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Diodes Incorporated MMBZ5239B-7-F
- Part No.:
- MMBZ5239B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5239B-7-F.pdf
- Description:
- DIODE ZENER 9.1V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,881
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Product details
Overview
MMBZ5239B-7-F from Diodes Incorporated is a 9.1 V, 350 mW surface-mount Zener diode in SOT23 package, rated for 20 mA test current with 10 Ω dynamic impedance at 1 kHz and 3.0 µA reverse leakage at 7.0 V. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits on FR-4 PCBs.
For engineers reviewing the MMBZ5239B-7-F datasheet, MMBZ5239B-7-F pinout, MMBZ5239B-7-F application, or MMBZ5239B-7-F equivalent, this part supports stable voltage clamping in power supply supervision, sensor biasing, and I/O line protection where tight tolerance (±5%), low thermal resistance (357 °C/W), and AEC-Q qualified variants are critical.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 9.1 V (range 8.65–9.56 V at 20 mA), exhibiting 10 Ω impedance at 1 kHz and 600 Ω at knee current (0.25 mA). Its planar die construction ensures stable voltage regulation under transient conditions.
Thermal performance is defined for FR-4 PCB mounting per JEDEC standards: 350 mW power dissipation at 25°C ambient, derating linearly above 25°C per Fig. 1, with junction-to-ambient thermal resistance of 357 °C/W and operating temperature range from –65°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V nominal (8.65–9.56 V range at IZT = 20 mA); enables precise 9 V rail clamping in 3.3/5 V systems. |
| Power Dissipation (PD) | 350 mW on FR-4 PCB; supports continuous regulation without heatsinking in space-constrained layouts. |
| Zener Impedance (ZZT) | 10 Ω at f = 1 kHz, IZT = 20 mA; ensures minimal output voltage variation under load transients. |
| Reverse Leakage (IR) | 3.0 µA max at VR = 7.0 V; guarantees low standby current in battery-powered voltage reference circuits. |
| Thermal Resistance (RθJA) | 357 °C/W; defines maximum junction temperature rise for reliability modeling in ambient up to +85°C. |
| Operating Temperature | –65°C to +150°C; validated for industrial and automotive under-hood environments per JEDEC high-reliability criteria. |
Pinout & Package
Package: SOT23 - 3-pin surface-mount plastic package with matte tin-plated Alloy 42 leadframe, UL 94V-0 rated molding compound, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node during Zener operation; required for correct polarity in reverse-bias clamping. |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher-potential node; carries regulated voltage output when reverse biased above VZ. |
| No Connect (Pin 3) | Internal die attach flag | Electrically isolated; serves mechanical support only-must not be connected in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ tolerance (±5%) and repeatable breakdown characteristics across production lots. |
| 350 mW dissipation on FR-4 | Eliminates need for thermal vias or copper pours in cost-sensitive consumer PCB designs. |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU with <900 ppm Br, <900 ppm Cl, <1000 ppm Sb-certified for green manufacturing. |
| SOT23 footprint compatibility | Standardized 2.9 mm × 1.3 mm outline allows drop-in replacement in existing automated assembly lines. |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
|
Use Scenario: Stabilizing bias voltage for analog front-end op-amps in temperature/humidity sensors. IC Role / Device Role / Timing Role: Zener reference source providing 9.1 V rail for precision ADC driver stages. Use Value: Maintains ±0.5% reference stability over –40°C to +85°C, reducing calibration drift in field-deployed instrumentation. |
Use Scenario: Clamping D+ and D− lines against ESD and hot-swap transients in USB 2.0 host ports. IC Role / Device Role / Timing Role: Low-capacitance shunt protector limiting voltage to 9.1 V before TVS diode activation. Use Value: Absorbs 350 mW surge energy without latch-up, preserving signal integrity during 8 kV contact discharge events. |
| Automotive Body Control Module (BCM) Power Supervision | IoT Node Battery Voltage Monitoring |
|
Use Scenario: Monitoring 12 V battery rail for undervoltage lockout in BCM microcontroller power domains. IC Role / Device Role / Timing Role: Precision Zener element in resistive divider feeding comparator input. Use Value: Delivers 9.1 V threshold with ±5% tolerance across –40°C to +125°C, meeting AEC-Q200 stress requirements. |
