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onsemi MMBZ5239BLT1
- Part No.:
- MMBZ5239BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5239BLT1.pdf
- Description:
- DIODE ZENER 9.1V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:7,173
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Product details
Overview
MMBZ5239BLT1 from onsemi is a 225 mW surface-mount Zener diode in SOT-23 package, rated for 9.1 V nominal reverse breakdown voltage at 20 mA test current, with 600 Ω maximum dynamic impedance and 3 μA maximum leakage current at 7 V reverse bias. It provides precision voltage regulation in space-constrained portable electronics.
For engineers reviewing the MMBZ5239BLT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5.5%), thermal resistance (556 °C/W on FR-5 board), ESD robustness (>16 kV HBM), and Pb-free RoHS-compliant packaging for high-density PCB assembly.
Technical Context
This device operates as a two-terminal voltage reference using controlled avalanche and Zener breakdown mechanisms. Its 9.1 V nominal Zener voltage falls within the positive temperature coefficient range per onsemi's typical TC curve, ensuring stable regulation across −65°C to +150°C junction temperature.
The SOT-23 package features a defined pinout (Anode–NC–Cathode) with cathode polarity indicated by a band. It delivers 225 mW power dissipation on FR-5 board with 1.8 mW/°C derating above 25°C, and supports automated placement via optimized land pattern and solderability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 9.1 V @ 20 mA - defines regulated output voltage under standard test conditions |
| Zener Voltage Range | 8.64 V to 9.56 V - ±5.5% tolerance band for production yield and design margin |
| Dynamic Impedance | 600 Ω max @ 20 mA - limits output voltage variation under load current changes |
| Leakage Current | 3 μA max @ 7 V - ensures minimal standby power loss in low-current bias networks |
| Power Dissipation | 225 mW on FR-5 board - sets maximum continuous power handling at 25°C ambient |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct handling and assembly without special ESD controls |
| Junction Temperature | −65°C to +150°C - supports operation in automotive under-hood and industrial environments |
Pinout & Package
SOT-23 (TO-236) plastic surface-mount package, 2.90 mm × 1.30 mm × 1.00 mm body size, void-free thermosetting case with corrosion-resistant finish, UL 94 V-0 flammability rating, and cathode polarity marked by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward current entry / reverse bias reference node for Zener operation |
| 2 | No Connection | Internally unconnected terminal - must remain floating in PCB layout |
| 3 | Cathode | Reference output node; polarity band identifies this terminal on package |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW power rating on FR-5 board | Enables use in compact battery-powered devices without heatsinking |
| ESD robustness >16 kV HBM | Eliminates need for external ESD protection in handheld interface circuits |
| Pb-free, halogen-free, RoHS-compliant | Meets global environmental compliance requirements for consumer and industrial products |
| Small SOT-23 footprint | Supports ≥1000 components/in² PCB density in smartphones and wearables |
| Stable Zener voltage over −65°C to +150°C | Permits use in automotive cabin modules and industrial sensor nodes without derating |
Applications
| Portable Power Rail Clamping | Low-Power Reference Generation |
|---|---|
Use Scenario: Voltage clamping of 12 V supply rails in Bluetooth headsets to protect LDO inputs from transient spikes. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing surge energy above 9.1 V threshold. Use Value: Prevents LDO damage without adding series resistance or active circuitry, reducing BOM count by one component. |
Use Scenario: Generating stable 9.1 V reference for ADC biasing in medical glucose meters with single-cell Li-ion supply. IC Role / Device Role / Timing Role: Passive voltage reference source with predictable TC behavior across operating temperature. Use Value: Enables <±0.5% full-scale accuracy in 12-bit ADC conversions without trimming or calibration. |
| ESD-Sensitive Interface Protection | High-Density Board Voltage Monitoring |
Use Scenario: Protecting USB data lines in smartwatches against contact ESD events during user handling. IC Role / Device Role / Timing Role: Fast-response shunt clamp activated at 9.1 V to divert >16 kV HBM pulses. Use Value: Achieves IEC 61000-4-2 Level 4 compliance without increasing trace length or compromising signal integrity. |
Use Scenario: Monitoring 9 V rail health in IoT edge gateways using microcontroller ADC with internal reference. IC Role / Device Role / Timing Role: Precision voltage divider top element providing known ratio against GND. Use Value: Delivers ±1% rail measurement accuracy over temperature, enabling predictive power failure alerts. |
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-C9V1 | Same 9.1 V nominal Zener voltage but 300 mW rating and higher ZZT (1000 Ω max) | Higher power handling suits higher-current clamping; less suitable for ultra-low-leakage bias networks | Select when >225 mW dissipation or lower-cost legacy sourcing is required |
| MMBZ5239BS | Identical electrical specs but in SOD-123 package (larger footprint, 500 mW rating) | Offers better thermal performance in thermally constrained layouts but occupies 3× more board area | Select when board-level thermal management is prioritized over miniaturization |
Compared with BZX84-C9V1 and MMBZ5239BS, the MMBZ5239BLT1 uniquely balances ultra-small SOT-23 size, 225 mW FR-5 rating, and 3 μA leakage - making it optimal for space-limited, battery-sensitive designs where thermal mass is not available.
