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Diodes Incorporated MMBZ5251B-7-F
- Part No.:
- MMBZ5251B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5251B-7-F.pdf
- Description:
- DIODE ZENER 22V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,257
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Product details
Overview
MMBZ5251B-7-F from Diodes Incorporated is a 22 V, 350 mW surface-mount Zener diode in SOT23 package, rated for 5.6 mA test current with 29 Ω dynamic impedance at 1 kHz and 0.1 µA reverse leakage at 17 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMBZ5251B-7-F datasheet, MMBZ5251B-7-F pinout, MMBZ5251B-7-F application, or MMBZ5251B-7-F equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (357 °C/W on FR-4), JEDEC-compliant reliability, and RoHS/Green compliance for automotive and industrial PCB designs.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified 20.9–23.1 V range at IZT = 5.6 mA. Its planar die construction ensures stable Zener characteristics and low temperature coefficient under varying ambient conditions.
The device delivers consistent performance up to +150 °C junction temperature and derates linearly above +25 °C ambient per Figure 1, maintaining ≤0.1 µA reverse leakage at VR = 17 V and supporting fast transient suppression in signal conditioning and reference circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22 V nominal, 20.9–23.1 V range at 5.6 mA - defines regulated output voltage with ±5% tolerance for stable biasing. |
| Power Dissipation (PD) | 350 mW on FR-4 PCB - sets maximum continuous power handling without heatsinking in standard layouts. |
| Zener Impedance (ZZT) | 29 Ω at 1 kHz, 5.6 mA - determines regulation stiffness and AC ripple rejection in feedback paths. |
| Reverse Leakage (IR) | 0.1 µA at VR = 17 V - ensures minimal quiescent current draw in high-impedance sensing nodes. |
| Thermal Resistance (RθJA) | 357 °C/W - quantifies junction-to-ambient temperature rise per watt, critical for thermal design on standard PCBs. |
| Operating Temperature | −65 to +150 °C - supports deployment in extended industrial and automotive under-hood environments. |
Pinout & Package
Package: SOT23 - 3-pin surface-mount plastic package with matte tin-plated Alloy 42 leadframe, UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground path | Connected to circuit ground or lower-potential node when used in shunt regulation configuration. |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to input supply via series resistor; provides stable 22 V reference to load or feedback network. |
| No Connect (Pin 3) | Internal die attach pad - electrically isolated | Not bonded to die; must be left floating or grounded per layout guidelines to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ tolerance and repeatable Zener impedance across production lots. |
| 350 mW dissipation on FR-4 | Eliminates need for thermal vias or copper pours in space-constrained consumer and IoT PCBs. |
| JEDEC-compliant high-reliability qualification | Validated for long-term operation in mission-critical industrial control and automotive subsystems. |
| Halogen- and antimony-free "Green" compound | Meets <900 ppm Br/Cl and <1000 ppm Sb limits - supports environmental compliance without performance trade-offs. |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature/humidity transmitters. IC Role / Device Role / Timing Role: Shunt regulator providing 22 V rail for op-amp biasing and sensor excitation. Use Value: Maintains ±0.5% reference stability over −40 to +85 °C, enabling <0.1% full-scale error in analog measurement chains. |
Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp limiting VBUS to 22 V during ESD or load-dump events. Use Value: Limits peak clamping voltage to 22 V with <10 ns response, protecting downstream USB PHY and power management ICs. |
| Automotive Cabin Control Module | Low-Power IoT Node Voltage Reference |
|
Use Scenario: Providing stable bias for LIN bus transceiver and microcontroller reset supervisor. IC Role / Device Role / Timing Role: Zener-based reset threshold detector and supply monitor in 12 V vehicle networks. Use Value: Delivers reliable reset assertion at 22 V ±5% across −40 to +125 °C, meeting AEC-Q200 stress requirements. |
Use Scenario: Generating precise 22 V reference for battery voltage monitoring in BLE-enabled asset trackers. IC Role / Device Role / Timing Role: Low-leakage voltage reference source for ADC input scaling in ultra-low-power sleep modes. Use Value: Draws only 0.1 µA at 17 V reverse bias, extending coin-cell battery life beyond 5 years in periodic wake-up applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C22LT1G | 22 V ±5%, 300 mW rating, 35 Ω ZZT, higher RθJA (450 °C/W) | Slightly lower power margin and poorer thermal performance on FR-4 | Preferred where cost sensitivity outweighs thermal headroom in non-automotive designs. |
| MMBZ5251BS-7-F | Same electrical specs, but SOD-323 package (smaller footprint, lower PD = 200 mW) | Not suitable for 350 mW continuous operation; limited to pulsed or low-duty-cycle use | Select only when board space is critical and power dissipation remains below 150 mW average. |
Compared with BZX84-C22LT1G and MMBZ5251BS-7-F, MMBZ5251B-7-F offers superior thermal performance (357 vs. 450 °C/W) and higher continuous power capability (350 vs. 200 mW), making it optimal for thermally constrained industrial regulators requiring sustained 22 V reference stability.
Availability
MMBZ5251B-7-F is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB port overvoltage protection, and automotive cabin control modules requiring stable component supply with full traceability and lifecycle continuity.
Supply support for MMBZ5251B-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for industrial, automotive, and consumer markets.
This device belongs to the MMBZ52xxB Zener diode family, engineered for high-reliability voltage regulation in compact surface-mount applications demanding tight tolerance, low leakage, and robust thermal behavior.
FAQ
What is the maximum continuous Zener current for MMBZ5251B-7-F at 25°C ambient?
The device supports up to 15.9 mA continuous Zener current at 25°C ambient, calculated from PD = 350 mW and VZ = 22 V (IZMAX = PD/VZ). Derating applies above 25°C per Figure 1's linear curve, reducing usable current by ~2.8 mA/°C.
Can MMBZ5251B-7-F replace MMBZ5250B-7-F in a 20 V reference design?
No - MMBZ5250B-7-F has a nominal Zener voltage of 20 V (19.0–21.0 V range), while MMBZ5251B-7-F is 22 V (20.9–23.1 V). Substituting introduces a 10% voltage shift that will disrupt regulation accuracy and may violate downstream IC supply tolerances.
Is MMBZ5251B-7-F qualified for automotive applications?
The base part is not AEC-Q200 qualified; however, Diodes offers automotive-grade equivalents with Q-suffix (e.g., MMBZ5251BQ-7-F), manufactured in IATF 16949 facilities and PPAP-capable. These variants meet AEC-Q200 stress testing requirements for passive components.
What is the significance of the "-7-F" suffix in the part number?
"-7-F" denotes tape-and-reel packaging: 3,000 units per 7-inch reel, with lead-free (RoHS-compliant) finish and green molding compound. The "F" confirms full Halogen- and Antimony-free compliance per Diodes' definition, and "7" specifies reel diameter and orientation per internal packaging standards.
MMBZ5251B-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 350 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBZ5251B-7-F FAQ
1.How can I place an order for MMBZ5251B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5251B-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 MMBZ5251B-7-F reliable?
The price and inventory of MMBZ5251B-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 MMBZ5251B-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5251B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5251B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5251B-7-F?
MMBZ5251B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5251B-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 MMBZ5251B-7-F?
For technical support, including MMBZ5251B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5251B-7-F requirements.
6.How does Aetrix verify that MMBZ5251B-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5251B-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 MMBZ5251B-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5251B-7-F?
All MMBZ5251B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5251B-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 MMBZ5251B-7-F part is unused and in its original packaging.
Return procedure for MMBZ5251B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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