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Diodes Incorporated MMBZ5242BT-7-F
- Part No.:
- MMBZ5242BT-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOT-523
- Datasheet:
-
MMBZ5242BT-7-F.pdf
- Description:
- DIODE ZENER 12V 150MW SOT523
- Quantity:
- Payment:
- Shipping:
Inventory:8,135
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Product details
Overview
MMBZ5242BT-7-F from Diodes Incorporated is a 12 V, 150 mW surface-mount Zener diode in SOT-523 package, with nominal Zener voltage 12.0 V (min 11.4 V, max 12.6 V), test current 20 mA, and maximum Zener impedance 30 Ω at IZT; used for precision voltage regulation and overvoltage protection in space-constrained power management circuits.
For engineers reviewing the MMBZ5242BT-7-F datasheet, MMBZ5242BT-7-F pinout, MMBZ5242BT-7-F application, or MMBZ5242BT-7-F equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance at operating current, power derating above 25°C, reverse leakage at rated VR, and SOT-523 thermal resistance (833 °C/W).
Technical Context
This discrete Zener diode employs planar die construction for stable breakdown characteristics and low leakage. It operates within -65°C to +150°C ambient range and delivers regulated 12 V output under reverse-biased conditions with 20 mA test current.
Its 150 mW power rating is thermally limited by an 833 °C/W junction-to-ambient thermal resistance on FR-4 PCBs using recommended pad layout; derating begins linearly above 25°C per Figure 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12.0 V nominal, 11.4–12.6 V range at 20 mA - defines regulation setpoint accuracy for feedback or clamp circuits |
| Power Dissipation (PD) | 150 mW at TA = 25°C - limits continuous clamping energy without heatsinking |
| Zener Impedance (ZZT) | 30 Ω at IZT = 20 mA - determines regulation stiffness under load transients |
| Reverse Leakage (IR) | 1.0 μA at VR = 9.1 V - ensures minimal quiescent current in standby voltage reference paths |
| Thermal Resistance (RθJA) | 833 °C/W - requires careful PCB copper area planning for sustained >50 mW operation |
| Package | SOT-523 - 1.6 mm × 0.8 mm footprint, compatible with high-density automated placement |
Pinout & Package
SOT-523 is a 3-terminal ultra-small plastic package with anode and cathode leads and no case connection. Polarity is marked by a cathode band on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node in reverse-bias regulation configuration |
| Cathode | Zener breakdown terminal / voltage reference output | Provides stable 12 V reference when biased above VZ against anode |
| Case (unconnected) | Non-electrical mechanical support | No internal electrical connection; serves only as thermal and mechanical interface |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SOT-523 footprint | Enables placement in <1.0 mm² board area, critical for wearables and miniaturized IoT sensors |
| Planar die construction | Delivers tight ±5% VZ tolerance and repeatable Zener knee characteristics across production lots |
| 150 mW power rating with 833 °C/W RθJA | Supports self-regulated biasing in low-current analog stages without external thermal relief |
| Lead-free/RoHS-compliant plating | Matte tin finish over Alloy 42 leadframe meets IPC-J-STD-020D Level 1 moisture sensitivity for reflow compatibility |
Applications
| Power Supply Voltage Clamp | Microcontroller I/O Protection |
|---|---|
Use Scenario: Clamping 12 V rail surges in automotive body control modules during load dump events. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector downstream of DC/DC converter. Use Value: Limits transient voltage to ≤12.6 V with <1.0 μA leakage at 9.1 V, preserving downstream logic integrity. | Use Scenario: Protecting 3.3 V GPIO pins of ARM Cortex-M microcontrollers from ESD-induced voltage spikes. IC Role / Device Role / Timing Role: Low-capacitance (<2 pF typical) Zener clamp referenced to ground. Use Value: Provides sub-10 ns response to 8 kV HBM ESD pulses while adding negligible signal loading. |
| Reference Voltage Source | Current-Limited Bias Generator |
Use Scenario: Generating stable 12 V reference for ADC voltage dividers in industrial sensor signal conditioning. IC Role / Device Role / Timing Role: Precision Zener element in two-resistor bias network feeding op-amp input stage. Use Value: Maintains ±0.6 V regulation window over 5–25 mA load variation due to 30 Ω ZZT. | Use Scenario: Biasing constant-current LED driver ICs requiring accurate 12 V enable threshold. IC Role / Device Role / Timing Role: Zener-based threshold detector triggering enable logic at defined VIN. Use Value: Delivers sharp turn-on at 12.0 V with <0.1 V hysteresis, enabling reliable startup sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C12 | Same 12 V nominal, but SOD-523 package (slightly larger), 200 mW rating, 20 Ω ZZT | Higher power handling supports 25 mA continuous; marginally higher capacitance (3.5 pF) | Preferred where board space allows and >150 mW dissipation is required |
