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Diodes Incorporated MMBZ5246BQ-7-F
- Part No.:
- MMBZ5246BQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5246BQ-7-F.pdf
- Description:
- DIODE ZENER 16V 350MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:8,591
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Product details
Overview
MMBZ5246BQ-7-F from Diodes Incorporated is a 16V, 350mW surface-mount Zener diode in SOT23 package, rated for 7.8mA test current with 17Ω dynamic impedance at 1kHz and 0.1µA reverse leakage at 12V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMBZ5246BQ-7-F datasheet, MMBZ5246BQ-7-F pinout, MMBZ5246BQ-7-F application, or MMBZ5246BQ-7-F equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (357°C/W), JEDEC-compliant reliability, and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent VZ distribution across production lots, and its 350mW power rating is validated on standard FR-4 PCB with specified pad layout.
The device exhibits 17Ω Zener impedance at IZT = 7.8mA and f = 1kHz, enabling low-noise regulation in feedback paths. Reverse leakage remains ≤0.1µA at VR = 12V, supporting high-impedance sensing nodes and battery-powered systems requiring ultra-low standby current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 16V ±5% (15.2–16.8V range at IZT = 7.8mA; defines regulation setpoint accuracy) |
| Power Dissipation | 350mW on FR-4 PCB (limits continuous current to ~21.9mA at 16V; constrains thermal design) |
| Zener Impedance | 17Ω @ 1kHz, 7.8mA (determines output voltage deviation under load transients) |
| Reverse Leakage | ≤0.1µA @ VR = 12V (enables use in high-Z bias networks without signal degradation) |
| Thermal Resistance | 357°C/W junction-to-ambient (requires derating above +25°C ambient per Fig. 1 curve) |
| Package | SOT23 (3-pin surface-mount; compatible with standard pick-and-place and reflow profiles) |
| Operating Temp | −65°C to +150°C (supports industrial and automotive under-hood environments) |
Pinout & Package
Package: SOT23 - 3-pin plastic molded case with matte tin-plated Alloy 42 leadframe; moisture sensitivity level 1 per J-STD-020; weight ≈ 0.008g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node in reverse-biased regulation configuration |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to regulated voltage rail; carries full Zener current during operation |
| No Connect (Pin 3) | Internal die attach flag | Electrically isolated; serves mechanical anchoring only-must not be soldered to trace |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight VZ distribution (±5%) and long-term stability under thermal cycling |
| 350mW dissipation on FR-4 | Validated with industry-standard pad layout-no custom thermal pads required |
| Lead-free & RoHS 3 compliant | Fully compliant with EU Directive 2015/863/EU; no added lead, bromine, chlorine, or antimony |
| SOT23 footprint | Enables high-density placement and compatibility with automated SMT assembly lines |
| JEDEC High Reliability qualified | Meets AEC-Q stress test requirements for automotive-grade change control readiness |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Clamp |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature/humidity sensor modules. IC Role / Device Role / Timing Role: Zener provides fixed 16V rail for op-amp biasing and ADC reference scaling. Use Value: 17Ω impedance minimizes code shift under supply ripple; 0.1µA leakage avoids loading high-impedance sensor outputs. |
Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events. IC Role / Device Role / Timing Role: Acts as shunt protector-clamps voltage to ≤16.8V before damage threshold of downstream USB PHY. Use Value: Fast response to ESD pulses (per IEC 61000-4-2) enabled by low capacitance and robust 350mW pulse handling. |
| Low-Power IoT Node Voltage Reference | Automotive Cabin Control Panel Regulator |
|
Use Scenario: Generating stable 16V bias for RF transceiver LDO input in battery-operated BLE beacon. IC Role / Device Role / Timing Role: Zener establishes clean intermediate rail upstream of low-noise regulator. Use Value: −65°C to +150°C operating range supports outdoor deployment; 0.1µA leakage extends coin-cell battery life. |
Use Scenario: Regulating microcontroller I/O voltage in HVAC control panel exposed to engine bay thermal gradients. IC Role / Device Role / Timing Role: Provides localized 16V reference for analog sensor interface circuitry. Use Value: JEDEC-qualified reliability and IATF 16949 manufacturing ensure zero-defect field performance in safety-critical cabin systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C16-7-F | Same 16V nominal, but 300mW rating and 40Ω ZZT; SOT23 package with identical pinout | Lower power and higher impedance limit use in higher-current or noise-sensitive regulation | Select when cost sensitivity outweighs need for lowest impedance or highest power margin |
| MMBZ5246BS-7-F | Identical electrical specs, but SOD-323 package (smaller footprint, higher thermal resistance: 430°C/W) | Reduced board area but requires tighter thermal management; unsuitable for >150°C ambient | Choose for space-constrained designs where 350mW derating is acceptable and SOD-323 assembly is supported |
Compared with BZX84-C16-7-F and MMBZ5246BS-7-F, MMBZ5246BQ-7-F delivers superior regulation stability (17Ω vs. 40Ω) and thermal margin (357°C/W vs. 430°C/W), making it optimal for industrial and automotive applications demanding consistent voltage reference under thermal stress.
Availability
MMBZ5246BQ-7-F is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB port overvoltage clamp, and low-power IoT node voltage reference requiring stable component supply, JEDEC-qualified reliability, and SMT-compatible packaging.
Supply support for MMBZ5246BQ-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.
This part belongs to the MMBZ52xxB series of 350mW Zener diodes, engineered specifically for precision voltage reference and overvoltage protection in space-constrained, high-reliability surface-mount applications.
FAQ
What is the maximum continuous Zener current for MMBZ5246BQ-7-F at +70°C ambient?
At +70°C ambient, the power derating curve (Fig. 1) reduces allowable dissipation to ~250mW. With VZ = 16V, max continuous current is 250mW ÷ 16V ≈ 15.6mA. This assumes FR-4 PCB with recommended pad layout and natural convection cooling.
Does MMBZ5246BQ-7-F have automotive qualification?
MMBZ5246BQ-7-F itself is not AEC-Q200 qualified, but Diodes offers the automotive-grade variant MMBZ5246BQ-7-F-A (Q-suffix) manufactured in IATF 16949-certified facilities and PPAP-capable, with full AEC-Q200 stress testing documentation available upon request.
Can Pin 3 of the SOT23 package be grounded or left floating?
Pin 3 is an internal die attach flag with no electrical connection. It must remain electrically floating-neither grounded nor tied to any net-as it serves only mechanical anchoring. Soldering it to a trace may cause mechanical stress or shorting risk due to mold compound variation.
How does the 17Ω Zener impedance affect regulation accuracy under load variation?
A 17Ω impedance means a 1mA change in Zener current causes ~17mV output deviation. For a 5mA load step, regulation error is ~85mV-acceptable for non-critical biasing but insufficient for <10mV precision references, where lower-impedance Zeners or active regulators are preferred.
MMBZ5246BQ-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):
- 16 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 12 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
MMBZ5246BQ-7-F FAQ
1.How can I place an order for MMBZ5246BQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5246BQ-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 MMBZ5246BQ-7-F reliable?
The price and inventory of MMBZ5246BQ-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 MMBZ5246BQ-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5246BQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5246BQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5246BQ-7-F?
MMBZ5246BQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5246BQ-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 MMBZ5246BQ-7-F?
For technical support, including MMBZ5246BQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5246BQ-7-F requirements.
6.How does Aetrix verify that MMBZ5246BQ-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5246BQ-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 MMBZ5246BQ-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5246BQ-7-F?
All MMBZ5246BQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5246BQ-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 MMBZ5246BQ-7-F part is unused and in its original packaging.
Return procedure for MMBZ5246BQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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