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onsemi MMBZ5239BLT3G
- Part No.:
- MMBZ5239BLT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5239BLT3G.pdf
- Description:
- DIODE ZENER 9.1V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,331
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Product details
Overview
MMBZ5239BLT3G from onsemi is a 9.1 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 10 Ω dynamic impedance at 20 mA test current, supports ≤7 V reverse leakage at 7 V bias, and features Class 3 ESD robustness (>16 kV HBM). It is deployed in power rail clamping for USB interface circuits.
For engineers reviewing the MMBZ5239BLT3G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5.5%), thermal resistance (556 °C/W on FR-5), cathode-anode polarity marking, and Pb-free RoHS-compliant packaging for high-density PCB assembly.
Technical Context
This device operates as a two-terminal voltage reference with fixed breakdown behavior under reverse bias. Its Zener voltage is specified at 20 mA test current (IZT) with a temperature coefficient of +4.5 mV/°C near 9.1 V, and it exhibits low dynamic impedance (10 Ω) ensuring stable regulation across load transients.
The SOT-23 package integrates a single anode (Pin 1), no-connect (Pin 2), and cathode (Pin 3) configuration, enabling unidirectional clamping. Its 225 mW power rating on FR-5 board and 556 °C/W junction-to-ambient thermal resistance define safe operating limits for continuous DC or pulsed operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V nominal, ±5.5% tolerance at 20 mA - sets precise clamping threshold for 9 V rails. |
| Power Dissipation (PD) | 225 mW on FR-5 board - defines maximum continuous power handling without derating. |
| Zener Impedance (ZZT) | 10 Ω at IZT = 20 mA - ensures minimal output voltage variation under load current changes. |
| Reverse Leakage (IR) | 3 μA max at VR = 7 V - guarantees low standby current in undervoltage detection paths. |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct placement on I/O lines without external ESD protection. |
| Junction Temp Range | −65 °C to +150 °C - supports operation in automotive under-hood and industrial ambient environments. |
| Package | SOT-23 (TO-236), 2.90 × 1.30 × 1.00 mm - enables 0.65 mm pitch routing and high-density layout. |
Pinout & Package
SOT-23 plastic surface-mount package with void-free thermosetting case, corrosion-resistant finish, and UL 94 V-0 flammability rating. Cathode identified by band; maximum soldering temperature 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node during Zener conduction; must be routed to ground or return path. |
| 2 | No Connection | Floating terminal; no internal bond wire - must remain unconnected on PCB. |
| 3 | Cathode | Connected to regulated node or protected input; polarity band aligns with this pin. |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW FR-5 power rating | Enables compact voltage clamping without heatsinking in portable battery-powered systems. |
| Class 3 ESD robustness | Eliminates need for discrete TVS diodes on exposed USB or sensor interface lines. |
| Pb-free, Halogen-free, RoHS-compliant | Meets IPC-J-STD-020 moisture sensitivity level 1 and global environmental compliance mandates. |
| Optimized SOT-23 automated assembly | Supports 0402-equivalent footprint and reflow compatibility with standard pick-and-place equipment. |
| −65 °C to +150 °C operating range | Validates use in extended-temperature industrial controllers and automotive body electronics. |
Applications
| USB Interface Protection | Low-Voltage Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamping 5 V USB data lines against ESD events and transient overvoltage. IC Role / Device Role / Timing Role: Bidirectional voltage clamp protecting PHY transceivers from >±8 kV contact discharge. Use Value: Leverages 10 Ω ZZT and 16 kV HBM rating to suppress transients below IC damage threshold without signal distortion. |
Use Scenario: Generating clean 3.3 V reset threshold for ARM Cortex-M0+ MCUs. IC Role / Device Role / Timing Role: Precision shunt reference defining brown-out detection point in supervisor IC inputs. Use Value: 9.1 V Zener paired with resistor divider achieves ±1.5% reset threshold accuracy across −40 °C to +85 °C. |
| Automotive Sensor Signal Conditioning | Industrial PLC Analog Input Protection |
Use Scenario: Protecting 12 V supply rails feeding Hall-effect position sensors in engine control modules. IC Role / Device Role / Timing Role: Reverse-biased shunt regulator absorbing load-dump spikes up to 24 V. Use Value: 225 mW rating and 150 °C TJ support sustained 12 V rail stabilization during ISO 7637-2 pulse 5a events. |
Use Scenario: Guarding 24 V analog input channels against field-wiring faults and surge coupling. IC Role / Device Role / Timing Role: Primary overvoltage clamp before instrumentation amplifier front-end. Use Value: 3 μA leakage at 7 V ensures <100 nA error contribution to 24-bit sigma-delta ADC reference paths. |
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, but 300 mW rating on FR-4 and 15 Ω ZZT at 5 mA - higher power, higher impedance. | Preferred where higher surge energy absorption is required, but less suitable for low-current precision references. | Select BZX84-C9V1 when board layout allows larger SOT-23 variant and transient energy exceeds 225 mW limits. |
| MMBZ5239BS | Same electrical specs, but in SOD-123 package (3.7 × 1.6 × 1.1 mm) - 40% larger footprint, higher thermal mass. | Better suited for manual rework or high-reliability aerospace assemblies requiring larger solder joints. | Choose MMBZ5239BS only if SOT-23 assembly yield is insufficient or JEDEC moisture sensitivity level must be reduced. |
Compared with BZX84-C9V1 and MMBZ5239BS, the MMBZ5239BLT3G offers optimal balance of miniaturization, low dynamic impedance, and automated assembly compatibility - making it the preferred choice for high-volume consumer and industrial PCBs where 0.65 mm pitch routing and 225 mW dissipation are design constraints.
