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Diodes Incorporated MMSZ5256BS-7
- Part No.:
- MMSZ5256BS-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5256BS-7.pdf
- Description:
- DIODE ZENER 30V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,175
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Product details
Overview
MMSZ5256BS-7 from Diodes Incorporated is a surface-mount 30 V Zener diode in SOD-323 package, rated for 200 mW power dissipation, with nominal Zener voltage 30 V (min 28.5 V, max 31.5 V) at 4.2 mA test current, 49 Ω dynamic impedance at 1 mA, and reverse leakage ≤0.1 µA at 23 V, used for precision voltage regulation and reference in low-power analog circuits.
For engineers reviewing the MMSZ5256BS-7 datasheet, MMSZ5256BS-7 pinout, MMSZ5256BS-7 application, or MMSZ5256BS-7 equivalent, key selection criteria include Zener voltage tolerance, low leakage at derated reverse voltage, thermal resistance (625 °C/W), and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or supply conditions. It features planar die construction for consistent breakdown characteristics and low capacitance (≈15 pF at 0 V bias), making it suitable for DC reference and noise-sensitive biasing applications.
Its thermal performance is defined for mounting on standard FR-4 PCBs with recommended pad layout (AP02001); power derating begins above +25°C ambient, reaching zero dissipation at +150°C. The device is fully RoHS-compliant, halogen- and antimony-free, with matte tin-plated Alloy 42 leadframe.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30 V nominal (28.5–31.5 V range at IZT = 4.2 mA); ensures tight regulation tolerance for 3.3 V/5 V rail monitoring or feedback networks. |
| Power Dissipation (PD) | 200 mW at TA = +25°C; limits continuous current to ~6.7 mA at 30 V, defining safe operating envelope in low-power references. |
| Zener Impedance (ZZT) | 49 Ω at IZT = 4.2 mA; indicates moderate AC impedance-acceptable for DC biasing but not high-frequency regulation. |
| Reverse Leakage (IR) | ≤0.1 µA at VR = 23 V; enables ultra-low quiescent current operation in battery-backed voltage references. |
| Thermal Resistance (RθJA) | 625 °C/W on FR-4 board; requires thermal-aware layout-e.g., copper pour-to sustain full power near ambient limits. |
| Package | SOD-323 (2.3–2.7 mm length, 1.2–1.4 mm width); compatible with 0805 footprint and standard pick-and-place equipment. |
Pinout & Package
Package: SOD-323 - surface-mount plastic case, cathode indicated by band, weight ≈ 0.004 g, moisture sensitivity level 1 per J-STD-020D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; forms reference ground return path in shunt regulator topology. |
| Cathode | Zener breakdown terminal / voltage reference output | Connected to input supply via series resistor; delivers stable 30 V reference when reverse-biased above breakdown threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable Zener voltage distribution and long-term stability under thermal cycling. |
| Low reverse leakage (≤0.1 µA) | Minimizes error current in high-impedance reference dividers, preserving accuracy in precision ADC bias networks. |
| SOD-323 package | Enables high-density placement and compatibility with reflow soldering profiles for cost-effective mass production. |
| Halogen- and antimony-free "Green" design | Meets strict environmental compliance (Br+Cl <1500 ppm, Sb <1000 ppm) without sacrificing electrical performance. |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Reference |
|---|---|
Use Scenario: Providing stable 30 V reference for op-amp-based bridge sensor excitation in factory automation transmitters. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise excitation voltage for strain gauge bridges. Use Value: Low leakage (<0.1 µA) prevents loading of high-impedance Wheatstone bridge outputs, maintaining measurement linearity. |
Use Scenario: Generating auxiliary 30 V reference for PD controller feedback loop during 20 V/3 A negotiation phase. IC Role / Device Role / Timing Role: Passive voltage clamp and reference node stabilizer in isolated feedback path. Use Value: Tight 28.5–31.5 V tolerance ensures accurate detection of PDO voltage thresholds within USB PD specification margins. |
| Medical Wearable Battery Monitoring | Automotive Body Control Module (BCM) Wake-Up Circuit |
Use Scenario: Biasing comparator input for Li-ion cell overvoltage detection in compact ECG patch devices. IC Role / Device Role / Timing Role: Low-current Zener reference enabling nanoamp-level sleep-mode monitoring. Use Value: 0.1 µA leakage at 23 V allows >10-year battery life in always-on voltage supervision circuits. |
