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Diodes Incorporated MMBZ5259BT-7-F
- Part No.:
- MMBZ5259BT-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOT-523
- Datasheet:
-
MMBZ5259BT-7-F.pdf
- Description:
- DIODE ZENER 39V 150MW SOT523
- Quantity:
- Payment:
- Shipping:
Inventory:6,961
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Product details
Overview
MMBZ5259BT-7-F from Diodes Incorporated is a 39 V, 150 mW surface-mount Zener diode in SOT-523 package, rated for 3.2 mA test current, 80 Ω dynamic impedance at 1 kHz, and 0.1 μA reverse leakage at 30 V, used for precision voltage regulation and reference in space-constrained power management circuits.
For engineers reviewing the MMBZ5259BT-7-F datasheet, MMBZ5259BT-7-F pinout, MMBZ5259BT-7-F application, or MMBZ5259BT-7-F equivalent, key selection criteria include nominal Zener voltage tolerance (±2.5%), thermal resistance (833 °C/W), low capacitance (≈4 pF), RoHS-compliant matte tin plating, and suitability for automated SMT assembly on FR-4 PCBs.
Technical Context
This Zener diode employs planar die construction for stable breakdown characteristics and low leakage. It operates within –65 °C to +150 °C and maintains regulation across a 3.2 mA test current with 80 Ω impedance at 1 kHz, supporting stable reference generation under varying load conditions.
The device delivers 39 V nominal regulation with ±2.5% tolerance (37.05–40.95 V), exhibits only 0.1 μA reverse leakage at VR = 30 V, and features ultra-small SOT-523 footprint ideal for portable and high-density DC-DC feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nom) | 39 V - precise regulation point for feedback or clamp circuits |
| Zener Voltage Range | 37.05–40.95 V - ±2.5% tolerance ensures predictable clamping margin |
| Test Current (IZT) | 3.2 mA - standard bias point for specified Zener voltage and impedance |
| Zener Impedance (ZZT) | 80 Ω @ 1 kHz - low dynamic resistance enables stable regulation under small-signal variation |
| Power Dissipation | 150 mW - limits continuous dissipation on standard FR-4 pads without heatsinking |
| Reverse Leakage (IR) | 0.1 μA @ 30 V - minimal standby current preserves battery life in low-power systems |
| Thermal Resistance (RθJA) | 833 °C/W - defines junction-to-ambient temperature rise per watt on recommended layout |
Pinout & Package
Package: SOT-523 - ultra-compact 3-pin surface-mount plastic case (1.6 × 0.8 × 0.5 mm), UL 94V-0 rated, moisture sensitivity level 1, lead-free matte tin finish over Alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener operation; required for forward voltage drop (VF = 0.9 V @ 10 mA) |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher-potential node; defines 39 V reference when reverse biased above knee voltage |
| Case / No Connect | Non-functional mechanical tab | SOT-523 has no internal connection to case; serves only as structural support and thermal path |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SOT-523 footprint | Enables placement in <1.0 mm² board area-critical for wearables and sensor nodes |
| Planar die construction | Ensures repeatable Zener voltage distribution and long-term stability under thermal cycling |
| RoHS-compliant & "Green" molding compound | Halogen-free, Sb₂O₃-free packaging meets IPC-1752 and EU ELV requirements |
| Low 0.1 μA leakage at 30 V | Minimizes quiescent current draw in always-on voltage monitor or battery-backed circuits |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage of isolated flyback or buck converter via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener diode provides stable 39 V reference to TL431 cathode or optocoupler LED anode. Use Value: Tight 37.05–40.95 V tolerance ensures ±1% output regulation accuracy across temperature and line variations. | Use Scenario: Protecting microcontroller I/O pins from transient surges on industrial sensor lines. IC Role / Device Role / Timing Role: Acts as shunt clamp, diverting excess energy above 39 V to ground before IC damage occurs. Use Value: 80 Ω impedance and 150 mW rating allow reliable clamping of short-duration ESD or inductive spikes without thermal runaway. |
| Reference Voltage Source | Battery Voltage Monitor |