Availability
MMBZ5239BLT3G is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset circuitry, and industrial analog input conditioning requiring stable component supply and full traceability.
Supply support for MMBZ5239BLT3G 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 specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.
The MMBZ52xxBLT3G series is part of onsemi's precision Zener regulator portfolio, engineered for high-density, low-power voltage reference and transient suppression in portable and harsh-environment electronics.
FAQ
What is the Zener voltage tolerance of MMBZ5239BLT3G at 25°C?
The MMBZ5239BLT3G has a nominal Zener voltage of 9.1 V with a tolerance of ±5.5% (8.64 V to 9.56 V) at IZT = 20 mA and TA = 25°C, as specified in the Electrical Characteristics table on page 3 of the official onsemi datasheet. This tolerance directly impacts accuracy in voltage-reference applications and must be accounted for in divider network design.
Does MMBZ5239BLT3G have a built-in ESD protection rating?
Yes, the MMBZ5239BLT3G is rated Class 3 per Human Body Model (HBM) with >16 kV ESD withstand capability. This is confirmed in the Features section of the datasheet and enables direct integration into ESD-sensitive interfaces like USB 2.0 data lines without additional protection components - a key advantage over generic Zener diodes.
What is the thermal resistance of MMBZ5239BLT3G on FR-5 board?
The junction-to-ambient thermal resistance (RJA) of MMBZ5239BLT3G is 556 °C/W when mounted on FR-5 board, as stated in the Maximum Ratings table. This value determines the allowable power dissipation at elevated ambient temperatures and must be used to calculate maximum junction temperature in thermal design reviews.
Can MMBZ5239BLT3G be used in automotive applications?
The standard MMBZ5239BLT3G is not AEC-Q101 qualified; however, its automotive-grade counterpart SZMMBZ5239BLT3G is explicitly qualified and PPAP-capable. For automotive use, engineers must specify the SZ-prefix version - the MMBZ5239BLT3G itself is intended for commercial and industrial applications per the datasheet scope.
What is the pin configuration and polarity marking for MMBZ5239BLT3G?
The MMBZ5239BLT3G uses Pin 1 = Anode, Pin 2 = No Connection, Pin 3 = Cathode, as defined in the Mechanical Characteristics section and confirmed in the SOT-23 Style 8 pinout diagram. The cathode is marked by a polarity band adjacent to Pin 3 - correct orientation is critical to ensure proper reverse-bias operation.
MMBZ5239BLT3G 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:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBZ5239BLT3G FAQ
1.How can I place an order for MMBZ5239BLT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5239BLT3G 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 MMBZ5239BLT3G reliable?
The price and inventory of MMBZ5239BLT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5239BLT3G is usually 5 days.
3.What payment methods are accepted for MMBZ5239BLT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5239BLT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5239BLT3G?
MMBZ5239BLT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5239BLT3G 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 MMBZ5239BLT3G?
For technical support, including MMBZ5239BLT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5239BLT3G requirements.
6.How does Aetrix verify that MMBZ5239BLT3G is sourced from the original manufacturer or authorized distributors?
All MMBZ5239BLT3G 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 MMBZ5239BLT3G meets industry standards.
7.What is the process for return or replacement of MMBZ5239BLT3G?
All MMBZ5239BLT3G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5239BLT3G, 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 MMBZ5239BLT3G part is unused and in its original packaging.
Return procedure for MMBZ5239BLT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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