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onsemi MMBZ5239ELT1G
- Part No.:
- MMBZ5239ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5239ELT1G.pdf
- Description:
- DIODE ZENER 9.1V 225MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:6,985
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Product details
Overview
MMBZ5239ELT1G from onsemi is a 9.1 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation at 25°C, with 10 Ω dynamic impedance at 20 mA test current and 3 μA leakage at 7 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.
For engineers reviewing the MMBZ5239ELT1G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance, thermal resistance (556 °C/W on FR-5), ESD robustness (>16 kV HBM), and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates in reverse breakdown to maintain stable voltage regulation across load and line variations. Its 9.1 V nominal Zener voltage exhibits a positive temperature coefficient near zero crossing - typical for mid-voltage Zeners - enabling predictable drift behavior from −65°C to +150°C junction temperature.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode) and supports automated placement. With 225 W peak pulse power handling (8 × 20 μs), it withstands transient surges while maintaining regulation integrity under pulsed stress conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.65–9.55 V @ IZT = 20 mA; ensures tight regulation window for 9 V rail stabilization |
| Power Dissipation (PD) | 225 mW @ TA = 25°C on FR-5 board; defines continuous DC power limit in standard PCB environments |
| Zener Impedance (ZZT) | 10 Ω @ IZT = 20 mA; indicates low AC impedance for effective ripple suppression in reference circuits |
| Leakage Current (IR) | 3 μA @ VR = 7 V; confirms minimal parasitic conduction below knee voltage |
| ESD Rating | Class 3 (>16 kV) per HBM; enables robust handling in manual assembly and end-user environments |
| Junction Temp Range | −65°C to +150°C; supports operation in automotive under-hood and industrial ambient extremes |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 mm × 1.30 mm × 1.00 mm body size, Pb-free, void-free thermoset plastic case with corrosion-resistant finish. Cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node in reverse-bias configuration; required for proper Zener orientation |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad should tie to this terminal |
| Pin 3 | Cathode | Connected to regulated output or higher-potential node; polarity band aligns with this pin |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables use in space-constrained battery-powered systems without forced cooling or derating penalties |
| ESD Robustness >16 kV (HBM) | Eliminates need for external ESD protection in handheld device front-end interfaces |
| Optimized SOT-23 Footprint | Supports 0.65 mm pitch pick-and-place and reflow soldering on fine-pitch PCBs |
| Low Dynamic Impedance (10 Ω) | Minimizes output voltage variation under changing load current in feedback reference paths |
| Pb-Free Construction | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-609 Category 1 moisture sensitivity |
Applications
| Battery Voltage Monitoring | USB Port Overvoltage Clamp |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charging/discharging in wearables. IC Role / Device Role / Timing Role: Zener reference input to comparator or ADC reference divider network. Use Value: Tight 9.1 V tolerance ensures accurate detection of 4.2 V full-charge threshold via resistive scaling. |
Use Scenario: Protecting USB data lines and VBUS from ESD and transient overvoltage events. IC Role / Device Role / Timing Role: Low-capacitance shunt clamp placed between signal line and ground. Use Value: 3 μA leakage at 7 V prevents false triggering while clamping 8/20 μs transients up to 225 W. |
| Low-Power Sensor Biasing | Industrial PLC Input Protection |
|
Use Scenario: Providing stable bias voltage to analog sensor ICs in IoT edge nodes. IC Role / Device Role / Timing Role: Precision voltage reference for op-amp biasing or sensor excitation. Use Value: 10 Ω ZZT maintains <±10 mV regulation error across 1–20 mA load current swings. |
Use Scenario: Safeguarding digital input channels against field-induced surges in factory automation. IC Role / Device Role / Timing Role: Primary overvoltage limiter before optocoupler or Schmitt trigger input stage. Use Value: −65°C to +150°C operating range ensures reliability in uncontrolled cabinet environments. |
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, but 300 mW rating and higher ZZT (15 Ω); SOT-23 package with identical pinout | Higher power margin suits higher-current reference designs; less suitable for ultra-low-leakage sensing | Select BZX84-C9V1 when >225 mW continuous dissipation is required and layout allows same footprint |
| MMBZ5239BS | Same electrical specs, but in SOD-123 package (larger, 2.7 × 1.7 mm); no Pin 2 NC terminal | Lower thermal resistance (RJA ≈ 400 °C/W) improves power handling; incompatible with SOT-23 land pattern | Choose MMBZ5239BS only if board redesign accommodates larger footprint and improved thermal performance is critical |
Compared with BZX84-C9V1 and MMBZ5239BS, the MMBZ5239ELT1G offers optimal balance of low-profile SOT-23 packaging, 225 mW rating, and 10 Ω impedance - making it preferred for space-limited, battery-operated systems where precise 9.1 V clamping is required without thermal overhead.
