My Inquiry
My Account
Diodes Incorporated MMBZ5256BW-7
- Part No.:
- MMBZ5256BW-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
MMBZ5256BW-7.pdf
- Description:
- DIODE ZENER 30V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:5,465
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MMBZ5256BW-7 from Diodes Incorporated is a 30 V, 200 mW surface-mount Zener diode in SOT323 package, rated for 4.2 mA test current, with 49 Ω dynamic impedance at 1 kHz and ≤0.1 μA reverse leakage at 23 V, used for precision voltage regulation and overvoltage protection in low-power analog sensor interfaces.
For engineers reviewing the MMBZ5256BW-7 datasheet, MMBZ5256BW-7 pinout, MMBZ5256BW-7 application, or MMBZ5256BW-7 equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (625 °C/W), AEC-Q101 qualification, green halogen-free construction, and SOT323 footprint compatibility with automated assembly.
Technical Context
This device operates as a two-terminal voltage reference, clamping reverse-biased voltage to 30 V within ±5% tolerance across 28.5–31.5 V range at 4.2 mA test current. Its 49 Ω Zener impedance at 1 kHz ensures stable regulation under small-signal load variations.
Designed for ambient temperatures from –65 °C to +150 °C, it delivers 200 mW power dissipation on FR4 PCB with recommended pad layout, derating linearly above +25 °C per Fig. 1, and exhibits ≤0.1 μA reverse leakage at VR = 23 V - critical for low-current bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 30 V - precise DC reference point for voltage supervision or biasing |
| Zener Voltage Range | 28.5 V to 31.5 V - ±5% tolerance band at 4.2 mA, enabling robust design margin |
| Power Dissipation | 200 mW - maximum steady-state power handling on standard FR4 layout |
| Zener Impedance | 49 Ω @ 1 kHz - low AC impedance ensures minimal regulation error under dynamic load |
| Reverse Leakage Current | ≤0.1 μA @ 23 V - negligible standby current in high-impedance sensing nodes |
| Thermal Resistance | 625 °C/W - defines junction-to-ambient temperature rise per watt dissipated |
| Package | SOT323 - 3-pin surface-mount outline with 0.65 mm pitch, compatible with fine-pitch reflow |
Pinout & Package
Package: SOT323 - ultra-small plastic surface-mount case (2.10 × 1.30 × 0.90 mm), matte tin-plated Alloy 42 leadframe, moisture sensitivity level 1, weight ≈ 0.006 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower potential side in reverse-bias regulation configuration |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher potential side; voltage referenced to this node during regulation |
| Case / Heat Sink (Pin 3) | Non-functional mechanical tab | Internally unconnected; serves only as mechanical anchor and thermal mass |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified reliability | Validated for automotive-grade operation including temperature cycling and HTRB |
| Halogen- and antimony-free "Green" compound | <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - meets strict environmental compliance mandates |
| Lead-free and RoHS compliant | No purposely added lead; fully compliant with EU Directive 2011/65/EU |
| Optimized for automated assembly | SOT323 footprint supports high-speed pick-and-place and reflow soldering |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) Voltage Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature/humidity transmitters. IC Role / Device Role / Timing Role: Zener diode providing fixed 30 V rail for op-amp bias and ADC reference scaling. Use Value: Tight ±5% voltage tolerance and sub-0.1 μA leakage preserve measurement accuracy and battery life in always-on nodes. | Use Scenario: Overvoltage suppression on LIN bus interface supply lines exposed to load-dump transients. IC Role / Device Role / Timing Role: Shunt regulator clamping transient spikes to protect downstream CAN/LIN transceivers. Use Value: 200 mW rating and 625 °C/W thermal resistance enable reliable energy absorption without thermal runaway. |
| Portable Medical Pulse Oximeter Power Rail | Smart Meter Analog Front-End Protection |
