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Diodes Incorporated MMBZ5257BQ-7-F
- Part No.:
- MMBZ5257BQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5257BQ-7-F.pdf
- Description:
- DIODE ZENER 33V 350MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
MMBZ5257BQ-7-F from Diodes Incorporated is a 33 V, 3.8 mA nominal Zener diode in SOT23 package, rated for 350 mW power dissipation at +25°C ambient on FR-4 PCB, with 700 Ω maximum Zener impedance at 0.25 mA and 0.1 µA reverse leakage at 25 V, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMBZ5257BQ-7-F datasheet, MMBZ5257BQ-7-F pinout, MMBZ5257BQ-7-F application, or MMBZ5257BQ-7-F equivalent, key selection criteria include Zener voltage tolerance (±3.5%), thermal resistance (357 °C/W), JEDEC-compliant reliability, and SOT23-compatible automated assembly compatibility.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation across a defined current range (3.8 mA nominal test current). Its planar die construction ensures consistent breakdown characteristics and low temperature coefficient.
Designed for surface-mount applications, it delivers specified Zener voltage (31.35–34.65 V) under controlled test conditions (IZT = 3.8 mA), with dynamic impedance (ZZT = 58 Ω @ IZT) and knee impedance (ZZK = 700 Ω @ IZK = 0.25 mA) defining regulation linearity and low-current performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 33 V - precise regulation point for 3.3 V rail monitoring or 3.3 V LDO feedback networks |
| Zener Voltage Range | 31.35 V to 34.65 V - ±3.5% tolerance ensures predictable clamping in ESD-coupled signal lines |
| Test Current (IZT) | 3.8 mA - operating point where voltage and impedance are guaranteed per JEDEC standards |
| Zener Impedance (ZZT) | 58 Ω @ 3.8 mA - defines voltage deviation under load transients in reference divider circuits |
| Reverse Leakage (IR) | 0.1 µA @ 25 V - negligible current draw in standby mode for battery-powered sensor nodes |
| Power Dissipation | 350 mW @ TA = +25°C - sets maximum continuous power handling on standard FR-4 layout |
| Thermal Resistance | 357 °C/W - determines junction temperature rise under sustained bias, critical for long-term stability |
Pinout & Package
Package: SOT23 - compact 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 | Connected to system ground or lower-potential node in shunt regulation configuration |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to input supply or protected signal line; maintains 33 V relative to anode |
| No Connect (Pin 3) | Non-functional mechanical support pin | Internally unconnected; serves only as mechanical anchor-must not be biased or loaded |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight Zener voltage distribution and repeatable breakdown behavior across production lots |
| 350 mW FR-4 power rating | Validated thermal performance on standard PCBs without heatsinking or special copper pours |
| Lead-free & RoHS 3 compliant | Fully compliant with EU Directive 2015/863/EU; no intentionally added lead, bromine, chlorine, or antimony |
| SOT23 tape-and-reel packaging | Optimized for high-speed pick-and-place assembly; 3,000 units per reel (Q-7-F suffix denotes automotive-qualified variant) |
Applications
| Industrial Sensor Signal Conditioning | USB-C 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 voltage reference providing 33 V bias to op-amp gain-setting network. Use Value: Maintains <±0.5% reference drift over −40°C to +85°C due to low thermal resistance and tight voltage tolerance. |
Use Scenario: Clamping transient surges on USB-C CC lines during hot-plug events. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp limiting CC line to 33 V during 100 V/1 µs ESD pulses. Use Value: Limits peak voltage within USB PD specification limits using 0.1 µA leakage to minimize quiescent current drain. |
| Automotive Body Control Module (BCM) Power Monitoring | IoT Node Battery Voltage Supervision |
|
Use Scenario: Detecting undervoltage/overvoltage conditions on 24 V vehicle battery rails. IC Role / Device Role / Timing Role: Zener-based comparator input threshold set to 33 V for overvoltage alarm triggering. Use Value: Enables AEC-Q200-compliant monitoring with validated JEDEC reliability and IATF 16949 manufacturing traceability. |
