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Diodes Incorporated MMBZ5251BW-7-F
- Part No.:
- MMBZ5251BW-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
MMBZ5251BW-7-F.pdf
- Description:
- DIODE ZENER 22V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:8,667
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Product details
Overview
MMBZ5251BW-7-F from Diodes Incorporated is a 22 V, 200 mW surface-mount Zener diode in SOT323 package, with nominal Zener voltage tolerance ±5%, dynamic impedance 29 Ω at 5.6 mA test current, and maximum reverse leakage of 0.1 μA at 17 V. It provides precision voltage regulation in low-power biasing and reference circuits for automotive sensor interfaces and industrial signal conditioning.
For engineers reviewing the MMBZ5251BW-7-F datasheet, MMBZ5251BW-7-F pinout, MMBZ5251BW-7-F application, or MMBZ5251BW-7-F equivalent, key selection criteria include Zener voltage accuracy, low leakage at rated VR, thermal resistance (625 °C/W), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain stable voltage across its terminals under controlled current. Its 22 V nominal Zener voltage is specified at 5.6 mA test current, with dynamic impedance measured at 1 kHz and thermal derating defined per Figure 1 (200 mW at 25°C, linearly reduced above 25°C).
The SOT323 package enables high-density PCB layout and compatibility with automated reflow assembly. Polarity is marked on the top surface per schematic diagram, and the device uses matte tin-plated Alloy 42 leads for solderability per MIL-STD-202, Method 208.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22 V nominal, 20.9–23.1 V range at IZT = 5.6 mA - defines regulated output voltage tolerance in reference circuits |
| Power Dissipation (PD) | 200 mW at TA = 25°C - sets maximum continuous power handling before thermal derating applies |
| Zener Impedance (ZZT) | 29 Ω at IZT = 5.6 mA, f = 1 kHz - determines voltage regulation stability under varying load current |
| Reverse Leakage (IR) | 0.1 μA max at VR = 17 V - ensures minimal parasitic current in high-impedance bias networks |
| Thermal Resistance (RθJA) | 625 °C/W on FR4 board with recommended pad layout - informs junction temperature rise under operating power |
| Operating Temperature | −65°C to +150°C - supports deployment in under-hood automotive and industrial environments |
| AEC-Q101 Qualified | Yes - confirms reliability for automotive electronics per stress-test requirements including HTGB, HTRB, and TCT |
Pinout & Package
Package: SOT323 - ultra-small plastic surface-mount case (2.10 mm × 1.30 mm × 0.90 mm), lead-free, halogen-free, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / cathode reference point in reverse-biased configuration | Connected to lower-potential node when used as shunt regulator; polarity marked on top surface per datasheet diagram |
| Cathode | Reverse breakdown terminal / voltage reference output | Connected to regulated voltage rail; carries Zener current during regulation; marked with band or "K" symbol |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and body electronics |
| Low reverse leakage (0.1 μA) | Enables use in high-impedance voltage divider networks without significant error contribution |
| SOT323 footprint | Supports >2× higher board density vs. DO-35 or SOD-123; compatible with standard 0805 reflow profiles |
| Green molding compound (UL 94V-0) | Meets RoHS 2 and halogen-free standards (<900 ppm Br/Cl, <1000 ppm Sb) for eco-compliant manufacturing |
Applications
| Automotive Sensor Biasing | Industrial Analog Signal Conditioning |
|---|---|
Use Scenario: Providing stable 22 V bias to Hall-effect position sensors in transmission control units. IC Role / Device Role / Timing Role: Shunt voltage reference regulating supply rail for analog front-end circuitry. Use Value: Maintains sensor linearity over −40°C to +125°C ambient with <±5% voltage drift due to tight Zener tolerance and AEC-Q101 thermal cycling validation. | Use Scenario: Setting reference voltage for 12-bit ADC input scaling in programmable logic controller (PLC) analog I/O modules. IC Role / Device Role / Timing Role: Precision DC reference source for ratiometric measurement circuits. Use Value: Enables <0.1% full-scale error contribution via 0.1 μA leakage and 29 Ω dynamic impedance, minimizing gain error in high-Z divider networks. |
| Low-Power Microcontroller Reset Circuit | ESD-Protected Interface Voltage Clamp |
