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Diodes Incorporated MMBZ5239B-7
- Part No.:
- MMBZ5239B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5239B-7.pdf
- Description:
- DIODE ZENER 9.1V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,316
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Product details
Overview
MMBZ5239B-7 from Diodes Incorporated is a 9.1V, 350mW surface-mount Zener diode in SOT23 package, designed for precision voltage regulation and transient overvoltage clamping in low-power analog and digital circuits. It delivers ±5% zener voltage tolerance (8.65–9.56V), 10Ω dynamic impedance at 20mA test current, and maintains ≤3µA reverse leakage at 7.0V, enabling stable reference generation in battery-powered sensors and I/O protection networks.
For engineers reviewing the MMBZ5239B-7 datasheet, MMBZ5239B-7 pinout, MMBZ5239B-7 application, or MMBZ5239B-7 equivalent, this part supports critical design tasks including low-voltage rail stabilization, ESD-sensitive interface clamping, and compact voltage reference design where thermal derating on FR-4 PCBs and RoHS-compliant lead-free assembly are required.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal zener voltage of 9.1V at 20mA test current (IZT), exhibiting 10Ω zener impedance (ZZT) and 600Ω knee impedance (ZZK) at 0.25mA. Its thermal resistance is 357°C/W when mounted on FR-4 PCB with recommended pad layout.
The device is rated for continuous power dissipation of 350mW at 25°C ambient, derating linearly above 25°C per Figure 1, and supports operation across -65°C to +150°C junction temperature range. It features planar die construction and matte tin-plated alloy 42 leadframe for reliable solderability and high-reliability performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1V nominal (8.65–9.56V range); enables precise 9V rail clamping or reference without external trimming. |
| Power Dissipation (PD) | 350mW on FR-4 PCB; supports sustained regulation in space-constrained, low-power signal chains. |
| Zener Impedance (ZZT) | 10Ω @ IZT = 20mA; ensures minimal output voltage variation under load changes in feedback paths. |
| Reverse Leakage (IR) | ≤3.0µA @ VR = 7.0V; guarantees negligible quiescent current draw in always-on monitoring circuits. |
| Thermal Resistance (RθJA) | 357°C/W; defines maximum junction temperature rise per milliwatt-critical for thermal margin calculation on standard PCBs. |
| Package | SOT23; 3-pin surface-mount footprint compatible with automated pick-and-place and reflow processes. |
| RoHS Compliance | Fully lead-free, halogen- and antimony-free "Green" compound; meets EU Directive 2015/863/EU. |
Pinout & Package
Package: SOT23 - 3-pin, small-outline transistor package with 2.9mm × 1.3mm body, 0.95mm height, and gull-wing leads. Molded green compound rated UL 94V-0; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground path | Connected to system ground or lower-potential node during Zener operation; defines polarity for reverse-bias configuration. |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to voltage rail requiring stabilization; carries full Zener current during regulation or clamping events. |
| No-connect (Pin 3) | Unused internal die connection | Electrically isolated; must remain unconnected per datasheet-no tie-to-ground or routing allowed. |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ tolerance control and repeatable breakdown characteristics across production lots. |
| 350mW dissipation on FR-4 | Validated thermal performance without heatsinking-supports direct integration into dense PCB layouts. |
| Matte tin finish on Alloy 42 leadframe | Ensures MIL-STD-202-compliant solderability and intermetallic stability during multiple reflow cycles. |
| JEDEC High Reliability qualification | Meets AEC-Q stress test requirements-suitable for industrial and extended-temperature applications. |
Applications
| Industrial Sensor Signal Conditioning | USB Port ESD Clamping |
|---|---|
|
Use Scenario: Stabilizing 9V reference for 12-bit ADC front-end in temperature transmitters operating at 85°C ambient. IC Role / Device Role / Timing Role: Zener diode provides low-drift voltage reference for op-amp biasing and ADC reference divider network. Use Value: 10Ω ZZT minimizes code spread under varying sensor load; 350mW rating sustains regulation without thermal shutdown. |
Use Scenario: Bidirectional clamping on USB D+ and D− lines to suppress ±15kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Discrete Zener acts as low-capacitance (<2pF) shunt clamp, diverting surge current away from PHY IC pins. Use Value: 9.1V breakdown voltage aligns with USB 2.0 data line swing limits; SOT23 footprint allows placement within 3mm of connector. |
| Low-Power IoT Node Voltage Reference | Automotive Body Control Module I/O Protection |
|
Use Scenario: Generating stable 9V bias for RF transceiver LDO enable circuitry in coin-cell-powered BLE beacons. IC Role / Device Role / Timing Role: Zener regulates gate voltage of external PMOS pass transistor used in ultra-low-quiescent LDO stage. Use Value: ≤3µA IR at 7V ensures <10nA total leakage contribution-preserving multi-year battery life. |
