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Diodes Incorporated MMBZ5259B-7-F
- Part No.:
- MMBZ5259B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5259B-7-F.pdf
- Description:
- DIODE ZENER 39V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,900
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Product details
Overview
MMBZ5259B-7-F from Diodes Incorporated is a 39V ±2.5% tolerance, 350mW surface-mount Zener diode in SOT23 package, designed for precision voltage regulation and overvoltage protection in low-power analog circuits. It delivers 80Ω zener impedance at 3.2mA test current, 0.1µA reverse leakage at 30V, and operates across –65°C to +150°C ambient range.
For engineers reviewing the MMBZ5259B-7-F datasheet, MMBZ5259B-7-F pinout, MMBZ5259B-7-F application, or MMBZ5259B-7-F equivalent, key selection criteria include its tight 39V nominal breakdown voltage, low thermal resistance (357°C/W on FR4), RoHS-compliant green molding compound, and suitability for automated SMT assembly in space-constrained consumer and industrial power management designs.
Technical Context
This Zener diode operates in reverse-biased avalanche mode with a specified 39V nominal breakdown voltage at IZT = 3.2mA. Its 80Ω dynamic impedance at 1kHz ensures stable regulation under small-signal load variations, while the 0.1µA reverse leakage at VR = 30V confirms low standby power loss in protection circuits.
The device uses planar die construction and matte tin-plated Alloy 42 leadframe for solderability per MIL-STD-202. Thermal derating begins above +25°C ambient, following a linear curve to zero dissipation at +150°C, with moisture sensitivity rated Level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39V nominal, 37.05–40.95V range at 3.2mA - enables precise 39V reference or clamp in analog sensing and supply monitoring. |
| Power Dissipation (PD) | 350mW on FR4 PCB - supports continuous regulation in low-power signal conditioning without heatsinking. |
| Zener Impedance (ZZT) | 80Ω at 1kHz, 3.2mA - minimizes output voltage variation under dynamic load transients in feedback paths. |
| Reverse Leakage (IR) | 0.1µA at 30V - ensures negligible quiescent current draw in battery-backed or energy-harvesting circuits. |
| Thermal Resistance (RθJA) | 357°C/W - defines junction-to-ambient temperature rise per watt; requires minimal copper area for thermal management. |
| Operating Temperature | –65°C to +150°C - qualified for under-hood automotive modules and industrial control enclosures without derating. |
Pinout & Package
Package: SOT23 - 3-pin surface-mount plastic package with 0.915mm pin pitch, 2.40mm body length, and 1.30mm body width; UL 94V-0 rated green molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground path | Connected to system ground or lower-potential node when used as shunt regulator or clamp. |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Provides stable 39V reference relative to anode; connects to input rail or protected circuit node. |
| No Connect (Pin 3) | Non-functional mechanical support pin | Internally unconnected; must remain floating-no routing or soldering required. |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables consistent breakdown voltage distribution and high reliability across production lots. |
| 350mW dissipation on standard FR4 | Eliminates need for thermal vias or oversized pads in cost-sensitive consumer PCB layouts. |
| Lead-free, halogen-free, antimony-free "Green" compound | Meets global environmental compliance (RoHS 3, JEDEC High Reliability) without performance trade-offs. |
| SOT23 footprint compatibility | Supports drop-in replacement of legacy 39V Zeners (e.g., BZX84-C39, MM3Z39V) in existing SMT lines. |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Clamp |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 16-bit ADC front-end in temperature transmitters. IC Role / Device Role / Timing Role: Shunt regulator providing 39V rail for op-amp bias and ADC reference buffer. Use Value: 80Ω zener impedance maintains <±0.5 LSB error under 100µA load shifts, ensuring measurement repeatability. |
Use Scenario: Overvoltage clamp on USB-C CC line during hot-plug events. IC Role / Device Role / Timing Role: Transient voltage suppressor limiting CC line to ≤39V during 20V PD negotiation faults. Use Value: 0.1µA leakage at 30V prevents false detection during 5V default mode, preserving enumeration integrity. |
| Automotive Cabin Control Panel | IoT Node Battery Monitor |
|
