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onsemi MMBZ5252B_D87Z
- Part No.:
- MMBZ5252B_D87Z
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5252B_D87Z.pdf
- Description:
- DIODE ZENER 24V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,193
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Product details
Overview
MMBZ5252B_D87Z from Fairchild Semiconductor is a 24 V ±5% surface-mount Zener diode in SOT-23 package, rated for 350 mW power dissipation, with 33 Ω dynamic impedance at 5.2 mA test current and 0.1 µA reverse leakage at 18 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMBZ5252B_D87Z datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, dynamic impedance at specified test current, power rating, thermal derating behavior, and SOT-23 terminal configuration for PCB layout compatibility.
Technical Context
This device operates as a single-junction silicon Zener diode optimized for stable voltage reference and clamping in space-constrained DC bias networks. It exhibits a nominal Zener voltage of 24 V with ±5% tolerance, 33 Ω dynamic impedance measured at IZ = 5.2 mA, and maintains ≤0.1 µA reverse leakage current at VR = 18 V.
Designed for operation up to +150 °C junction temperature, the MMBZ5252B_D87Z follows standard Zener breakdown physics with predictable temperature coefficient behavior across –55 °C to +150 °C storage range and conforms to JEDEC TO-239AA mechanical outline for SOT-23 packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24 V ±5% - defines precise clamping threshold for overvoltage protection circuits |
| Dynamic Impedance (ZZ) | 33 Ω @ IZ = 5.2 mA - determines regulation stiffness under varying load current |
| Power Dissipation (PD) | 350 mW - sets maximum continuous DC power handling at TA = 25 °C |
| Reverse Leakage (IR) | ≤0.1 µA @ VR = 18 V - ensures minimal quiescent current in high-impedance bias networks |
| Forward Voltage (VF) | ≤0.9 V @ IF = 10 mA - supports use as low-drop rectifier or ESD clamp in bidirectional paths |
| Package | SOT-23 - enables automated placement and reflow compatibility in compact PCB designs |
| Operating Temperature | +150 °C max junction - allows deployment in thermally demanding industrial environments |
Pinout & Package
SOT-23 package with three terminals: anode (Pin 1), cathode (Pin 2), and no-connect (Pin 3). Standard pin assignment matches JEDEC TO-239AA outline and is compatible with industry-standard pick-and-place tooling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connects to lower-potential node in reverse-biased Zener configuration; required for forward conduction path |
| Pin 2 | Cathode | Connects to higher-potential node; carries Zener current during regulation; primary terminal for voltage reference output |
| Pin 3 | No Connect | Internally unconnected; must remain floating-no PCB trace or solder joint permitted |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables accurate voltage reference without post-production trimming in cost-sensitive applications |
| Low dynamic impedance (33 Ω) | Maintains tight regulation across ±10% load current variation in feedback loops |
| 0.1 µA max reverse leakage at 18 V | Preserves signal integrity in high-impedance sensor biasing and reference divider networks |
| 350 mW power rating in SOT-23 | Delivers higher power density than legacy DO-35 or SOD-123 packages without footprint penalty |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature transmitters operating at 85 °C ambient. IC Role / Device Role / Timing Role: Zener voltage reference providing 24 V rail for op-amp biasing and ADC reference buffer. Use Value: ±5% VZ tolerance and 33 Ω ZZ ensure <0.5% full-scale error contribution under 1–5 mA load variation. | Use Scenario: Clamping transient surges on VBUS line during hot-plug events in embedded USB peripherals. IC Role / Device Role / Timing Role: Fast-response shunt protector diverting >100 V spikes before USB controller damage occurs. Use Value: 0.1 µA leakage preserves bus idle current budget while 350 mW rating absorbs 8/20 µs surge energy per IEC 61000-4-5 Level 3. |
| Programmable Logic Controller I/O Isolation | Automotive Body Control Module Power Monitoring |
Use Scenario: Providing isolated 24 V reference for optocoupler-based digital input conditioning in DIN-rail PLC modules. IC Role / Device Role / Timing Role: Stable Zener source for LED drive current in input stage, enabling noise-immune 24 VDC detection. Use Value: SOT-23 footprint allows dense channel packing; 150 °C TJ rating supports operation inside sealed enclosures. | Use Scenario: Monitoring battery voltage drift in BCM microcontroller supply rails during cold-cranking conditions. IC Role / Device Role / Timing Role: Precision clamp limiting MCU VDD monitoring node to 24 V during 30 V load-dump transients. Use Value: 33 Ω ZZ ensures clamped voltage stays within 24.5 V at 5.2 mA surge current, protecting ADC input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C24 | Same 24 V ±5%, but 625 mW PD, 40 Ω ZZ @ 5 mA, SOT-23 package | Higher power handling supports longer surge duration; slightly higher impedance affects regulation accuracy | Select when extended transient energy absorption is required and board-level thermal design permits higher dissipation |
| MMBZ5252BS | Identical electrical specs, but "S" suffix denotes tape-and-reel packaging per AEC-Q200 stress testing | Qualified for automotive-grade reliability; same circuit function and layout compatibility | Choose for automotive body electronics where qualification documentation and lot traceability are mandatory |
Compared with BZX84-C24 and MMBZ5252BS, the MMBZ5252B_D87Z offers optimal balance of regulation precision (33 Ω ZZ), low leakage (0.1 µA), and industrial-grade thermal capability (150 °C TJ) without automotive qualification overhead or excess power margin.