Use Scenario: Scaling Li-ion battery voltage (3.0–4.2 V) to 0–3.3 V ADC input using resistor divider with reference clamp. IC Role / Device Role / Timing Role: Low-leakage (3.0 µA @ 7 V) voltage limiter preventing ADC saturation during full-charge states. Use Value: Extends coin-cell lifetime by minimizing quiescent current draw in always-on monitoring circuits. |
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, but 250 mW rating and 15 Ω ZZT; SOT23 package with different marking code. | Limited to lower-power regulation; unsuitable for sustained 20 mA loads requiring 350 mW margin. | Select when thermal budget is constrained and peak current remains below 12 mA. |
| MMBZ5239BS-7-F | Identical electrical specs but SOD-323 package (1.7 × 1.3 mm); 250 mW rating due to smaller thermal mass. | Preferred for ultra-dense layouts where board area is prioritized over power handling. | Choose only if PCB real estate is critical and average power dissipation stays ≤200 mW. |
Compared with BZX84-C9V1 and MMBZ5239BS-7-F, MMBZ5239B-7-F delivers superior thermal robustness (350 mW vs. 250 mW) and lower dynamic impedance (10 Ω vs. 15 Ω), making it optimal for industrial-grade voltage references demanding long-term stability under variable load.
Availability
MMBZ5239B-7-F is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, automotive power supervision, and IoT battery monitoring requiring stable component supply across extended temperature ranges and high-volume production cycles.
Supply support for MMBZ5239B-7-F 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and integrated circuits, specializing in high-reliability components for industrial, automotive, and computing markets.
This device belongs to the MMBZ52xxB series of 350 mW Zener diodes designed specifically for precision voltage regulation and transient suppression in compact, automated-assembly PCBs.
FAQ
What is the maximum continuous Zener current for MMBZ5239B-7-F at 25°C ambient?
The device supports 20 mA test current (IZT) and can sustain up to 38.9 mA continuously at 25°C ambient, calculated from PD = 350 mW and VZ = 9.1 V. Derating applies above 25°C per the linear curve in Figure 1 of DS18011 Rev. 26-2.
Is MMBZ5239B-7-F qualified for automotive applications?
MMBZ5239B-7-F itself is not AEC-Q200 qualified, but Diodes offers automotive-grade equivalents (e.g., MMBZ5239BQ-7-F) manufactured in IATF 16949 certified facilities and PPAP capable. These variants carry Q-suffix markings and meet AEC-Q200 stress testing requirements.
How does the SOT23 package affect thermal performance compared to DO-35?
The SOT23 package achieves 357 °C/W junction-to-ambient resistance on FR-4, significantly higher than DO-35's ~200 °C/W. This requires careful PCB layout-recommended pad dimensions (2.0 mm × 0.9 mm) and thermal relief design-to maintain safe junction temperatures under full 350 mW load.
Can MMBZ5239B-7-F be used in series for higher voltage regulation?
Yes-multiple units may be cascaded in series to achieve higher regulated voltages (e.g., two in series yield ~18.2 V), but mismatch in Zener impedance and temperature coefficients will increase total tolerance. For >12 V applications, discrete high-voltage Zeners or dedicated IC regulators are preferred for accuracy.
MMBZ5239B-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- 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:
- ±5%
- Power - Max:
- 350 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
MMBZ5239B-7-F FAQ
1.How can I place an order for MMBZ5239B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5239B-7-F 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 MMBZ5239B-7-F reliable?
The price and inventory of MMBZ5239B-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5239B-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5239B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5239B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5239B-7-F?
MMBZ5239B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5239B-7-F 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 MMBZ5239B-7-F?
For technical support, including MMBZ5239B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5239B-7-F requirements.
6.How does Aetrix verify that MMBZ5239B-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5239B-7-F 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 MMBZ5239B-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5239B-7-F?
All MMBZ5239B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5239B-7-F, 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 MMBZ5239B-7-F part is unused and in its original packaging.
Return procedure for MMBZ5239B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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