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onsemi SZMMBZ5256ELT1G
- Part No.:
- SZMMBZ5256ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5256ELT1G.pdf
- Description:
- DIODE ZENER 30V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SZMMBZ5256ELT1G from onsemi is a 30 V ±5% Zener voltage regulator 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 compact DC power rails.
For engineers reviewing the SZMMBZ5256ELT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (556 °C/W on FR-5), AEC-Q101 qualification, ESD robustness (>16 kV HBM), and automotive-grade traceability per PPAP requirements.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable 30 V output by conducting reverse current above its breakdown threshold. Its 49 Ω Zener impedance at 4.2 mA ensures low voltage deviation under load transients, while the −65°C to +150°C junction temperature range supports operation in harsh environments.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode) and Pb-free construction compliant with RoHS. It delivers 225 W peak pulse power (8 × 20 µs), enabling transient suppression in automotive and portable electronics without external clamping circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 28.5 V min / 30 V nominal / 31.5 V max at IZT = 4.2 mA - defines regulated voltage window for feedback or clamp circuits. |
| Power Dissipation (PD) | 225 mW on FR-5 board at TA = 25°C - sets maximum continuous DC power handling before thermal derating applies. |
| Zener Impedance (ZZT) | 49 Ω at IZT = 4.2 mA - determines output voltage stability under varying load current conditions. |
| Leakage Current (IR) | 0.1 μA at VR = 23 V - ensures minimal quiescent current draw in standby or battery-powered systems. |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - provides robustness against electrostatic discharge during assembly and field use. |
| Junction Temp Range | −65°C to +150°C - enables deployment in under-hood automotive, industrial control, and outdoor embedded applications. |
| AEC-Q101 Qualified | Yes - certifies reliability for automotive electronic modules requiring PPAP documentation and process control. |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 mm × 1.30 mm × 1.00 mm body size, void-free thermosetting plastic case with corrosion-resistant finish and UL 94 V-0 flammability rating. Cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node (e.g., ground or return path) in shunt regulation configuration. |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required. |
| Pin 3 | Cathode | Connected to regulated voltage node; conducts reverse current when VIN exceeds VZ. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive Qualification | AEC-Q101 qualified with PPAP capability - meets stringent automotive reliability and traceability requirements. |
| Pb-Free Construction | RoHS-compliant "G" suffix package - supports lead-free reflow soldering and environmental compliance programs. |
| High ESD Robustness | Class 3 HBM (>16 kV) - eliminates need for external ESD protection in handheld and interface circuits. |
| Peak Pulse Power | 225 W (8 × 20 µs) - absorbs transient surges without failure in power supply input stages. |
| Thermal Performance | 556 °C/W junction-to-ambient on FR-5 - enables reliable operation at elevated ambient temperatures with minimal heatsinking. |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for microcontroller ADC inputs in door module ECUs exposed to load dump events. IC Role / Device Role / Timing Role: Shunt voltage reference and transient clamp protecting analog front-end from 12 V rail spikes up to 40 V. Use Value: Maintains 30 V regulation tolerance (±5%) across −40°C to +125°C ambient, ensuring consistent ADC accuracy without external compensation. |
Use Scenario: Providing stable bias voltage for 4–20 mA transmitter ICs in factory automation pressure sensors. IC Role / Device Role / Timing Role: Precision Zener reference source replacing larger through-hole devices in space-constrained sensor PCBs. Use Value: Delivers <0.1 μA leakage at 23 V, minimizing error contribution to current-loop calibration and extending battery life in wireless variants. |
| Portable Medical Monitor Power Rail | 5G Small Cell Baseband Reference |
Use Scenario: Clamping and regulating auxiliary 3.3 V LDO input in battery-powered ECG front-end to prevent overvoltage damage. IC Role / Device Role / Timing Role: Low-impedance shunt regulator absorbing ESD events and line transients during clinical handling. Use Value: Withstands >16 kV HBM ESD and maintains 49 Ω Zener impedance, preserving signal integrity in low-noise analog acquisition paths. |
Use Scenario: Stabilizing local 30 V bias for RF power amplifier bias control circuitry in compact 5G mmWave small cell radios. IC Role / Device Role / Timing Role: High-stability voltage reference enabling precise PA gain setting across temperature and aging. Use Value: Achieves ±5% VZ tolerance and −65°C to +150°C operation, supporting extended thermal cycling in outdoor deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C30LT1G | 30 V nominal, ±5% tolerance, 350 mW PD, 70 Ω ZZT @ 5 mA - higher power but higher impedance. | Preferred where higher continuous power margin is needed, but less suitable for low-noise references due to higher ZZT. | Select BZX84-C30LT1G only if board layout allows larger thermal relief or if 350 mW headroom justifies trade-off in regulation precision. |
| MMSZ5256ET1G | 30 V nominal, ±5%, 500 mW PD, 40 Ω ZZT @ 20 mA - higher power and lower impedance, but not AEC-Q101 qualified. | Used in commercial/industrial power supplies where automotive qualification is unnecessary and tighter regulation is prioritized. | Choose MMSZ5256ET1G for non-automotive designs needing improved regulation stability, but verify lifecycle support and sourcing continuity separately. |
Compared with BZX84-C30LT1G and MMSZ5256ET1G, SZMMBZ5256ELT1G uniquely combines AEC-Q101 qualification, 225 mW SOT-23 footprint, and 49 Ω impedance - making it the only option meeting automotive PPAP, space constraints, and mid-precision regulation simultaneously.
