My Inquiry
My Account
STMicroelectronics SMM4F26A-TR
- Part No.:
- SMM4F26A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-222AA
- Datasheet:
-
SMM4F26A-TR.pdf
- Description:
- TVS DIODE 26VWM 53.5VC DO222-AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,070
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMM4F26A-TR from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode designed for robust ESD and surge protection in high-reliability power and signal lines. It features a 26 V stand-off voltage (VRM), 42.1 V maximum clamping voltage at 9.0 A (10/1000 µs), 400 W peak pulse power rating, and operates up to 175 °C junction temperature - deployed in automotive body control modules, industrial I/O interfaces, and USB power rails.
For engineers reviewing the SMM4F26A-TR datasheet, SMM4F26A-TR pinout, SMM4F26A-TR application, or SMM4F26A-TR equivalent, key selection criteria include clamping performance under 8/20 µs surges, low leakage (<0.2 µA @ 25 °C), flat STmite Flat package compatibility with high-density PCB layouts, and IEC 61000-4-2 Level 4 compliance (±30 kV contact/air discharge).
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown characteristics and low dynamic resistance (RD = 1.18 Ω) across temperature. Its unidirectional configuration enables integration on DC-biased lines where reverse conduction must be blocked while maintaining fast response to transients.
The device's thermal design supports sustained operation at Tj = 175 °C, delivering up to 160 W pulse power at max junction temperature. Its STmite Flat package (1.90 mm × 3.80 mm × 0.85 mm) ensures low parasitic inductance and compatibility with IPC7531 footprints for optimal surge energy dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 26 V - defines maximum continuous reverse operating voltage before clamping begins |
| Breakdown Voltage (VBR) | 30.0 V min @ 1 mA - ensures reliable triggering above normal operating voltage with margin |
| Clamping Voltage (VCL) | 42.1 V max @ 9.0 A (10/1000 µs) - limits downstream voltage stress during surge events |
| Peak Pulse Power (PPP) | 400 W @ 10/1000 µs - sustains industry-standard lightning-surge energy without failure |
| Leakage Current (IRM) | 0.2 µA @ 25 °C - minimizes standby power loss in battery-powered systems |
| Junction Temperature Range | –55 °C to +175 °C - supports under-hood automotive and industrial ambient conditions |
| ESD Rating | ±30 kV contact/air (IEC 61000-4-2 Level 4) - exceeds system-level immunity requirements |
Pinout & Package
STmite Flat surface-mount package: 2-terminal unidirectional TVS diode in a compact 1.90 mm × 3.80 mm outline with 0.85 mm profile. Cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC return path / surge current sink | Connected to ground or low-impedance return plane to absorb transient energy |
| Cathode | Protected line connection | Connected to input/output line requiring clamping; polarity-sensitive for unidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| Flat STmite package (0.85 mm height) | Enables routing under adjacent components and reduces board space by >30% vs. SMA |
| Low dynamic resistance (1.18 Ω) | Minimizes clamping voltage overshoot during fast-rising 8/20 µs surges |
| High junction temperature capability (175 °C) | Supports placement near heat sources (e.g., power MOSFETs, DC-DC converters) |
| Matte tin lead finish | Ensures solderability and reliability per J-STD-002/JESD22-B102 E3 standards |
| IEC 61000-4-4 immunity (4 kV) | Protects against repetitive electrical fast transients in industrial control environments |
Applications
| Automotive Body Control Module (BCM) | Industrial Digital I/O Interface |
|---|---|
Use Scenario: Protecting LIN bus and sensor supply lines from load dump and ESD in vehicle door modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 12 V rail and ground, triggered within <1 ns of overvoltage event. Use Value: Prevents latch-up or damage to LIN transceivers (e.g., TLE6250) during ±30 kV ESD events and 400 W surges. | Use Scenario: Safeguarding 24 V digital input channels in PLC backplanes exposed to field wiring transients. IC Role / Device Role / Timing Role: Standoff-rated TVS connected in parallel with optocoupler input, clamping to 42.1 V during 8/20 µs surges. Use Value: Maintains functional safety integrity by limiting voltage to <50 V, ensuring isolation barrier remains intact. |
| USB-C Power Delivery (5 V Rail) | Smart Meter Communication Port |
Use Scenario: Surge protection on VBUS line of USB-C receptacles subjected to hot-plug and cable-induced transients. IC Role / Device Role / Timing Role: Unidirectional TVS with 26 V VRM placed after buck converter output, blocking reverse conduction while clamping forward surges. Use Value: Limits VBUS overshoot to ≤42.1 V during 4 kV EFT (IEC 61000-4-4), preventing damage to USB PD controllers. | Use Scenario: Protecting RS-485 transceivers in utility smart meters installed in electrically noisy substations. IC Role / Device Role / Timing Role: TVS diode mounted at connector entry point, shunting surge current away from MAX3485-level transceiver inputs. Use Value: Achieves 30 kV air discharge immunity without derating, enabling direct field deployment without external filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A | Higher clamping voltage (45.4 V @ 8.0 A), SMA package (2.5 mm height), lower PPP (400 W same, but derated faster above 25 °C) | Less suitable for ultra-thin designs; requires more board area and has higher thermal resistance | Select when legacy footprint compatibility is required and height constraint is not critical |
| 1.5SMC26A | Same VRM/VCL specs, but DO-214AB package (4.5 mm height), higher leakage (1 µA @ 25 °C), MSL level 1 still maintained | Not viable for space-constrained portable or automotive modules due to 5.3× height penalty | Choose only for cost-sensitive industrial applications where board real estate is abundant |
Compared with SMAJ26A and 1.5SMC26A, the SMM4F26A-TR delivers identical 26 V standoff and superior thermal performance in a 0.85 mm profile - enabling denser layouts and higher reliability in thermally demanding automotive and industrial edge nodes.
