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Diodes Incorporated MMBZ5237B-7-F
- Part No.:
- MMBZ5237B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5237B-7-F.pdf
- Description:
- DIODE ZENER 8.2V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:29,203
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Product details
Overview
MMBZ5237B-7-F from Diodes Incorporated is a 8.2 V, 350 mW surface-mount Zener diode in SOT23 package, rated for 20 mA test current with 8 Ω dynamic impedance at 1 kHz and ≤3.0 µA reverse leakage at 6.5 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMBZ5237B-7-F datasheet, MMBZ5237B-7-F pinout, MMBZ5237B-7-F application, or MMBZ5237B-7-F equivalent, key selection criteria include 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 breakdown characteristics and low noise performance across production lots.
Designed for operation at 25°C ambient with derating above 25°C per Fig. 1, it delivers regulated output within ±5% of nominal 8.2 V across 0.25–20 mA current range, with specified impedance below 500 Ω up to 1 kHz and thermal shutdown margin defined by RθJA = 357 °C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.2 V nominal, 7.79–8.61 V range at IZT = 20 mA - defines tight regulation window for reference circuits |
| Power Dissipation (PD) | 350 mW on FR-4 PCB - sets maximum continuous power handling without forced cooling |
| Zener Impedance (ZZT) | 8 Ω at f = 1 kHz, IZT = 20 mA - ensures minimal output voltage variation under dynamic load changes |
| Reverse Leakage (IR) | ≤3.0 µA at VR = 6.5 V - guarantees low standby current in battery-powered sensing nodes |
| Thermal Resistance (RθJA) | 357 °C/W - determines junction temperature rise under 350 mW load on standard PCB layout |
| Operating Temperature | −65 °C to +150 °C - supports industrial and automotive under-hood applications |
Pinout & Package
Package: SOT23 - 3-pin surface-mount plastic package with matte tin-plated alloy 42 leadframe, UL 94V-0 rated molding compound, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower potential node during reverse-bias regulation; enables cathode-referenced clamp configuration |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher potential node; carries regulated current into load or shunt path |
| No Connection (Pin 3) | Unused lead | Internally unconnected; must remain floating or grounded per layout guidelines to avoid parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable breakdown voltage distribution and low parametric drift over time and temperature |
| 350 mW dissipation on FR-4 | Enables direct integration into space-constrained PCBs without heatsinking or thermal vias |
| JEDEC-compliant high-reliability qualification | Validates robustness for industrial control and automotive subsystems per AEC-Q200-aligned stress testing |
| Lead-free & halogen-free "Green" packaging | Meets RoHS 3 (2015/863/EU) and automotive PPAP requirements without compromising solderability or long-term reliability |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature transmitters operating from 24 V loop supply. IC Role / Device Role / Timing Role: Zener diode provides precise 8.2 V shunt reference to bias op-amp input stage and set ADC full-scale range. Use Value: Tight 5% VZ tolerance and 8 Ω impedance minimize gain error and code-to-code nonlinearity across −40 °C to +85 °C. |
Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events in portable medical devices. IC Role / Device Role / Timing Role: Acts as fast-acting crowbar element to divert >6.5 V spikes away from USB PHY IC before damage threshold is exceeded. Use Value: Sub-µA leakage at 6.5 V prevents standby current drain; 350 mW rating absorbs 100 ns/1 kV ESD pulses per IEC 61000-4-2 Level 4. |
| Automotive Body Control Module (BCM) | IoT Node Power Rail Supervision |
|
Use Scenario: Providing reset threshold voltage for microcontroller supervisory circuit in 12 V vehicle lighting control unit. IC Role / Device Role / Timing Role: Zener diode forms part of resistor-divider network feeding voltage detector IC that triggers MCU reset below 7.8 V. Use Value: −65 °C to +150 °C operating range and AEC-Q200-aligned qualification ensure function integrity across engine bay thermal cycling. |
Use Scenario: Monitoring Li-ion battery voltage in wireless sensor node to initiate graceful shutdown at 3.0 V system cutoff. IC Role / Device Role / Timing Role: Functions as precision voltage comparator element in discrete supervisor circuit tied to MCU GPIO interrupt pin. Use Value: 3.0 µA max reverse leakage at 6.5 V preserves multi-year battery life; SOT23 footprint minimizes PCB area in coin-cell-powered designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C8V2 (Nexperia) | Same 8.2 V nominal, but 300 mW rating and 15 Ω ZZT; ±5% tolerance; SOT23 package | Lower power and higher impedance limit use in high-accuracy references or high-current clamps | Select when cost sensitivity outweighs need for lowest impedance or highest power margin |
| MMBZ5237BS-7-F (Diodes Inc.) | Same electrical specs, but SOT23-3 (standard) vs. SOT23 (this part); identical marking and thermal performance | No functional difference - alternate packaging variant for legacy board compatibility or internal trace routing preference | Choose based on existing footprint validation; no electrical or reliability trade-offs |
Compared with BZX84-C8V2 and MMBZ5237BS-7-F, MMBZ5237B-7-F offers superior dynamic regulation (8 Ω vs. 15 Ω) and 350 mW headroom for transient absorption, making it preferred for precision analog references and robust ESD protection where thermal margin matters.
