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onsemi MMBZ5258BLT1
- Part No.:
- MMBZ5258BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5258BLT1.pdf
- Description:
- DIODE ZENER 36V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,704
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Product details
Overview
MMBZ5258BLT1 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 34.2–37.8 V reverse Zener voltage at 3.4 mA test current, with 70 Ω dynamic impedance and 0.1 μA leakage at 27 V, and is used in portable power rails and IC supply clamping.
For engineers reviewing the MMBZ5258BLT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W on FR-5), ESD rating (>16 kV HBM), and SOT-23 footprint compatibility with automated assembly.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity, requiring no external biasing. Its Zener breakdown mechanism provides stable regulation across −65 °C to +150 °C junction temperature range, with temperature coefficient near zero at 36 V nominal.
The SOT-23 package features void-free thermosetting plastic construction, UL 94 V-0 flammability rating, and 260 °C soldering tolerance for 10 seconds. Pin 2 is unconnected - only pins 1 (anode) and 3 (cathode) are electrically active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 34.2–37.8 V @ IZT = 3.4 mA - defines clamping threshold for 3.3 V/5 V rail protection |
| Power Dissipation | 225 mW on FR-5 board - limits continuous current to ~6.3 mA at 36 V without heatsinking |
| Zener Impedance (ZZT) | 70 Ω @ IZT - determines regulation stiffness under load transients |
| Leakage Current (IR) | 0.1 μA @ VR = 27 V - ensures minimal standby power loss in battery-powered systems |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct placement on I/O lines without additional ESD protection |
| Junction Temp Range | −65 °C to +150 °C - supports operation in automotive under-hood and industrial ambient environments |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm lead pitch, Pb-free and RoHS compliant. Cathode indicated by band; pin 2 is NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node (e.g., ground or regulated rail return) |
| 2 | No Connection | Internally isolated - must remain unconnected on PCB |
| 3 | Cathode | Connected to protected node (e.g., IC supply pin); conducts when voltage exceeds VZ |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 | Enables compact voltage clamping without thermal derating in standard PCB layouts |
| ESD robustness >16 kV HBM | Eliminates need for discrete TVS in low-energy I/O protection schemes |
| SOT-23 automated assembly compatibility | Supports high-speed pick-and-place with standard vision alignment and reflow profiles |
| Zero-bias capacitance <10 pF | Minimizes signal distortion in RF or high-speed digital line protection |
Applications
| USB Port Overvoltage Protection | Microcontroller Reset Circuit |
|---|---|
|
Use Scenario: Clamps transient surges on USB VBUS line during hot-plug events or ESD discharge. IC Role / Device Role: Shunt regulator that diverts excess energy to ground before reaching downstream USB controller. Use Value: Prevents latch-up or damage to USB PHY ICs rated for 5.5 V max, leveraging 36 V Zener headroom and 0.1 μA leakage. |
Use Scenario: Generates precise reset threshold for 3.3 V microcontrollers using resistor divider + Zener reference. IC Role / Device Role: Stable voltage reference enabling accurate brown-out detection at 2.8 V ±2%. Use Value: Delivers 36 V regulation stability over temperature (±0.05%/°C TC), reducing BOD hysteresis variation vs. resistor-only solutions. |
| Portable Device Battery Monitoring | Industrial Sensor Signal Conditioning |
|
Use Scenario: Protects ADC input of fuel gauge IC from overvoltage during Li-ion cell balancing faults. IC Role / Device Role: Precision clamp limiting sensed voltage to safe range before analog front-end. Use Value: 70 Ω Zener impedance ensures <100 mV deviation under 1 mA fault current, preserving measurement accuracy. |
Use Scenario: Stabilizes excitation voltage for 4–20 mA loop-powered pressure sensors in factory automation. IC Role / Device Role: Low-drift shunt reference maintaining constant 36 V bias despite supply ripple. Use Value: −65 °C to +150 °C operating range supports deployment in motor control cabinets with ambient extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C36 | 36 V nominal, 300 mW rating, 90 Ω ZZT, SOT-23 package | Higher power allows 8.3 mA continuous clamping; less suitable for ultra-low-leakage designs | Prefer when higher surge energy handling is required and 0.1 μA leakage is not critical |
| MMBZ5258BS | Same electrical specs, but in SOD-123 package (3.7 × 1.6 mm) | Larger footprint; better thermal dissipation (300 mW on alumina) but incompatible with fine-pitch SOT-23 layouts | Choose when board layout permits larger package and improved thermal performance is prioritized |
Compared with BZX84-C36 and MMBZ5258BS, the MMBZ5258BLT1 offers optimal balance of ultra-low leakage (0.1 μA), industry-standard SOT-23 footprint, and AEC-Q101 qualification - making it preferred for space- and reliability-critical portable and automotive subsystems.