Availability
SZMMBZ5256ELT1G is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor transmitters, portable medical monitors, and 5G small cell baseband circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZMMBZ5256ELT1G 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 (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMMBZ5256ELT1G belongs to the SZMMBZ52xxELT1G series - engineered specifically for automotive-grade voltage regulation and transient suppression in space-constrained, high-reliability electronic control units.
FAQ
What is the Zener voltage tolerance of SZMMBZ5256ELT1G?
The SZMMBZ5256ELT1G has a Zener voltage specification of 28.5 V minimum, 30 V nominal, and 31.5 V maximum at IZT = 4.2 mA - corresponding to a ±5% tolerance around the nominal value. This tight tolerance ensures predictable regulation behavior in feedback loops and reference circuits across manufacturing lots and temperature ranges.
Is SZMMBZ5256ELT1G suitable for automotive applications?
Yes, SZMMBZ5256ELT1G is AEC-Q101 qualified and PPAP capable, with full traceability and process controls required for automotive electronics. Its −65°C to +150°C operating range, 225 W peak pulse rating, and Class 3 ESD immunity make it appropriate for body control modules, infotainment power rails, and ADAS sensor interfaces.
What is the thermal resistance of SZMMBZ5256ELT1G on standard PCB?
The thermal resistance junction-to-ambient (RJA) for SZMMBZ5256ELT1G is 556 °C/W when mounted on an FR-5 board. This value assumes standard JEDEC test conditions and informs thermal design margins - for example, at 225 mW dissipation, junction temperature rise above ambient is approximately 125°C, requiring careful layout and ambient temperature management.
Does SZMMBZ5256ELT1G have a no-connect pin, and how should it be handled on PCB?
Yes, SZMMBZ5256ELT1G has Pin 2 designated as "No Connection" per the official datasheet pinout. This terminal is internally unconnected and must remain electrically floating - no PCB trace, pad, or thermal relief should be attached to Pin 2 to avoid unintended coupling or mechanical stress on the bond wire.
How does the leakage current of SZMMBZ5256ELT1G compare to similar 30 V Zeners?
SZMMBZ5256ELT1G specifies 0.1 μA maximum reverse leakage current at 23 V (80% of VZ nominal), which is competitive with industry-standard 30 V Zeners. This low leakage minimizes error in high-impedance reference nodes and extends battery life in always-on portable systems - verified per onsemi's Electrical Characteristics table on page 3 of the datasheet.
SZMMBZ5256ELT1G 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:
- -
- 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:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZMMBZ5256ELT1G FAQ
1.How can I place an order for SZMMBZ5256ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5256ELT1G 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 SZMMBZ5256ELT1G reliable?
The price and inventory of SZMMBZ5256ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5256ELT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5256ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5256ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5256ELT1G?
SZMMBZ5256ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5256ELT1G 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 SZMMBZ5256ELT1G?
For technical support, including SZMMBZ5256ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5256ELT1G requirements.
6.How does Aetrix verify that SZMMBZ5256ELT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5256ELT1G 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 SZMMBZ5256ELT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5256ELT1G?
All SZMMBZ5256ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5256ELT1G, 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 SZMMBZ5256ELT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5256ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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