Use Scenario: Generating clean reset threshold for 32-bit ARM Cortex-M microcontrollers in battery-powered telemetry nodes. IC Role / Device Role / Timing Role: Threshold detector in RC-based power-on reset generator. Use Value: Ensures deterministic reset assertion at 22 V ±0.5 V across temperature, leveraging tight 20.9–23.1 V VZ window and low thermal coefficient. | Use Scenario: Clamping transient overvoltage on RS-485 data lines exposed to lightning-induced surges in building automation systems. IC Role / Device Role / Timing Role: Secondary protection element downstream of TVS diodes, absorbing residual energy below clamping threshold. Use Value: Limits steady-state fault voltage to 22 V with 200 mW dissipation capability, preventing latch-up in transceiver ICs during sustained overvoltage events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C22LT1G | Zener voltage 22 V ±5%, PD = 300 mW, RθJA = 357 °C/W, SOT-23 package | Higher power rating but larger footprint; not AEC-Q101 qualified | Select when higher continuous power margin is required and automotive qualification is not mandatory |
| MMSZ5251ET1G | Zener voltage 22 V ±5%, PD = 500 mW, RθJA = 417 °C/W, SOD-123 package | Larger case size increases board area; lacks AEC-Q101 certification | Choose for cost-sensitive industrial designs where thermal performance allows larger package and qualification is optional |
Compared with BZX84-C22LT1G and MMSZ5251ET1G, MMBZ5251BW-7-F offers AEC-Q101 qualification and SOT323 miniaturization at the expense of lower power rating-making it optimal for space-constrained, automotive-grade voltage reference needs where 200 mW suffices.
Availability
MMBZ5251BW-7-F is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial analog signal conditioning, and low-power microcontroller reset circuits requiring stable component supply and long-term lifecycle support.
Supply support for MMBZ5251BW-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 portfolio, engineered specifically for precision voltage reference and regulation in harsh-environment automotive and industrial control systems.
FAQ
What is the maximum reverse voltage (VR) at which leakage remains ≤0.1 μA?
The MMBZ5251BW-7-F guarantees reverse leakage ≤0.1 μA at VR = 17 V, as specified in the Electrical Characteristics table. At voltages below 17 V, leakage decreases exponentially; operation above 17 V but below 22 V may increase leakage beyond this limit and is not recommended for precision reference use.
Can this Zener diode be used in parallel for higher power dissipation?
No-MMBZ5251BW-7-F must not be paralleled due to mismatched Zener voltage tolerances (±5%) and thermal coupling effects, which cause current hogging and potential thermal runaway. For higher power, select a single higher-rated device such as MMSZ5251ET1G (500 mW) or implement active regulation.
Is the SOT323 package compatible with standard reflow soldering profiles?
Yes-the SOT323 package is qualified for lead-free reflow per J-STD-020D Level 1 moisture sensitivity, with peak temperatures up to 260°C. Diodes Incorporated recommends using the pad layout from AP02001 and verifying thermal profile against JEDEC J-STD-020 to avoid delamination or voiding.
Does the "-7-F" suffix indicate tape-and-reel packaging only, or does it affect electrical performance?
The "-7-F" suffix denotes SOT323 packaging in 3000-unit tape-and-reel format and confirms lead-free, RoHS-compliant plating (matte tin over Alloy 42). It has no effect on electrical parameters-performance matches the base MMBZ5251BW part number exactly, as confirmed in the Ordering Information section of DS31037 Rev. 14-2.
MMBZ5251BW-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):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 29 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 17 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
MMBZ5251BW-7-F FAQ
1.How can I place an order for MMBZ5251BW-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5251BW-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 MMBZ5251BW-7-F reliable?
The price and inventory of MMBZ5251BW-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 MMBZ5251BW-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5251BW-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5251BW-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5251BW-7-F?
MMBZ5251BW-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5251BW-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 MMBZ5251BW-7-F?
For technical support, including MMBZ5251BW-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5251BW-7-F requirements.
6.How does Aetrix verify that MMBZ5251BW-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5251BW-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 MMBZ5251BW-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5251BW-7-F?
All MMBZ5251BW-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5251BW-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 MMBZ5251BW-7-F part is unused and in its original packaging.
Return procedure for MMBZ5251BW-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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