Availability
MMBZ5237B-7-F is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, and automotive body control modules requiring stable component supply with full traceability and lifecycle continuity.
Supply support for MMBZ5237B-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 device belongs to the MMBZ52xxB series of 350 mW Zener diodes engineered for high-reliability voltage reference and overvoltage protection in space-constrained, thermally demanding applications including automotive, industrial, and IoT edge nodes.
FAQ
What is the maximum continuous reverse current the MMBZ5237B-7-F can handle at 8.2 V?
The device is rated for 20 mA test current (IZT) at nominal Zener voltage, with absolute maximum power dissipation of 350 mW. At 8.2 V, this corresponds to a maximum continuous reverse current of 42.7 mA - however, sustained operation above 20 mA requires thermal derating per Fig. 1 and may exceed safe junction temperature on standard FR-4 layouts.
Does the MMBZ5237B-7-F meet AEC-Q200 requirements for automotive use?
MMBZ5237B-7-F itself is not AEC-Q200 qualified; however, Diodes Incorporated offers automotive-grade equivalents (e.g., MMBZ5237BQ-7-F) with PPAP capability, manufactured in IATF 16949-certified facilities and tested to AEC-Q200 stress levels. This part meets JEDEC high-reliability standards but lacks formal automotive qualification documentation.
How does the SOT23 pinout differ between MMBZ5237B-7-F and MMBZ5237BS-7-F?
Both parts share identical pin assignment: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = No Connection. The "S" suffix denotes SOT23-3 package variant with identical mechanical dimensions and terminal layout per Diodes' package outline drawings - no functional or pinout difference exists between them.
Can MMBZ5237B-7-F be used in place of a 5.1 V Zener for voltage reference?
No - MMBZ5237B-7-F has a nominal Zener voltage of 8.2 V with ±5% tolerance (7.79–8.61 V), which is incompatible with circuits designed for 5.1 V regulation. Substituting it would cause overvoltage stress on downstream components; use MMBZ5231B-7-F (5.1 V) instead for that voltage level.
MMBZ5237B-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):
- 8.2 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 6.5 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
MMBZ5237B-7-F FAQ
1.How can I place an order for MMBZ5237B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5237B-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 MMBZ5237B-7-F reliable?
The price and inventory of MMBZ5237B-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 MMBZ5237B-7-F is usually 5 days.
3.What payment methods are accepted for MMBZ5237B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5237B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5237B-7-F?
MMBZ5237B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5237B-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 MMBZ5237B-7-F?
For technical support, including MMBZ5237B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5237B-7-F requirements.
6.How does Aetrix verify that MMBZ5237B-7-F is sourced from the original manufacturer or authorized distributors?
All MMBZ5237B-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 MMBZ5237B-7-F meets industry standards.
7.What is the process for return or replacement of MMBZ5237B-7-F?
All MMBZ5237B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5237B-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 MMBZ5237B-7-F part is unused and in its original packaging.
Return procedure for MMBZ5237B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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