Availability
MMBZ5239BLT1 is available at Aetrix Electronics and suitable for portable power rail clamping, low-power reference generation, ESD-sensitive interface protection, and high-density board voltage monitoring requiring stable component supply and full RoHS compliance.
Supply support for MMBZ5239BLT1 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 silicon solutions for automotive, industrial, cloud, and IoT applications, with focus on performance, reliability, and sustainability.
The MMBZ52xxBLT1G series was designed specifically for high-density portable electronics requiring miniature, robust, and environmentally compliant Zener regulation - targeting cellular phones, wearables, and handheld medical devices.
FAQ
What is the exact Zener voltage tolerance for MMBZ5239BLT1?
The MMBZ5239BLT1 has a nominal Zener voltage of 9.1 V with minimum 8.64 V and maximum 9.56 V values at 20 mA test current, corresponding to a ±5.5% tolerance band. This specification is measured per onsemi's standard test conditions at 25°C ambient and is validated across production lots per the published Electrical Characteristics table.
Does MMBZ5239BLT1 have a functional pin 2 connection?
No, pin 2 of the MMBZ5239BLT1 is internally not connected (NC). The device uses only pins 1 (Anode) and 3 (Cathode) for operation. PCB layout must leave pin 2 unconnected - routing traces or placing solder paste on this pad may cause assembly defects or electrical shorts.
Can MMBZ5239BLT1 be used in automotive applications?
The standard MMBZ5239BLT1 is not AEC-Q101 qualified. For automotive use, the SZMMBZ5239BLT1G variant - which shares identical electrical specs but includes AEC-Q101 qualification, PPAP capability, and unique site control - must be selected. The "SZ" prefix denotes automotive-grade manufacturing and traceability.
What is the maximum allowable junction temperature for MMBZ5239BLT1?
The MMBZ5239BLT1 has a specified junction and storage temperature range of −65°C to +150°C. Operation beyond +150°C risks permanent parametric shift or catastrophic failure. Derating must be applied above 25°C ambient per the 1.8 mW/°C slope to maintain safe junction temperature under load.
How does the ESD rating of MMBZ5239BLT1 impact system-level design?
The MMBZ5239BLT1's Class 3 Human Body Model rating (>16 kV) allows it to absorb common ESD events without external protection components. In practice, this simplifies front-end interface design for USB, button inputs, or sensor lines in consumer portables - reducing layout complexity and eliminating discrete TVS diodes in many cases.
MMBZ5239BLT1 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):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 7 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)
MMBZ5239BLT1 FAQ
1.How can I place an order for MMBZ5239BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5239BLT1 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 MMBZ5239BLT1 reliable?
The price and inventory of MMBZ5239BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5239BLT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5239BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5239BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5239BLT1?
MMBZ5239BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5239BLT1 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 MMBZ5239BLT1?
For technical support, including MMBZ5239BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5239BLT1 requirements.
6.How does Aetrix verify that MMBZ5239BLT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5239BLT1 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 MMBZ5239BLT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5239BLT1?
All MMBZ5239BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5239BLT1, 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 MMBZ5239BLT1 part is unused and in its original packaging.
Return procedure for MMBZ5239BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5239BLT1 Tags
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BZT52C5V6T-7
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BZX84C3V3LT1G
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MM5Z5V1ST1G
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