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onsemi MMBZ5256ELT1G
- Part No.:
- MMBZ5256ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5256ELT1G.pdf
- Description:
- DIODE ZENER 30V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,273
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Product details
Overview
MMBZ5256ELT1G from onsemi is a 30 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation at 25°C, with 4.2 mA test current (IZT), 49 Ω dynamic impedance (ZZT), and 0.1 μA leakage current at 23 V reverse bias - used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the MMBZ5256ELT1G datasheet, pinout, applications, or equivalent options, this device serves as a space-constrained, ESD-hardened (Class 3, >16 kV HBM) Zener regulator for low-power voltage clamping and reference stabilization in battery-powered systems.
Technical Context
The MMBZ5256ELT1G operates as a two-terminal silicon Zener diode with cathode-anode polarity and no internal connection on pin 2. Its regulation behavior is defined by reverse-biased breakdown at nominal 30 V with temperature coefficient of +11 mV/°C (typical for 28–32 V range), enabling stable reference generation across −65°C to +150°C junction temperature.
It delivers specified Zener impedance (49 Ω @ 4.2 mA) and low leakage (≤0.1 μA @ 23 V), supporting accurate voltage clamping in signal conditioning and supply rail supervision circuits where thermal drift and dynamic response matter.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 28.5 V min / 30 V nom / 31.5 V max @ IZT = 4.2 mA - defines tight regulation window for 3.3 V or 5 V rail monitoring with ±5% tolerance. |
| Power Dissipation (PD) | 225 mW @ TA = 25°C on FR-5 board - supports continuous low-power clamping without heatsinking in compact layouts. |
| Zener Impedance (ZZT) | 49 Ω @ IZT = 4.2 mA - ensures minimal voltage deviation under load transients in feedback or reference paths. |
| Leakage Current (IR) | ≤0.1 μA @ VR = 23 V - enables high-impedance sensing and low-quiescent-current operation in battery-backed circuits. |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - protects against handling-induced discharge in automated assembly and field deployment. |
| Junction Temp Range | −65°C to +150°C - qualified for automotive under-hood and industrial ambient environments without derating loss. |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish; polarity band indicates cathode; maximum soldering temperature 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node (e.g., ground or return path) during Zener operation; forward conduction path when biased positively. |
| 2 | No Connection | Internally unconnected terminal - must remain floating; no PCB trace or pad required beyond mechanical support. |
| 3 | Cathode | Connected to regulated voltage node; carries reverse current during Zener breakdown; marked by polarity band on package. |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating on FR-5 Board | Enables reliable voltage clamping in space-constrained PCBs without thermal vias or copper pour. |
| ESD Hardness >16 kV (HBM) | Eliminates need for external ESD protection in handheld and portable designs, reducing BOM count. |
| Pb-Free SOT-23 Package | Meets RoHS and ELV compliance requirements for global consumer and automotive shipments. |
| Peak Pulse Power: 225 W (8 × 20 µs) | Withstands transient surges such as EFT bursts without degradation, extending system-level surge immunity. |
Applications
| Smartphone Power Management | IoT Sensor Node Reference |
|---|---|
|
Use Scenario: Clamping 3.3 V LDO output against load dump or hot-swap transients in smartphone PMIC subsystems. IC Role / Device Role / Timing Role: Zener diode providing shunt overvoltage protection and stable 30 V reference for comparator threshold setting. Use Value: Prevents downstream IC damage during 12 V-to-3.3 V DC-DC converter fault conditions while occupying <1 mm² PCB area. |
Use Scenario: Generating precise bias voltage for analog front-end op-amps in battery-powered environmental sensors. IC Role / Device Role / Timing Role: Low-leakage (≤0.1 μA) Zener reference source replacing larger TL431-based solutions. Use Value: Extends 10-year battery life in wireless sensor nodes by minimizing quiescent current in reference circuitry. |
| Automotive Body Control Module | Industrial PLC Input Protection |
|
Use Scenario: Protecting LIN bus transceiver inputs from ISO 7637-2 pulse 1/2a transients in vehicle door modules. IC Role / Device Role / Timing Role: Fast-response Zener clamp absorbing 225 W peak pulses without latch-up or parametric shift. Use Value: Achieves AEC-Q101 qualification and meets OEM EMC robustness requirements without additional TVS stages. |
Use Scenario: Safeguarding 24 V digital input channels against field-wiring induced surges in factory automation controllers. IC Role / Device Role / Timing Role: Primary overvoltage limiter placed before optocoupler input, operating continuously at 25°C ambient. Use Value: Maintains ≤31.5 V clamping voltage under 4.2 mA test current, ensuring safe opto-LED forward bias margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C30LT1G | Same 30 V nominal Zener voltage but higher ZZT (90 Ω vs. 49 Ω); 350 mW rating on FR-4; no AEC-Q101 qualification. | Lacks automotive qualification and tighter impedance spec; suitable only for non-critical commercial-grade clamping. | Select when cost sensitivity outweighs impedance stability and automotive compliance requirements. |
| SZMMBZ5256ELT1G | Identical electrical specs and SOT-23 package; differs only in AEC-Q101 certification, PPAP capability, and automotive-specific traceability controls. | Required for Tier-1 automotive BOMs; same thermal and electrical behavior in non-automotive use cases. | Choose MMBZ5256ELT1G for industrial/commercial designs; upgrade to SZ prefix only when automotive documentation is mandated. |
Compared with BZX84-C30LT1G and SZMMBZ5256ELT1G, the MMBZ5256ELT1G offers optimal balance of low dynamic impedance, Class 3 ESD rating, and industrial temperature range - making it preferred for high-reliability portable and embedded systems where layout density and long-term stability are critical.