Use Scenario: Regulating isolated 3.3 V LDO input derived from micro-power boost converter. IC Role / Device Role / Timing Role: Precision voltage reference stabilizing feedback loop of low-noise LDO. Use Value: 49 Ω Zener impedance minimizes output ripple under varying sensor load currents. | Use Scenario: Protecting metrology ADC inputs from ESD and surge events on current transformer outputs. IC Role / Device Role / Timing Role: Low-leakage shunt clamp limiting input voltage to safe levels before signal conditioning. Use Value: ≤0.1 μA reverse leakage avoids loading high-impedance CT secondary windings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C30LT1G | Same 30 V nominal Zener, but 350 mW rating and SOT23 package; 60 Ω Zz vs. 49 Ω | Higher power handling suits intermittent surge conditions; larger SOT23 may not fit space-constrained layouts | Select when surge immunity > precision regulation is primary requirement |
| MMSZ5256ET1G | Same 30 V rating, 500 mW power, SOD-123 package; 40 Ω Zz; 0.1 μA IR @ 23 V | Larger footprint and higher power dissipation support higher continuous current, but less suitable for ultra-compact designs | Choose for cost-sensitive industrial applications where board area is not constrained |
Compared with BZX84-C30LT1G and MMSZ5256ET1G, MMBZ5256BW-7 offers the tightest combination of miniature SOT323 size, AEC-Q101 qualification, and lowest Zener impedance (49 Ω), making it optimal for space-limited automotive and portable medical designs requiring stable low-current regulation.
Availability
MMBZ5256BW-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive body control modules, and portable medical pulse oximeter power rails requiring stable component supply and long-term lifecycle assurance.
Supply support for MMBZ5256BW-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.
The MMBZ52xxBW series belongs to Diodes' precision Zener diode product line, engineered specifically for high-reliability, low-power voltage reference and protection in automotive, industrial, and portable electronics.
FAQ
What is the maximum reverse voltage (VR) at which MMBZ5256BW-7 guarantees ≤0.1 μA leakage?
The datasheet specifies ≤0.1 μA reverse leakage current at VR = 23 V. This value is measured under standard test conditions (TA = +25°C) and defines the upper limit of applied reverse voltage before leakage rises significantly - critical for maintaining accuracy in high-impedance bias networks.
Does MMBZ5256BW-7 have a cathode stripe marking, and how is polarity identified on the SOT323 package?
Yes - the SOT323 package features a cathode stripe on the top surface adjacent to Pin 2. Per the datasheet top view diagram, the marking "KM1" appears next to the cathode stripe, and Pin 1 (anode) is located at the opposite end of the same edge. Polarity must be verified using optical inspection before placement.
Can MMBZ5256BW-7 be used in place of a 24 V Zener diode in a 5 V regulator feedback network?
No - MMBZ5256BW-7 is a fixed 30 V Zener and cannot substitute for a 24 V device in feedback networks without altering loop gain and regulation setpoint. Its 28.5–31.5 V range is incompatible with 24 V design targets; use MMBZ5252BW-7 (24 V) instead.
Is MMBZ5256BW-7 suitable for protecting USB data lines against ESD?
No - this is a general-purpose Zener diode, not an ESD protection device. It lacks specified ESD ratings (e.g., IEC 61000-4-2), low capacitance (<10 pF), or fast response time required for data-line protection. Use dedicated TVS diodes like D3V3M1U2UP-7 for USB 2.0 line protection.
MMBZ5256BW-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-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:
- SOT-323
MMBZ5256BW-7 FAQ
1.How can I place an order for MMBZ5256BW-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5256BW-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 MMBZ5256BW-7 reliable?
The price and inventory of MMBZ5256BW-7 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 is usually 5 days.
3.What payment methods are accepted for MMBZ5256BW-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5256BW-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5256BW-7?
MMBZ5256BW-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5256BW-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 MMBZ5256BW-7?
For technical support, including MMBZ5256BW-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5256BW-7 requirements.
6.How does Aetrix verify that MMBZ5256BW-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5256BW-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 MMBZ5256BW-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5256BW-7?
All MMBZ5256BW-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5256BW-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 MMBZ5256BW-7 part is unused and in its original packaging.
Return procedure for MMBZ5256BW-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5256BW-7 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
