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Diodes Incorporated MMBZ5259BW-7-F
- Part No.:
- MMBZ5259BW-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
MMBZ5259BW-7-F.pdf
- Description:
- DIODE ZENER 39V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
MMBZ5259BW-7-F from Diodes Incorporated is a 39 V, 200 mW surface-mount Zener diode in SOT323 package, rated for ±2.5% voltage tolerance at 3.2 mA test current, with 80 Ω dynamic impedance and 0.1 μA reverse leakage at 30 V, used for precision voltage regulation and overvoltage protection in low-power analog sensor interfaces.
For engineers reviewing the MMBZ5259BW-7-F datasheet, MMBZ5259BW-7-F pinout, MMBZ5259BW-7-F application, or MMBZ5259BW-7-F equivalent, key selection criteria include nominal Zener voltage (39 V), power rating (200 mW), thermal resistance (625 °C/W), Zener impedance (80 Ω @ 3.2 mA), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and temperature conditions. Its 39 V nominal Zener voltage is specified at 3.2 mA test current, with 37.05–40.95 V min/max range and 80 Ω impedance measured at 1 kHz.
Designed for surface-mount assembly on FR4 PCBs using recommended pad layout AP02001, it features matte tin-plated Alloy 42 leads, moisture sensitivity level 1, and operates across –65 °C to +150 °C ambient temperature range with derated power above +25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 39 V nominal, 37.05–40.95 V range at 3.2 mA - defines regulated output voltage tolerance in reference circuits |
| Power Dissipation | 200 mW at 25 °C - limits continuous power handling without heatsinking on standard FR4 board |
| Zener Impedance | 80 Ω at 1 kHz, 3.2 mA - determines voltage regulation stability under dynamic load changes |
| Reverse Leakage | 0.1 μA at 30 V - ensures minimal quiescent current in standby or high-impedance bias networks |
| Thermal Resistance | 625 °C/W junction-to-ambient - sets temperature rise per watt dissipated on standard PCB layout |
| Operating Temp | –65 °C to +150 °C - supports automotive under-hood and industrial control environments |
| AEC-Q101 Qualified | Yes - validated for automotive electronics applications requiring high-reliability stress testing |
Pinout & Package
Package: SOT323 - ultra-small plastic surface-mount case (2.10 mm × 1.30 mm × 0.90 mm), lead-free, halogen-free, RoHS-compliant, weight ≈ 0.006 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; required for proper polarity orientation during placement |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher-potential node; carries regulated voltage output when reverse biased above 39 V |
| Collector / Case (Pin 3) | Thermal and electrical common | Internally tied to cathode in this Zener structure; serves as primary heat path and circuit reference point |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics use, including temperature cycling, HAST, and mechanical shock testing |
| SOT323 footprint | Enables high-density PCB layouts and compatibility with automated pick-and-place equipment |
| Green molding compound | UL 94V-0 rated, halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb) for environmental compliance |
| Matte tin plating | Solderable per MIL-STD-202 Method 208; eliminates lead contamination risk in assembly processes |
Applications
| Automotive Cabin Sensors | Industrial Analog Input Modules |
|---|---|
Use Scenario: Voltage reference for 39 V rail in cabin temperature/humidity sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Zener diode provides stable bias voltage for op-amp input stages and ADC reference dividers. Use Value: Tight 37.05–40.95 V tolerance and 0.1 μA leakage ensure measurement accuracy and low power consumption over –40 °C to +85 °C. | Use Scenario: Overvoltage clamp protecting 3.3 V/5 V microcontroller I/O pins from transient surges on 24 V fieldbus lines. IC Role / Device Role / Timing Role: Reverse-biased Zener shunts excess energy above 39 V to ground before reaching downstream logic. Use Value: 200 mW rating and 625 °C/W thermal resistance allow reliable clamping without thermal runaway during short-duration transients. |
| Medical Portable Monitors | Smart Meter Power Supplies |
Use Scenario: Precision voltage reference for battery-powered ECG front-end amplifiers requiring low-drift biasing. IC Role / Device Role / Timing Role: Zener establishes fixed reference point for instrumentation amplifier gain-setting resistors. Use Value: 80 Ω impedance minimizes output voltage variation under changing load currents, improving signal fidelity. | Use Scenario: Secondary-side voltage regulation in isolated flyback auxiliary supplies powering meter MCU and RTC. IC Role / Device Role / Timing Role: Provides stable 39 V rail for optocoupler feedback bias and LDO pre-regulation. Use Value: AEC-Q101 qualification and –65 °C to +150 °C operation support long-term reliability in outdoor meter enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C39LT1G | Same 39 V nominal, SOT23 package, 300 mW rating, 90 Ω Zz - higher power but larger footprint | Requires PCB redesign due to SOT23 pad layout; better for higher surge energy absorption | Select when >200 mW dissipation margin or legacy SOT23 tooling is required |
| MMSZ5259ET1G | Same 39 V, SOD-123 package, 500 mW rating, 70 Ω Zz - higher power, lower impedance, different thermal profile | Not AEC-Q101 qualified; suited for commercial-grade power rails, not automotive | Choose for cost-sensitive industrial supplies where AEC-Q101 is not mandated |
Compared with BZX84-C39LT1G and MMSZ5259ET1G, MMBZ5259BW-7-F uniquely balances AEC-Q101 compliance, SOT323 miniaturization, and 200 mW capability-making it optimal for space-constrained automotive sensors where reliability and footprint are co-prioritized.
