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Diodes Incorporated MMBZ5256BW-7-F
- Part No.:
- MMBZ5256BW-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
MMBZ5256BW-7-F.pdf
- Description:
- DIODE ZENER 30V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:6,711
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Product details
Overview
MMBZ5256BW-7-F from Diodes Incorporated is a 30 V, 4.2 mA nominal zener diode in SOT323 package, rated for 200 mW power dissipation and 49 Ω zener impedance at test current, used for precision voltage regulation and overvoltage protection in low-power analog and digital supply rails.
For engineers reviewing the MMBZ5256BW-7-F datasheet, MMBZ5256BW-7-F pinout, MMBZ5256BW-7-F application, or MMBZ5256BW-7-F equivalent, key selection criteria include zener voltage tolerance (±5% at 30 V), reverse leakage (<0.1 μA at 23 V), thermal resistance (625 °C/W), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This surface-mount zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its 30 V nominal zener voltage is specified at 4.2 mA test current with ±5% tolerance, and it exhibits 49 Ω dynamic impedance at that point, ensuring predictable regulation behavior in feedback and clamping circuits.
The device uses alloy-42 leadframe with matte tin plating, conforms to J-STD-020D Level 1 moisture sensitivity, and is qualified to AEC-Q101 for high-reliability automotive applications. Its SOT323 package enables compact PCB layout while maintaining thermal performance up to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30 V nominal, 28.5–31.5 V range at 4.2 mA - defines clamping threshold in overvoltage protection circuits |
| Power Dissipation (PD) | 200 mW at TA = 25 °C - limits continuous regulation current to ~6.7 mA at 30 V |
| Zener Impedance (ZZT) | 49 Ω at IZT = 4.2 mA - determines output voltage deviation under load transients |
| Reverse Leakage (IR) | <0.1 μA at VR = 23 V - ensures minimal quiescent current in standby-mode voltage references |
| Thermal Resistance (RθJA) | 625 °C/W on FR4 board - requires derating above 25 °C ambient; full power only at TA ≤ 25 °C |
| Operating Temperature | −65 to +150 °C - supports under-hood automotive and industrial environments without external heatsinking |
Pinout & Package
Package: SOT323 - three-terminal surface-mount plastic package with 0.65 mm pitch, 2.10 mm × 1.30 mm footprint, and 0.30 mm profile; optimized for automated pick-and-place and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to system ground or lower-potential node when used in shunt regulation |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to input rail or signal line requiring clamping or voltage reference |
| Collector / Heat Sink (Pin 3) | Internal die attachment pad / thermal path | Electrically tied to cathode; provides primary thermal conduction path to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress-test requirements including HTOL, TC, and HAST |
| Lead-free & halogen-free | Meets RoHS 2 (2011/65/EU) and Diodes Inc.'s "Green" standard (<900 ppm Br/Cl, <1000 ppm Sb) |
| SOT323 package | 0.006 g weight and 2.10 × 1.30 mm footprint enable high-density routing in space-constrained modules |
| Level 1 moisture sensitivity | No bake required before reflow; compatible with standard J-STD-020D assembly processes |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage clamping on LIN bus transceiver supply rail exposed to load-dump transients. IC Role / Device Role / Timing Role: Shunt zener regulator protecting 3.3 V LDO input against >30 V surges. Use Value: Limits peak rail voltage to 31.5 V with <0.1 μA leakage, preserving LDO integrity without adding series resistance. | Use Scenario: Precision reference for 12-bit ADC measuring 0–24 V battery voltage in predictive maintenance sensor nodes. IC Role / Device Role / Timing Role: Stable 30 V reference source for ratiometric scaling of divider output. Use Value: ±5% voltage tolerance and 49 Ω impedance ensure <0.15% full-scale error contribution across temperature. |
| Consumer USB-C Power Delivery Monitor | Medical Portable Diagnostic Device |
