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onsemi MMBZ5239BLT3
- Part No.:
- MMBZ5239BLT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5239BLT3.pdf
- Description:
- DIODE ZENER 9.1V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,182
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Product details
Overview
MMBZ5239BLT3 from onsemi is a 9.1 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 10 Ω dynamic impedance at 20 mA test current and 3 μA leakage current at 7 V reverse bias - used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the MMBZ5239BLT3 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (556 °C/W), ESD rating (>16 kV HBM), cathode-anode polarity marking, and compatibility with high-density SMT assembly on handheld and battery-powered PCBs.
Technical Context
This device operates as a two-terminal voltage reference diode with fixed breakdown behavior under reverse bias. Its nominal Zener voltage of 9.1 V is specified at 20 mA test current (IZT), with temperature coefficient near zero in the 8–10 V range per typical characteristics (Figure 1).
The SOT-23 package features Pin 1 = Anode, Pin 2 = No Connection, Pin 3 = Cathode, and supports automated placement with Pb-free, RoHS-compliant construction. Thermal performance is defined for FR-5 board (225 mW @ 25°C) and alumina substrate (300 mW @ 25°C), with derating slopes of 1.8 mW/°C and 2.4 mW/°C respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.64 V min / 9.1 V nom / 9.56 V max @ IZT = 20 mA - defines stable regulation point for low-power biasing and clamping. |
| Power Dissipation (PD) | 225 mW on FR-5 board @ 25°C - sets maximum continuous DC power handling without heatsinking. |
| Zener Impedance (ZZT) | 10 Ω max @ IZT = 20 mA - indicates low AC impedance for stable voltage under varying load current. |
| Leakage Current (IR) | 3 μA max @ VR = 7 V - ensures minimal standby current in undervoltage detection circuits. |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - enables robust handling in consumer electronics assembly lines. |
| Junction Temperature Range | −65°C to +150°C - supports operation in automotive cabin and industrial ambient environments. |
Pinout & Package
SOT-23 (TO-236) package: 2.90 mm × 1.30 mm × 1.00 mm body, 1.90 mm pitch, void-free thermosetting plastic case with corrosion-resistant finish; cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; must be held at least 0.95 V below cathode for forward conduction. |
| 2 | No Connection | Internally unconnected; no PCB trace or pad required - simplifies layout and avoids floating node risks. |
| 3 | Cathode | Connected to regulated output or clamp node; polarity band on package aligns with this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW surface-mount rating | Enables compact voltage regulation on space-constrained FR-5 PCBs without external heatsinking. |
| ESD immunity >16 kV HBM | Eliminates need for additional ESD protection in handheld device front-end circuits. |
| Pb-free, halogen-free, RoHS-compliant | Meets global environmental compliance requirements for consumer and industrial end products. |
| Optimized for automated assembly | Standard SOT-23 footprint and marking support high-yield pick-and-place and reflow processes. |
Applications
| USB Power Input Protection | Li-ion Battery Charger Reference |
|---|---|
Use Scenario: Clamping transient surges on 5 V USB input rails during hot-plug events. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing fast overvoltage clamping path to ground. Use Value: Limits peak voltage to ≤9.56 V, protecting downstream LDOs and USB interface ICs from damage. |
Use Scenario: Generating precise 9.1 V reference for charger IC feedback loop in portable medical devices. IC Role / Device Role / Timing Role: Stable DC voltage reference source with <±5% tolerance and low tempco. Use Value: Enables ±1% charge voltage accuracy across −20°C to +70°C operating range. |
| IoT Sensor Node Voltage Monitor | Industrial PLC Digital Input Conditioning |
Use Scenario: Detecting brown-out conditions on 3.3 V microcontroller supply using resistor-divider + Zener threshold. IC Role / Device Role / Timing Role: Reverse-biased threshold detector with 3 μA leakage ensuring low quiescent current. Use Value: Delivers reliable reset signaling with <1 μA total monitoring circuit current at 3.3 V nominal rail. |
Use Scenario: Level-shifting and overvoltage protection for 24 V digital inputs in factory automation controllers. IC Role / Device Role / Timing Role: Clamp diode limiting input transients to safe levels before optocoupler input stage. Use Value: Withstands repetitive 1 kV/μs transients while maintaining <10 Ω dynamic impedance for fast response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C9V1 | Same 9.1 V nominal Zener, but 300 mW rating and higher ZZT (15 Ω max); SOT-23 package with identical pinout. | Higher power handling suits higher-current clamping; less suitable for ultra-low-leakage monitoring due to 10 μA IR @ 7 V. | Select when >225 mW dissipation margin is required and leakage sensitivity is secondary. |
| MMBZ5239BS | Same electrical specs, but in SOD-123 package (larger footprint, 500 mW rating); not SMT-optimized for high-density layouts. | Used where manual rework or thermal relief is prioritized over board area; incompatible with fine-pitch SOT-23 pick-and-place feeders. | Choose only if thermal budget exceeds 225 mW and board real estate allows larger 2.8 mm × 1.6 mm footprint. |
Compared with BZX84-C9V1 and MMBZ5239BS, the MMBZ5239BLT3 delivers optimal balance of low-profile SOT-23 packaging, 225 mW FR-5 board rating, 10 Ω Zener impedance, and 3 μA leakage - making it preferred for space- and power-constrained portable designs requiring repeatable 9.1 V regulation.