Use Scenario: Protecting LIN bus transceiver inputs against load-dump transients up to 40V in door module ECUs. IC Role / Device Role / Timing Role: Zener diode clamps input pins to safe voltage during 12V system overvoltage events. Use Value: 350mW rating handles short-duration pulses; JEDEC qualification ensures reliability under automotive thermal cycling. |
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 (Nexperia) | Same 9.1V nominal, 300mW rating, SOT23 package; higher ZZT (15Ω) and wider VZ tolerance (±6%). | Limited to non-critical references where 500mV regulation window is acceptable. | Select when cost sensitivity outweighs impedance and tolerance requirements. |
| MMBZ5239BS-7-F (Diodes Inc.) | Same electrical specs but with enhanced moisture sensitivity level (MSL 1 vs. MSL 1 in base part); identical marking and packaging. | No functional difference-intended for high-humidity assembly environments requiring stricter floor-life control. | Choose only if J-STD-020 MSL compliance documentation is contractually mandated. |
Compared with BZX84-C9V1 and MMBZ5239BS-7-F, the MMBZ5239B-7 offers tighter voltage tolerance and lower impedance for precision regulation, while maintaining identical form factor and JEDEC reliability-making it optimal for designs where reference accuracy and thermal stability are prioritized over marginal cost savings or humidity-specific handling.
Availability
MMBZ5239B-7 is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB interface protection, and low-power IoT voltage reference applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for MMBZ5239B-7 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 analog ICs, specializing in high-reliability components for industrial, automotive, and consumer markets with ISO/TS 16949 and IATF 16949 certified facilities.
The MMBZ52xxB series belongs to Diodes' precision Zener diode product line, engineered for stable voltage reference and overvoltage protection in compact, automated-assembly-ready packages targeting space-constrained and thermally demanding applications.
FAQ
What is the maximum continuous Zener current for MMBZ5239B-7 at 75°C ambient?
At 75°C ambient, the power derating curve (Figure 1) reduces allowable dissipation to approximately 250mW. With VZ = 9.1V, the maximum continuous Zener current is ~27.5mA-calculated as PD_max / VZ. Exceeding this risks thermal runaway due to increased junction temperature.
Can MMBZ5239B-7 be used in series for higher voltage regulation?
No-MMBZ5239B-7 is not characterized or guaranteed for series operation. Zener voltage tolerances and impedance mismatches between devices cause uneven voltage sharing, risking premature failure of one diode. Use a single higher-voltage Zener or dedicated programmable reference IC instead.
Is the SOT23 pinout standardized across all manufacturers for this part?
Yes-the SOT23 package for Zener diodes follows JEDEC MO-215 standard: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = NC. Diodes Incorporated confirms this configuration in DS18011 Rev. 26, and it matches industry-standard SOT23 Zener pinouts from ON Semiconductor, Nexperia, and Vishay.
Does MMBZ5239B-7 meet AEC-Q200 requirements for passive components?
No-MMBZ5239B-7 is qualified to JEDEC high-reliability standards referenced in AEC-Q, but it is not AEC-Q200 certified. For automotive-grade passive compliance, select the Q-suffix variant (e.g., MMBZ5239BQ-7-F), which undergoes full AEC-Q200 stress testing and is manufactured in IATF 16949-certified facilities.
MMBZ5239B-7 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:
- Discontinued at Digi-Key
- 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 FAQ
1.How can I place an order for MMBZ5239B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5239B-7 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 reliable?
The price and inventory of MMBZ5239B-7 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 is usually 5 days.
3.What payment methods are accepted for MMBZ5239B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5239B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5239B-7?
MMBZ5239B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5239B-7 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?
For technical support, including MMBZ5239B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5239B-7 requirements.
6.How does Aetrix verify that MMBZ5239B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5239B-7 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 meets industry standards.
7.What is the process for return or replacement of MMBZ5239B-7?
All MMBZ5239B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5239B-7, 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 part is unused and in its original packaging.
Return procedure for MMBZ5239B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5239B-7 Tags
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