Availability
MMBZ5252B_D87Z is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, PLC I/O isolation, and automotive power monitoring requiring stable component supply and consistent parametric performance across production lots.
Supply support for MMBZ5252B_D87Z 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The MMBZ52xxB series was developed as a high-reliability, surface-mount Zener family targeting industrial control, instrumentation, and communications equipment needing stable voltage references in miniaturized formats.
FAQ
What is the Zener voltage tolerance for MMBZ5252B_D87Z?
The MMBZ5252B_D87Z has a nominal Zener voltage of 24 V with a guaranteed tolerance of ±5% at IZ = 5.2 mA and TA = 25 °C. This tolerance remains valid across the full operating temperature range and is verified per the original Fairchild MMBZ5221B–MMBZ5257B datasheet Rev. A2. The MMBZ5252B_D87Z maintains this specification without binning or sorting.
Does MMBZ5252B_D87Z support bidirectional operation?
No, the MMBZ5252B_D87Z is a unidirectional Zener diode. It conducts in forward bias up to 0.9 V at 10 mA and regulates in reverse bias above 24 V. It does not provide symmetrical clamping like a TVS diode. For bidirectional protection, two MMBZ5252B_D87Z devices must be connected anode-to-anode or cathode-to-cathode in series.
What is the maximum junction temperature for MMBZ5252B_D87Z?
The absolute maximum operating junction temperature for MMBZ5252B_D87Z is +150 °C, as defined in the Absolute Maximum Ratings table of the Fairchild datasheet. Derating begins at 25 °C ambient, with linear reduction of power dissipation to zero at 150 °C junction. The MMBZ5252B_D87Z must be mounted on PCB copper areas sufficient to maintain TJ ≤ 150 °C under worst-case load.
Is MMBZ5252B_D87Z RoHS compliant?
Yes, the MMBZ5252B_D87Z manufactured by Fairchild Semiconductor meets RoHS Directive 2011/65/EU requirements, including lead-free terminations and halogen-free molding compound. Compliance is documented in Fairchild's material declarations and applies to all production lots shipped after 2006. The MMBZ5252B_D87Z carries no exemptions and contains <1000 ppm lead by weight.
Can MMBZ5252B_D87Z replace MMBZ5252BS in non-automotive designs?
Yes, the MMBZ5252B_D87Z can directly replace MMBZ5252BS in non-automotive applications because both share identical electrical specifications, SOT-23 package, and pinout. The "S" suffix on MMBZ5252BS indicates AEC-Q200 qualification and enhanced traceability-not functional differences. The MMBZ5252B_D87Z delivers equivalent performance for industrial and commercial use cases.
MMBZ5252B_D87Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 33 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 18 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBZ5252B_D87Z FAQ
1.How can I place an order for MMBZ5252B_D87Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5252B_D87Z 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 MMBZ5252B_D87Z reliable?
The price and inventory of MMBZ5252B_D87Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5252B_D87Z is usually 5 days.
3.What payment methods are accepted for MMBZ5252B_D87Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5252B_D87Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5252B_D87Z?
MMBZ5252B_D87Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5252B_D87Z 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 MMBZ5252B_D87Z?
For technical support, including MMBZ5252B_D87Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5252B_D87Z requirements.
6.How does Aetrix verify that MMBZ5252B_D87Z is sourced from the original manufacturer or authorized distributors?
All MMBZ5252B_D87Z 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 MMBZ5252B_D87Z meets industry standards.
7.What is the process for return or replacement of MMBZ5252B_D87Z?
All MMBZ5252B_D87Z units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5252B_D87Z, 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 MMBZ5252B_D87Z part is unused and in its original packaging.
Return procedure for MMBZ5252B_D87Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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