Availability
MMBZ5239BLT3 is available at Aetrix Electronics and suitable for USB power protection, Li-ion charger reference, IoT sensor monitoring, and industrial digital input conditioning requiring stable component supply and full traceability.
Supply support for MMBZ5239BLT3 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 electronics, with leadership in power management, analog, sensors, and connectivity solutions.
The MMBZ52xxBLT3G series is designed for compact, high-reliability voltage regulation in portable and battery-powered systems - emphasizing low leakage, high ESD immunity, and automated assembly compatibility.
FAQ
What is the Zener voltage tolerance of MMBZ5239BLT3?
The MMBZ5239BLT3 has a Zener voltage tolerance of ±5% around its nominal 9.1 V value, meaning the actual measured VZ falls between 8.64 V and 9.56 V when tested at IZT = 20 mA and TA = 25°C. This tolerance is guaranteed across the full operating temperature range and reflects manufacturing process control for consistent regulation performance in production designs.
Does MMBZ5239BLT3 have a built-in capacitor or integrated ESD structure?
No, the MMBZ5239BLT3 is a discrete silicon Zener diode with no integrated capacitor or active ESD protection circuitry. Its ESD rating (>16 kV HBM) results from optimized junction design and packaging - not added components. Capacitance is 15 pF typical at 50% VZ bias (per Figure 5), and designers must add external filtering or TVS devices for system-level surge immunity beyond HBM-level events.
Can MMBZ5239BLT3 replace MMBZ5239BLT1G in existing designs?
Yes, MMBZ5239BLT3 is functionally and electrically identical to MMBZ5239BLT1G - both share the same Zener voltage, impedance, leakage, and thermal specs. The "T3" suffix denotes 10,000-unit tape-and-reel packaging versus "T1G" (3,000 units), with identical SOT-23 mechanical form factor, pinout, and Pb-free construction. No layout or schematic changes are needed for substitution.
What is the maximum continuous reverse current MMBZ5239BLT3 can handle without degradation?
The MMBZ5239BLT3 is rated for continuous reverse current up to 20 mA (IZT) at 25°C ambient on FR-5 board, corresponding to its 225 mW power limit. At higher temperatures, derating applies: maximum IZ decreases linearly at 1.8 mW/°C above 25°C. Sustained operation above 20 mA at elevated ambient temperatures risks exceeding junction temperature limits and long-term parameter drift.
Is MMBZ5239BLT3 qualified for automotive applications?
No - the standard MMBZ5239BLT3 is not AEC-Q101 qualified. For automotive use, the SZMMBZ5239BLT3G variant must be selected: it carries the "SZ" prefix, undergoes additional screening, and is PPAP-capable. The base MMBZ5239BLT3 meets industrial reliability standards but lacks the extended temperature validation, lot traceability, and failure rate reporting required for automotive ECUs and ADAS modules.
MMBZ5239BLT3 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)
MMBZ5239BLT3 FAQ
1.How can I place an order for MMBZ5239BLT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5239BLT3 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 MMBZ5239BLT3 reliable?
The price and inventory of MMBZ5239BLT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5239BLT3 is usually 5 days.
3.What payment methods are accepted for MMBZ5239BLT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5239BLT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5239BLT3?
MMBZ5239BLT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5239BLT3 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 MMBZ5239BLT3?
For technical support, including MMBZ5239BLT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5239BLT3 requirements.
6.How does Aetrix verify that MMBZ5239BLT3 is sourced from the original manufacturer or authorized distributors?
All MMBZ5239BLT3 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 MMBZ5239BLT3 meets industry standards.
7.What is the process for return or replacement of MMBZ5239BLT3?
All MMBZ5239BLT3 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5239BLT3, 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 MMBZ5239BLT3 part is unused and in its original packaging.
Return procedure for MMBZ5239BLT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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