Use Scenario: Setting wake-up threshold for CAN transceiver enable logic during vehicle ignition-off state. IC Role / Device Role / Timing Role: Voltage threshold detector triggering microcontroller wake-up when battery rises above 28.5 V. Use Value: Guaranteed 28.5 V minimum Zener voltage ensures reliable wake-up even after cold cranking voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B30,115 (Nexperia) | Same 30 V nominal, SOD-323, but higher leakage (≤5 µA @ 23 V) and higher ZZT (70 Ω). | Acceptable for non-critical biasing; unsuitable for nanoamp-level monitoring or high-precision references. | Select when cost priority outweighs leakage sensitivity and tighter voltage tolerance is unnecessary. |
| MMBZ5256ELT1G (onsemi) | Identical 30 V rating and SOD-323 package, but slightly wider VZ range (28.0–32.0 V) and higher RθJA (650 °C/W). | Marginally less stable under thermal drift; may require larger copper area for same power handling. | Choose if existing BOM uses onsemi's MMBZ series and cross-qualification time is constrained. |
Compared with BZX384-B30 and MMBZ5256ELT1G, MMSZ5256BS-7 offers the tightest Zener voltage tolerance (±5%), lowest leakage, and best thermal resistance-making it optimal for precision, low-power, and thermally constrained designs where reference stability is critical.
Availability
MMSZ5256BS-7 is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB-C power delivery reference, medical wearable battery monitoring, and automotive BCM wake-up circuits requiring stable component supply and full RoHS/Green compliance.
Supply support for MMSZ5256BS-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
MMSZ5256BS-7 belongs to the MMSZ52xxBS family of general-purpose Zener diodes designed for precision voltage regulation in space-constrained, low-power applications including portable electronics, industrial controls, and automotive subsystems.
FAQ
What is the maximum reverse voltage that can be continuously applied without breakdown?
The MMSZ5256BS-7 has a nominal Zener voltage of 30 V, with guaranteed breakdown occurring between 28.5 V and 31.5 V at 4.2 mA. Continuous reverse voltage below 28.5 V will not cause breakdown; however, the device remains in high-impedance blocking mode up to its rated peak reverse voltage of 30 V (as implied by the 23 V leakage test condition). Exceeding 31.5 V risks uncontrolled conduction and thermal runaway unless current-limited.
Can this Zener diode be used in parallel for higher power handling?
No-MMSZ5256BS-7 should not be paralleled due to inherent Zener voltage tolerances (±5%) and negative temperature coefficients. Even small mismatches cause current hogging, leading to thermal instability and premature failure. For higher power, use a single higher-rated Zener (e.g., 1N4745A) or active regulation instead.
Is the SOD-323 package compatible with IPC-7351B standard footprints?
Yes-the SOD-323 outline matches IPC-7351B generic footprint SOD323_2.7x1.3mm_P1.30mm, with recommended pad dimensions (1.0 × 0.6 mm) and 0.3 mm solder mask opening per Diodes' AP02001 layout guide. Thermal relief and copper pour must follow FR-4 derating curves to maintain 200 mW rating.
Does this part meet AEC-Q200 stress testing requirements for automotive use?
No-MMSZ5256BS-7 is not AEC-Q200 qualified. While it operates across −65°C to +150°C and is used in automotive BCM wake-up circuits, Diodes Incorporated does not certify this specific variant for automotive grade. For AEC-Q200 compliance, consider the automotive-grade BZT52-B30 series (SOD-123) or contact Diodes for qualified alternatives.
MMSZ5256BS-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 49 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 23 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
MMSZ5256BS-7 FAQ
1.How can I place an order for MMSZ5256BS-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5256BS-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 MMSZ5256BS-7 reliable?
The price and inventory of MMSZ5256BS-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5256BS-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5256BS-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5256BS-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5256BS-7?
MMSZ5256BS-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5256BS-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 MMSZ5256BS-7?
For technical support, including MMSZ5256BS-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5256BS-7 requirements.
6.How does Aetrix verify that MMSZ5256BS-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5256BS-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 MMSZ5256BS-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5256BS-7?
All MMSZ5256BS-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5256BS-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 MMSZ5256BS-7 part is unused and in its original packaging.
Return procedure for MMSZ5256BS-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5256BS-7 Tags
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