Use Scenario: Regulating 39V auxiliary supply for touch controller ASIC in dashboard display. IC Role / Device Role / Timing Role: Primary voltage clamp protecting ASIC inputs from load-dump-induced spikes up to 40V. Use Value: –65°C to +150°C rating allows direct placement near heat-generating display drivers without derating. |
Use Scenario: Reference element in Li-ion cell voltage monitor circuit for smart thermostats. IC Role / Device Role / Timing Role: Precision 39V Zener establishing threshold for low-battery warning comparator. Use Value: ±2.5% tolerance ensures accurate 3.9V per-cell alert at 10-cell stack, minimizing premature shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C39 | Same 39V nominal, but 300mW PD, 100Ω ZZT, wider ±5% tolerance | Limited to lower-power clamping where 350mW headroom and tighter regulation not required | Select when cost sensitivity outweighs thermal margin and regulation stability needs |
| MM3Z39V | Same 39V nominal, 300mW PD, 120Ω ZZT, 0.5µA IR at 30V | Higher leakage reduces accuracy in ultra-low-power wake-up circuits | Prefer only for non-critical voltage references where leakage >0.1µA is acceptable |
Compared with BZX84-C39 and MM3Z39V, MMBZ5259B-7-F provides superior thermal margin (+50mW), lower dynamic impedance (–20–40Ω), and fivefold lower leakage-making it optimal for precision regulation in thermally constrained or battery-sensitive designs.
Availability
MMBZ5259B-7-F is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery protection, and automotive cabin control panels requiring stable component supply with full traceability and lifecycle continuity.
Supply support for MMBZ5259B-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design centers across Asia, Europe, and the US.
This part belongs to the MMBZ52xxB series of 350mW Zener diodes engineered for high-reliability voltage reference and transient suppression in space-constrained, high-volume SMT applications.
FAQ
What is the maximum continuous Zener current for MMBZ5259B-7-F at 25°C ambient?
The device supports up to 8.97mA continuous Zener current at 25°C, calculated from PD = 350mW and VZ = 39V (IZMAX = PD/VZ). Derating applies above 25°C per Figure 1, reaching zero current at 150°C ambient.
Can MMBZ5259B-7-F be used in place of older MMBZ5259B variants without layout changes?
Yes-MMBZ5259B-7-F uses the same SOT23 footprint, pinout, and thermal profile as prior revisions. The "-7-F" suffix denotes tape-and-reel packaging (3,000 units/reel) and lead-free finish; no PCB redesign is needed for drop-in replacement.
Does this Zener diode meet AEC-Q200 stress testing requirements?
No-MMBZ5259B-7-F is a commercial-grade part. For automotive applications, Diodes offers the Q-suffix variant (e.g., MMBZ5259BQ-7-F), which is AEC-Q200 qualified, PPAP-capable, and manufactured in IATF 16949 certified facilities.
How does the 80Ω zener impedance affect regulation accuracy under varying load conditions?
At 1kHz, 80Ω impedance means a 1mA load change induces only 80mV output shift (ΔV = ZZ × ΔI). This enables stable 39V reference in feedback loops where load currents vary between 2–4mA, such as in op-amp bias networks or comparator hysteresis circuits.
MMBZ5259B-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):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 30 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
MMBZ5259B-7-F FAQ
1.How can I place an order for MMBZ5259B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5259B-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 MMBZ5259B-7-F reliable?
The price and inventory of MMBZ5259B-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 MMBZ5259B-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5259B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5259B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5259B-7-F?
MMBZ5259B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5259B-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 MMBZ5259B-7-F?
For technical support, including MMBZ5259B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5259B-7-F requirements.
6.How does Aetrix verify that MMBZ5259B-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5259B-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 MMBZ5259B-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5259B-7-F?
All MMBZ5259B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5259B-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 MMBZ5259B-7-F part is unused and in its original packaging.
Return procedure for MMBZ5259B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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