Use Scenario: Overvoltage detection on VBUS monitoring path during fast-charging negotiation cycles. IC Role / Device Role / Timing Role: Threshold detector triggering MCU interrupt when VBUS exceeds safe limit. Use Value: Sharp 30 V knee and sub-μA leakage allow direct connection to high-impedance comparator input without loading. | Use Scenario: Backup supply rail stabilization for real-time clock (RTC) during main power brownout events. IC Role / Device Role / Timing Role: Low-current zener shunt maintaining 30 V bias for supercapacitor charging circuit. Use Value: 200 mW rating and −65 °C to +150 °C range support long-term reliability in sealed, fanless enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C30LT1G | Same 30 V nominal, but 350 mW PD, 60 Ω ZZT, SOT23 package | Larger footprint; higher power allows >10 mA regulation current | Select when higher surge handling or legacy SOT23 board compatibility is required |
| MMSZ5256ET1G | Same 30 V, 500 mW PD, 40 Ω ZZT, SOD-123 package | Higher power and lower impedance, but larger 2.9 × 1.7 mm body | Prefer for industrial designs needing margin on thermal derating or tighter regulation stability |
Compared with BZX84-C30LT1G and MMSZ5256ET1G, MMBZ5256BW-7-F offers the smallest footprint (SOT323), AEC-Q101 qualification, and lowest leakage (<0.1 μA), making it optimal for space-constrained automotive and portable medical applications where reliability and size are prioritized over raw power headroom.
Availability
MMBZ5256BW-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, and portable medical diagnostic devices requiring stable component supply with guaranteed long-term sourcing.
Supply support for MMBZ5256BW-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, manufacturing, and sales operations across Asia, Europe, and North America.
The MMBZ52xxBW series belongs to Diodes' AEC-Q101-qualified zener diode product line, engineered specifically for voltage reference, overvoltage protection, and rail clamping in automotive and industrial systems where reliability and consistency are critical.
FAQ
What is the maximum reverse voltage this zener can withstand before breakdown?
The MMBZ5256BW-7-F has a nominal zener voltage of 30 V, with a guaranteed breakdown range of 28.5 V to 31.5 V at 4.2 mA test current. Below 28.5 V, reverse leakage remains below 0.1 μA at 23 V, confirming stable non-conducting behavior until reaching its specified zener threshold.
Is this part suitable for use in automotive applications?
Yes - MMBZ5256BW-7-F is explicitly qualified to AEC-Q101 standards, including high-temperature operating life, temperature cycling, and humidity testing. Its −65 °C to +150 °C operating range and green, lead-free construction meet automotive electronics requirements for under-hood and cabin modules.
How does the SOT323 package affect thermal performance?
The SOT323 package delivers 625 °C/W junction-to-ambient thermal resistance on standard FR4 PCBs with recommended pad layout. This means at 25 °C ambient, full 200 mW dissipation is possible, but power must be linearly derated by 0.32 mW/°C above 25 °C to avoid exceeding 150 °C junction temperature.
Can this zener replace older through-hole 1N5256B parts in new designs?
Yes - MMBZ5256BW-7-F matches the 30 V zener voltage and electrical characteristics of the 1N5256B, but in SOT323 surface-mount format. It offers identical regulation performance with improved manufacturability, smaller footprint, and AEC-Q101 qualification, though PCB layout and thermal design must accommodate the SMT package's lower thermal mass and different pad geometry.
MMBZ5256BW-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):
- 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:
- SOT-323
MMBZ5256BW-7-F FAQ
1.How can I place an order for MMBZ5256BW-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5256BW-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 MMBZ5256BW-7-F reliable?
The price and inventory of MMBZ5256BW-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 MMBZ5256BW-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5256BW-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5256BW-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5256BW-7-F?
MMBZ5256BW-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5256BW-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 MMBZ5256BW-7-F?
For technical support, including MMBZ5256BW-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5256BW-7-F requirements.
6.How does Aetrix verify that MMBZ5256BW-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5256BW-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 MMBZ5256BW-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5256BW-7-F?
All MMBZ5256BW-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5256BW-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 MMBZ5256BW-7-F part is unused and in its original packaging.
Return procedure for MMBZ5256BW-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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