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Diodes Incorporated MMSZ5259BS-7-F
- Part No.:
- MMSZ5259BS-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5259BS-7-F.pdf
- Description:
- DIODE ZENER 39V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,116
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Product details
Overview
MMSZ5259BS-7-F from Diodes Incorporated is a surface-mount Zener diode with a nominal zener voltage of 39 V, ±2.5% tolerance (37.05–40.95 V), 200 mW power dissipation, and 80 Ω zener impedance at 3.2 mA test current. It operates across –65 °C to +150 °C and is used for precision voltage regulation and overvoltage protection in low-power analog signal conditioning circuits.
For engineers reviewing the MMSZ5259BS-7-F datasheet, MMSZ5259BS-7-F pinout, MMSZ5259BS-7-F application, or MMSZ5259BS-7-F equivalent, key selection criteria include its SOD-323 package footprint, 30 V reverse leakage threshold, 0.9 V forward voltage at 10 mA, and thermal resistance of 625 °C/W - all critical for compact, thermally constrained PCB designs.
Technical Context
This Zener diode employs planar die construction for stable breakdown characteristics and low dynamic impedance. Its 39 V nominal zener voltage is specified at 3.2 mA test current, with maximum zener impedance of 80 Ω measured at 1 kHz and minimum reverse breakdown occurring at 30 V.
The device is optimized for general-purpose voltage reference and clamping in space-constrained applications. Its SOD-323 package supports automated assembly and provides a cathode band polarity indicator, with moisture sensitivity level 1 per J-STD-020D and fully RoHS-compliant, halogen-free construction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 39 V - precise DC reference point for regulation or clamping at typical bias conditions |
| Zener Voltage Range | 37.05–40.95 V - ±2.5% tolerance ensures predictable trip or reference behavior in production |
| Test Current (IZT) | 3.2 mA - standardized operating point for verifying zener voltage and impedance specs |
| Zener Impedance (ZZT) | 80 Ω - low dynamic resistance maintains stable voltage under small-signal AC variations |
| Power Dissipation (PD) | 200 mW - limits continuous DC power handling on standard FR-4 PCB with recommended pad layout |
| Reverse Leakage (IR) | 0.1 µA @ 30 V - negligible off-state current enables high-impedance sensing and low-quiescent circuits |
| Forward Voltage (VF) | 0.9 V @ 10 mA - defines conduction threshold when used in bidirectional protection or series bias paths |
Pinout & Package
Package: SOD-323 - ultra-compact surface-mount plastic case (2.3–2.7 mm length, 1.2–1.4 mm width, 0.25–0.35 mm thickness), UL 94V-0 rated, with cathode band marking and matte tin-plated Alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower potential node in zener mode | Accepts forward current up to 10 mA; forms reference ground return path in shunt regulator topologies |
| Cathode | Current exit terminal in forward bias; connected to higher potential node in zener mode | Provides regulated output node; marked by visible band; must be biased above anode by ≥39 V for breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable zener voltage distribution and long-term stability under thermal cycling |
| SOD-323 package | Enables 0.65 mm² board area usage and compatibility with fine-pitch reflow processes |
| Lead-free & RoHS compliant | Meets EU Directive 2011/65/EU without exemptions; suitable for consumer and industrial end-equipment |
| Halogen- and antimony-free | Contains <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - satisfies green manufacturing and disposal requirements |
| Moisture sensitivity Level 1 | No dry-pack or baking required before assembly - reduces manufacturing overhead and handling risk |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Clamp |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 4–20 mA transmitter front-end op-amps in harsh ambient environments. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 39 V rail for precision current source biasing. Use Value: Maintains <±0.5% output drift over –40 °C to +85 °C due to low tempco and 80 Ω zener impedance. |
Use Scenario: Protecting USB 2.0 data lines (D+/D−) against ESD-induced transients exceeding 30 V. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor configured as back-to-back Zener pair. Use Value: Limits clamping voltage to ≤41 V with sub-100 ns response, leveraging 0.1 µA leakage at 30 V to avoid signal loading. |
| Low-Power IoT Node Power Monitor | Programmable Logic Supply Clamp |
|
Use Scenario: Monitoring 3.3 V system rail integrity via resistive divider into ADC, with fault detection at 39 V overvoltage. IC Role / Device Role / Timing Role: High-impedance overvoltage detector triggering MCU interrupt on rail excursion. Use Value: Draws only 0.1 µA at 30 V, enabling battery-operated operation for >10 years without measurable drain. |
