BAS70ZFILM Equivalent & Substitute Parts

Part Overview

The BAS70ZFILM is a Schottky rectifier diode manufactured by STMicroelectronics, rated for 70V DC reverse voltage and 70mA average rectified current in a surface mount SOD-123 package. This component is classified as obsolete product status. Due to its obsolete classification, equivalent and substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for new production and field replacements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	70	V
Current - Average Rectified (Io)	70	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 15 mA	V
Current - Reverse Leakage @ Vr	10	µA @ 70 V
Capacitance @ Vr, F	2	pF @ 0V, 1MHz
Package / Case	SOD-123	—
Operating Temperature - Junction (Max)	150	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BAS70ZFILM is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 70V
Current - Average Rectified (Io): Must equal or exceed 70mA
Package / Case: Must be SOD-123 or SOD-123F (compatible footprint)
Technology: Schottky diode type
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Operational compatibility at specified test conditions
Current - Reverse Leakage @ Vr: Leakage characteristics at rated voltage
Capacitance @ Vr, F: Junction capacitance at specified frequency
Operating Temperature - Junction: Thermal operating range
RoHS and REACH Compliance: Regulatory alignment

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (70V / 70mA or higher): Parts that meet or exceed both voltage and current ratings with matching or superior electrical characteristics.

Category B - Functional Alternatives (70V / Lower Current): Parts that maintain the 70V voltage rating but operate at reduced current ratings. These are suitable for applications where the circuit current demand does not require the full 70mA capability.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	Ir @ Vr [µA/nA]	Capacitance @ Vr [pF]	Package	Product Status
BAS70ZFILM	STMicroelectronics	70	70	1 @ 15 mA	10 µA @ 70 V	2 @ 0V, 1MHz	SOD-123	Obsolete
BAS70H,115	Nexperia USA Inc.	70	70	1 @ 15 mA	10 µA @ 70 V	2 @ 0V, 1MHz	SOD-123F	Active
MMSD701T1G	onsemi	70	200	1 @ 10 mA	200 nA @ 35 V	1 @ 0V, 1MHz	SOD-123	Active
1N5711W-7-F	Diodes Incorporated	70	15	—	—	2 @ 0V, 1MHz	SOD-123	Active
1N6263W-7-F	Diodes Incorporated	60	15	1 @ 15 mA	200 nA @ 50 V	2.2 @ 0V, 1MHz	SOD-123	Active
SD101AW-7-F	Diodes Incorporated	60	15	1 @ 15 mA	200 nA @ 50 V	2 @ 0V, 1MHz	SOD-123	Active
SD101BW-7-F	Diodes Incorporated	50	15	950 mV @ 15 mA	200 nA @ 40 V	2.1 @ 0V, 1MHz	SOD-123	Active
SD101CW-7-F	Diodes Incorporated	40	15	900 mV @ 15 mA	200 nA @ 30 V	2.2 @ 0V, 1MHz	SOD-123	Active

Engineering Selection Recommendations

Recommended Primary Substitute: BAS70H,115

The BAS70H,115 manufactured by Nexperia USA Inc. is the optimal substitute for the obsolete BAS70ZFILM. This part maintains identical electrical specifications: 70V reverse voltage rating, 70mA average rectified current, 1V forward voltage at 15mA, and 10µA reverse leakage at 70V. The package variant is SOD-123F, which is mechanically and electrically compatible with SOD-123 footprints. The part is ROHS3 compliant and carries active product status with 4260 units in stock, ensuring long-term availability. Operating temperature range extends to 150°C maximum junction temperature, matching the original specification.

Recommended Secondary Substitute: MMSD701T1G

The MMSD701T1G manufactured by onsemi provides enhanced current capability at 200mA average rectified current while maintaining the 70V voltage rating. This part is suitable for applications requiring higher current capacity than the original 70mA specification. The SOD-123 package is identical to the original BAS70ZFILM. The part is ROHS3 compliant with active product status and 23300 units in stock. Operating temperature range is -55°C to 125°C. Lower junction capacitance (1pF) and reduced reverse leakage (200nA @ 35V) provide improved high-frequency performance characteristics.

Alternative Substitutes for Reduced Current Applications:

Parts 1N5711W-7-F, 1N6263W-7-F, SD101AW-7-F, SD101BW-7-F, and SD101CW-7-F are suitable only for applications where circuit current requirements do not exceed 15mA. These parts are not recommended as direct replacements for the 70mA-rated BAS70ZFILM in circuits designed for the full current specification. Selection among these alternatives depends on specific voltage requirements: 1N5711W-7-F and 1N5711W-7-F maintain 70V rating; 1N6263W-7-F and SD101AW-7-F provide 60V rating; SD101BW-7-F provides 50V rating; SD101CW-7-F provides 40V rating. All are ROHS3 compliant with active product status.

Frequently Asked Questions (FAQ)

Q: Can the BAS70H,115 be used as a direct replacement for BAS70ZFILM?

A: Yes. The BAS70H,115 is electrically and mechanically equivalent to the BAS70ZFILM. Both parts share identical voltage (70V), current (70mA), forward voltage (1V @ 15mA), and reverse leakage (10µA @ 70V) specifications. The SOD-123F package is compatible with SOD-123 PCB footprints. The primary difference is product status: BAS70H,115 is active while BAS70ZFILM is obsolete.

Q: What is the difference between SOD-123 and SOD-123F packages?

A: SOD-123F is a variant of the SOD-123 package with enhanced mechanical robustness. Both packages are mechanically and electrically compatible for PCB assembly. Parts specified as SOD-123F can be used in applications designed for SOD-123 footprints without modification.

Q: Can MMSD701T1G replace BAS70ZFILM in all applications?

A: MMSD701T1G is suitable for applications where the circuit current requirement does not exceed 200mA. The higher current rating (200mA vs. 70mA) does not create compatibility issues in circuits designed for lower current. However, verify that the application circuit can accommodate the lower junction capacitance (1pF vs. 2pF) and different reverse leakage characteristics (200nA @ 35V vs. 10µA @ 70V) if high-frequency performance is critical.

Q: Why are 1N5711W-7-F and similar low-current parts listed as substitutes?

A: These parts are listed as functional alternatives for applications where circuit current demand is significantly lower than the 70mA BAS70ZFILM specification. They maintain the 70V voltage rating and Schottky technology but are not suitable as direct replacements in circuits designed to operate at 70mA. Use these parts only when circuit analysis confirms that maximum current will not exceed 15mA.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original BAS70ZFILM.

Q: What is the operating temperature range for each substitute?

A: BAS70H,115 operates to 150°C maximum junction temperature, matching the original BAS70ZFILM. MMSD701T1G operates from -55°C to 125°C. Diodes Incorporated parts (1N5711W-7-F, 1N6263W-7-F, SD101AW-7-F, SD101BW-7-F, SD101CW-7-F) operate from -55°C to 125°C or -65°C to 125°C depending on specific part number. Verify temperature range compatibility with application requirements.

Q: Can I use a lower voltage-rated part such as SD101CW-7-F (40V) in place of BAS70ZFILM (70V)?

A: No. Using a lower voltage-rated part in a circuit designed for 70V operation creates risk of diode failure and circuit malfunction. The reverse voltage rating must equal or exceed the maximum reverse voltage present in the application circuit. Select substitute parts with voltage ratings that match or exceed the original specification.

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