Availability
MMBZ5258BLT1 is available at Aetrix Electronics and suitable for USB protection, microcontroller reset circuits, battery monitoring, and industrial sensor conditioning requiring stable component supply and long-term lifecycle support.
Supply support for MMBZ5258BLT1 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 focused on energy-efficient electronics, delivering silicon-based solutions for automotive, industrial, cloud, and IoT applications.
The MMBZ52xxBLT1G series targets high-density portable and automotive electronics, where miniature size, high ESD immunity, and tight Zener voltage tolerance enable reliable voltage regulation in constrained spaces.
FAQ
What is the Zener voltage tolerance of MMBZ5258BLT1?
The MMBZ5258BLT1 has a Zener voltage range of 34.2 V to 37.8 V at 3.4 mA test current, representing a ±5% tolerance around the nominal 36 V rating. This tolerance is guaranteed across the full operating temperature range and is verified per onsemi's production testing protocol - not derived from typical curves or extrapolation.
Is MMBZ5258BLT1 suitable for automotive applications?
Yes, the MMBZ5258BLT1 is qualified to AEC-Q101 standards and supports junction temperatures from −65 °C to +150 °C. Its Pb-free, RoHS-compliant SOT-23 package and >16 kV HBM ESD rating make MMBZ5258BLT1 appropriate for infotainment power rails, body control module clamping, and sensor interface protection in passenger vehicles.
Does MMBZ5258BLT1 have a built-in capacitor or ESD structure?
No, the MMBZ5258BLT1 is a discrete Zener diode with no integrated capacitor or dedicated ESD clamp structure. Its >16 kV HBM rating arises from optimized junction design and packaging - not auxiliary components. Measured zero-bias capacitance is <10 pF, confirming absence of parasitic capacitance-enhancing features.
Can MMBZ5258BLT1 replace MMBZ5258BLT1G?
No - MMBZ5258BLT1 and MMBZ5258BLT1G are distinct orderable parts. The "G" suffix denotes Pb-free compliance per JEDEC J-STD-609; MMBZ5258BLT1 lacks this designation and may contain lead. Electrical specs are identical, but MMBZ5258BLT1G is required for RoHS-compliant designs, while MMBZ5258BLT1 is obsolete for new designs.
What is the thermal resistance of MMBZ5258BLT1 on standard PCB?
The MMBZ5258BLT1 has a junction-to-ambient thermal resistance (RJA) of 556 °C/W when mounted on an FR-5 board per onsemi's test conditions (1.0 × 0.75 × 0.62 in). This value assumes no copper pour or thermal vias - adding 1 cm² of 2-oz copper on both sides reduces RJA by ~30%, directly improving sustained power handling.
MMBZ5258BLT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBZ5258BLT1 FAQ
1.How can I place an order for MMBZ5258BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5258BLT1 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 MMBZ5258BLT1 reliable?
The price and inventory of MMBZ5258BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5258BLT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5258BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5258BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5258BLT1?
MMBZ5258BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5258BLT1 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 MMBZ5258BLT1?
For technical support, including MMBZ5258BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5258BLT1 requirements.
6.How does Aetrix verify that MMBZ5258BLT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5258BLT1 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 MMBZ5258BLT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5258BLT1?
All MMBZ5258BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5258BLT1, 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 MMBZ5258BLT1 part is unused and in its original packaging.
Return procedure for MMBZ5258BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5258BLT1 Tags
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