Use Scenario: Preventing FPGA I/O bank damage during hot-swap or supply sequencing faults. IC Role / Device Role / Timing Role: Standby-mode clamp holding VCCIO within safe margin during power-up/down transitions. Use Value: Activates at 39 V with 80 Ω impedance, limiting overshoot to <42 V while dissipating <200 mW peak energy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C39 | Same 39 V nominal rating, but SOD-523 package (smaller footprint); 300 mW PD; 90 Ω ZZT | Higher power handling suits intermittent surge clamping; smaller size increases placement density but reduces thermal mass | Select when board space is critical and transient energy exceeds 200 mW capability |
| MMBZ5259BS | Identical electrical specs and SOD-323 package, but dual-diode configuration (common-cathode pair) | Enables bidirectional clamping or dual-rail referencing in same footprint; adds 0.2 mm height and 0.001 g weight | Select when dual-channel protection or matched-pair referencing is required without increasing layout area |
Compared with BZX584-C39 and MMBZ5259BS, MMSZ5259BS-7-F offers optimal balance of thermal performance (625 °C/W), industry-standard SOD-323 compatibility, and lowest cost per unit in tape-and-reel packaging - making it preferred for single-rail, cost-sensitive, high-volume regulation tasks.
Availability
MMSZ5259BS-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB port protection, low-power IoT monitoring, and FPGA I/O clamping requiring stable component supply and full traceability.
Supply support for MMSZ5259BS-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, with design and manufacturing operations across Asia and the Americas.
The MMSZ52xxBS series targets cost-effective, high-reliability voltage reference and protection in consumer, computing, and industrial applications - emphasizing small footprint, environmental compliance, and automated assembly readiness.
FAQ
What is the maximum reverse voltage before breakdown for MMSZ5259BS-7-F?
The device exhibits sharp reverse breakdown starting at 37.05 V (minimum zener voltage) and is fully regulated between 37.05 V and 40.95 V at 3.2 mA test current. At 30 V reverse bias, leakage remains ≤0.1 µA - confirming no significant conduction below the specified range.
Can MMSZ5259BS-7-F be used in place of a 36 V Zener diode?
No - its nominal zener voltage is 39 V with a guaranteed range of 37.05–40.95 V. Substituting it for a 36 V part (e.g., MMSZ5258BS) would raise the regulation or clamping threshold by ≥1.05 V, potentially violating circuit safety margins or reference accuracy requirements.
Is thermal derating required for operation above 25°C ambient?
Yes - power dissipation must be linearly derated above 25°C using the 625 °C/W thermal resistance. For example, at 75°C ambient, maximum allowable power drops to 100 mW (200 mW × [1 − (75−25)/625]). Derating follows the curve in Figure 1 of DS31038 Rev. 13-2.
Does MMSZ5259BS-7-F have a specified temperature coefficient?
No - the datasheet does not list a temperature coefficient (tempco) value. However, typical zener diodes in this voltage range (≥30 V) exhibit positive tempco (~0.05 %/°C), meaning zener voltage increases slightly with temperature - a behavior confirmed by Figure 2's upward curvature in breakdown region.
MMSZ5259BS-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
MMSZ5259BS-7-F FAQ
1.How can I place an order for MMSZ5259BS-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5259BS-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 MMSZ5259BS-7-F reliable?
The price and inventory of MMSZ5259BS-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 MMSZ5259BS-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5259BS-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5259BS-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5259BS-7-F?
MMSZ5259BS-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5259BS-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 MMSZ5259BS-7-F?
For technical support, including MMSZ5259BS-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5259BS-7-F requirements.
6.How does Aetrix verify that MMSZ5259BS-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5259BS-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 MMSZ5259BS-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5259BS-7-F?
All MMSZ5259BS-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5259BS-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 MMSZ5259BS-7-F part is unused and in its original packaging.
Return procedure for MMSZ5259BS-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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