| MMSZ5242ET1G | Same 12 V rating, SOD-123 package, 500 mW rating, 30 Ω ZZT, 100 nA IR at 9.1 V | Larger footprint but superior thermal performance (RθJA ≈ 300 °C/W) and lower leakage | Chosen for higher-reliability industrial power rails needing extended lifetime at elevated temperature |
Compared with BZX584-C12 and MMSZ5242ET1G, MMBZ5242BT-7-F offers the smallest PCB footprint and RoHS/Green compliance out-of-box, but trades off power headroom and ultra-low leakage-making it optimal for size-critical, low-power, consumer-grade voltage references.
Availability
MMBZ5242BT-7-F is available at Aetrix Electronics and suitable for power supply clamping, microcontroller I/O protection, precision voltage reference, and current-limited bias generation requiring stable component supply across high-mix, low-volume production runs.
Supply support for MMBZ5242BT-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, serving industrial, computing, communications, and consumer markets with high-reliability components.
The MMBZ52xxBT series belongs to Diodes' general-purpose Zener diode product line, engineered specifically for compact, automated-assembly voltage regulation and protection in portable and space-constrained electronics.
FAQ
What is the maximum reverse leakage current for MMBZ5242BT-7-F at 9.1 V?
The maximum reverse leakage current is 1.0 μA at VR = 9.1 V and TA = 25°C, as specified in the Electrical Characteristics table. This value ensures minimal parasitic loading in high-impedance reference nodes and supports low-quiescent-current designs in battery-powered systems.
Can MMBZ5242BT-7-F be used in place of a 12 V Zener in a 50 mA current-sink application?
No-its 150 mW power rating limits continuous Zener current to approximately 12.5 mA at 12 V (P = V × I). At 50 mA, power dissipation would reach 600 mW, exceeding rating and causing thermal runaway. Use MMSZ5242ET1G (500 mW) or add external series resistance to limit IZ.
Is the SOT-523 package compatible with standard reflow profiles?
Yes-the device meets J-STD-020D Level 1 moisture sensitivity and uses matte tin plating compatible with Pb-free reflow profiles (peak 260°C). No pre-bake is required, and its thermal mass supports uniform heating in standard 8-zone reflow ovens with recommended pad layout per AP02001.
Does MMBZ5242BT-7-F have a specified Zener knee voltage or breakdown sharpness?
While not explicitly labeled "knee voltage," Figure 2 shows typical breakdown onset near 11.2 V at 1 mA, rising to 12.0 V at 20 mA. The 30 Ω ZZT at IZT quantifies dynamic resistance in the regulation region, confirming usable sharpness for precision clamping below 100 mW.
MMBZ5242BT-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 150 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 9.1 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-523
MMBZ5242BT-7-F FAQ
1.How can I place an order for MMBZ5242BT-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5242BT-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 MMBZ5242BT-7-F reliable?
The price and inventory of MMBZ5242BT-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 MMBZ5242BT-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5242BT-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5242BT-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5242BT-7-F?
MMBZ5242BT-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5242BT-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 MMBZ5242BT-7-F?
For technical support, including MMBZ5242BT-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5242BT-7-F requirements.
6.How does Aetrix verify that MMBZ5242BT-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5242BT-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 MMBZ5242BT-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5242BT-7-F?
All MMBZ5242BT-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5242BT-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 MMBZ5242BT-7-F part is unused and in its original packaging.
Return procedure for MMBZ5242BT-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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