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Diodes Incorporated MMBZ5256B-7
- Part No.:
- MMBZ5256B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5256B-7.pdf
- Description:
- DIODE ZENER 30V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:335
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Product details
Overview
MMBZ5256B-7 from Diodes Incorporated is a 30V ±5% surface-mount Zener diode in SOT23 package, rated for 350mW power dissipation at 25°C, with 49Ω zener impedance at 4.2mA test current and 0.1µA reverse leakage at 23V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMBZ5256B-7 datasheet, MMBZ5256B-7 pinout, MMBZ5256B-7 application, or MMBZ5256B-7 equivalent, key selection criteria include nominal zener voltage tolerance (±5%), 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 breakdown characteristics and low dynamic impedance across the 4.2mA zener test current.
The device exhibits 0.1µA reverse leakage at VR = 23V and maintains zener voltage stability from -65°C to +150°C operating range. It is qualified to JEDEC high-reliability standards and supports automotive-grade variants via Q-suffix ordering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 30 V - precise DC reference voltage at 4.2 mA test current |
| Zener Voltage Range | 28.5–31.5 V - ±5% tolerance band defining usable regulation window |
| Zener Impedance | 49 Ω - low dynamic resistance ensuring minimal output voltage variation under load changes |
| Power Dissipation | 350 mW - maximum continuous power on FR-4 PCB with recommended pad layout |
| Reverse Leakage Current | 0.1 µA @ 23 V - negligible standby current enabling low-power system design |
| Thermal Resistance | 357 °C/W - junction-to-ambient value guiding thermal derating above 25°C ambient |
| Operating Temperature | -65 to +150 °C - wide range supporting industrial and automotive under-hood environments |
Pinout & Package
Package: SOT23 - 3-pin surface-mount plastic package with matte tin-plated alloy 42 leadframe, UL 94V-0 rated molding compound, moisture sensitivity level 1, weight ≈0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Cathode-side reference node | Connected to circuit ground or lower potential; reverse-biased operation requires cathode at higher potential |
| Cathode (Pin 2) | Zener voltage reference output | Provides regulated 30V output when reverse biased; primary connection point for voltage clamping or reference generation |
| No Connect (Pin 3) | Non-functional terminal | Internally unconnected; must remain floating or tied to cathode per layout guidelines to avoid parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight zener voltage distribution and repeatable breakdown characteristics across production lots |
| 350mW FR-4 power rating | Enables direct integration into standard PCB layouts without heatsinking in space-constrained designs |
| Lead-free & RoHS 3 compliant | Meets global environmental regulations including EU Directive 2015/863/EU for bromine/chlorine/antimony limits |
| JEDEC high-reliability qualification | Validates long-term stability and performance consistency for mission-critical industrial applications |
| SOT23 tape-and-reel packaging | Supports high-speed pick-and-place assembly with 3,000-unit reels for scalable manufacturing |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature/humidity transmitters. IC Role / Device Role / Timing Role: Zener voltage reference providing stable 30V rail for op-amp biasing and sensor excitation. Use Value: ±5% voltage tolerance and 49Ω impedance minimize measurement drift across -40°C to +85°C operating range. |
Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events. IC Role / Device Role / Timing Role: Reverse-biased overvoltage clamp limiting VBUS to 30V during ESD or inductive kick events. Use Value: 0.1µA leakage at 23V prevents standby power loss while 350mW rating absorbs short-duration 1kV ESD pulses. |
| Automotive Cabin Control Module | Programmable Logic Supply Rail Clamp |
Use Scenario: Regulating 30V supply for microcontroller I/O protection circuitry in HVAC control units. IC Role / Device Role / Timing Role: Zener-based shunt regulator maintaining clean logic supply despite battery voltage fluctuations. Use Value: -65°C to +150°C operating range and JEDEC qualification ensure reliability in under-dash environments. |
Use Scenario: Protecting FPGA configuration pins from accidental 33V programming voltage overshoot. IC Role / Device Role / Timing Role: Precision clamp preventing latch-up by limiting pin voltage to 30V ±5% during programming. Use Value: Tight 28.5–31.5V regulation window avoids false triggering while preserving signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C30LT1G | Same 30V nominal, but 300mW rating and 60Ω zener impedance at 5mA | Lower power handling and higher impedance reduce regulation accuracy in high-current sensing nodes | Select when cost-sensitive consumer designs tolerate wider voltage drift under load |
| MMBZ5256BS-7-F | Same electrical specs but SOD-323 package (smaller footprint, 250mW rating) | Reduced thermal mass limits sustained power dissipation; unsuitable for >150mW continuous use | Select only for ultra-compact layouts where board space outweighs thermal margin requirements |
Compared with BZX84-C30LT1G and MMBZ5256BS-7-F, MMBZ5256B-7 delivers superior thermal robustness (350mW vs. 300mW/250mW) and tighter regulation (49Ω vs. 60Ω/-) for industrial and automotive applications requiring long-term voltage stability.
Availability
MMBZ5256B-7 is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, and automotive cabin control modules requiring stable component supply with full traceability and lifecycle support.
Supply support for MMBZ5256B-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.
The MMBZ52xxB series targets cost-effective, high-volume voltage reference and protection applications, emphasizing JEDEC reliability, automated assembly compatibility, and environmental compliance.
FAQ
What is the maximum continuous reverse voltage MMBZ5256B-7 can withstand before breakdown?
The MMBZ5256B-7 has a nominal zener voltage of 30V with a guaranteed range of 28.5V to 31.5V at 4.2mA test current. Its reverse breakdown is specified to occur within this band; operation above 31.5V risks exceeding power dissipation limits unless current is strictly limited by external series resistance.
Can MMBZ5256B-7 be used in place of a 3.3V Zener diode like MMBZ5226B?
No - MMBZ5256B-7 is a fixed 30V zener diode and cannot substitute for 3.3V devices. Its electrical characteristics (voltage range, test current, impedance) are optimized for 30V regulation; using it at lower voltages would prevent proper reverse breakdown and result in unpredictable leakage or open-circuit behavior.
Is MMBZ5256B-7 suitable for automotive under-hood applications?
Yes - the device operates from -65°C to +150°C and is qualified to JEDEC high-reliability standards. While the base part is not AEC-Q200 certified, Diodes offers automotive-grade Q-suffix variants (e.g., MMBZ5256BQ-7-F) manufactured in IATF 16949 facilities with PPAP support for under-hood deployment.
How does the SOT23 package affect thermal performance compared to larger packages?
The SOT23 package delivers 357°C/W junction-to-ambient thermal resistance on FR-4 PCBs with recommended pad layout. This limits continuous power to 350mW at 25°C ambient; derating is required above that temperature - e.g., ~250mW at 70°C ambient - making it suitable for low-duty-cycle or pulsed applications rather than sustained high-power regulation.
MMBZ5256B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 49 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 23 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBZ5256B-7 FAQ
1.How can I place an order for MMBZ5256B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5256B-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 MMBZ5256B-7 reliable?
The price and inventory of MMBZ5256B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5256B-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5256B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5256B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5256B-7?
MMBZ5256B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5256B-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 MMBZ5256B-7?
For technical support, including MMBZ5256B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5256B-7 requirements.
6.How does Aetrix verify that MMBZ5256B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5256B-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 MMBZ5256B-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5256B-7?
All MMBZ5256B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5256B-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 MMBZ5256B-7 part is unused and in its original packaging.
Return procedure for MMBZ5256B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5256B-7 Tags
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