Availability
MMBZ5239ELT1G is available at Aetrix Electronics and suitable for battery management systems, USB interface protection, low-power sensor biasing, and industrial digital input conditioning requiring stable component supply and long-term lifecycle support.
Supply support for MMBZ5239ELT1G 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 MMBZ52xxELT1G series belongs to onsemi's precision Zener regulator family, engineered specifically for compact, high-reliability voltage reference and transient suppression in portable and space-constrained electronics.
FAQ
What is the exact Zener voltage tolerance for MMBZ5239ELT1G?
The MMBZ5239ELT1G has a guaranteed Zener voltage range of 8.65 V to 9.55 V at 20 mA test current (IZT), corresponding to a ±5% tolerance around the nominal 9.1 V value. This specification is validated per onsemi's August 2024 Rev. 9 datasheet and applies under TA = 25°C conditions with pulse testing to minimize self-heating effects.
Does MMBZ5239ELT1G have a functional Pin 2 connection?
No - Pin 2 of the MMBZ5239ELT1G 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 thermal pads to this terminal may cause assembly defects or unintended coupling.
Can MMBZ5239ELT1G be used in automotive applications?
Yes - the SZMMBZ5239ELT1G variant is AEC-Q101 qualified and PPAP capable for automotive use. While the standard MMBZ5239ELT1G shares identical electrical and thermal specs, it is not certified for automotive-grade qualification. For automotive designs, specify the SZ-prefix part to ensure compliance with stress testing and traceability requirements.
What is the maximum allowable junction temperature for MMBZ5239ELT1G?
The MMBZ5239ELT1G has a specified junction and storage temperature range of −65°C to +150°C. Operation beyond +150°C risks irreversible degradation of the Zener junction. At ambient temperatures above 25°C, power dissipation must be linearly derated at 1.8 mW/°C on FR-5 board to maintain safe junction temperature.
How does the ESD rating of MMBZ5239ELT1G impact system-level design?
The MMBZ5239ELT1G carries Class 3 HBM ESD rating (>16 kV), meaning it can survive direct human-body discharge events without damage. This reduces or eliminates the need for external TVS diodes in handheld product interfaces - simplifying BOM and saving board area, provided the device is placed at the entry point of the protected node.
MMBZ5239ELT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- MMBZ52xxELT1G
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 9.1 V
- Tolerance:
- ±4.95%
- 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 (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBZ5239ELT1G FAQ
1.How can I place an order for MMBZ5239ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5239ELT1G 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 MMBZ5239ELT1G reliable?
The price and inventory of MMBZ5239ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5239ELT1G is usually 5 days.
3.What payment methods are accepted for MMBZ5239ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5239ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5239ELT1G?
MMBZ5239ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5239ELT1G 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 MMBZ5239ELT1G?
For technical support, including MMBZ5239ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5239ELT1G requirements.
6.How does Aetrix verify that MMBZ5239ELT1G is sourced from the original manufacturer or authorized distributors?
All MMBZ5239ELT1G 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 MMBZ5239ELT1G meets industry standards.
7.What is the process for return or replacement of MMBZ5239ELT1G?
All MMBZ5239ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5239ELT1G, 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 MMBZ5239ELT1G part is unused and in its original packaging.
Return procedure for MMBZ5239ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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