Availability
MMBZ5259BW-7-F is available at Aetrix Electronics and suitable for automotive cabin sensors, industrial analog input modules, medical portable monitors, and smart meter power supplies requiring stable component supply with full traceability and lifecycle management.
Supply support for MMBZ5259BW-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 ICs, specializing in high-performance, high-reliability components for automotive, industrial, and consumer markets.
The MMBZ52xxBW series targets compact, high-reliability Zener regulation in automotive and industrial edge nodes, emphasizing AEC-Q101 qualification, green packaging, and SMT process compatibility.
FAQ
What is the maximum reverse voltage that MMBZ5259BW-7-F can safely block in non-breakdown mode?
The device blocks up to 30 V in reverse bias without significant leakage, as specified by IR = 0.1 μA at VR = 30 V. Beyond 30 V, Zener conduction begins gradually; full regulation occurs near its 39 V nominal breakdown point. Operation between 30 V and 39 V results in increasing leakage but remains within safe operating limits until rated test current is reached.
Can MMBZ5259BW-7-F be used in parallel for higher power dissipation?
No-Zener diodes exhibit negative temperature coefficient and parameter spread, causing current imbalance and thermal runaway when paralleled. For higher power, select a single higher-rated part like MMSZ5259ET1G (500 mW) or implement active regulation. Parallel use is not recommended even with external balancing resistors due to mismatched Zz and Vz tolerances.
Is the SOT323 package of MMBZ5259BW-7-F compatible with reflow soldering per J-STD-020?
Yes-the device is rated for moisture sensitivity level 1 and qualified for standard Pb-free reflow profiles (peak 260 °C). Its matte tin finish ensures reliable wetting, and the green molding compound withstands repeated thermal cycles. Follow Diodes' AP02001 pad layout and use recommended stencil aperture to prevent tombstoning.
Does MMBZ5259BW-7-F have a specified capacitance value for high-frequency filtering applications?
No specific capacitance is listed in the datasheet for MMBZ5259BW-7-F. Figure 4 shows typical total capacitance vs. nominal Zener voltage, estimating ~1.5 pF for 39 V devices at 1 MHz and VR = 1 V. This low value makes it suitable for RF bypass in bias networks but not as a primary filter capacitor-designers should verify with actual board-level measurements if critical.
MMBZ5259BW-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 200 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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
MMBZ5259BW-7-F FAQ
1.How can I place an order for MMBZ5259BW-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5259BW-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 MMBZ5259BW-7-F reliable?
The price and inventory of MMBZ5259BW-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 MMBZ5259BW-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5259BW-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5259BW-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5259BW-7-F?
MMBZ5259BW-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5259BW-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 MMBZ5259BW-7-F?
For technical support, including MMBZ5259BW-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5259BW-7-F requirements.
6.How does Aetrix verify that MMBZ5259BW-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5259BW-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 MMBZ5259BW-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5259BW-7-F?
All MMBZ5259BW-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5259BW-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 MMBZ5259BW-7-F part is unused and in its original packaging.
Return procedure for MMBZ5259BW-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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