Availability
SMM4F26A-TR is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and smart metering systems requiring stable component supply and long-term manufacturing continuity.
Supply support for SMM4F26A-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power discrete solutions with vertical manufacturing and broad analog/mixed-signal IP.
The SMM4F series belongs to ST's high-reliability TVS portfolio targeting harsh-environment applications - engineered specifically for flat-package ESD/surge protection where low leakage, high Tj, and minimal board footprint are mandatory.
FAQ
What is the maximum surge current the SMM4F26A-TR can handle?
The SMM4F26A-TR withstands up to 9.0 A (10/1000 µs) and 58 A (8/20 µs) peak pulse current, verified per IEC 61000-4-5 waveform definitions. Its 1.18 Ω dynamic resistance ensures clamping stays within 42.1 V at 9.0 A, making it suitable for Level 4 ESD and moderate lightning-surge scenarios in 24 V systems.
Does the SMM4F26A-TR require a heatsink for continuous operation?
No heatsink is required. The device is rated for continuous operation up to 175 °C junction temperature, and its STmite Flat package achieves Rth(j-a) ≈ 2.5 °C/W on a 2 cm² copper pad - sufficient for transient-only duty cycles typical of TVS applications. Thermal derating curves confirm 160 W capability at Tj = 175 °C.
How does the marking "4UN" correspond to SMM4F26A-TR?
"4UN" is the top-side laser marking per ST's ordering scheme: "4U" denotes the SMM4FxxA family, and "N" maps uniquely to the 26 V variant. This marking appears on the cathode-end of the STmite Flat package and aligns with Table 6 in DS5630 Rev 6 - used for automated optical inspection and traceability in SMT lines.
Can SMM4F26A-TR replace bidirectional TVS diodes in AC-coupled circuits?
No. As a unidirectional device, SMM4F26A-TR conducts only in reverse bias and blocks forward current - unsuitable for AC lines or differential pairs requiring symmetrical clamping. For such use cases, ST's SMBJ26CA or SMCJ26CA (bidirectional variants) must be selected instead to avoid forward conduction damage.
SMM4F26A-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-222AA
- Series:
- SMM4F, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 26V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 53.5V
- Current - Peak Pulse (10/1000µs):
- 43A (8/20µs)
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO222-AA
SMM4F26A-TR FAQ
1.How can I place an order for SMM4F26A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMM4F26A-TR 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 SMM4F26A-TR reliable?
The price and inventory of SMM4F26A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMM4F26A-TR is usually 5 days.
3.What payment methods are accepted for SMM4F26A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMM4F26A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMM4F26A-TR?
SMM4F26A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMM4F26A-TR 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 SMM4F26A-TR?
For technical support, including SMM4F26A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMM4F26A-TR requirements.
6.How does Aetrix verify that SMM4F26A-TR is sourced from the original manufacturer or authorized distributors?
All SMM4F26A-TR 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 SMM4F26A-TR meets industry standards.
7.What is the process for return or replacement of SMM4F26A-TR?
All SMM4F26A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMM4F26A-TR, 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 SMM4F26A-TR part is unused and in its original packaging.
Return procedure for SMM4F26A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMM4F26A-TR Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
