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onsemi MMBZ5258BLT1G
- Part No.:
- MMBZ5258BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5258BLT1G.pdf
- Description:
- DIODE ZENER 36V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,362
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Product details
Overview
MMBZ5258BLT1G from onsemi is a 36 V, 225 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and overvoltage protection in space-constrained circuits. It delivers ±5% nominal Zener voltage tolerance at 3.4 mA test current, exhibits 70 Ω dynamic impedance at IZT, and supports operation from −65°C to +150°C. It is used in power supply feedback loops, voltage reference circuits, and ESD-sensitive portable electronics.
For engineers reviewing the MMBZ5258BLT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 36 V nominal Zener voltage, 225 mW FR-4 board power rating, 70 Ω Zener impedance at 3.4 mA, Class 3 (＞16 kV) HBM ESD rating, and SOT-23 pin-compatible footprint with anode–NC–cathode terminal configuration.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its 36 V nominal Zener voltage places it in the medium-voltage range where temperature coefficient is near zero (≈+2.5 mV/°C per datasheet Figure 1), minimizing drift across industrial temperature ranges. The 225 mW power rating is specified on FR-5 board at 25°C with 1.8 mW/°C derating above ambient.
The SOT-23 package features a defined pinout: Pin 1 = Anode, Pin 2 = No Connection, Pin 3 = Cathode - confirmed by mechanical outline Style 8 and Electrical Characteristics table. Its 0.25 μA leakage current at 27 V reverse bias ensures low standby power loss in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 36 V at 3.4 mA test current - sets stable reference point for feedback or clamping at mid-range voltage levels |
| Power Dissipation | 225 mW on FR-5 board at 25°C - defines maximum continuous power handling in standard PCB layouts |
| Zener Impedance | 70 Ω at IZT = 3.4 mA - determines output voltage stability under varying load current |
| Leakage Current | 0.25 μA at VR = 27 V - ensures minimal quiescent current draw in high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV) per HBM - provides robustness against electrostatic discharge during assembly and field use |
| Operating Temperature | −65°C to +150°C - enables deployment in automotive under-hood, industrial control, and outdoor embedded systems |
| Package | SOT-23 (TO-236), 2.90 × 1.30 × 1.00 mm - supports automated placement and high-density PCB routing |
Pinout & Package
SOT-23 plastic surface-mount package with void-free thermosetting case, corrosion-resistant finish, and UL 94 V-0 flammability rating. Maximum soldering temperature is 260°C for 10 seconds. Polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node in reverse-bias regulation or clamping configuration |
| Pin 2 | No Connection | Internally unconnected - must remain floating; no PCB trace or pad required |
| Pin 3 | Cathode | Connected to higher-potential node; polarity band identifies this terminal for correct orientation |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free, Halogen Free/BFR Free | RoHS-compliant construction meets global environmental compliance requirements without performance trade-offs |
| Optimized for Automated Assembly | SOT-23 footprint and marking design support high-yield pick-and-place and reflow processes |
| Low-Leakage Regulation | 0.25 μA IR at 27 V enables use in micropower reference designs and battery-backed circuits |
| Stable Mid-Voltage Reference | +2.5 mV/°C tempco near 36 V minimizes voltage drift across −55°C to +150°C operating range |
| High-Density Packaging | 2.90 × 1.30 mm footprint allows integration into compact mobile and IoT PCBs without thermal compromise |
Applications
| Power Supply Feedback | Portable Device Protection |
|---|---|
|
Use Scenario: Regulating output voltage of DC-DC converters via optocoupler feedback loop. IC Role / Device Role / Timing Role: Zener diode acts as precision shunt reference, setting threshold for TL431 or similar error amplifier. Use Value: 36 V nominal voltage and 70 Ω impedance ensure tight regulation accuracy and fast transient response under load variation. |
Use Scenario: Clamping surge transients on USB or audio interface lines in smartphones and wearables. IC Role / Device Role / Timing Role: Shunt protector limiting voltage spikes to safe levels before reaching sensitive analog front-end ICs. Use Value: 16 kV HBM ESD rating and 0.25 μA leakage preserve signal integrity while surviving repeated ESD events. |
| Battery Management Reference | Industrial Sensor Signal Conditioning |
|
Use Scenario: Providing stable reference for ADC input scaling in Li-ion battery fuel gauges. IC Role / Device Role / Timing Role: Voltage reference source for ratiometric measurement of cell voltage against known Zener potential. Use Value: −65°C to +150°C operating range and low tempco ensure accuracy across wide ambient and battery temperature excursions. |
Use Scenario: Biasing and protecting bridge sensor outputs in factory automation pressure/temperature transmitters. IC Role / Device Role / Timing Role: Dual-role device: establishes bias point and clamps EMI-induced overvoltage on low-level mV signals. Use Value: SOT-23 size fits dense sensor module layouts; NC pin simplifies layout with no stub trace needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C36LT1G | Same 36 V nominal Zener, but 300 mW rating on FR-4 and 60 Ω ZZT; slightly higher leakage (0.5 μA @ 28.8 V) | Better power handling for higher-current references; less suitable for ultra-low-leakage bias networks | Select when >225 mW dissipation margin is required and leakage <0.25 μA is not critical |
| MMBZ5258BS | Same electrical specs, but in SOD-123 package (3.7 × 1.6 mm); no NC pin - 2-terminal configuration | Larger footprint and manual assembly compatibility; lacks SOT-23's automated placement optimization | Select when board real estate allows larger package and NC-pin routing complexity must be avoided |
Compared with BZX84-C36LT1G and MMBZ5258BS, the MMBZ5258BLT1G uniquely balances SOT-23 miniaturization, NC-pin isolation for noise-sensitive nodes, and industry-leading 16 kV HBM ESD rating - making it optimal for high-density, ESD-prone portable and industrial designs.