Availability
MMBZ5256ELT1G is available at Aetrix Electronics and suitable for smartphone power management, IoT sensor node reference, automotive body control modules, and industrial PLC input protection requiring stable component supply and full traceability.
Supply support for MMBZ5256ELT1G 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
onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ52xxELT1G series targets high-density, low-power voltage regulation in portable and automotive electronics - emphasizing small footprint, ESD resilience, and wide temperature operation.
FAQ
What is the Zener voltage tolerance of MMBZ5256ELT1G?
The MMBZ5256ELT1G has a nominal Zener voltage of 30 V with minimum 28.5 V and maximum 31.5 V at IZT = 4.2 mA, corresponding to ±5% tolerance. This tight spread ensures predictable clamping behavior in precision reference and protection circuits without post-manufacturing calibration.
Does MMBZ5256ELT1G have an automotive qualification option?
Yes - the SZMMBZ5256ELT1G variant is AEC-Q101 qualified and PPAP capable, sharing identical electrical and thermal specifications with MMBZ5256ELT1G but adding automotive-specific process controls, traceability, and documentation. The base MMBZ5256ELT1G is rated for industrial use.
What is the meaning of "NC" on pin 2 of MMBZ5256ELT1G?
Pin 2 of the MMBZ5256ELT1G is internally not connected (NC). It serves no electrical function and must remain unconnected on the PCB. This design allows shared SOT-23 footprint across multiple Zener variants while maintaining mechanical stability during reflow soldering.
How does the ESD rating of MMBZ5256ELT1G benefit circuit design?
The MMBZ5256ELT1G's Class 3 HBM rating (>16 kV) eliminates the need for discrete ESD protection components in many portable and handheld applications. This reduces bill-of-materials count, saves PCB area, and improves reliability by removing potential failure points in signal and power paths.
Can MMBZ5256ELT1G be used for voltage reference in ADC circuits?
Yes - the MMBZ5256ELT1G provides stable 30 V reference with low dynamic impedance (49 Ω) and minimal leakage (≤0.1 μA), making it suitable for mid-precision ADC reference buffers or overvoltage guardrails. For high-accuracy systems, pairing with a low-pass RC filter mitigates noise from Zener knee characteristics.
MMBZ5256ELT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 225 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:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBZ5256ELT1G FAQ
1.How can I place an order for MMBZ5256ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5256ELT1G 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 MMBZ5256ELT1G reliable?
The price and inventory of MMBZ5256ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5256ELT1G is usually 5 days.
3.What payment methods are accepted for MMBZ5256ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5256ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5256ELT1G?
MMBZ5256ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5256ELT1G 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 MMBZ5256ELT1G?
For technical support, including MMBZ5256ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5256ELT1G requirements.
6.How does Aetrix verify that MMBZ5256ELT1G is sourced from the original manufacturer or authorized distributors?
All MMBZ5256ELT1G 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 MMBZ5256ELT1G meets industry standards.
7.What is the process for return or replacement of MMBZ5256ELT1G?
All MMBZ5256ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5256ELT1G, 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 MMBZ5256ELT1G part is unused and in its original packaging.
Return procedure for MMBZ5256ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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