Use Scenario: Monitoring Li-SOCl₂ primary cell voltage decay in remote asset trackers. IC Role / Device Role / Timing Role: Low-leakage voltage reference in resistive divider feeding microcontroller ADC. Use Value: Extends 10-year battery life via 0.1 µA IR at 25 V, reducing divider current by >95% vs. standard Zeners. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C33-7-F | Same 33 V nominal, but 300 mW rating and higher ZZT (90 Ω @ 5 mA); SOT23 package with different marking code | Limited to lower-power applications due to reduced power margin; less suitable for sustained 3.8 mA operation | Select when cost sensitivity outweighs thermal margin requirements and JEDEC qualification is not mandatory |
| MMBZ5257BS-7-F | Identical electrical specs, but SOD-323 package (smaller footprint, higher RθJA = 430 °C/W) | Preferred for ultra-dense layouts where board space is constrained, but requires derating above 60°C ambient | Choose for space-constrained consumer wearables where thermal budget allows 100 mW derating at 85°C |
Compared with BZX84-C33-7-F and MMBZ5257BS-7-F, MMBZ5257BQ-7-F provides superior thermal robustness (350 mW/357 °C/W), AEC-Q200-aligned manufacturing, and tighter Zener voltage control-making it optimal for industrial and automotive voltage supervision where long-term stability and supply chain continuity are critical.
Availability
MMBZ5257BQ-7-F is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C port overvoltage protection, and automotive body control module power monitoring requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for MMBZ5257BQ-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, specializing in high-reliability components for industrial, automotive, and computing markets.
The MMBZ52xxB series targets precision voltage reference and circuit protection in space-constrained, high-volume applications-designed specifically for automated SMT assembly and long-lifecycle deployments.
FAQ
What is the Zener voltage tolerance for MMBZ5257BQ-7-F?
The MMBZ5257BQ-7-F has a nominal Zener voltage of 33 V with a guaranteed range of 31.35 V to 34.65 V at IZT = 3.8 mA, representing ±3.5% tolerance. This is measured under JEDEC-standard short-pulse test conditions to minimize self-heating effects and ensure repeatability across production lots.
Is MMBZ5257BQ-7-F qualified for automotive use?
Yes-the "Q" suffix indicates qualification to AEC-Q200 stress testing standards and manufacture in IATF 16949-certified facilities. It supports PPAP documentation and change control required for automotive body electronics, though it is not a full AEC-Q100 active device.
How does thermal derating work for this Zener diode?
Derating begins at +25°C ambient: power dissipation linearly decreases from 350 mW to zero at +150°C, following a slope of −3.5 mW/°C. At +85°C ambient, maximum allowable power drops to 140 mW, calculated as 350 mW × (1 − (85−25)/125).
Can MMBZ5257BQ-7-F replace MMBZ5257B-7-F in existing designs?
Yes-MMBZ5257BQ-7-F is a direct drop-in replacement for MMBZ5257B-7-F, sharing identical electrical specifications, SOT23 package dimensions, and pinout. The "Q" suffix adds AEC-Q200 qualification and IATF 16949 traceability without altering performance or layout.
MMBZ5257BQ-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):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 58 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 25 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-23-3
MMBZ5257BQ-7-F FAQ
1.How can I place an order for MMBZ5257BQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5257BQ-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 MMBZ5257BQ-7-F reliable?
The price and inventory of MMBZ5257BQ-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 MMBZ5257BQ-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5257BQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5257BQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5257BQ-7-F?
MMBZ5257BQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5257BQ-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 MMBZ5257BQ-7-F?
For technical support, including MMBZ5257BQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5257BQ-7-F requirements.
6.How does Aetrix verify that MMBZ5257BQ-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5257BQ-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 MMBZ5257BQ-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5257BQ-7-F?
All MMBZ5257BQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5257BQ-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 MMBZ5257BQ-7-F part is unused and in its original packaging.
Return procedure for MMBZ5257BQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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