Use Scenario: Generating fixed reference for ADC input scaling in portable medical devices. IC Role / Device Role / Timing Role: Provides low-drift 39 V reference to resistor divider network feeding SAR ADC reference pin. Use Value: 0.1 μA leakage avoids loading high-impedance dividers, preserving measurement linearity and SNR. | Use Scenario: Monitoring lithium-ion pack voltage during charging/discharging cycles. IC Role / Device Role / Timing Role: Used in comparator-based threshold detector to trigger charge termination at 39 V system-level cutoff. Use Value: Stable 39 V breakdown enables accurate end-of-charge detection with <±0.5 V error across –40 °C to +85 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C39 | Same 39 V nominal, but SOD-523 package (slightly larger), 100 mW rating, 90 Ω Zz | Lower power handling reduces surge margin in clamp roles; identical tolerance and leakage | Select if legacy SOD-523 footprint compatibility is required and peak power <100 mW |
| MMSZ5259ET1G | SOD-123 package, 500 mW rating, 39 V ±5%, 100 Ω Zz, 0.1 μA IR | Higher power supports sustained clamping; wider voltage tolerance relaxes accuracy-critical references | Select for higher reliability in industrial environments where thermal margin >300 mW is needed |
Compared with BZX584-C39 and MMSZ5259ET1G, MMBZ5259BT-7-F offers the smallest footprint and tightest voltage tolerance among 39 V Zeners, making it optimal for miniaturized, precision-regulated designs where board area and reference accuracy are prioritized over surge power headroom.
Availability
MMBZ5259BT-7-F is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, precision reference generation, and battery monitoring requiring stable component supply and consistent parametric performance across production lots.
Supply support for MMBZ5259BT-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 analog ICs, headquartered in Plano, Texas, serving automotive, industrial, computing, and consumer markets with a focus on high-reliability, AEC-Q qualified components.
The MMBZ52xx series targets space-constrained, cost-sensitive applications requiring stable voltage reference or clamping, with design emphasis on manufacturability, RoHS compliance, and consistent parametric yield in high-volume SMT assembly.
FAQ
What is the maximum continuous Zener current for MMBZ5259BT-7-F?
The device is rated for 150 mW total power dissipation. At its nominal 39 V Zener voltage, this corresponds to a maximum continuous Zener current of approximately 3.85 mA (150 mW ÷ 39 V). Derating applies above 25 °C ambient per the 833 °C/W thermal resistance curve.
Is MMBZ5259BT-7-F suitable for use in automotive applications?
While not AEC-Q200 qualified, the device operates from –65 °C to +150 °C and is RoHS-compliant with green molding compound. It may be used in non-safety-critical automotive subsystems (e.g., infotainment power rails) pending customer qualification per application-specific stress testing and lifetime validation.
How does the SOT-523 package affect thermal performance compared to SOD-123?
SOT-523's smaller pad area and thinner mold compound result in higher thermal resistance (833 °C/W vs. ~300 °C/W for SOD-123), limiting continuous power handling. This requires careful PCB layout with thermal relief and derating above 25 °C ambient to avoid exceeding 150 °C junction temperature.
Can MMBZ5259BT-7-F replace MMBZ5258BT-7-F in existing designs?
Yes, with circuit verification: MMBZ5259BT-7-F (39 V) replaces MMBZ5258BT-7-F (36 V) only if the 3 V increase aligns with system voltage margins. Zener impedance rises from 70 Ω to 80 Ω, and test current drops from 3.4 mA to 3.2 mA-both minor but measurable in precision feedback paths.
MMBZ5259BT-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 150 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-523
MMBZ5259BT-7-F FAQ
1.How can I place an order for MMBZ5259BT-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5259BT-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 MMBZ5259BT-7-F reliable?
The price and inventory of MMBZ5259BT-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 MMBZ5259BT-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5259BT-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5259BT-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5259BT-7-F?
MMBZ5259BT-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5259BT-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 MMBZ5259BT-7-F?
For technical support, including MMBZ5259BT-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5259BT-7-F requirements.
6.How does Aetrix verify that MMBZ5259BT-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5259BT-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 MMBZ5259BT-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5259BT-7-F?
All MMBZ5259BT-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5259BT-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 MMBZ5259BT-7-F part is unused and in its original packaging.
Return procedure for MMBZ5259BT-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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