29 Ω dynamic impedance, minimizing noise coupling and load-induced drift. | Use Scenario: Supplying excitation voltage to resistive temperature detectors (RTDs) in HVAC control modules. IC Role / Device Role / Timing Role: Precision voltage reference establishing known current through RTD element for linear resistance measurement. Use Value: Enables <±0.5 °C temperature resolution over –40 to +125 °C due to tight VZ tolerance and low thermal coefficient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C22LT1G | 22 V, 300 mW, SOT-23 package, 40 Ω ZZT, higher power but larger footprint | Preferred where higher surge tolerance or board-level thermal margin is required | Select when PCB layout allows SOT-23 and >150 mW continuous dissipation is needed |
| MMSZ5251ET1G | 22 V, 500 mW, SOD-123 package, 30 Ω ZZT, higher power, larger size, same voltage tolerance | Suitable for manual prototyping or high-reliability industrial designs with less space constraint | Choose for legacy board compatibility or where 500 mW headroom improves long-term reliability under thermal stress |
Compared with BZX584C22LT1G and MMSZ5251ET1G, MMBZ5251BT-7-F offers the smallest PCB area (SOT-523), lowest weight (0.002 g), and best fit for ultra-compact consumer and medical wearables-while trading off absolute power handling for miniaturization.
Availability
MMBZ5251BT-7-F is available at Aetrix Electronics and suitable for power supply reference design, industrial I/O protection, portable sensor biasing, and medical wearable voltage regulation requiring stable component supply and full traceability.
Supply support for MMBZ5251BT-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.
This device belongs to the MMBZ52xxBT series of miniature Zener diodes designed specifically for space-constrained, low-power voltage regulation and protection in high-volume SMT applications.
FAQ
What is the maximum reverse voltage before breakdown for MMBZ5251BT-7-F?
The nominal Zener voltage is 22 V with a guaranteed range of 20.9 V to 23.1 V at 5.6 mA test current. Breakdown begins near the minimum value (20.9 V); operation below this voltage results in negligible reverse current (<0.1 μA at 17 V). Full regulation occurs within the specified range under defined thermal conditions.
Can MMBZ5251BT-7-F be used in place of a 24 V Zener diode?
No - MMBZ5251BT-7-F is strictly a 22 V device (20.9–23.1 V range). Substituting it for a 24 V Zener (e.g., MMBZ5252BT) would result in premature conduction and incorrect regulation. Always match nominal Zener voltage and tolerance to circuit requirements; cross-reference using the full part number and electrical table.
Is the SOT-523 package hand-solderable?
Yes, but with significant skill and proper tools: the 0.5 mm pitch and 0.8 mm body width require fine-tip irons, flux, and magnification. Diodes Incorporated qualifies it for reflow soldering per J-STD-020; hand-soldering is not recommended for production and risks thermal damage or tombstoning without optimized technique and board layout.
Does MMBZ5251BT-7-F have a specified temperature coefficient?
The datasheet does not publish a numeric temperature coefficient (TC) for this part. However, typical Zener TC for devices in the 20–24 V range is approximately +0.05 %/°C to +0.08 %/°C. For precision applications requiring TC data, consult Diodes Incorporated's application note AP02003 or select a temperature-compensated Zener series such as the BZX84-C22LT1G.
MMBZ5251BT-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):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 150 mW
- Impedance (Max) (Zzt):
- 29 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 17 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
MMBZ5251BT-7-F FAQ
1.How can I place an order for MMBZ5251BT-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5251BT-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 MMBZ5251BT-7-F reliable?
The price and inventory of MMBZ5251BT-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 MMBZ5251BT-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5251BT-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5251BT-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5251BT-7-F?
MMBZ5251BT-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5251BT-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 MMBZ5251BT-7-F?
For technical support, including MMBZ5251BT-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5251BT-7-F requirements.
6.How does Aetrix verify that MMBZ5251BT-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5251BT-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 MMBZ5251BT-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5251BT-7-F?
All MMBZ5251BT-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5251BT-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 MMBZ5251BT-7-F part is unused and in its original packaging.
Return procedure for MMBZ5251BT-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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