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Diodes Incorporated MMSZ5238BS-7
- Part No.:
- MMSZ5238BS-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
MMSZ5238BS-7.pdf
- Description:
- DIODE ZENER 8.7V 200MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,234
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Product details
Overview
MMSZ5238BS-7 from Diodes Incorporated is a surface-mount Zener diode with nominal zener voltage 8.7 V (min 8.27 V, max 9.14 V), 200 mW power dissipation, 8 Ω zener impedance at 20 mA test current, and 3.0 µA reverse leakage at 6.5 V. It is used for precision voltage regulation and reference in low-power analog circuits, including sensor signal conditioning and microcontroller supply rail clamping.
For engineers reviewing the MMSZ5238BS-7 datasheet, MMSZ5238BS-7 pinout, MMSZ5238BS-7 application, or MMSZ5238BS-7 equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (625 °C/W), SOD-323 package compatibility with automated assembly, and compliance with RoHS, halogen-free, and antimony-free "Green" requirements.
Technical Context
This device operates as a two-terminal voltage reference by exploiting controlled reverse breakdown in a planar silicon junction. Its 8.7 V nominal zener voltage is stabilized under 20 mA test current, with low dynamic impedance (8 Ω) ensuring minimal output variation across load changes.
Designed for ambient temperatures from –65 °C to +150 °C, it delivers stable regulation without external biasing or temperature compensation circuitry. The SOD-323 package enables high-density PCB layouts while maintaining thermal performance via 625 °C/W junction-to-ambient resistance on standard FR-4 board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nom) | 8.7 V - precise DC reference point for voltage monitoring or clamping |
| Zener Voltage Range | 8.27 V to 9.14 V - ±5% tolerance ensures predictable regulation window |
| Power Dissipation | 200 mW - supports continuous operation in low-power analog subsystems |
| Zener Impedance | 8 Ω @ 20 mA - low dynamic resistance maintains stable output under varying current |
| Reverse Leakage | 3.0 µA @ 6.5 V - negligible standby current preserves battery life in portable designs |
| Thermal Resistance | 625 °C/W - defines temperature rise per watt on standard FR-4 layout |
| Package | SOD-323 - 1.2–1.4 mm width, 2.3–2.7 mm length, 0.25–0.35 mm height for compact routing |
Pinout & Package
Package: SOD-323 - molded plastic case, UL 94V-0 rated, cathode band marking, 0.004 g weight, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to lower-potential node; reverse-biased configuration places cathode at regulated voltage |
| Cathode | Zener breakdown terminal / regulated output node | Marked with band; supplies stable 8.7 V when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight voltage tolerance and repeatable breakdown characteristics across production lots |
| Lead-free & RoHS-compliant plating | Matte tin finish over Alloy 42 leadframe meets global environmental compliance mandates |
| Halogen- and antimony-free "Green" design | Contains <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - satisfies stringent eco-regulatory requirements |
| Automated assembly compatibility | SOD-323 footprint and solderable terminals support high-yield pick-and-place and reflow processes |
Applications
| Industrial Sensor Interface | Microcontroller I/O Protection |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC inputs in temperature or pressure transducers. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed 8.7 V bias to op-amp gain stages and ADC reference dividers. Use Value: Maintains ±0.2% full-scale accuracy over –40 °C to +85 °C ambient due to low tempco and stable 8 Ω impedance. | Use Scenario: Clamping GPIO pins against ESD-induced overvoltage during field deployment. IC Role / Device Role / Timing Role: Bidirectional transient suppressor-forward conducts at 0.9 V, reverse regulates at 8.7 V. Use Value: Limits pin voltage to safe range below MCU absolute maximum rating (typically 6.5 V), preventing latch-up. |
| Low-Power Battery Monitor | Programmable Logic Supply Clamp |