Availability
MMBZ5258BLT1G is available at Aetrix Electronics and suitable for power supply feedback, portable device protection, battery management reference, and industrial sensor signal conditioning requiring stable component supply, RoHS compliance, and SOT-23 surface-mount compatibility.
Supply support for MMBZ5258BLT1G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ52xxBLT1G series is part of onsemi's precision Zener regulator portfolio, engineered specifically for space-constrained, high-reliability voltage reference and overvoltage protection in portable and industrial electronics.
FAQ
What is the Zener voltage tolerance for MMBZ5258BLT1G?
The MMBZ5258BLT1G has a nominal Zener voltage of 36 V with a tolerance of ±5%, meaning the actual measured voltage at 3.4 mA test current falls between 34.2 V and 37.8 V. This tolerance is guaranteed across the full operating temperature range and is verified per onsemi's production testing protocol.
Does MMBZ5258BLT1G have a functional pin 2 connection?
No, MMBZ5258BLT1G Pin 2 is internally not connected (NC). Per onsemi's mechanical outline Style 8 and Electrical Characteristics table, only Pins 1 (Anode) and 3 (Cathode) are electrically active. PCB layout must leave Pin 2 unconnected - no trace or thermal pad should be attached to it.
What is the maximum power dissipation of MMBZ5258BLT1G on an alumina substrate?
On a 0.4 × 0.3 × 0.024 inch 99.5% alumina substrate, the MMBZ5258BLT1G supports 300 mW at 25°C, derated at 2.4 mW/°C above ambient. This higher rating reflects superior thermal conductivity versus FR-5 boards, enabling use in thermally demanding industrial modules.
Is MMBZ5258BLT1G suitable for automotive applications?
The standard MMBZ5258BLT1G is not AEC-Q101 qualified. For automotive use, the SZMMBZ5258BLT1G variant - which shares identical electrical specs but includes PPAP-capable manufacturing and site-specific controls - must be selected. Always verify qualification status via official onsemi documentation before automotive deployment.
How does the temperature coefficient of MMBZ5258BLT1G affect voltage stability?
At its 36 V nominal Zener voltage, the MMBZ5258BLT1G exhibits a temperature coefficient of approximately +2.5 mV/°C (per Figure 1), resulting in ~±0.375 V drift over a −55°C to +150°C range. This low drift supports stable reference performance in unregulated environments without external compensation.
MMBZ5258BLT1G 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):
- 36 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 27 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-23-3 (TO-236)
MMBZ5258BLT1G FAQ
1.How can I place an order for MMBZ5258BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5258BLT1G 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 MMBZ5258BLT1G reliable?
The price and inventory of MMBZ5258BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5258BLT1G is usually 5 days.
3.What payment methods are accepted for MMBZ5258BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5258BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5258BLT1G?
MMBZ5258BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5258BLT1G 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 MMBZ5258BLT1G?
For technical support, including MMBZ5258BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5258BLT1G requirements.
6.How does Aetrix verify that MMBZ5258BLT1G is sourced from the original manufacturer or authorized distributors?
All MMBZ5258BLT1G 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 MMBZ5258BLT1G meets industry standards.
7.What is the process for return or replacement of MMBZ5258BLT1G?
All MMBZ5258BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5258BLT1G, 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 MMBZ5258BLT1G part is unused and in its original packaging.
Return procedure for MMBZ5258BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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