Use Scenario: Monitoring Li-ion cell voltage in wearables using discrete comparator-based cutoff logic. IC Role / Device Role / Timing Role: Reference element in voltage divider feeding comparator hysteresis network. Use Value: Enables accurate 3.6 V detection threshold with <1% error drift over 500-cycle charge/discharge life. | Use Scenario: Preventing FPGA I/O bank overvoltage during hot-swap or power sequencing faults. IC Role / Device Role / Timing Role: Standby shunt regulator holding VCCIO at defined ceiling during abnormal rail ramp-up. Use Value: Activates at 8.7 V before FPGA damage threshold (typically 9.5 V), limiting energy dissipation to 200 mW. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C8V2 | 8.2 V nominal, ±5% tolerance, 300 mW rating, SOD-323 | Lower voltage; higher power allows greater surge margin but less precise 8.7 V match | Select when system requires tighter thermal derating margin or legacy BOM alignment |
| MMSZ4702T1G | 8.2 V nominal, ±5%, 500 mW, SOD-123 | Larger SOD-123 package; incompatible footprint; higher power dissipation capability | Choose only if board redesign permits larger pad layout and higher power handling is required |
Compared with BZX384-C8V2 and MMSZ4702T1G, MMSZ5238BS-7 provides exact 8.7 V regulation in the industry-standard SOD-323 footprint, balancing precision, size, and thermal performance for space-constrained analog subsystems.
Availability
MMSZ5238BS-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller I/O protection, and low-power battery monitors requiring stable component supply across long-lifecycle embedded programs.
Supply support for MMSZ5238BS-7 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 automotive, industrial, computing, and consumer markets with high-reliability components.
The MMSZ52xxBS series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, high-volume voltage regulation and reference in space-constrained, low-power applications.
FAQ
What is the maximum reverse voltage this Zener can withstand before breakdown?
The MMSZ5238BS-7 exhibits sharp reverse breakdown at its nominal zener voltage of 8.7 V, with guaranteed operation between 8.27 V and 9.14 V at 20 mA test current. It is not rated for sustained reverse voltage above 9.14 V; exceeding this risks irreversible degradation or thermal runaway under unregulated current conditions.
Can this device be used in series or parallel configurations?
Series connection is permissible for higher reference voltages, provided current matching and thermal coupling are managed. Parallel use is strongly discouraged due to mismatched zener impedances (8 Ω typical), which cause current hogging and potential thermal instability-even with matched units from same reel.
Does the SOD-323 package support hand-soldering repair?
Yes-the SOD-323 package is compatible with fine-tip soldering irons and hot-air rework stations. Recommended practices include preheating the board to 100 °C, using flux-core 63/37 solder, limiting iron tip dwell time to <3 seconds per pad, and verifying post-solder cathode band orientation visually and electrically.
How does temperature affect its zener voltage stability?
Over –65 °C to +150 °C, the MMSZ5238BS-7 exhibits a positive temperature coefficient (~+0.05%/°C near 8.7 V), resulting in ~0.44 V total shift across the full range. For precision references, this drift must be compensated in circuit design or mitigated via thermal management in the PCB layout.
MMSZ5238BS-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 8.7 V
- Tolerance:
- ±5%
- Power - Max:
- 200 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:
- SOD-323
MMSZ5238BS-7 FAQ
1.How can I place an order for MMSZ5238BS-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5238BS-7 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 MMSZ5238BS-7 reliable?
The price and inventory of MMSZ5238BS-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5238BS-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5238BS-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5238BS-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5238BS-7?
MMSZ5238BS-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5238BS-7 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 MMSZ5238BS-7?
For technical support, including MMSZ5238BS-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5238BS-7 requirements.
6.How does Aetrix verify that MMSZ5238BS-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5238BS-7 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 MMSZ5238BS-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5238BS-7?
All MMSZ5238BS-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5238BS-7, 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 MMSZ5238BS-7 part is unused and in its original packaging.
Return procedure for MMSZ5238BS-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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